(#54) make scale friction depend on the delta scale

src/config.nim

@@ -10,8 +10,8 @@ type Config* = object
 const defaultConfig* = Config(
   scrollSpeed: 1.0,
   dragVelocityFactor: 10.0,
-  dragFriction: 3.0,
+  dragFriction: 2.0,
-  scaleFriction: 10.0,
+  scaleFriction: 4.0,
   fps: 60
 )
 

src/navigation.nim

@@ -27,7 +27,7 @@ proc update*(camera: var Camera, config: Config, dt: float, mouse: Mouse, image:
     let p1 = (mouse.curr - (windowSize * 0.5)) / camera.scale
     camera.position += p0 - p1
 
-    camera.delta_scale -= sgn(camera.delta_scale).float * config.scale_friction * dt
+    camera.delta_scale -= camera.delta_scale * dt * config.scale_friction
 
   if not mouse.drag and (camera.velocity.length > VELOCITY_THRESHOLD):
     camera.position += camera.velocity * dt