fix center_mouse to behave well outside drawing areatab-completelisp/set

1 files changed, 13 insertions, 7 deletions

diff --git a/src/app.rs b/src/app.rs
index 266c28b..68d687f 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -296,13 +296,19 @@ impl<'ctx> AppState<'ctx> {
 
     // brings the pixel under the mouse to win center
     pub fn center_mouse(&mut self) {
-        let win_size = self.canvas.window().size();
-        let win_center = ((win_size.0 / 2) as i32, (win_size.1 / 2) as i32);
-        self.context
-            .mouse()
-            .warp_mouse_in_window(self.canvas.window(), win_center.0, win_center.1);
-        let delta = Point::from(self.mouse) - Point::from(win_center);
-        self.start -= delta;
+        if !self.within_canvas(self.mouse) {
+            self.center_grid();
+        } else {
+            let win_size = self.canvas.window().size();
+            let win_center = ((win_size.0 / 2) as i32, (win_size.1 / 2) as i32);
+            self.context.mouse().warp_mouse_in_window(
+                self.canvas.window(),
+                win_center.0,
+                win_center.1,
+            );
+            let delta = Point::from(self.mouse) - Point::from(win_center);
+            self.start -= delta;
+        }
     }
 
     pub fn reduce_intensity(&mut self) {