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Add a text blending test to the color test

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This commit is contained in:
Emil Ernerfeldt 2022-04-05 14:20:44 +02:00
parent a9ae8c3e2c
commit 68d5806b41
1 changed files with 36 additions and 6 deletions
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42
egui_demo_lib/src/apps/color_test.rs
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@ -148,7 +148,7 @@ impl ColorTest {
ui.separator(); ui.separator();
fine_line_test(ui); blending_and_feathering_test(ui);
} }
fn show_gradients(&mut self, ui: &mut Ui, bg_fill: Color32, (left, right): (Color32, Color32)) { fn show_gradients(&mut self, ui: &mut Ui, bg_fill: Color32, (left, right): (Color32, Color32)) {
@ -390,25 +390,55 @@ fn pixel_test(ui: &mut Ui) {
} }
} }
fn fine_line_test(ui: &mut Ui) { fn blending_and_feathering_test(ui: &mut Ui) {
ui.label("Some fine lines for testing anti-aliasing and blending:"); ui.label("Some fine lines for testing anti-aliasing and blending:");
let size = Vec2::new(256.0, 512.0); let size = Vec2::new(512.0, 512.0);
let (response, painter) = ui.allocate_painter(size, Sense::hover()); let (response, painter) = ui.allocate_painter(size, Sense::hover());
let rect = response.rect; let rect = response.rect;
let mut top_half = rect; let mut top_half = rect;
top_half.set_bottom(top_half.center().y); top_half.set_bottom(top_half.center().y);
painter.rect_filled(top_half, 0.0, Color32::BLACK); painter.rect_filled(top_half, 0.0, Color32::BLACK);
paint_fine_lines(&painter, top_half, Color32::WHITE); paint_fine_lines_and_text(&painter, top_half, Color32::WHITE);
let mut bottom_half = rect; let mut bottom_half = rect;
bottom_half.set_top(bottom_half.center().y); bottom_half.set_top(bottom_half.center().y);
painter.rect_filled(bottom_half, 0.0, Color32::WHITE); painter.rect_filled(bottom_half, 0.0, Color32::WHITE);
paint_fine_lines(&painter, bottom_half, Color32::BLACK); paint_fine_lines_and_text(&painter, bottom_half, Color32::BLACK);
} }
fn paint_fine_lines(painter: &egui::Painter, mut rect: Rect, color: Color32) { fn paint_fine_lines_and_text(painter: &egui::Painter, mut rect: Rect, color: Color32) {
{
let mut x = 0.0;
for opacity in [1.00, 0.50, 0.25, 0.10, 0.05, 0.02, 0.01, 0.00] {
painter.text(
rect.center_top() + Vec2::new(0.0, x),
Align2::LEFT_TOP,
format!("{:.0}% white", 100.0 * opacity),
FontId::proportional(16.0),
Color32::WHITE.linear_multiply(opacity),
);
painter.text(
rect.center_top() + Vec2::new(80.0, x),
Align2::LEFT_TOP,
format!("{:.0}% gray", 100.0 * opacity),
FontId::proportional(16.0),
Color32::GRAY.linear_multiply(opacity),
);
painter.text(
rect.center_top() + Vec2::new(160.0, x),
Align2::LEFT_TOP,
format!("{:.0}% black", 100.0 * opacity),
FontId::proportional(16.0),
Color32::BLACK.linear_multiply(opacity),
);
x += 20.0;
}
}
rect.max.x = rect.center().x;
rect = rect.shrink(12.0); rect = rect.shrink(12.0);
for width in [0.5, 1.0, 2.0] { for width in [0.5, 1.0, 2.0] {
painter.text( painter.text(