From 2e17234daf48d127f5563924ba40ac8b69c86ea6 Mon Sep 17 00:00:00 2001
From: Catalin Constantin Mititiuc <webdevcat@proton.me>
Date: Tue, 20 Jan 2026 16:46:10 -0800
Subject: [PATCH] WIP: Velocity while in contact with edge

---
 html/images/space.svg | 83 ++++++++-----------------------------------
 1 file changed, 15 insertions(+), 68 deletions(-)

diff --git a/html/images/space.svg b/html/images/space.svg
index ad1c525..9d34f0e 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -125,7 +125,7 @@
   <!-- <polygon class="wall" points="-10,50 -3,50 -3,60 -10,60" /> -->
 
   <!-- <polygon class="wall" points="20,-50 10,-50 10,-60 20,-60" /> -->
-  <polygon class="wall" points="-10,10 10,10 10,20 -10,20" />
+  <polygon class="wall" points="-10,10 10,10 10,40 -10,40" />
 
   <!-- <polygon class="wall" points="-20,-50 -10,-50 -10,-60 -20,-60" /> -->
   <!-- <polygon class="wall" points="20,50 10,50 10,60 20,60" /> -->
@@ -493,34 +493,18 @@ const Move = (() => {
         console.log("!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
         let posP;
         const contact = contacts[0];
+
         if (contact.corner) {
-          posP = cornerContactPosition(p.x, p.y, px, py, contact.corner, s.radius);
+          Velocity[entity_id] = { x: 0, y: 0 };
+          Position[entity_id] = cornerContactPosition(p.x, p.y, px, py, contact.corner, s.radius);
         } else if (contact.edge) {
           // if (isLandable(contact.edge) && s.gearDown) s.isLanded = true;
-          // console.log("contact", contact);
-          // posP = edgeContactPosition(p.x, p.y, px, py, contact.edge, s.radius);
-          // console.log("position calculated by edgeContactPosition", posP);
-          posP = contact.position;
-
-          // console.log("edge contact position current", posP);
-          // const velBeforeColl = { vx: Velocity[entity_id].x, vy: Velocity[entity_id].y };
-
-          // console.log("velocity before collision", velBeforeColl);
-
-          const { xa, ya, xb, yb } = contact.edge;
-
-          const positionSeg = { x1: px, y1: py, x2: p.x, y2: p.y };
-          const edgeSeg = { x1: xa, y1: ya, x2: xb, y2: yb };
-
           console.log("CURRENT POSITION", px, py);
           console.log("INTENDED POSITION", p.x, p.y);
           console.log("CONTACT POSITION", contact.position);
 
-          // if (px === posP.x && py === posP.y) {
-            // const m1 = slope({ xa: px, ya: py, xb: p.x, yb: p.y });
-            if (contact.edge.ya === contact.edge.yb && contact.edge.xa < contact.edge.xb) {
-              console.log("ON A FLAT EDGE");
-              // Velocity[entity_id] = { x: velX, y: velY };
+          if (contact.edge.ya === contact.edge.yb) {
+            if (contact.edge.xa < contact.edge.xb) {
               if (v.y <= 0) {
                 Velocity[entity_id] = { x: v.x, y: v.y };
                 Position[entity_id] = { x: p.x, y: p.y };
@@ -528,54 +512,17 @@ const Move = (() => {
                 Velocity[entity_id] = { x: v.x, y: 0 };
                 Position[entity_id] = { x: p.x, y: contact.position.y };
               }
-              // Velocity[entity_id].x = v.x;
-
-              // Position[entity_id] = { x: p.x, y: p.y };
+            } else if (contact.edge.xa > contact.edge.xb) {
+              if (v.y <= 0) {
+                Velocity[entity_id] = { x: v.x, y: 0 };
+                Position[entity_id] = { x: p.x, y: contact.position.y };
+              } else if (v.y > 0) {
+                Velocity[entity_id] = { x: v.x, y: v.y };
+                Position[entity_id] = { x: p.x, y: p.y };
+              }
             }
-            // const m1 = slope({ xa: vx, ya: vy, xb: v.x, yb: v.y });
-            // const m2 = slope(contact.edge);
-            // const m2 = 1/-slope(contact.edge); //normal??
-
-            // we need the angle between the velocity and normal vector, no?
-
-            // const theta = Math.atan((m1-m2) / (1+m2*m2));
-            // const velX = v.x * Math.sin(theta);
-            // const velY = v.y * Math.cos(theta);
-            // console.log("vvvvvvvvvvvvvvvvvvvv", v);
-            // console.log("theta", theta);
-
-            // console.log("theta", theta, "velX", velX.toFixed(15), "velY", velY.toFixed(15));
-
-            // i need the normal force to push back
-
-            // Velocity[entity_id] = { x: velX, y: velY };
-            // Position[entity_id] = { x: p.x, y: p.y };
-          // } else {
-          //   Velocity[entity_id] = { x: 0, y: 0 };
-          //   Position[entity_id] = { x: posP.x, y: posP.y };
-          // }
-
-          // console.log("POSITIONSEG", positionSeg);
-          // console.log("EDGESEG", edgeSeg);
+          }
         }
-
-        // we need to map velocity in segments
-        // Velocity[entity_id] = { x: 0, y: 0 };
-        // Position[entity_id] = { x: posP.x, y: posP.y };
-
-        // s.node.style.transform = `translate(${Position[entity_id].x}px, ${Position[entity_id].y}px)`;
-      // } else if (current && s.collision) {
-      //   console.log("2222222222222222222222222222222");
-
-        // if (s.isLanded && s.velocity.y < 0) {
-        //   s.gearDown = false;
-        //   s.isLanded = false;
-        //   s.position = { x: p.x, y: p.y };
-        //   s.node.style.transform = `translate(${s.position.x}px, ${s.position.y}px)`;
-        //   s.collision = null;
-        // } else {
-        //   s.velocity = { x: 0, y: 0 };
-        // }
       } else {
         Velocity[entity_id] = { x: v.x, y: v.y };
         Position[entity_id] = { x: p.x, y: p.y };