Gravity and ground height.

js/Movable.js

@@ -10,6 +10,7 @@ export default class Movable
         };
         this.position = new GeometryPoint();
         this.speed = speed;
+        this.jumpHeight = 35;
         this.fallSpeed = 0;
     }
 
@@ -39,6 +40,39 @@ export default class Movable
         return this.animations[this.currentAnimation].getRect();
     }
 
+    getPositionFootLeft()
+    {
+        return new GeometryPoint(
+            this.position.x - this.animations[this.currentAnimation].getWidth() * 0.5, this.position.y
+        );
+    }
+
+    getPositionFootRight()
+    {
+        return new GeometryPoint(
+            this.position.x + this.animations[this.currentAnimation].getWidth() * 0.5, this.position.y
+        );
+    }
+
+    jump()
+    {
+        this.fallSpeed -= this.jumpHeight;
+        this.isJumping = true;
+    }
+
+    getFootHeight()
+    {
+        return new GeometryPoint(
+            this.position.x,
+            this.position.y + this.animations[this.currentAnimation].getHeight()
+        );
+    }
+
+    setFootHeight(height)
+    {
+        this.position.y = height - this.animations[this.currentAnimation].getHeight();
+    }
+
     draw(context)
     {
         this.animations[this.currentAnimation].setFootPosition(this.position.x, this.position.y);