1087 lines
33 KiB
XML
1087 lines
33 KiB
XML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<svg viewBox="-200 -150 400 300" version="1.1" xmlns="http://www.w3.org/2000/svg">
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<!-- <svg viewBox="-10 -10 100 100" version="1.1" xmlns="http://www.w3.org/2000/svg"> -->
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<style>
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foreignObject {
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font-size: 4pt;
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font-family: courier;
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color: white;
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}
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#info {
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position: absolute;
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right: 0px;
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padding: 1px;
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}
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#pointer {
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position: absolute;
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right: 0px;
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bottom: 0px;
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padding: 1px;
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}
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rect#bg {
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fill: gray;
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}
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.ship circle {
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fill: white;
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}
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circle.bullet {
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fill: yellow;
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}
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#triangles polygon {
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fill-opacity: 0.2;
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stroke-width: 1px;
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fill: none;
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stroke: none;
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}
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#triangles polygon.clockwise-orientation {
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fill: white;
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stroke: red;
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}
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#triangles polygon.obtuse {
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stroke: orangered;
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stroke-dasharray: 5 10;
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}
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#triangles polygon.anti-clockwise {
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stroke: orange;
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stroke-dasharray: 1 5;
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}
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#edges line {
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stroke: gold;
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}
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#legs {
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display: none;
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}
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.wall {
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opacity: 0.5;
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}
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.wall.inverse {
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fill: gray;
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}
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line:not(#cannon) {
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stroke-width: 0.5px;
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}
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line#velocity-indicator {
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stroke: blue;
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/* stroke-width: 1px; */
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}
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line#acceleration-indicator {
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stroke: maroon;
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/* stroke-width: 0.5px; */
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}
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#lines circle {
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fill: purple;
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opacity: 0.2;
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r: 5px;
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}
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</style>
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<rect id="bg" x="-200" y="-150" width="400" height="300"/>
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<!-- <polygon class="wall inverse" points="-180,-40 -170,-120 40,-130 170,-120 180,40 170,130 -40,130 -170,120" /> -->
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<!-- <polygon class="wall inverse" points="-160,-40 -170,-120 40,-110 170,-120 160,40 170,130 -40,110 -170,120" /> -->
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<g id="player" class="ship">
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<line id="cannon" x1="0" y1="0" x2="0" y2="8" stroke="black"/>
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<circle id="body" cx="0" cy="0" r="5"/>
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<line id="velocity-indicator" x1="0" y1="0" x2="0" y2="0"/>
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<line id="acceleration-indicator" x1="0" y1="0" x2="0" y2="0"/>
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<g id="legs">
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<path d="M 3 2 l 2 2 v 2 m -2 0 h 4" stroke="black" fill="none" />
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<path d="M -3 2 l -2 2 v 2 m -2 0 h 4" stroke="black" fill="none" />
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</g>
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</g>
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<!-- <polygon class="wall" points="20,20 30,20 40,40 20,40" /> -->
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<!-- <polygon class="wall" points="20,20 50,20 70,40 70,70 50,90 20,90 0,70 0,40" /> -->
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<!-- <polygon class="wall" points="-10,-10 -20,-10 -20,-20 -10,-20" /> -->
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<!-- <polygon class="wall" points="-50,-50 -60,-50 -60,-60 -50,-60" /> -->
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<!-- <polygon class="wall" points="10,-50 3,-50 3,-60 10,-60" /> -->
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<!-- <polygon class="wall" points="-10,50 -3,50 -3,60 -10,60" /> -->
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<!-- <polygon class="wall" points="20,-50 10,-50 10,-60 20,-60" /> -->
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<!-- <polygon class="wall" points="-20,50 -10,50 -10,60 -20,60" /> -->
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<!-- <polygon class="wall" points="-20,-50 -10,-50 -10,-60 -20,-60" /> -->
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<!-- <polygon class="wall" points="20,50 10,50 10,60 20,60" /> -->
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<!-- <polygon class="wall" points="-100,-50 -10,-50 -10,-60 -100,-60" /> -->
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<!-- <polygon class="wall" points="-100,-60 -10,-60 -10,-50 -100,-50" /> -->
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<!-- <polygon class="wall" points="10,50 100,50 100,60 10,60" /> -->
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<!-- <polygon class="wall" points="34,56 56,78 45,98 23,89" /> -->
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<polygon class="wall" points="44,55 55,66 33,88 22,66" />
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<polygon class="wall" points="-55,-44 -33,-33 -55,-22 -66,-33" />
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<polygon class="wall" points="77,-22 133,-6 99,0 88,-5" />
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<polygon class="wall" points="-77,99 -66,88 -44,122 -88,133" />
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<polygon class="wall" points="-99,44 -77,44 -88,55" />
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<!-- <polygon class="wall" points="-50,50 -40,60 -50,70 -60,60" /> -->
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<!-- <polygon class="wall" points="50,-30 40,-60 50,-70 60,-60" /> -->
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<!-- <polygon class="wall" points="50,50 60,60 50,70 40,60" /> -->
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<!-- <polygon class="wall" points="-50,-50 -60,-60 -50,-70 -40,-60" /> -->
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<!-- <polygon class="wall" points="-10,20 10,10 10,20" /> -->
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<!-- <polygon class="wall" points="20,20 40,20 40,40 20,40" /> -->
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<!-- <polygon class="wall" points="10,10 20,10 20,20 10,20" /> -->
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<!-- <polygon class="wall" points="20,-50 -50,-50 -60,-70 -50,-100 80,-100 80,-90 -20,-90 -20,-60 40,-60 40,40 20,40" /> -->
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<!-- <polygon class="wall" points="-10,-30 -10,-40 30,-50 60,-30 80,0 150,0 150,10 60,50 -10,40 -20,20 20,20 20,-20" /> -->
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<!-- <g> -->
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<!-- <polygon class="wall" points="-130,-80 -40,-70 -70,-10" /> -->
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<!-- <polygon class="wall" points="50,70 90,-10 130,70" /> -->
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<!-- </g> -->
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<!-- <g> -->
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<!-- <polygon class="wall" points="-130,-80 -40,-70 -70,-10" /> -->
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<!-- <polygon class="wall" points="50,70 90,-10 130,70" /> -->
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<!-- <polygon class="wall" points="-130,100 -70,50 -40,110" /> -->
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<!-- </g> -->
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<!-- <g> -->
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<!-- <polygon class="wall" points="-5,-25 -20,-40 20,-40 5,-25" /> -->
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<!-- <polygon class="wall" points="-30,20 -20,30 -20,50 -50,20" /> -->
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<!-- <polygon class="wall" points="20,30 30,20 50,20 20,50" /> -->
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<!-- </g> -->
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<g id="triangles"></g>
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<g id="edges"></g>
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<g id="lines"></g>
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<g id="bullets"></g>
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<foreignObject x="-200" y="-150" width="100%" height="100%">
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<div id="info" xmlns="http://www.w3.org/1999/xhtml">
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<span id="time" xmlns="http://www.w3.org/1999/xhtml">0</span> s
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<span id="fps" xmlns="http://www.w3.org/1999/xhtml">-</span> fps
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</div>
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<ul xmlns="http://www.w3.org/1999/xhtml">
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<li xmlns="http://www.w3.org/1999/xhtml">bounce from collisions</li>
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<li xmlns="http://www.w3.org/1999/xhtml">gravity</li>
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<li xmlns="http://www.w3.org/1999/xhtml">fall off screen after crash</li>
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<li xmlns="http://www.w3.org/1999/xhtml">make ship a helicopter</li>
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<li xmlns="http://www.w3.org/1999/xhtml">use paths for walls</li>
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<li xmlns="http://www.w3.org/1999/xhtml">no walls</li>
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<li xmlns="http://www.w3.org/1999/xhtml">stop reading data from elements</li>
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<li xmlns="http://www.w3.org/1999/xhtml">ability to land</li>
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<li xmlns="http://www.w3.org/1999/xhtml">limited fuel</li>
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<li xmlns="http://www.w3.org/1999/xhtml">additional cannon firing modes</li>
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<li xmlns="http://www.w3.org/1999/xhtml">only light up the collided wall</li>
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<li xmlns="http://www.w3.org/1999/xhtml">keep ship position at 0,0 actual</li>
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<li xmlns="http://www.w3.org/1999/xhtml">only start on movement not just any keypress</li>
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</ul>
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<pre id="debug" xmlns="http://www.w3.org/1999/xhtml"></pre>
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<div id="pointer" xmlns="http://www.w3.org/1999/xhtml">
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x: <span class="x" xmlns="http://www.w3.org/1999/xhtml">-</span>,
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y: <span class="y" xmlns="http://www.w3.org/1999/xhtml">-</span>
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</div>
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</foreignObject>
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<script type="text/javascript">//<![CDATA[
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// entities
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// const Ships = [{ entity_id: "ship_1" }];
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// const Walls = [{ entity_id: "wall_1" }, { entity_id: "wall_2" }];
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// systems
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// Move.update = ({ entity_id }) => {
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// reads Velocity[entity_id]
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// sets Position[entity_id]
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// };
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// components
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// Velocity = { "ship_1": { x: 0, y: 0 }};
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// Position = { "ship_1": { x: 0, y: 0 }};
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// Points = {
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// "wall_1": "0,0 2,0 1,1",
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// "wall_2": "0,0 -1,1 -2,0",
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// };
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const namespaceURIsvg = 'http://www.w3.org/2000/svg';
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const degsRegex = /(-?\d*\.{0,1}\d+)deg/g;
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const regex = /(-?\d*\.{0,1}\d+)px/g;
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const bullets = [];
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const halfPi = Math.PI / 2;
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const maxSpeed = 100;
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const drawCollisionLines = false;
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let previous, zero, frameCount = 0;
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let rotate = 0;
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let mult = 10000;
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const ship = document.querySelector(".ship");
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const s = { node: ship };
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let friction = 0;
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let rotationSpeed = 0.25;
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let started = false;
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let restart = false;
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let isReadingKeys = true;
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const svg = document.querySelector('svg');
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const bg = svg.querySelector('#bg');
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const fps = document.querySelector("#fps");
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const time = document.querySelector("#time");
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const debug = document.querySelector("#debug");
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const gun = ship.querySelector('#cannon');
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const shipBody = ship.querySelector("#body");
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const shipRadius = +shipBody.getAttribute('r');
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const legs = ship.querySelector("#legs");
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const wallElements = document.querySelectorAll('.wall');
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const bulletsContainer = document.querySelector("#bullets");
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const triangleContainer = document.querySelector('#triangles');
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const linesContainer = document.querySelector("#lines");
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const edgeContainer = document.querySelector('#edges');
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const velIndic = document.querySelector('#velocity-indicator');
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const acclIndic = document.querySelector('#acceleration-indicator');
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const bulletPt = svg.createSVGPoint();
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const cornerPt = svg.createSVGPoint();
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const map = (function(els) {
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let corners, edges;
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return {
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walls: [...els].map(node => {
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const corners = node.getAttribute('points').split(' ').map(coords => {
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const [x, y] = coords.split(',');
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const pt = svg.createSVGPoint();
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pt.x = +x;
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pt.y = +y;
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return pt;
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});
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const edges = corners.map(({ x: xa, y: ya }, i, arr) => {
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const { x: xb, y: yb } = arr[(i + 1) % arr.length];
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return { xa: xa, ya: ya, xb: xb, yb: yb };
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});
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return { node, corners, edges };
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}),
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get corners() {
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if (corners) return corners;
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return this.walls.reduce((acc, wall) =>
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[...acc, ...wall.corners.map(c => ({ corner: c, wall: wall }))], []);
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},
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get edges() {
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if (edges) return edges;
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return this.walls.reduce((acc, wall) =>
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[...acc, ...wall.edges.map(e => ({ edge: e, wall: wall }))], []);
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}
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};
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})(wallElements);
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let allStartingEdges;
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init();
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const b = map.edges.map(({ edge }) => getEdgeCollisionBoundary(edge, shipRadius));
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b.forEach(b => drawLine(b.xa, b.ya, b.xb, b.yb, "orange"));
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function distance(x1, y1, x2, y2) {
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return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
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}
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function drawTriangles(container, walls, [positionX, positionY]) {
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walls.forEach(pts =>
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pts.forEach(([[x1, y1], [x2, y2]]) => {
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const el = document.createElementNS(namespaceURIsvg, 'polygon');
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const attr = `${x1},${y1} ${x2},${y2} ${positionX},${positionY}`
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el.setAttribute('points', attr);
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container.appendChild(el);
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})
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);
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}
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// Triangle has a clockwise orientation
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function isClockwise([xa, ya], [xb, yb], [xc, yc]) {
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// https://en.wikipedia.org/wiki/Curve_orientation#Practical_considerations
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// Determinant for a convex polygon
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const det = (+xb - +xa) * (+yc - +ya) - (+xc - +xa) * (+yb - +ya);
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return det < 0;
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}
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function isAcute([xa, ya], [xb, yb], [xc, yc]) {
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const da = distance(xa, ya, xc, yc);
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const db = distance(xb, yb, xc, yc);
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const dc = distance(xa, ya, xb, yb);
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// https://en.wikipedia.org/wiki/Law_of_cosines
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// Solve for angles alpha and beta with inverse cosine (arccosine)
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const alpha = Math.acos((db ** 2 + dc ** 2 - da ** 2) / (2 * db * dc));
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const beta = Math.acos((da ** 2 + dc ** 2 - db ** 2) / (2 * da * dc));
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return alpha < halfPi && beta < halfPi;
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}
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function getForwardEdges(edges, { x, y }) {
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return edges.filter(({ edge }) => {
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const { xa, ya, xb, yb } = edge;
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const det = (xb - xa) * (y - ya) - (x - xa) * (yb - ya);
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return det < 0;
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});
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}
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function getForwardCorners(corners, position, velocity) {
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const { x: x1, y: y1 } = position;
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const { x: x2, y: y2 } = velocity;
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const { x: vx, y: vy } = velocity;
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let perppts = {};
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if (vx === 0 && vy === 0) {
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// none
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} else if (vx === 0 && vy > 0) {
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perppts = { a: { x: x1 - 1, y: y1 }, b: { x: x1 + 1, y: y1 }};
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} else if (vx === 0 && vy < 0) {
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perppts = { a: { x: x1 + 1, y: y1 }, b: { x: x1 - 1, y: y1 }};
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} else if (vy === 0 && vx > 0) {
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perppts = { a: { x: x1, y: y1 + 1 }, b: { x: x1, y: y1 - 1 }};
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} else if (vy === 0 && vx < 0) {
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perppts = { a: { x: x1, y: y1 - 1 }, b: { x: x1, y: y1 + 1 }};
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} else if (vy > 0 && vx > 0) {
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const vslope = vy / vx;
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const pslope = 1 / -vslope;
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// Point-slope line equation
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const pya = pslope * (x1 - 1) - pslope * x1 + y1;
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const pyb = pslope * (x1 + 1) - pslope * x1 + y1;
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perppts = { a: { x: x1 - 1, y: pya }, b: { x: x1 + 1, y: pyb }};
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} else if (vy > 0 && vx < 0) {
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const vslope = vy / vx;
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const pslope = 1 / -vslope;
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const pya = pslope * (x1 - 1) - pslope * x1 + y1;
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const pyb = pslope * (x1 + 1) - pslope * x1 + y1;
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perppts = { a: { x: x1 - 1, y: pya }, b: { x: x1 + 1, y: pyb }};
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} else if (vy < 0 && vx > 0) {
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const vslope = vy / vx;
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const pslope = 1 / -vslope;
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const pya = pslope * (x1 + 1) - pslope * x1 + y1;
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const pyb = pslope * (x1 - 1) - pslope * x1 + y1;
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perppts = { a: { x: x1 + 1, y: pya }, b: { x: x1 - 1, y: pyb }};
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} else if (vy < 0 && vx < 0) {
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const vslope = vy / vx;
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const pslope = 1 / -vslope;
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const pya = pslope * (x1 + 1) - pslope * x1 + y1;
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const pyb = pslope * (x1 - 1) - pslope * x1 + y1;
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perppts = { a: { x: x1 + 1, y: pya }, b: { x: x1 - 1, y: pyb }};
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} else {
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//
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}
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const { a, b } = perppts;
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// if (a && b) drawLine(a.x, a.y, b.x, b.y);
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return corners.filter(({ corner: c }) => {
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if (!a || !b) return;
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const det = (b.x - a.x) * (c.y - a.y) - (b.y - a.y) * (c.x - a.x);
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return det > 0;
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});
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}
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function updateTriangles([positionX, positionY]) {
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const delim = ' ';
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const className = 'clockwise-orientation';
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// if (!triangleContainer.childElementCount)
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// drawTriangles(triangleContainer, allEdgePts, position);
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const triangles = triangleContainer.querySelectorAll('polygon');
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triangles.forEach(t => {
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const attr = t.getAttribute('points').split(delim);
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const [a, b,] = attr.map(t => t.split(','));
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const cw = isClockwise(a, b, [positionX, positionY]);
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const acute = isAcute(a, b, [positionX, positionY]);
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const pos = `${positionX},${positionY}`;
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if (pos !== attr.pop()) {
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attr.push(pos);
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t.setAttribute('points', attr.join(delim));
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}
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t.classList[cw && acute ? "add" : "remove"](className);
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t.classList[cw && !acute ? "add" : "remove"]("obtuse");
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t.classList[!cw ? "add" : "remove"]("anti-clockwise");
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});
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}
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function wrapPos(positionX, positionY) {
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let x, y;
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|
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if (positionY > 150) y = positionY - 300;
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else if (positionY < -150) y = positionY + 300;
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|
else y = positionY;
|
|
|
|
if (positionX > 200) x = positionX - 400;
|
|
else if (positionX < -200) x = positionX + 400;
|
|
else x = positionX;
|
|
|
|
return [x, y];
|
|
}
|
|
|
|
function fireBullet(position, velocity) {
|
|
const speed = 200; // meters per second
|
|
const degrees = getRotate(gun);
|
|
const radians = degrees * Math.PI / 180; // toFixed(15)?
|
|
const vx = -Math.sin(radians);
|
|
const vy = Math.cos(radians);
|
|
const bulletTimeout = 5000; // miliseconds
|
|
const cannonLength = 8;
|
|
|
|
const el = document.createElementNS(namespaceURIsvg, 'circle');
|
|
el.classList.add('bullet');
|
|
el.setAttribute('r', 1);
|
|
el.setAttribute('cx', 0);
|
|
el.setAttribute('cy', 0);
|
|
|
|
const bullet = {
|
|
x: position.x + vx * cannonLength,
|
|
y: position.y + vy * cannonLength,
|
|
vx: vx * speed + velocity.x,
|
|
vy: vy * speed + velocity.y,
|
|
time: bulletTimeout,
|
|
node: bulletsContainer.appendChild(el)
|
|
}
|
|
|
|
bullets.push(bullet);
|
|
}
|
|
|
|
function getRotate(el) {
|
|
let [[, degrees] = ["0deg", "0"]] = [...el.style.transform.matchAll(degsRegex)];
|
|
return +degrees;
|
|
}
|
|
|
|
function updateBullets(elapsed) {
|
|
const deleteCount = 1;
|
|
|
|
[...bullets].forEach((bullet, index) => {
|
|
bullet.time -= elapsed;
|
|
const x = bullet.x + 0.001 * elapsed * bullet.vx;
|
|
const y = bullet.y + 0.001 * elapsed * bullet.vy;
|
|
bulletPt.x = x;
|
|
bulletPt.y = y;
|
|
|
|
if (bullet.time > 0 && ![...wallElements].some(w => w.isPointInFill(bulletPt))) {
|
|
[bullet.x, bullet.y] = wrapPos(x, y);
|
|
bullet.node.style.transform = `translate(${bullet.x}px, ${bullet.y}px)`;
|
|
} else {
|
|
bullet.node.remove();
|
|
bullets.splice(index, deleteCount);
|
|
}
|
|
});
|
|
}
|
|
|
|
function perpIntxn(baseSlope, xa, ya, xc, yc) {
|
|
let isx, isy;
|
|
|
|
// base is vertical
|
|
if (baseSlope === -Infinity || baseSlope === Infinity) {
|
|
isx = xa;
|
|
isy = yc;
|
|
} else if (baseSlope === 0) { // base is horizontal
|
|
isx = xc;
|
|
isy = ya;
|
|
} else {
|
|
const altitudeSlope = 1 / -baseSlope;
|
|
isx = (-altitudeSlope * xc + yc + baseSlope * xa - ya) / (baseSlope - altitudeSlope);
|
|
isy = altitudeSlope * isx - altitudeSlope * xc + yc;
|
|
}
|
|
|
|
return { x: isx, y: isy };
|
|
}
|
|
|
|
function drawLine(xa, ya, xb, yb, color = "black") {
|
|
const el = document.createElementNS(namespaceURIsvg, 'line');
|
|
el.setAttribute('x1', xa);
|
|
el.setAttribute('y1', ya);
|
|
el.setAttribute('x2', xb);
|
|
el.setAttribute('y2', yb);
|
|
el.setAttribute('stroke', color);
|
|
svg.appendChild(el);
|
|
return el;
|
|
}
|
|
|
|
function drawCircle(cx, cy, color = "black", r = 1) {
|
|
const el = document.createElementNS(namespaceURIsvg, 'circle');
|
|
el.setAttribute('cx', cx);
|
|
el.setAttribute('cy', cy);
|
|
el.setAttribute('r', r);
|
|
el.setAttribute('fill', color);
|
|
svg.appendChild(el);
|
|
return el;
|
|
}
|
|
|
|
function slope({ xa, ya, xb, yb }) {
|
|
return (yb - ya) / (xb - xa);
|
|
}
|
|
|
|
function isLandable(edge) {
|
|
// console.log("edge", edge, "slope", slope(edge));
|
|
return edge.xa < edge.xb && edge.ya === edge.yb;
|
|
// return Object.is(slope(edge), +0);
|
|
}
|
|
|
|
function getEdgeCollisionBoundary(edge, dist) {
|
|
const { xa, ya, xb, yb } = edge;
|
|
const length = distance(xa, ya, xb, yb);
|
|
const rise = yb - ya;
|
|
const run = xb - xa;
|
|
|
|
const riol = rise / length * dist;
|
|
const ruol = run / length * dist;
|
|
|
|
return { xa: xa + riol, ya: ya - ruol, xb: xb + riol, yb: yb - ruol};
|
|
}
|
|
|
|
function detectEdgeCollision([xc, yc], [x, y], radius, gearDown = false) {
|
|
return ({ edge, wall }) => {
|
|
if (xc === x && yc === y) return;
|
|
|
|
const dist = edge.x3 < edge.x4 && edge.y3 === edge.y4 && gearDown ? radius + 2 : radius;
|
|
const edgeSeg = getEdgeCollisionBoundary(edge, dist);
|
|
const positionSeg = { xa: x, ya: y, xb: xc, yb: yc };
|
|
|
|
let { xa: x1, ya: y1, xb: x2, yb: y2 } = positionSeg;
|
|
let { xa: x3, ya: y3, xb: x4, yb: y4 } = edgeSeg;
|
|
|
|
// https://en.wikipedia.org/wiki/Intersection_(geometry)#Two_line_segments
|
|
// https://en.wikipedia.org/wiki/Cramer%27s_rule#Explicit_formulas_for_small_systems
|
|
const s = ((x3-x1)*(y4-y3)-(x4-x3)*(y3-y1))/((x2-x1)*(y4-y3)-(x4-x3)*(y2-y1));
|
|
const t = -((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1))/((x2-x1)*(y4-y3)-(x4-x3)*(y2-y1));
|
|
const roundedT = +t.toFixed(2);
|
|
const roundedS = +s.toFixed(2);
|
|
|
|
// if (roundedS >= 0 && roundedS <= 1 && roundedT >= 0 && roundedT <= 1) {
|
|
// const xs = (x1 + s * (x2 - x1));
|
|
// const ys = (y1 + s * (y2 - y1));
|
|
// const xt = (x3 + t * (x4 - x3));
|
|
// const yt = (y3 + t * (y4 - y3));
|
|
// const collisionPt = [xs, ys];
|
|
// // [xs, ys] === [xt, yt];
|
|
// drawCircle(...collisionPt, "red"); // collision position
|
|
// }
|
|
|
|
return roundedS >= 0 && roundedS <= 1 && roundedT >= 0 && roundedT <= 1;
|
|
};
|
|
}
|
|
|
|
function detectCornerCollision([xc, yc], [x, y], radius) {
|
|
return c => {
|
|
if (xc === x && yc === y) return;
|
|
|
|
const d = distance(c.corner.x, c.corner.y, xc, yc);
|
|
|
|
if (d <= radius) return true;
|
|
|
|
const positionSeg = { xa: xc, ya: yc, xb: x, yb: y };
|
|
const posNormIntxn = perpIntxn(slope(positionSeg), x, y, c.corner.x, c.corner.y);
|
|
const cornerSeg = { xa: c.corner.x, ya: c.corner.y, xb: posNormIntxn.x, yb: posNormIntxn.y };
|
|
|
|
const { x: x0, y: y0 } = c.corner;
|
|
const { xa: x1, ya: y1, xb: x2, yb: y2 } = positionSeg;
|
|
const { xa: x3, ya: y3, xb: x4, yb: y4 } = cornerSeg;
|
|
|
|
// https://en.wikipedia.org/wiki/Intersection_(geometry)#Two_line_segments
|
|
// https://en.wikipedia.org/wiki/Cramer%27s_rule#Explicit_formulas_for_small_systems
|
|
const s = ((x3-x1)*(y4-y3)-(x4-x3)*(y3-y1))/((x2-x1)*(y4-y3)-(x4-x3)*(y2-y1));
|
|
const t = -((x2-x1)*(y3-y1)-(x3-x1)*(y2-y1))/((x2-x1)*(y4-y3)-(x4-x3)*(y2-y1));
|
|
const roundedT = +t.toFixed(2);
|
|
|
|
if (s >= 0 && roundedT <= 1) {
|
|
const xs = (x1 + s * (x2 - x1));
|
|
const ys = (y1 + s * (y2 - y1));
|
|
const xt = (x3 + roundedT * (x4 - x3));
|
|
const yt = (y3 + roundedT * (y4 - y3));
|
|
// [xs, ys] and [xt, yt] should be equal ([xs, ys] === [xy, yt])
|
|
// (...or about equal, notwithstanding rounding errors)
|
|
const sCollisionPt = [xs, ys];
|
|
const tCollisionPt = [xt, yt];
|
|
// drawCircle(posNormIntxn.x, posNormIntxn.y, "red");
|
|
// drawCircle(...tCollisionPt, "blue");
|
|
}
|
|
|
|
return s >= 0 && roundedT <= 1;
|
|
};
|
|
}
|
|
|
|
function detectCollision(currentPos, intendedPos, velocity, radius, { edges, corners }, gearDown) {
|
|
const { x: xc, y: yc } = intendedPos;
|
|
const [x, y] = currentPos;
|
|
// edges oriented clockwise with ship
|
|
const fwdEdges = getForwardEdges(edges, { x, y })
|
|
const edgeColl = fwdEdges.find(detectEdgeCollision([xc, yc], [x, y], radius, gearDown));
|
|
|
|
if (edgeColl) return edgeColl;
|
|
|
|
// corners ahead of ship
|
|
const fwdCorners = getForwardCorners(corners, { x, y }, velocity);
|
|
const cornersInPath = fwdCorners.filter(withinCollisionDistance({ x, y }, velocity, radius));
|
|
const cornerColl = cornersInPath.find(detectCornerCollision([xc, yc], [x, y], radius));
|
|
|
|
if (cornerColl) return cornerColl;
|
|
}
|
|
|
|
function withinCollisionDistance({ x: x1, y: y1 }, { x: x2, y: y2 }, distance) {
|
|
const diffx = x2;
|
|
const diffy = y2;
|
|
const detv = x2 * y1 - y2 * x1;
|
|
const dv = Math.sqrt(diffy ** 2 + diffx ** 2);
|
|
const slopev = slope({ xa: x1, ya: y1, xb: x1 + x2, yb: y1 + y2 });
|
|
|
|
return ({ corner: { x: x0, y: y0 }}) => {
|
|
const velNormIntxn = perpIntxn(slopev, x1, y1, x0, y0);
|
|
const dx = Math.max(x0, velNormIntxn.x) - Math.min(x0, velNormIntxn.x);
|
|
const dy = Math.max(y0, velNormIntxn.y) - Math.min(y0, velNormIntxn.y);
|
|
const d = Math.sqrt(dy ** 2 + dx ** 2);
|
|
return d <= distance;
|
|
};
|
|
}
|
|
|
|
function cornerContactPosition(xc, yc, x, y, corner, cLength) {
|
|
const positionSeg = { xa: xc, ya: yc, xb: x, yb: y };
|
|
const posNormIntxn = perpIntxn(slope(positionSeg), x, y, corner.x, corner.y);
|
|
|
|
// shortest distance between corner and path
|
|
const aLength = distance(corner.x, corner.y, posNormIntxn.x, posNormIntxn.y);
|
|
// distance from position/normal intersection
|
|
const bLength = Math.sqrt(Math.abs(cLength ** 2 - aLength ** 2));
|
|
|
|
const intxnSeg = document.createElementNS(namespaceURIsvg, 'line');
|
|
intxnSeg.setAttribute('x1', posNormIntxn.x);
|
|
intxnSeg.setAttribute('y1', posNormIntxn.y);
|
|
intxnSeg.setAttribute('x2', x);
|
|
intxnSeg.setAttribute('y2', y);
|
|
|
|
return intxnSeg.getPointAtLength(bLength);
|
|
}
|
|
|
|
function edgeContactPosition(xc, yc, x, y, edge, radius, gearDown) {
|
|
const baseSlope = slope(edge);
|
|
let { xa, ya, xb, yb } = edge;
|
|
const positionSeg = { x1: x, y1: y, x2: xc, y2: yc };
|
|
// const edgeSeg = { x1: xa, y1: ya, x2: xb, y2: yb };
|
|
const dist = isLandable(edge) && gearDown ? radius + 2 : radius;
|
|
const b = getEdgeCollisionBoundary(edge, dist);
|
|
const edgeSeg = { x1: b.xa, y1: b.ya, x2: b.xb, y2: b.yb };
|
|
|
|
console.log("DIST", dist, "edge", edge, "edgeSeg", edgeSeg);
|
|
|
|
const baseNrmlIntxn = perpIntxn(baseSlope, xa, ya, x, y);
|
|
const basePosIntxn = lineIntxnPt(edgeSeg, positionSeg);
|
|
|
|
const baseSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y, basePosIntxn.x, basePosIntxn.y);
|
|
const normalSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y, x, y);
|
|
|
|
const theta = Math.atan(normalSegLength / baseSegLength);
|
|
const h = dist / Math.sin(theta);
|
|
|
|
const cl = document.createElementNS(namespaceURIsvg, 'line');
|
|
cl.setAttribute('x1', basePosIntxn.x);
|
|
cl.setAttribute('y1', basePosIntxn.y);
|
|
cl.setAttribute('x2', x);
|
|
cl.setAttribute('y2', y);
|
|
|
|
return cl.getPointAtLength(h);
|
|
}
|
|
|
|
function lineIntxnPt({ x1, y1, x2, y2 }, { x1: x3, y1: y3, x2: x4, y2: y4 }) {
|
|
// https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection#Given_two_points_on_each_line
|
|
const denominator = (x1 - x2) * (y3 - y4) - (y1 - y2) * (x3 - x4);
|
|
const l1Det = x1 * y2 - y1 * x2;
|
|
const l2Det = x3 * y4 - y3 * x4;
|
|
const x = (l1Det * (x3 - x4) - (x1 - x2) * l2Det) / denominator;
|
|
const y = (l1Det * (y3 - y4) - (y1 - y2) * l2Det) / denominator;
|
|
|
|
return { x: x, y: y };
|
|
}
|
|
|
|
function updateShip(s, elapsed) {
|
|
const degrees = getRotate(gun);
|
|
if (rotate > 0) gun.style.transform = `rotate(${(+degrees + rotationSpeed * elapsed) % 360}deg)`;
|
|
else if (rotate < 0) gun.style.transform = `rotate(${(+degrees - rotationSpeed * elapsed) % 360}deg)`;
|
|
|
|
const { x: px, y: py } = s.position;
|
|
const { x: vx, y: vy } = s.velocity;
|
|
const { x: ax, y: ay } = s.acceleration;
|
|
|
|
s.velocity = {
|
|
x: vx > 0 && vx + ax <= 0 ? 0 : vx + ax,
|
|
y: vy > 0 && vy + ay <= 0 ? 0 : vy + ay
|
|
};
|
|
|
|
velIndic.setAttribute('x2', s.velocity.x);
|
|
velIndic.setAttribute('y2', s.velocity.y);
|
|
acclIndic.setAttribute('x2', s.acceleration.x);
|
|
acclIndic.setAttribute('y2', s.acceleration.y);
|
|
|
|
const metersPerMillisecond = 0.001;
|
|
|
|
const pDelta = {
|
|
x: elapsed * s.velocity.x * metersPerMillisecond,
|
|
y: elapsed * s.velocity.y * metersPerMillisecond
|
|
};
|
|
|
|
const p = { x: pDelta.x + px, y: pDelta.y + py };
|
|
current = s.collision;
|
|
|
|
s.collision = detectCollision([px, py], p, s.velocity, shipRadius, map, s.gearDown);
|
|
if (s.collision) console.log("COLLISION", s.collision);
|
|
|
|
legs.style.display = s.gearDown ? "initial" : "none";
|
|
|
|
if (!current && s.collision) {
|
|
// just check if ya and yb are == ?, but then how do you know if the
|
|
// edge is facing up or down? compare xs?
|
|
|
|
// const baseSlope = slope(s.collision.edge);
|
|
// s.isLanded = true;
|
|
let posP;
|
|
if (s.collision.corner) {
|
|
posP = cornerContactPosition(p.x, p.y, px, py, s.collision.corner, shipRadius);
|
|
} else if (s.collision.edge) {
|
|
if (isLandable(s.collision.edge) && s.gearDown) s.isLanded = true;
|
|
posP = edgeContactPosition(p.x, p.y, px, py, s.collision.edge, shipRadius, s.gearDown);
|
|
}
|
|
|
|
s.velocity = { x: 0, y: 0 };
|
|
s.position = { x: posP.x, y: posP.y }
|
|
s.node.style.transform = `translate(${s.position.x}px, ${s.position.y}px)`;
|
|
} else if (current && s.collision) {
|
|
s.velocity = { x: 0, y: 0 };
|
|
} else {
|
|
if (s.isLanded && s.velocity.y < 0) {
|
|
s.gearDown = false;
|
|
s.isLanded = false;
|
|
}
|
|
|
|
s.position = { x: p.x, y: p.y };
|
|
s.node.style.transform = `translate(${s.position.x}px, ${s.position.y}px)`;
|
|
}
|
|
}
|
|
|
|
function updateEdges(position) {
|
|
// const collisionEdges = findAllEdges(allEdgePts, position);
|
|
const collisionEdges = [];
|
|
|
|
[...edgeContainer.children].forEach(l => {
|
|
const x1 = l.getAttribute('x1');
|
|
const y1 = l.getAttribute('y1');
|
|
const x2 = l.getAttribute('x2');
|
|
const y2 = l.getAttribute('y2');
|
|
const edge = `${x1},${y1} ${x2},${y2}`;
|
|
|
|
if (collisionEdges.includes(edge))
|
|
if ([
|
|
edgeContainer.childElementCount <= allStartingEdges.length,
|
|
!allStartingEdges.includes(edge)
|
|
].some(c => c))
|
|
l.remove();
|
|
});
|
|
}
|
|
|
|
function updateLines(elapsed, walls, position, velocity) {
|
|
const edges = walls.reduce((acc, wall) => {
|
|
return [...acc, ...wall.edges];
|
|
}, []);
|
|
|
|
const edgeIds = edges.map(e => `normal${e.xa}-${e.ya}-${e.xb}-${e.yb}`);
|
|
const nodes = [...linesContainer.children];
|
|
|
|
nodes.forEach(n => {
|
|
if (!edgeIds.includes(n.id)) n.remove();
|
|
});
|
|
|
|
// console.log("EDGES", edges);
|
|
|
|
edges.forEach(({ xa, ya, xb, yb }) => {
|
|
const id = `normal${xa}-${ya}-${xb}-${yb}`;
|
|
const g = linesContainer.querySelector(`#${id}`) || document.createElementNS(namespaceURIsvg, 'g');
|
|
const el = g.querySelector('line') || document.createElementNS(namespaceURIsvg, 'line');
|
|
const star = g.querySelector('circle') || document.createElementNS(namespaceURIsvg, 'circle');
|
|
star.setAttribute('r', 1);
|
|
// console.log(position, velocity, xa, ya, xb, yb);
|
|
|
|
const baseSlope = slope({ xa, ya, xb, yb });
|
|
|
|
let isx, isy;
|
|
|
|
// console.log("BASESLOPE", baseSlope);
|
|
|
|
if (baseSlope === -Infinity || baseSlope === Infinity) {
|
|
isx = xa;
|
|
isy = position.y;
|
|
} else if (baseSlope === 0) { // base is horizontal
|
|
isx = position.x;
|
|
isy = ya;
|
|
} else {
|
|
// const clPt = collisionPosition({ xa, ya, xb, yb }, position, velocity);
|
|
// console.log(clPt);
|
|
// isx = clPt.x;
|
|
// isy = clPt.y;
|
|
star.setAttribute('cx', 0);
|
|
star.setAttribute('cy', 0);
|
|
}
|
|
|
|
return g;
|
|
});
|
|
}
|
|
|
|
function init() {
|
|
started = false;
|
|
const mult = 10000;
|
|
|
|
s.position = { x: 10, y: 10 };
|
|
s.velocity = { x: 0, y: 0 };
|
|
|
|
// s. velocity = { x: 2*mult, y: 7*mult };
|
|
|
|
s.acceleration = { x: 0, y: 0 };
|
|
s.rotate = 0;
|
|
s.collision = null;
|
|
s.isLanded = false;
|
|
s.gearDown = false;
|
|
|
|
[...edgeContainer.children].forEach(c => c.remove());;
|
|
s.node.style.transform = `translate(${s.position.x}px, ${s.position.y}px)`;
|
|
|
|
wallElements.forEach(w => w.setAttribute('fill', 'black'));
|
|
velIndic.setAttribute('x2', 0);
|
|
velIndic.setAttribute('y2', 0);
|
|
acclIndic.setAttribute('x2', 0);
|
|
acclIndic.setAttribute('y2', 0);
|
|
|
|
time.innerText = "0";
|
|
}
|
|
|
|
function firstFrame(timestamp) {
|
|
zero = timestamp;
|
|
zeroForTimer = timestamp;
|
|
previous = timestamp;
|
|
animate(timestamp);
|
|
}
|
|
|
|
function animate(timestamp) {
|
|
const elapsed = timestamp - previous;
|
|
const delta = timestamp - zero;
|
|
let degrees = getRotate(gun);
|
|
previous = timestamp;
|
|
|
|
if (delta >= 1000) {
|
|
fps.innerText = frameCount;
|
|
|
|
// debug.innerText = `velocity ${velocity}\n`
|
|
// + 'bullets\nx\ty\tvx\tvy\n'
|
|
// + bullets.map(b => {
|
|
// return `${b.x.toFixed(2)}\t${b.y.toFixed(2)}\t${b.vx.toFixed(2)}\t${b.vy.toFixed(2)}`;
|
|
// }).join("\n");
|
|
|
|
zero = timestamp;
|
|
frameCount = 0;
|
|
} else {
|
|
frameCount++;
|
|
}
|
|
|
|
updateShip(s, elapsed);
|
|
updateBullets(elapsed);
|
|
// updateEdges(position);
|
|
if (drawCollisionLines) updateTriangles(position);
|
|
|
|
if (s.collision && !s.isLanded) {
|
|
started = false;
|
|
isReadingKeys = false;
|
|
s.collision.wall.node.setAttribute('fill', 'red');
|
|
}
|
|
|
|
if (restart) {
|
|
started = false;
|
|
restart = false;
|
|
init();
|
|
time.innerText = 0;
|
|
}
|
|
|
|
// const finished = edgeContainer.childElementCount <= 0;
|
|
// if (finished) started = false;
|
|
|
|
if (started) {
|
|
time.innerText = ((timestamp - zeroForTimer) * 0.001).toFixed(3);
|
|
// requestAnimationFrame(t => animate(t));
|
|
requestAnimationFrame(animate);
|
|
}
|
|
}
|
|
|
|
let force = 1;
|
|
let spacePressed = false;
|
|
let restartPressed = false;
|
|
let upPressed = false;
|
|
let downPressed = false;
|
|
let leftPressed = false;
|
|
let rightPressed = false;
|
|
let rotateCWPressed = false;
|
|
let rotateCCWPressed = false;
|
|
|
|
document.addEventListener("keydown", function(e) {
|
|
if (!isReadingKeys) return;
|
|
|
|
if (!started) {
|
|
started = true;
|
|
frameCount = 0;
|
|
requestAnimationFrame(firstFrame);
|
|
}
|
|
|
|
switch (e.code) {
|
|
case "Space":
|
|
if (!spacePressed) {
|
|
spacePressed = true;
|
|
fireBullet(s.position, s.velocity);
|
|
}
|
|
break;
|
|
case "KeyW":
|
|
case "ArrowUp":
|
|
if (!upPressed) {
|
|
upPressed = true;
|
|
s.acceleration.y += -force;
|
|
}
|
|
break;
|
|
case "KeyS":
|
|
case "ArrowDown":
|
|
if (!downPressed) {
|
|
downPressed = true;
|
|
s.acceleration.y += force;
|
|
}
|
|
break;
|
|
case "KeyA":
|
|
case "ArrowLeft":
|
|
if (!leftPressed) {
|
|
leftPressed = true;
|
|
if (!s.gearDown) s.acceleration.x += -force;
|
|
}
|
|
break;
|
|
case "KeyD":
|
|
case "ArrowRight":
|
|
if (!rightPressed) {
|
|
rightPressed = true;
|
|
if (!s.gearDown) s.acceleration.x += force;
|
|
}
|
|
break;
|
|
case "KeyQ":
|
|
case "Comma":
|
|
if (!rotateCCWPressed) {
|
|
rotateCCWPressed = true;
|
|
rotate += -1;
|
|
}
|
|
break;
|
|
case "KeyE":
|
|
case "Period":
|
|
if (!rotateCWPressed) {
|
|
rotateCWPressed = true;
|
|
rotate += 1;
|
|
}
|
|
break;
|
|
case "KeyP": // Pause
|
|
started = !started;
|
|
break;
|
|
case "KeyG": // Landing gear
|
|
s.gearDown = !s.gearDown;
|
|
break;
|
|
}
|
|
});
|
|
|
|
document.addEventListener("keyup", function(e) {
|
|
switch (e.code) {
|
|
case "Space":
|
|
spacePressed = false;
|
|
break;
|
|
case "KeyR":
|
|
isReadingKeys = true;
|
|
!started ? init() : restart = true;
|
|
break;
|
|
case "KeyW":
|
|
case "ArrowUp":
|
|
if (upPressed) {
|
|
upPressed = false;
|
|
s.acceleration.y -= -force;
|
|
}
|
|
break;
|
|
case "KeyS":
|
|
case "ArrowDown":
|
|
if (downPressed) {
|
|
downPressed = false;
|
|
s.acceleration.y -= force;
|
|
}
|
|
break;
|
|
case "KeyA":
|
|
case "ArrowLeft":
|
|
if (leftPressed) {
|
|
leftPressed = false;
|
|
if (!s.gearDown) s.acceleration.x -= -force;
|
|
}
|
|
break;
|
|
case "KeyD":
|
|
case "ArrowRight":
|
|
if (rightPressed) {
|
|
rightPressed = false;
|
|
if (!s.gearDown) s.acceleration.x -= force;
|
|
}
|
|
break;
|
|
case "KeyQ":
|
|
case "Comma":
|
|
if (rotateCCWPressed) {
|
|
rotateCCWPressed = false;
|
|
rotate -= -1;
|
|
}
|
|
break;
|
|
case "KeyE":
|
|
case "Period":
|
|
if (rotateCWPressed) {
|
|
rotateCWPressed = false;
|
|
rotate -= 1;
|
|
}
|
|
break;
|
|
}
|
|
});
|
|
|
|
const pointer = svg.querySelector('#pointer');
|
|
const xp = pointer.querySelector('.x');
|
|
const yp = pointer.querySelector('.y');
|
|
const pointerPt = svg.createSVGPoint();
|
|
|
|
svg.addEventListener("pointermove", function({ clientX, clientY }) {
|
|
pointerPt.x = clientX;
|
|
pointerPt.y = clientY;
|
|
// https://www.sitepoint.com/how-to-translate-from-dom-to-svg-coordinates-and-back-again/
|
|
const svgP = pointerPt.matrixTransform(svg.getScreenCTM().inverse());
|
|
|
|
if (bg.isPointInFill(svgP)) {
|
|
// console.log(Math.trunc(svgP.x), Math.trunc(svgP.y));
|
|
|
|
xp.innerText = Math.trunc(svgP.x);
|
|
yp.innerText = Math.trunc(svgP.y);
|
|
}
|
|
});
|
|
|
|
//]]></script>
|
|
</svg>
|
|
|