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Canvas: the art texture's quads and the transparency grid share one textured-quad helper

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bflatastic committed 2026-10-14 06:01:10 +07:00
1 parent b3ac169f00
commit 841ea1716d
1 file changed
+9 -17
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crates/ui-egui/src/canvas.rs
+9 -17
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@@ -345,14 +345,7 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
match k.pixel {
// Document pixels: placed over the document rect they cover, turning with the view.
Some([x0, y0, x1, y1]) => {
let q = xf.quad(Rect::new(x0 as f64, y0 as f64, x1 as f64, y1 as f64));
let mut mesh = egui::Mesh::with_texture(tex.id());
for (pos, uv) in q.into_iter().zip([pos2(0.0, 0.0), pos2(1.0, 0.0), pos2(1.0, 1.0), pos2(0.0, 1.0)]) {
mesh.vertices.push(egui::epaint::Vertex { pos, uv, color: Color32::WHITE });
}
mesh.add_triangle(0, 1, 2);
mesh.add_triangle(0, 2, 3);
painter.add(Shape::mesh(mesh));
textured_quad(&painter, tex.id(), &xf.quad(Rect::new(x0 as f64, y0 as f64, x1 as f64, y1 as f64)), (1.0, 1.0));
}
None if (k.rot - v.rotation).abs() < 1e-9 => {
// Reproject the last frame if it was rendered for a different view.
@@ -367,13 +360,7 @@ pub fn show(app: &mut VectorcraftApp, ui: &mut Ui) {
None => {
let old = Xf { rect, zoom: k.zoom, center: Point::new(k.cx, k.cy), rot: k.rot.to_radians() };
let q = [rect.left_top(), rect.right_top(), rect.right_bottom(), rect.left_bottom()].map(|c| xf.to_screen(old.to_doc(c)));
let mut mesh = egui::Mesh::with_texture(tex.id());
for (pos, uv) in q.into_iter().zip([pos2(0.0, 0.0), pos2(1.0, 0.0), pos2(1.0, 1.0), pos2(0.0, 1.0)]) {
mesh.vertices.push(egui::epaint::Vertex { pos, uv, color: Color32::WHITE });
}
mesh.add_triangle(0, 1, 2);
mesh.add_triangle(0, 2, 3);
painter.add(Shape::mesh(mesh));
textured_quad(&painter, tex.id(), &q, (1.0, 1.0));
}
}
}
@@ -999,10 +986,15 @@ pub(crate) const TRANSPARENCY_GRID: &str = "transparency grid";
/// The transparency grid over the artboard `ab` (screen corners `quad`): one textured quad whose
/// cells stay `cell` screen points at every zoom and turn with a rotated view.
fn checker(p: &egui::Painter, quad: &[Pos2], ab: Rect, zoom: f64, tex: egui::TextureId, cell: f32) {
let mut mesh = egui::Mesh::with_texture(tex);
// Two cells per texture repeat.
let per = (2.0 * cell as f64 / zoom).max(1e-9);
let (u, v) = ((ab.width() / per) as f32, (ab.height() / per) as f32);
textured_quad(p, tex, quad, ((ab.width() / per) as f32, (ab.height() / per) as f32));
}
/// One quad drawn with `tex`: its corners `quad` (from the top left, clockwise) show the texture
/// from (0, 0) to (`u`, `v`).
fn textured_quad(p: &egui::Painter, tex: egui::TextureId, quad: &[Pos2], (u, v): (f32, f32)) {
let mut mesh = egui::Mesh::with_texture(tex);
for (pos, uv) in quad.iter().zip([pos2(0.0, 0.0), pos2(u, 0.0), pos2(u, v), pos2(0.0, v)]) {
mesh.vertices.push(egui::epaint::Vertex { pos: *pos, uv, color: Color32::WHITE });
}