game: core: use server game calulation form

frontend/static/js/api/game/Wall.js

@@ -0,0 +1,20 @@
+
+
+class Wall
+{
+    constructor (rail_start_x, rail_start_y, rail_stop_x, rail_stop_y)
+    {
+        this.rail_start_x = rail_start_x;
+        this.rail_start_y = rail_start_y;
+        this.rail_stop_x = rail_stop_x;
+        this.rail_stop_y = rail_stop_y;
+    }
+
+    draw(ctx)
+    {
+        ctx.moveTo(this.rail_start_x, this.rail_start_y);
+        ctx.lineTo(this.rail_stop_x, this.rail_stop_y);
+    }
+}
+
+export { Wall }