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Improve scrolling smoothness in game_of_life

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This commit is contained in:
Héctor Ramón Jiménez 2020-05-01 06:23:05 +02:00
parent ffbe59f812
commit 1833c77312
1 changed files with 10 additions and 7 deletions
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17
examples/game_of_life/src/main.rs
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@ -292,24 +292,27 @@ 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
{ {
let factor = y / 30.0; let old_scaling = self.scaling;
self.scaling = (self.scaling
* (1.0 + y / 30.0))
.max(Self::MIN_SCALING)
.min(Self::MAX_SCALING);
if let Some(cursor_to_center) = if let Some(cursor_to_center) =
cursor.position_from(bounds.center()) cursor.position_from(bounds.center())
{ {
let factor = self.scaling - old_scaling;
self.translation = self.translation self.translation = self.translation
- Vector::new( - Vector::new(
cursor_to_center.x * factor cursor_to_center.x * factor
/ (self.scaling * self.scaling), / (old_scaling * old_scaling),
cursor_to_center.y * factor cursor_to_center.y * factor
/ (self.scaling * self.scaling), / (old_scaling * old_scaling),
); );
} }
self.scaling = (self.scaling + factor)
.max(Self::MIN_SCALING)
.min(Self::MAX_SCALING);
self.cache.clear(); self.cache.clear();
} }