Adding rotation to text

demo/src/plot_demo.rs

@@ -1,11 +1,12 @@
-use std::f64::consts::TAU;
-use std::ops::RangeInclusive;
-
+use eframe::emath::Align2;
 use egui::{
     Color32, ComboBox, NumExt as _, Pos2, Response, ScrollArea, Stroke, TextWrapMode, Vec2b,
     WidgetInfo, WidgetType, remap, vec2,
 };
 
+use std::f64::consts::TAU;
+use std::ops::RangeInclusive;
+
 use egui_plot::{
     Arrows, AxisHints, Bar, BarChart, BoxElem, BoxPlot, BoxSpread, CoordinatesFormatter, Corner,
     GridInput, GridMark, HLine, Legend, Line, LineStyle, MarkerShape, Plot, PlotImage, PlotPoint,
@@ -819,6 +820,13 @@ impl ItemsDemo {
             plot_ui.points(points.name("Points with stems").id("points_with_stems"));
             plot_ui.text(Text::new("Text", PlotPoint::new(-3.0, -3.0), "wow").id("text0"));
             plot_ui.text(Text::new("Text", PlotPoint::new(-2.0, 2.5), "so graph").id("text1"));
+            plot_ui.text(
+                Text::new("Text", PlotPoint::new(-1.5, 2.0), "Very angle")
+                    .angle(-std::f32::consts::FRAC_PI_4)
+                    .anchor(Align2::LEFT_TOP)
+                    .name("Angled text")
+                    .id("text_angled"),
+            );
             plot_ui.text(Text::new("Text", PlotPoint::new(3.0, 3.0), "much color").id("text2"));
             plot_ui.text(Text::new("Text", PlotPoint::new(2.5, -2.0), "such plot").id("text3"));
             plot_ui.image(image.name("Image"));

egui_plot/src/items/mod.rs

@@ -656,6 +656,7 @@ pub struct Text {
     pub(super) position: PlotPoint,
     pub(super) color: Color32,
     pub(super) anchor: Align2,
+    pub(super) angle: f32,
 }
 
 impl Text {
@@ -666,6 +667,7 @@ impl Text {
             position,
             color: Color32::TRANSPARENT,
             anchor: Align2::CENTER_CENTER,
+            angle: 0.0,
         }
     }
 
@@ -676,6 +678,15 @@ impl Text {
         self
     }
 
+    /// Sets the text rotation angle.  Angles are defined in radians, with positive values
+    /// resulting in a clockwise direction.  Rotations are performed about the center of the
+    /// bounding box.
+    #[inline]
+    pub fn angle(mut self, angle: f32) -> Self {
+        self.angle = angle;
+        self
+    }
+
     /// Anchor position of the text. Default is `Align2::CENTER_CENTER`.
     #[inline]
     pub fn anchor(mut self, anchor: Align2) -> Self {
@@ -704,7 +715,11 @@ impl PlotItem for Text {
         let pos = transform.position_from_point(&self.position);
         let rect = self.anchor.anchor_size(pos, galley.size());
 
-        shapes.push(TextShape::new(rect.min, galley, color).into());
+        shapes.push(
+            TextShape::new(rect.min, galley, color)
+                .with_angle_and_anchor(self.angle, Align2::CENTER_CENTER)
+                .into(),
+        );
 
         if self.base.highlight {
             shapes.push(Shape::rect_stroke(