Improved plot interaction methods (#892)

ctx plot_bounds plot_hovered screen_from_plot plot_from_screen etc

CHANGELOG.md

@@ -12,7 +12,9 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui_w
 * You can now read and write the cursor of a `TextEdit` ([#848](https://github.com/emilk/egui/pull/848)).
 * Most widgets containing text (`Label`, `Button` etc) now supports rich text ([#855](https://github.com/emilk/egui/pull/855)).
 * When using a custom font you can now specify a font index ([#873](https://github.com/emilk/egui/pull/873)).
-* You can now read the plot coordinates of the mouse when building a `Plot` ([#766](https://github.com/emilk/egui/pull/766)).
+* You can now query information about the plot (e.g. get the mouse position in plot coordinates, or the plot
+  bounds) while adding items. `Plot` ([#766](https://github.com/emilk/egui/pull/766) and
+  [#892](https://github.com/emilk/egui/pull/892)).
 * Add vertical sliders with `Slider::new(…).vertical()` ([#875](https://github.com/emilk/egui/pull/875)).
 * Add `Button::image_and_text` ([#832](https://github.com/emilk/egui/pull/832)).
 
@@ -36,7 +38,7 @@ NOTE: [`epaint`](epaint/CHANGELOG.md), [`eframe`](eframe/CHANGELOG.md), [`egui_w
 * [5225225](https://github.com/5225225): ([#849](https://github.com/emilk/egui/pull/849)).
 * [B-Reif](https://github.com/B-Reif) ([#875](https://github.com/emilk/egui/pull/875)).
 * [d10sfan](https://github.com/d10sfan) ([#832](https://github.com/emilk/egui/pull/832)).
-* [EmbersArc](https://github.com/EmbersArc): ([#766](https://github.com/emilk/egui/pull/766)).
+* [EmbersArc](https://github.com/EmbersArc): ([#766](https://github.com/emilk/egui/pull/766), [#892](https://github.com/emilk/egui/pull/892)).
 * [mankinskin](https://github.com/mankinskin) ([#543](https://github.com/emilk/egui/pull/543)).
 * [sumibi-yakitori](https://github.com/sumibi-yakitori) ([#830](https://github.com/emilk/egui/pull/830)).
 * [t18b219k](https://github.com/t18b219k): ([#868](https://github.com/emilk/egui/pull/868), [#888](https://github.com/emilk/egui/pull/888)).

egui/src/widgets/plot/items.rs

@@ -4,7 +4,7 @@ use std::ops::{Bound, RangeBounds, RangeInclusive};
 
 use epaint::Mesh;
 
-use super::transform::{Bounds, ScreenTransform};
+use super::transform::{PlotBounds, ScreenTransform};
 use crate::*;
 
 const DEFAULT_FILL_ALPHA: f32 = 0.05;
@@ -233,8 +233,8 @@ impl PlotItem for HLine {
         None
     }
 
-    fn get_bounds(&self) -> Bounds {
-        let mut bounds = Bounds::NOTHING;
+    fn get_bounds(&self) -> PlotBounds {
+        let mut bounds = PlotBounds::NOTHING;
         bounds.min[1] = self.y;
         bounds.max[1] = self.y;
         bounds
@@ -343,8 +343,8 @@ impl PlotItem for VLine {
         None
     }
 
-    fn get_bounds(&self) -> Bounds {
-        let mut bounds = Bounds::NOTHING;
+    fn get_bounds(&self) -> PlotBounds {
+        let mut bounds = PlotBounds::NOTHING;
         bounds.min[0] = self.x;
         bounds.max[0] = self.x;
         bounds
@@ -360,7 +360,7 @@ pub(super) trait PlotItem {
     fn highlight(&mut self);
     fn highlighted(&self) -> bool;
     fn values(&self) -> Option<&Values>;
-    fn get_bounds(&self) -> Bounds;
+    fn get_bounds(&self) -> PlotBounds;
 }
 
 // ----------------------------------------------------------------------------
@@ -503,8 +503,8 @@ impl Values {
         (start < end).then(|| start..=end)
     }
 
-    pub(super) fn get_bounds(&self) -> Bounds {
-        let mut bounds = Bounds::NOTHING;
+    pub(super) fn get_bounds(&self) -> PlotBounds {
+        let mut bounds = PlotBounds::NOTHING;
         self.values
             .iter()
             .for_each(|value| bounds.extend_with(value));
@@ -710,7 +710,7 @@ impl PlotItem for Line {
         Some(&self.series)
     }
 
-    fn get_bounds(&self) -> Bounds {
+    fn get_bounds(&self) -> PlotBounds {
         self.series.get_bounds()
     }
 }
@@ -840,7 +840,7 @@ impl PlotItem for Polygon {
         Some(&self.series)
     }
 
-    fn get_bounds(&self) -> Bounds {
+    fn get_bounds(&self) -> PlotBounds {
         self.series.get_bounds()
     }
 }
@@ -953,8 +953,8 @@ impl PlotItem for Text {
         None
     }
 
-    fn get_bounds(&self) -> Bounds {
-        let mut bounds = Bounds::NOTHING;
+    fn get_bounds(&self) -> PlotBounds {
+        let mut bounds = PlotBounds::NOTHING;
         bounds.extend_with(&self.position);
         bounds
     }
@@ -1186,7 +1186,7 @@ impl PlotItem for Points {
         Some(&self.series)
     }
 
-    fn get_bounds(&self) -> Bounds {
+    fn get_bounds(&self) -> PlotBounds {
         self.series.get_bounds()
     }
 }
@@ -1301,7 +1301,7 @@ impl PlotItem for Arrows {
         Some(&self.origins)
     }
 
-    fn get_bounds(&self) -> Bounds {
+    fn get_bounds(&self) -> PlotBounds {
         self.origins.get_bounds()
     }
 }
@@ -1431,8 +1431,8 @@ impl PlotItem for PlotImage {
         None
     }
 
-    fn get_bounds(&self) -> Bounds {
-        let mut bounds = Bounds::NOTHING;
+    fn get_bounds(&self) -> PlotBounds {
+        let mut bounds = PlotBounds::NOTHING;
         let left_top = Value::new(
             self.position.x as f32 - self.size.x / 2.0,
             self.position.y as f32 - self.size.y / 2.0,