WIP: adjusting edge collision distance

html/images/space.svg

@@ -76,7 +76,7 @@
     }
 
     line#velocity-indicator {
-      stroke: blue;
+      stroke: none;
       /* stroke-width: 1px; */
     }
 
@@ -292,6 +292,9 @@ const map = (function(els) {
 let allStartingEdges;
 init();
 
+const b = map.edges.map(({ edge }) => getEdgeCollisionBoundary(edge, shipRadius));
+b.forEach(b => drawLine(b.xa, b.ya, b.xb, b.yb, "orange"));
+
 function distance(x1, y1, x2, y2) {
   return Math.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2);
 }
@@ -540,20 +543,32 @@ function isLandable(edge) {
   // 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) {
   return ({ edge, wall }) => {
     if (xc === x && yc === y) return;
 
-    const { xa, ya, xb, yb } = edge;
+    // const { xa, ya, xb, yb } = edge;
-    const length = distance(xa, ya, xb, yb);
+    // const length = distance(xa, ya, xb, yb);
-    const rise = yb - ya;
+    // const rise = yb - ya;
-    const run = xb - xa;
+    // const run = xb - xa;
-
+    //
-    const riol = rise / length * radius;
+    // const riol = rise / length * radius;
-    const ruol = run / length * radius;
+    // const ruol = run / length * radius;
-
+    //
+    // const edgeSeg = { xa: xa + riol, ya: ya - ruol, xb: xb + riol, yb: yb - ruol};
+    const edgeSeg = getEdgeCollisionBoundary(edge, radius);
     const positionSeg = { xa: x, ya: y, xb: xc, yb: yc };
-    const edgeSeg = { xa: xa + riol, ya: ya - ruol, xb: xb + riol, yb: yb - ruol};
 
     const { xa: x1, ya: y1, xb: x2, yb: y2 } = positionSeg;
     const { xa: x3, ya: y3, xb: x4, yb: y4 } = edgeSeg;
@@ -676,14 +691,19 @@ function edgeContactPosition(xc, yc, x, y, edge, radius) {
   const positionSeg = { x1: x, y1: y, x2: xc, y2: yc };
   const edgeSeg = { x1: xa, y1: ya, x2: xb, y2: yb };
 
+  drawLine(x, y, xc, yc, "green");
+
   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);
 
+  drawLine(baseNrmlIntxn.x, baseNrmlIntxn.y, basePosIntxn.x, basePosIntxn.y, "blue");
+  drawLine(baseNrmlIntxn.x, baseNrmlIntxn.y, x, y, "purple");
+
   const theta = Math.atan(normalSegLength / baseSegLength);
-  const h = radius / Math.sin(theta);
+  const h = (radius)/ Math.sin(theta);
 
   const cl = document.createElementNS(namespaceURIsvg, 'line');
   cl.setAttribute('x1', basePosIntxn.x);
@@ -691,7 +711,11 @@ function edgeContactPosition(xc, yc, x, y, edge, radius) {
   cl.setAttribute('x2', x);
   cl.setAttribute('y2', y);
 
-  return cl.getPointAtLength(h);
+  const pt = cl.getPointAtLength(h);
+  drawLine(basePosIntxn.x, basePosIntxn.y, pt.x, pt.y, "yellow");
+
+  // return cl.getPointAtLength(h);
+  return pt;
 }
 
 function lineIntxnPt({ x1, y1, x2, y2 }, { x1: x3, y1: y3, x2: x4, y2: y4 }) {
@@ -734,7 +758,9 @@ function updateShip(s, elapsed) {
   const p = { x: pDelta.x + px, y: pDelta.y + py };
   current = s.collision;
 
-  s.collision = detectCollision([px, py], p, s.velocity, shipRadius, map);
+  const tempRadius = 10;
+
+  s.collision = detectCollision([px, py], p, s.velocity, tempRadius, map);
   if (s.collision) console.log("COLLISION", s.collision);
 
   legs.style.display = s.gearDown ? "initial" : "none";
@@ -750,7 +776,7 @@ function updateShip(s, elapsed) {
     if (s.collision.corner) {
       posP = cornerContactPosition(p.x, p.y, px, py, s.collision.corner, shipRadius);
     } else if (s.collision.edge) {
-      posP = edgeContactPosition(p.x, p.y, px, py, s.collision.edge, shipRadius);
+      posP = edgeContactPosition(p.x, p.y, px, py, s.collision.edge, tempRadius);
     }
 
     s.velocity = { x: 0, y: 0 };
@@ -838,12 +864,12 @@ function updateLines(elapsed, walls, position, velocity) {
 
 function init() {
   started = false;
-  const mult = 10000;
+  const mult = 10;
 
   s.position = { x: 10, y: 10 };
-  s.velocity = { x: 0, y: 0 };
+  // s.velocity = { x: 0, y: 0 };
 
-  // s. velocity = { x: 2*mult, y: 7*mult };
+  s. velocity = { x: -5*mult, y: 7*mult };
 
   s.acceleration = { x: 0, y: 0 };
   s.rotate = 0;