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[test_scenes] Port longpathdash test case from Skia
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This is a single very long path that results in a large number of
line segments when dashing is applied. This demonstrates rendering
artifacts.
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armansito committed Oct 6, 2023
1 parent 34483eb commit 2af65bc
Showing 1 changed file with 40 additions and 0 deletions.
40 changes: 40 additions & 0 deletions examples/scenes/src/test_scenes.rs
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,7 @@ pub fn test_scenes() -> SceneSet {
mmark_scene,
scene!(funky_paths),
scene!(cardioid_and_friends),
scene!(longpathdash),
scene!(animated_text: animated),
scene!(gradient_extend),
scene!(two_point_radial),
Expand Down Expand Up @@ -107,6 +108,45 @@ fn cardioid_and_friends(sb: &mut SceneBuilder, _: &mut SceneParams) {
//render_tiger(sb, false);
}

fn longpathdash(sb: &mut SceneBuilder, _: &mut SceneParams) {
use PathEl::*;
let mut path = BezPath::new();
let mut x = 32;
while x < 256 {
let mut a: f64 = 0.0;
while a < 3.141592 * 2.0 {
let pts = [
(256.0 + a.sin() * x as f64, 256.0 + a.cos() * x as f64),
(
256.0 + (a + 3.141592 / 3.0).sin() * (x + 64) as f64,
256.0 + (a + 3.141592 / 3.0).cos() * (x + 64) as f64,
),
];
path.push(MoveTo(pts[0].into()));
let mut i: f64 = 0.0;
while i < 1.0 {
path.push(LineTo(
(
pts[0].0 * (1.0 - i) + pts[1].0 * i,
pts[0].1 * (1.0 - i) + pts[1].1 * i,
)
.into(),
));
i += 0.05;
}
a += 0.03141592
}
x += 16;
}
sb.stroke(
&Stroke::new(1.0).with_dashes(0.0, [1.0, 1.0]),
Affine::translate((50.0, 50.0)),
Color::rgb8(255, 255, 0),
None,
&path,
);
}

fn animated_text(sb: &mut SceneBuilder, params: &mut SceneParams) {
// Uses the static array address as a cache key for expedience. Real code
// should use a better strategy.
Expand Down

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