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

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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
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19
egui_demo_lib/src/frame_history.rs
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@@ -58,7 +58,6 @@ impl FrameHistory {
fn graph(&mut self, ui: &mut egui::Ui) -> egui::Response {
use egui::*;
let graph_top_cpu_usage = 0.010;
ui.label("egui CPU usage history");
let history = &self.frame_times;
@@ -69,12 +68,17 @@ impl FrameHistory {
let (rect, response) = ui.allocate_at_least(size, Sense::hover());
let style = ui.style().noninteractive();
let mut shapes = vec![Shape::Rect {
let graph_top_cpu_usage = 0.010;
let graph_rect = Rect::from_x_y_ranges(history.max_age()..=0.0, graph_top_cpu_usage..=0.0);
let to_screen = emath::RectTransform::from_to(graph_rect, rect);
let mut shapes = Vec::with_capacity(3 + 2 * history.len());
shapes.push(Shape::Rect {
rect,
corner_radius: style.corner_radius,
fill: ui.visuals().extreme_bg_color,
stroke: ui.style().noninteractive().bg_stroke,
}];
});
let rect = rect.shrink(4.0);
let color = ui.visuals().text_color();
@@ -87,7 +91,7 @@ impl FrameHistory {
[pos2(rect.left(), y), pos2(rect.right(), y)],
line_stroke,
));
let cpu_usage = remap(y, rect.bottom_up_range(), 0.0..=graph_top_cpu_usage);
let cpu_usage = to_screen.inverse().transform_pos(pointer_pos).y;
let text = format!("{:.1} ms", 1e3 * cpu_usage);
shapes.push(Shape::text(
ui.fonts(),
@@ -106,16 +110,15 @@ impl FrameHistory {
for (time, cpu_usage) in history.iter() {
let age = (right_side_time - time) as f32;
let x = remap(age, history.max_age()..=0.0, rect.x_range());
let y = remap_clamp(cpu_usage, 0.0..=graph_top_cpu_usage, rect.bottom_up_range());
let pos = to_screen.transform_pos_clamped(Pos2::new(age, cpu_usage));
shapes.push(Shape::line_segment(
[pos2(x, rect.bottom()), pos2(x, y)],
[pos2(pos.x, rect.bottom()), pos],
line_stroke,
));
if cpu_usage < graph_top_cpu_usage {
shapes.push(Shape::circle_filled(pos2(x, y), radius, circle_color));
shapes.push(Shape::circle_filled(pos, radius, circle_color));
}
}