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Plot custom zoom (#2714)

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- Added methods to zoom the plot programmatically, to match the
previously added `translate_bounds()`.
- Added an example of how this method can be used to customize the plot
navigation.

Closes #1164.
This commit is contained in:
YgorSouza
2024-01-06 22:34:42 +01:00
committed by GitHub
parent 797406de39
commit 5ed2c0aa90
6 changed files with 201 additions and 4 deletions
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12
crates/egui_plot/src/transform.rs
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@@ -150,6 +150,13 @@ impl PlotBounds {
self.translate_y(delta.y as f64);
}
pub(crate) fn zoom(&mut self, zoom_factor: Vec2, center: PlotPoint) {
self.min[0] = center.x + (self.min[0] - center.x) / (zoom_factor.x as f64);
self.max[0] = center.x + (self.max[0] - center.x) / (zoom_factor.x as f64);
self.min[1] = center.y + (self.min[1] - center.y) / (zoom_factor.y as f64);
self.max[1] = center.y + (self.max[1] - center.y) / (zoom_factor.y as f64);
}
pub(crate) fn add_relative_margin_x(&mut self, margin_fraction: Vec2) {
let width = self.width().max(0.0);
self.expand_x(margin_fraction.x as f64 * width);
@@ -255,10 +262,7 @@ impl PlotTransform {
let center = self.value_from_position(center);
let mut new_bounds = self.bounds;
new_bounds.min[0] = center.x + (new_bounds.min[0] - center.x) / (zoom_factor.x as f64);
new_bounds.max[0] = center.x + (new_bounds.max[0] - center.x) / (zoom_factor.x as f64);
new_bounds.min[1] = center.y + (new_bounds.min[1] - center.y) / (zoom_factor.y as f64);
new_bounds.max[1] = center.y + (new_bounds.max[1] - center.y) / (zoom_factor.y as f64);
new_bounds.zoom(zoom_factor, center);
if new_bounds.is_valid() {
self.bounds = new_bounds;