Combine zooming in and zooming out into one function

There was a lot of duplicate and hacky code in the zooming functions, so
I made them cleaner while hopefully staying true to the idea.

1 files changed, 8 insertions, 5 deletions

diff --git a/src/main.rs b/src/main.rs
index f116561..f3838a5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -26,11 +26,14 @@ fn main() {
             transform.move_by_px((rl.get_mouse_position() - last_mouse_pos).into());
         }
 
-        // Handle scrolling of the canvas
-        if rl.get_mouse_wheel_move() > 0 {
-            transform.try_zoom_in(rl.get_mouse_position().into());
-        } else if rl.get_mouse_wheel_move() < 0 {
-            transform.try_zoom_out(rl.get_mouse_position().into());
+        let mouse_wheel_move = rl.get_mouse_wheel_move();
+        if mouse_wheel_move != 0 {
+            // Zoom in for positive and zoom out for negative mouse wheel rotations.
+            let factor = if mouse_wheel_move > 0 { 1.2 } else { 1. / 1.2 };
+            transform.try_zoom(
+                rl.get_mouse_position().into(),
+                mouse_wheel_move.abs() as f32 * factor,
+            );
         }
 
         editor.update(&rl, &transform);