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Zoom to cursor in game_of_life example

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This commit is contained in:
Héctor Ramón Jiménez 2020-05-01 05:42:07 +02:00
parent 0a5f1bb676
commit ffbe59f812
1 changed files with 15 additions and 1 deletions
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16
examples/game_of_life/src/main.rs
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@ -292,7 +292,21 @@ mod grid {
if y < 0.0 && self.scaling > Self::MIN_SCALING if y < 0.0 && self.scaling > Self::MIN_SCALING
|| y > 0.0 && self.scaling < Self::MAX_SCALING || y > 0.0 && self.scaling < Self::MAX_SCALING
{ {
self.scaling = (self.scaling + y / 30.0) let factor = y / 30.0;
if let Some(cursor_to_center) =
cursor.position_from(bounds.center())
{
self.translation = self.translation
- Vector::new(
cursor_to_center.x * factor
/ (self.scaling * self.scaling),
cursor_to_center.y * factor
/ (self.scaling * self.scaling),
);
}
self.scaling = (self.scaling + factor)
.max(Self::MIN_SCALING) .max(Self::MIN_SCALING)
.min(Self::MAX_SCALING); .min(Self::MAX_SCALING);