Merge branch bugfix/4-side-collision-response into main (#105)

Fix collision response

Fix collision response letting Moving Entities get stuck when colliding on all 4 sides.

Author: Kitt3120

src/ts/engine/entitiy/entitymanager.ts

@@ -237,15 +237,16 @@ class EntityManager {
         continue;
       }
 
+      let bothEntitiesAreMovingEntities =
+        entityIsMovingEntity && otherEntityIsMovingEntity;
+
       let movingEntities: MovingEntity[] = [];
       if (entityIsMovingEntity) {
         movingEntities.push(entity as MovingEntity);
       }
       if (otherEntityIsMovingEntity) {
         movingEntities.push(otherEntity as MovingEntity);
       }
-      let bothEntitiesAreMovingEntities =
-        entityIsMovingEntity && otherEntityIsMovingEntity;
 
       let intersection = entity.boundingBox.intersect(otherEntity.boundingBox);
       if (intersection.points.length === 0) {
@@ -287,18 +288,24 @@ class EntityManager {
           .subtract(intersection.center)
           .normalize();
 
-        if (
-          movingEntityCollisions.get(Direction.Top) ||
-          movingEntityCollisions.get(Direction.Bottom)
-        ) {
-          pushDirection = Matrix2D.ignoreXMatrix.multiplyVector(pushDirection);
-        }
+        if (movingEntityCollisions.size === 4) {
+          pushDirection = pushDirection.multiplyScalar(0.25);
+        } else {
+          if (
+            movingEntityCollisions.get(Direction.Top) ||
+            movingEntityCollisions.get(Direction.Bottom)
+          ) {
+            pushDirection =
+              Matrix2D.ignoreXMatrix.multiplyVector(pushDirection);
+          }
 
-        if (
-          movingEntityCollisions.get(Direction.Left) ||
-          movingEntityCollisions.get(Direction.Right)
-        ) {
-          pushDirection = Matrix2D.ignoreYMatrix.multiplyVector(pushDirection);
+          if (
+            movingEntityCollisions.get(Direction.Left) ||
+            movingEntityCollisions.get(Direction.Right)
+          ) {
+            pushDirection =
+              Matrix2D.ignoreYMatrix.multiplyVector(pushDirection);
+          }
         }
 
         pushDirection = pushDirection.multiplyScalar(

src/ts/engine/entitiy/movingentity.ts

@@ -66,16 +66,39 @@ class MovingEntity extends Entity {
   public update(tickDelta: number): void {
     super.update(tickDelta);
 
-    if (this._collisions[Direction.Top] && this._velocity.y < 0) {
+    if (
+      this._collisions[Direction.Top] &&
+      !this.collisions[Direction.Bottom] &&
+      this._velocity.y < 0
+    ) {
       this._velocity = Matrix2D.ignoreYMatrix.multiplyVector(this._velocity);
     }
-    if (this._collisions[Direction.Right] && this._velocity.x > 0) {
+
+    if (
+      this._collisions[Direction.Right] &&
+      !this.collisions[Direction.Left] &&
+      this._velocity.x > 0
+    ) {
+      this._velocity = Matrix2D.ignoreXMatrix.multiplyVector(this._velocity);
+    }
+
+    if (
+      this._collisions[Direction.Bottom] &&
+      !this.collisions[Direction.Top] &&
+      this._velocity.y > 0
+    ) {
+      this._velocity = Matrix2D.ignoreYMatrix.multiplyVector(this._velocity);
+    }
+
+    if (
+      this._collisions[Direction.Left] &&
+      !this.collisions[Direction.Right] &&
+      this._velocity.x < 0
+    ) {
       this._velocity = Matrix2D.ignoreXMatrix.multiplyVector(this._velocity);
     }
+
     if (this._collisions[Direction.Bottom]) {
-      if (this._velocity.y > 0) {
-        this._velocity = Matrix2D.ignoreYMatrix.multiplyVector(this._velocity);
-      }
       this._velocity = new Matrix2D(0.95, 0, 0, 1).multiplyVector(
         this._velocity
       );
@@ -85,9 +108,6 @@ class MovingEntity extends Entity {
         this._velocity
       );
     }
-    if (this._collisions[Direction.Left] && this._velocity.x < 0) {
-      this._velocity = Matrix2D.ignoreXMatrix.multiplyVector(this._velocity);
-    }
 
     let newLocation = this.location.add(
       this._velocity.multiplyScalar(tickDelta / 100)