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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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30
crates/egui_plot/src/lib.rs
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@@ -1002,6 +1002,10 @@ impl Plot {
auto_bounds = false.into();
}
BoundsModification::AutoBounds(new_auto_bounds) => auto_bounds = new_auto_bounds,
BoundsModification::Zoom(zoom_factor, center) => {
bounds.zoom(zoom_factor, center);
auto_bounds = false.into();
}
}
}
@@ -1341,6 +1345,7 @@ enum BoundsModification {
Set(PlotBounds),
Translate(Vec2),
AutoBounds(Vec2b),
Zoom(Vec2, PlotPoint),
}
/// Provides methods to interact with a plot while building it. It is the single argument of the closure
@@ -1404,6 +1409,31 @@ impl PlotUi {
&self.response
}
/// Scale the plot bounds around a position in screen coordinates.
///
/// Can be useful for implementing alternative plot navigation methods.
///
/// The plot bounds are divided by `zoom_factor`, therefore:
/// - `zoom_factor < 1.0` zooms out, i.e., increases the visible range to show more data.
/// - `zoom_factor > 1.0` zooms in, i.e., reduces the visible range to show more detail.
pub fn zoom_bounds(&mut self, zoom_factor: Vec2, center: PlotPoint) {
self.bounds_modifications
.push(BoundsModification::Zoom(zoom_factor, center));
}
/// Scale the plot bounds around the hovered position, if any.
///
/// Can be useful for implementing alternative plot navigation methods.
///
/// The plot bounds are divided by `zoom_factor`, therefore:
/// - `zoom_factor < 1.0` zooms out, i.e., increases the visible range to show more data.
/// - `zoom_factor > 1.0` zooms in, i.e., reduces the visible range to show more detail.
pub fn zoom_bounds_around_hovered(&mut self, zoom_factor: Vec2) {
if let Some(hover_pos) = self.pointer_coordinate() {
self.zoom_bounds(zoom_factor, hover_pos);
}
}
/// The pointer position in plot coordinates. Independent of whether the pointer is in the plot area.
pub fn pointer_coordinate(&self) -> Option<PlotPoint> {
// We need to subtract the drag delta to keep in sync with the frame-delayed screen transform: