Place contact point just outside wall shape

html/images/space.svg

@@ -244,17 +244,17 @@ const Move = (() => {
 
     // https://en.wikipedia.org/wiki/Curve_orientation#Practical_considerations
     // Determinant for a convex polygon
-    // const det = (xb - xa) * (yc - ya) - (xc - xa) * (yb - ya);
+    const det = (xb - xa) * (yc - ya) - (xc - xa) * (yb - ya);
 
-    const subR = (a, b) => Math.round(a * 100 - b * 100) / 100;
+    // const subR = (a, b) => Math.round(a * 100 - b * 100) / 100;
-
+    //
-    const xba = subR(xb, xa);
+    // const xba = subR(xb, xa);
-    const yca = subR(yc, ya);
+    // const yca = subR(yc, ya);
-    const xca = subR(xc, xa);
+    // const xca = subR(xc, xa);
-    const yba = subR(yb, ya);
+    // const yba = subR(yb, ya);
-
+    //
-    const det = subR(xba * yca, xca * yba);
+    // const det = subR(xba * yca, xca * yba);
-    console.log("dett", det, "edge", xa, ya, xb, yb, "position", xc, yc);
+    console.log("dett", det, "edge", xa, ya, xb, yb, "position", xc, yc, "aaa");
 
     // console.log("xa, ya, xb, yb, xc, yc", xa, ya, xb, yb, xc, yc);
     // const detEx = (xb*expo - xa*expo) * (yc*expo - ya*expo) - (xc*expo - xa*expo) * (yb*expo - ya*expo);
@@ -289,7 +289,7 @@ const Move = (() => {
     // console.log(xb, xa, yc, ya, xc, xa, yb, ya);
     // console.log("dettttttttttttttttttttt", det);
     // if det == 0, that means we are in contact with that edge
-    return det <= 0;
+    return det < 0;
   }
 
   function isAcute([xa, ya], [xb, yb], [xc, yc]) {
@@ -508,9 +508,20 @@ const Move = (() => {
         // console.log("s", s, "roundedS", roundedS, "t", t, "roundedT", roundedT);
         console.log("s", s, "t", t);
         console.log("sr", sr, "tr", tr);
+        const x1r = Math.round(x1 * 100);
+        const x2r = Math.round(x2 * 100);
+        const y1r = Math.round(y1 * 100);
+        const y2r = Math.round(y2 * 100);
+        const x3r = Math.round(x3 * 100);
+        const x4r = Math.round(x4 * 100);
+        const y3r = Math.round(y3 * 100);
+        const y4r = Math.round(y4 * 100);
+
 
         // 2.03 * 10
         // 20.299999999999997
+        const xsrOff = Math.round(x1r + (sr + 1) * (x2r - x1r)) / 100;
+        const ysrOff = Math.round(y1r + (sr + 1) * (y2r - y1r)) / 100;
 
         // if (roundedS >= 0 && roundedS <= 1 && roundedT >= 0 && roundedT <= 1) {
         // if (s >= 0 && s < 1 && t >= 0 && t <= 1) { // this falls through
@@ -528,17 +539,10 @@ const Move = (() => {
           console.log("x1", x1, "x2", x2);
           console.log("y1", y1, "y2", y2);
 
-          const x1r = Math.round(x1 * 100);
-          const x2r = Math.round(x2 * 100);
-          const y1r = Math.round(y1 * 100);
-          const y2r = Math.round(y2 * 100);
-          const x3r = Math.round(x3 * 100);
-          const x4r = Math.round(x4 * 100);
-          const y3r = Math.round(y3 * 100);
-          const y4r = Math.round(y4 * 100);
-
           const xsr = Math.round(x1r + sr * (x2r - x1r)) / 100;
           const ysr = Math.round(y1r + sr * (y2r - y1r)) / 100;
+
+
           const xtr = Math.round(x3r + tr * (x4r - x3r)) / 100;
           const ytr = Math.round(y3r + tr * (y4r - y3r)) / 100;
 
@@ -555,7 +559,8 @@ const Move = (() => {
           const lnP = ln.getPointAtLength(lnD);
 
           // collision.position = { x: xs, y: ys };
-          collision.position = { x: xsr, y: ysr };
+          // collision.position = { x: xsr, y: ysr };
+          collision.position = { x: xsrOff, y: ysrOff };
           // collision.position = { x: xtr, y: ytr };
           // collision.position = lnP;
 
@@ -912,8 +917,8 @@ const Move = (() => {
           };
           console.log("reflection before rounding", refP, "aaa");
 
-          refP.x = Math.round(refP.x * 100) / 100;
+          // refP.x = Math.round(refP.x * 100) / 100;
-          refP.y = Math.round(refP.y * 100) / 100;
+          // refP.y = Math.round(refP.y * 100) / 100;
 
           // shouldnt change isClockwise if isAcute isn't also changing
           // if we go from clockwise to not clockwise without changing acuteness,
@@ -926,6 +931,7 @@ const Move = (() => {
           isA = isAcute([contact.edge.xa, contact.edge.ya], [contact.edge.xb, contact.edge.yb], [refP.x, refP.y]);
           console.log("is reflected position acute with current contact", isA, "aaa");
 
+          // how close can you come to an edge without being on it?
 
           const inWall = contact.wall.node.isPointInFill(newP);
           console.log("is our calculated next position inside current edge's wall?", inWall, "dett");
@@ -1072,8 +1078,8 @@ function init() {
   // drawCircle(0, 0);
 
   // s.acceleration = { x: -1, y: 2 };
-  s.acceleration = { x: -2, y: 2 };
+  // s.acceleration = { x: -2, y: 2 };
-  // s.acceleration = { x: 0, y: 0 };
+  s.acceleration = { x: 0, y: 0 };
 
   Ships.forEach(({ entity_id }) => {
     // Acceleration[entity_id] = s.acceleration;