migrations/egui
1
0
Fork 0
mirror of https://github.com/emilk/egui.git synced 2026-08-30 13:20:05 -04:00
Code Activity

[emath] RectTransform: transforms Pos2 from one Rect to another

Browse Source 
Very useful for transforming coordinate systems, e.g. for painting
This commit is contained in:
Emil Ernerfeldt
2021-02-14 10:33:44 +01:00
parent dbc6a620cd
commit c376d0bb7e
8 changed files with 142 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
egui_demo_lib/src/apps/demo/dancing_strings.rs
View File

@@ -34,6 +34,9 @@ impl super::View for DancingStrings {
let desired_size = ui.available_width() * vec2(1.0, 0.35);
let (_id, rect) = ui.allocate_space(desired_size);
let to_screen =
math::RectTransform::from_to(Rect::from_x_y_ranges(0.0..=1.0, -1.0..=1.0), rect);
let mut shapes = vec![];
for &mode in &[2, 3, 5] {
@@ -46,11 +49,7 @@ impl super::View for DancingStrings {
let t = i as f32 / (n as f32);
let amp = (time as f32 * speed * mode).sin() / mode;
let y = amp * (t * std::f32::consts::TAU / 2.0 * mode).sin();
pos2(
lerp(rect.x_range(), t),
remap(y, -1.0..=1.0, rect.y_range()),
)
to_screen * pos2(t, y)
})
.collect();