Fix s and t calculations

html/images/space.svg

@@ -193,8 +193,9 @@
 
     const s = {
       position: { x: 0, y: 0 },
-      velocity: { x: 5, y: -10 },
+      // velocity: { x: 5, y: -10 },
-      // velocity: { x: 5*mult, y: -10*mult },
+      // velocity: { x: -5*mult, y: 10*mult },
+      velocity: { x: -5*mult, y: 10*mult },
       // velocity: { x: 0, y: -10 },
       // velocity: { x: 10, y: 10 },
       // velocity: { x: -10, y: -10 },
@@ -853,8 +854,11 @@
       current = s.collision;
       // s.collision = detectCollisions(position, allWallCorners, collE);
       s.collision = cwcd.find(c => {
-        const d = distance(c.corner.x, c.corner.y, xc, yc);
+        const positionSegLength = distance(xc, yc, x, y);
 
+        if (!positionSegLength) return false;
+
+        const d = distance(c.corner.x, c.corner.y, xc, yc);
         const positionSeg = { xa: xc, ya: yc, xb: x, yb: y };
         const slopeps = slope(positionSeg);
         const posNormIntxn = perpIntxn(slopeps, x, y, c.corner.x, c.corner.y);
@@ -866,8 +870,15 @@
 
         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);
 
-        return d <= shipRadius || (s >= 0 && t <= 1);
+        console.log("corner", c.corner);
+        console.log("positionSeg", positionSeg);
+        console.log("cornerSeg", cornerSeg);
+        console.log("s", s, "t", t);
+        console.log("d", d, "shipRadius", shipRadius);
+
+        return d <= shipRadius || (s >= 0 && roundedT <= 1);
       });
 
       // legs.style.display = !legs.style.display || legs.style.display === "none" ? "initial" : "none";