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WIP: gear down with G key

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Catalin Constantin Mititiuc
2025-12-29 09:07:41 -08:00
parent 2d72c7f83e
commit 109d1aa6fe
1 changed files with 85 additions and 100 deletions
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185
html/images/space.svg
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@@ -1,6 +1,6 @@
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- <svg viewBox="-200 -150 400 300" version="1.1" xmlns="http://www.w3.org/2000/svg"> -->
<svg viewBox="-10 -10 60 60" version="1.1" xmlns="http://www.w3.org/2000/svg">
<svg viewBox="-200 -150 400 300" version="1.1" xmlns="http://www.w3.org/2000/svg">
<!-- <svg viewBox="-10 -10 60 60" version="1.1" xmlns="http://www.w3.org/2000/svg"> -->
<style>
foreignObject {
font-size: 4pt;
@@ -109,7 +109,7 @@
</g>
<!-- <polygon class="wall" points="20,20 30,20 40,40 20,40" /> -->
<polygon class="wall" points="20,20 20,10 30,10 30,20 40,40 10,40" />
<polygon class="wall" points="20,20 50,20 70,40 70,70 50,90 20,90 0,70 0,40" />
<!-- <polygon class="wall" points="-10,20 10,10 10,20" /> -->
<!-- <polygon class="wall" points="20,20 40,20 40,40 20,40" /> -->
<!-- <polygon class="wall" points="10,10 20,10 20,20 10,20" /> -->
@@ -193,7 +193,8 @@
rotate: 0,
collision: null,
isLanded: false,
node: null
node: null,
gearDown: false
};
let friction = 0;
@@ -211,6 +212,7 @@
s.node = ship;
const gun = ship.querySelector('#cannon');
const shipBody = ship.querySelector("#body");
const legs = ship.querySelector("#legs");
// const walls = document.querySelectorAll('.wall:not(.inverse)');
const walls = document.querySelectorAll('.wall');
const bulletsContainer = document.querySelector("#bullets");
@@ -529,6 +531,44 @@
return edge || actualCorner;
}
function collisionPosition(edge, position, velocity) {
const baseSlope = slope(edge);
// if (Object.is(baseSlope, 0)) s.isLanded = true;
const { xa, ya, xb, yb } = edge;
const baseLine = { x1: xa, y1: ya, x2: xb, y2: yb };
const velocityLine = {
x1: position.x,
y1: position.y,
x2: position.x + velocity.x,
y2: position.y + velocity.y
};
// console.log("COLLISION DETECTED", s.collision);
// console.log("baseSlope", baseSlope);
const baseNrmlIntxn = perpIntxn(baseSlope, xa, ya, position.x, position.y);
const baseVelIntxn = lineIntxnPt(baseLine, velocityLine);
// console.log("baseNrmlIntxn", baseNrmlIntxn, "baseVelIntxn", baseVelIntxn);
const baseSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y , baseVelIntxn.x, baseVelIntxn.y);
const normalSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y, position.x, position.y);
// console.log("baseSegLength", baseSegLength, "normalSegLength", normalSegLength);
const theta = Math.atan(normalSegLength / baseSegLength);
const shipRadius = 5;
const h = shipRadius / Math.sin(theta);
const cl = document.createElementNS(namespaceURIsvg, 'line');
cl.setAttribute('x1', baseVelIntxn.x);
cl.setAttribute('y1', baseVelIntxn.y);
cl.setAttribute('x2', position.x);
cl.setAttribute('y2', position.y);
// console.log("h", h, "theta", theta);
const clPos = cl.getPointAtLength(h);
return clPos;
}
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);
@@ -561,61 +601,29 @@
const changeY = 0.001 * elapsed * velocityY;
let { x, y } = s.position;
console.log("current position", x, y);
// console.log("current position", x, y);
let position = [positionX, positionY] = restart ? [0, 0] : wrapPos(changeX + x, changeY + y);
let [xc, yc] = position;
const collE = getCollisionEdges(edgeszz, position);
console.log("collision edges", collE);
// console.log("collision edges", collE);
current = s.collision;
s.collision = detectCollisions(position, allWallCorners, findAllEdges(allEdgePts, position), collE);
console.log("future position", xc, yc);
// console.log("future position", xc, yc);
if (!current && s.collision) {
const baseSlope = slope(s.collision.edge);
if (Object.is(baseSlope, 0)) s.isLanded = true;
const { xa, ya, xb, yb } = s.collision.edge;
const baseLine = { x1: xa, y1: ya, x2: xb, y2: yb };
const velocityLine = {
x1: s.position.x,
y1: s.position.y,
x2: s.position.x + s.velocity.x,
y2: s.position.y + s.velocity.y
};
console.log("COLLISION DETECTED", s.collision);
console.log("baseSlope", baseSlope);
const baseNrmlIntxn = perpIntxn(baseSlope, xa, ya, s.position.x, s.position.y);
const baseVelIntxn = lineIntxnPt(baseLine, velocityLine);
console.log("baseNrmlIntxn", baseNrmlIntxn, "baseVelIntxn", baseVelIntxn);
const baseSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y , baseVelIntxn.x, baseVelIntxn.y);
const normalSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y, s.position.x, s.position.y);
console.log("baseSegLength", baseSegLength, "normalSegLength", normalSegLength);
const theta = Math.atan(normalSegLength / baseSegLength);
const shipRadius = 5;
const h = shipRadius / Math.sin(theta);
const cl = document.createElementNS(namespaceURIsvg, 'line');
cl.setAttribute('x1', baseVelIntxn.x);
cl.setAttribute('y1', baseVelIntxn.y);
cl.setAttribute('x2', s.position.x);
cl.setAttribute('y2', s.position.y);
console.log("h", h, "theta", theta, );
const clPos = cl.getPointAtLength(h);
if (Object.is(baseSlope, 0) && s.gearDown) s.isLanded = true;
const clPos = collisionPosition(s.collision.edge, s.position, s.velocity);
s.velocity = { x: 0, y: 0 };
s.position = { x: clPos.x, y: clPos.y }
s.node.style.transform = `translate(${s.position.x}px, ${s.position.y}px)`;
} else if (current && s.collision) {
// nothing
s.velocity = { x: 0, y: 0 };
} else {
// console.log("c");
s.isLanded = false;
s.position = { x: positionX, y: positionY }
s.node.style.transform = `translate(${positionX}px, ${positionY}px)`;
}
@@ -640,77 +648,48 @@
});
}
function updateLines(elapsed, edges, currentPos, futurePos) {
const edgeIds = edges.map(({edge: { xa, ya, xb, yb }}) => `normal${xa}-${ya}-${xb}-${yb}`);
function updateLines(elapsed, walls, position, velocity) {
const edges = walls.reduce((acc, wall) => {
return [...acc, ...wall.edges];
}, []);
const edgeIds = edges.map(e => `normal${e.xa}-${e.ya}-${e.xb}-${e.yb}`);
const nodes = [...linesContainer.children];
nodes.forEach(n => {
if (!edgeIds.includes(n.id)) n.remove();
});
edges.forEach(({ edge: { xa, ya, xb, yb }}) => {
// console.log("EDGES", edges);
edges.forEach(({ xa, ya, xb, yb }) => {
const id = `normal${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 });
const intx = perpIntxn(baseSlope, xa, ya, s.position.x, s.position.y);
const baseNrmlIntxn = perpIntxn(baseSlope, xa, ya, s.position.x, s.position.y);
// make sure this is using the calculated future velocity, not the current
const baseLine = { x1: xa, y1: ya, x2: xb, y2: yb };
let isx, isy;
const velocityLine = {
x1: s.position.x,
y1: s.position.y,
x2: s.position.x + s.velocity.x,
y2: s.position.y + s.velocity.y
};
const baseVelIntxn = lineIntxnPt(baseLine, velocityLine);
const baseSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y , baseVelIntxn.x, baseVelIntxn.y);
const normalSegLength = distance(baseNrmlIntxn.x, baseNrmlIntxn.y, s.position.x, s.position.y);
console.log("distance", baseSegLength);
const theta = Math.atan(normalSegLength / baseSegLength);
console.log("theta", theta);
// const contactPos = { x: Math.acos() }
const h = 5 / Math.sin(theta);
console.log("h", 5 / Math.sin(theta));
console.log("cos(theta)", Math.cos(theta));
el.setAttribute('x2', intx.x);
el.setAttribute('y2', intx.y);
el.setAttribute('x1', currentPos.x);
el.setAttribute('y1', currentPos.y);
console.log("normal line length at current position", el.getTotalLength());
el.setAttribute('x1', futurePos.x);
el.setAttribute('y1', futurePos.y);
console.log("normal line length at future position", el.getTotalLength());
el.setAttribute('x1', s.position.x);
el.setAttribute('y1', s.position.y);
star.setAttribute('cx', s.position.x);
star.setAttribute('cy', baseVelIntxn.y - h);
el.setAttribute('id', `normal${xa}-${ya}-${xb}-${yb}`);
g.appendChild(el);
g.appendChild(star);
linesContainer.appendChild(g);
const cl = document.createElementNS(namespaceURIsvg, 'line');
cl.setAttribute('x1', baseVelIntxn.x);
cl.setAttribute('y1', baseVelIntxn.y);
cl.setAttribute('x2', s.position.x);
cl.setAttribute('y2', s.position.y);
const clPt = cl.getPointAtLength(h);
console.log(clPt);
star.setAttribute('cx', clPt.x);
star.setAttribute('cy', clPt.y);
// 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;
});
@@ -740,7 +719,7 @@
}
function animate(timestamp) {
console.log("current timestamp", timestamp, "previous", previous);
// console.log("current timestamp", timestamp, "previous", previous);
const elapsed = timestamp - previous;
const delta = timestamp - zero;
@@ -762,10 +741,12 @@
frameCount++;
}
// console.log("COLLISION EDGES", edgeszz);
updateShip(s, elapsed, edgeszz);
updateBullets(elapsed);
// updateEdges(position);
// if (!s.collision) updateLines(elapsed, collE, {x, y}, s.position);
// if (!s.collision) updateLines(elapsed, edgeszz, s.position, s.velocity);
if (drawCollisionLines) updateTriangles(position);
if (s.collision && !s.isLanded) {
@@ -864,6 +845,10 @@
case "KeyP": // Pause
started = !started;
break;
case "KeyG": // Landing gear
legs.style.display = !legs.style.display || legs.style.display === "none" ? "initial" : "none";
s.gearDown = !s.gearDown;
break;
}
});
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