friction

src/main.zig

@@ -83,9 +83,11 @@ const Particle = struct {
         self.velocity.a.y += val;
     }
     pub fn applyForce(self : *Self,vec : pr.Vec) void {
-        self.acceleration.a.x += vec.a.x * 0.5;
+        self.acceleration.a.x = vec.a.x * 0.8;
-        self.acceleration.a.y += vec.a.y * 0.5;
+        self.acceleration.a.y = vec.a.y * 0.8;
-        self.acceleration.a.z += vec.a.z;
+        self.acceleration.a.z = vec.a.z;
+        self.velocity.a.x *= 0.999;
+        self.velocity.a.y *= 0.999;
     }
 };
 
@@ -127,7 +129,7 @@ const Emitter = struct
         var posx : i32 = 0;
         var posy : i32 = 0;
         const att : Attractor = .{.vec = .{.a=.{.x=10,.y=10,.z=10}}};
-        const att2 : Attractor = .{.vec = .{.a=.{.x=-100,.y=-100,.z=0}}};
+        const att2 : Attractor = .{.vec = .{.a=.{.x=-200,.y=-200,.z=0}}};
 
         att.draw();
         att2.draw();
@@ -135,7 +137,7 @@ const Emitter = struct
             if(p.show == 1)
             {
 
-                p.applyGravity(2);
+                p.applyGravity(0);
                 p.applyForce(att.attract(p.*));
                 p.applyForce(att2.attract(p.*));
                 p.update();
@@ -154,13 +156,15 @@ const Attractor = struct
     pub fn attract(self:Attractor,particle : Particle) pr.Vec
     {
 
-        var vec = self.vec.sub(particle.position);
+        const distance = self.vec.sub(particle.position);
-        if( vec.a.x != 0 and vec.a.y != 0) 
+        var force : pr.Vec = undefined;
+        if( distance.a.x != 0 and distance.a.y != 0) 
         {
-            vec.a.x = vec.a.x/200;
+            force.a.x = distance.a.x/200;
-            vec.a.y = vec.a.y/200;
+            force.a.y = distance.a.y/200;
+            force.a.z = 0;
         }
-        return vec;
+        return force;
     }
     pub fn draw(self:Attractor) void
     {