migrations/egui
1
0
Fork 0
mirror of https://github.com/emilk/egui.git synced 2026-06-28 07:23:13 -04:00
Code Activity

Faster dashed line generation (#1027)

Browse Source 
* Faster dashed lines generation

* Add dashed_line benchmark
This commit is contained in:
Lampsitter
2022-01-06 10:44:53 +01:00
committed by GitHub
parent 79cfdaa1f9
commit d31f7d6522
5 changed files with 71 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
epaint/src/shape.rs
View File

@@ -75,6 +75,18 @@ impl Shape {
shapes
}
/// Turn a line into dashes. If you need to create many dashed lines use this instead of
/// [`Self::dashed_line`]
pub fn dashed_line_many(
points: &[Pos2],
stroke: impl Into<Stroke>,
dash_length: f32,
gap_length: f32,
shapes: &mut Vec<Shape>,
) {
dashes_from_line(points, stroke.into(), dash_length, gap_length, shapes);
}
/// A convex polygon with a fill and optional stroke.
#[inline]
pub fn convex_polygon(
@@ -425,27 +437,27 @@ fn dashes_from_line(
let end = window[1];
let vector = end - start;
let segment_length = vector.length();
let mut start_point = start;
while position_on_segment < segment_length {
let new_point = start + vector * (position_on_segment / segment_length);
if drawing_dash {
// This is the end point.
if let Shape::Path(PathShape { points, .. }) = shapes.last_mut().unwrap() {
points.push(new_point);
}
shapes.push(Shape::line_segment([start_point, new_point], stroke));
position_on_segment += gap_length;
} else {
// Start a new dash.
shapes.push(Shape::line(vec![new_point], stroke));
start_point = new_point;
position_on_segment += dash_length;
}
drawing_dash = !drawing_dash;
}
// If the segment ends and the dash is not finished, add the segment's end point.
if drawing_dash {
if let Shape::Path(PathShape { points, .. }) = shapes.last_mut().unwrap() {
points.push(end);
}
shapes.push(Shape::line_segment([start_point, end], stroke));
}
position_on_segment -= segment_length;
});
}