Pull away from contacted walls

README.md

@@ -119,3 +119,8 @@ Delete your `.sitegen_cache` file.
 * use sitecache with pandoc renderer
 * draft documents
 * treesitter highlighting for moonscript
+
+--
+
+- Bounce off corners algo
+- Bounce off multiple simultaneous contacts

html/images/space.svg

@@ -515,6 +515,10 @@ const Move = (() => {
           const run = contact.edge.xb-contact.edge.xa;
 
           drawLine(p.x - v.x, p.y - v.y, p.x, p.y, "blue"); // velocity vector
+          console.log("velocity vector", v.x, v.y);
+          const det = v.x * rise - v.y * run;
+          console.log("DEEEEEEEETTTTTTTTTTTTTTT", det);
+
           drawLine(contact.edge.xa, contact.edge.ya, contact.edge.xb, contact.edge.yb, "green"); // edge vector
 
           let newY;
@@ -568,13 +572,15 @@ const Move = (() => {
           newY = prAvy - prBvy;
 
           drawLine(p.x, p.y, p.x + vec2.rightNormal.x , p.y + vec2.rightNormal.y, "black"); // edge normal vector
-          drawLine(p.x, p.y, p.x + newX , p.y + newY, "blue"); // bounced velocity vector
+          drawLine(p.x, p.y, p.x + newX, p.y + newY, "blue"); // bounced velocity vector
 
-          Velocity[entity_id] = { x: newX, y: newY };
-
-          // TODO can't set position without ball getting stuck
-          // Position[entity_id] = { x: p.x, y: p.y };
-          // Position[entity_id] = contact.position;
+          if (det < 0) {
+            Velocity[entity_id] = { x: newX, y: newY };
+            Position[entity_id] = contact.position;
+          } else {
+            Velocity[entity_id] = { x: v.x, y: v.y };
+            Position[entity_id] = { x: p.x, y: p.y };
+          }
         }
       } else {
         Velocity[entity_id] = { x: v.x, y: v.y };
@@ -664,7 +670,7 @@ function init() {
   started = false;
   const mult = 10;
 
-  s.position = { x: 0, y: 0 };
+  s.position = { x: 0, y: -10 };
   // s.velocity = { x: 0, y: -10 };
   // s.velocity = { x: 10, y: 20 };
   s.velocity = { x: 0, y: 0 };