repel1+

src/main.zig

@@ -131,7 +131,7 @@ const Emitter = struct {
                 for (att) |at|
                 {
                     //std.debug.print("force:{}\n",.{at.attract(p.*)});
-                    p.applyForce(at.attract(p.*));
+                    p.applyForce(at.repel(p.*));
                 }
                 p.update();
 
@@ -169,6 +169,23 @@ const Attractor = struct {
             return .{.a=.{.x=0,.y=0,.z=0}};
         }
     }
+    pub fn repel(self: Attractor, particle: Particle) pr.Vec {
+        if(self.init_done == 1)
+        {
+            const distance = self.vec.sub(particle.position);
+            var force: pr.Vec = undefined;
+            if (distance.a.x != 0 and distance.a.y != 0) {
+                force.a.x = -distance.a.x / 1000;
+                force.a.y = -distance.a.y / 1000;
+                force.a.z = 0;
+            }
+            return force;
+        }
+        else
+        {
+            return .{.a=.{.x=0,.y=0,.z=0}};
+        }
+    }
     pub fn draw(self: Attractor) void {
         const posx: i32 = @intFromFloat(screenWidth / 2 + self.vec.a.x);
         const posy: i32 = @intFromFloat(screenHeight / 2 + self.vec.a.y);