31fa414422
Release Notes: - N/A --- Continue https://github.com/zed-industries/zed/pull/20499 We to draw more complex Path. Before this change, we only have `line_to`, but it is not enough. Add a new `PathBuilder` to use [lyon](https://github.com/nical/lyon) to build more complex path. And then with PR #22812 to enable anti-aliasing, all thing will be perfect. ## Show case ```bash cargo run -p gpui --example painting ``` Before: <img width="1136" alt="image" src="https://github.com/user-attachments/assets/0c15833a-ec95-404c-a469-24cf172cfd86" /> After: <img width="1136" alt="image" src="https://github.com/user-attachments/assets/42cfa35e-7e8f-4ef3-bb2d-b98defc62ad6" />
240 lines
8.8 KiB
Rust
240 lines
8.8 KiB
Rust
use gpui::{
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canvas, div, linear_color_stop, linear_gradient, point, prelude::*, px, rgb, size, Application,
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Background, Bounds, ColorSpace, Context, MouseDownEvent, Path, PathBuilder, PathStyle, Pixels,
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Point, Render, StrokeOptions, Window, WindowOptions,
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};
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struct PaintingViewer {
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default_lines: Vec<(Path<Pixels>, Background)>,
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lines: Vec<Vec<Point<Pixels>>>,
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start: Point<Pixels>,
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_painting: bool,
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}
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impl PaintingViewer {
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fn new(_window: &mut Window, _cx: &mut Context<Self>) -> Self {
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let mut lines = vec![];
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// draw a Rust logo
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let mut builder = lyon::path::Path::svg_builder();
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lyon::extra::rust_logo::build_logo_path(&mut builder);
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// move down the Path
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let mut builder: PathBuilder = builder.into();
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builder.translate(point(px(10.), px(100.)));
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builder.scale(0.9);
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let path = builder.build().unwrap();
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lines.push((path, gpui::black().into()));
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// draw a lightening bolt ⚡
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let mut builder = PathBuilder::fill();
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builder.move_to(point(px(150.), px(200.)));
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builder.line_to(point(px(200.), px(125.)));
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builder.line_to(point(px(200.), px(175.)));
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builder.line_to(point(px(250.), px(100.)));
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let path = builder.build().unwrap();
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lines.push((path, rgb(0x1d4ed8).into()));
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// draw a ⭐
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let mut builder = PathBuilder::fill();
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builder.move_to(point(px(350.), px(100.)));
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builder.line_to(point(px(370.), px(160.)));
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builder.line_to(point(px(430.), px(160.)));
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builder.line_to(point(px(380.), px(200.)));
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builder.line_to(point(px(400.), px(260.)));
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builder.line_to(point(px(350.), px(220.)));
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builder.line_to(point(px(300.), px(260.)));
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builder.line_to(point(px(320.), px(200.)));
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builder.line_to(point(px(270.), px(160.)));
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builder.line_to(point(px(330.), px(160.)));
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builder.line_to(point(px(350.), px(100.)));
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let path = builder.build().unwrap();
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lines.push((
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path,
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linear_gradient(
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180.,
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linear_color_stop(rgb(0xFACC15), 0.7),
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linear_color_stop(rgb(0xD56D0C), 1.),
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)
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.color_space(ColorSpace::Oklab),
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));
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let square_bounds = Bounds {
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origin: point(px(450.), px(100.)),
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size: size(px(200.), px(80.)),
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};
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let height = square_bounds.size.height;
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let horizontal_offset = height;
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let vertical_offset = px(30.);
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let mut builder = PathBuilder::fill();
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builder.move_to(square_bounds.bottom_left());
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builder.curve_to(
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square_bounds.origin + point(horizontal_offset, vertical_offset),
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square_bounds.origin + point(px(0.0), vertical_offset),
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);
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builder.line_to(square_bounds.top_right() + point(-horizontal_offset, vertical_offset));
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builder.curve_to(
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square_bounds.bottom_right(),
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square_bounds.top_right() + point(px(0.0), vertical_offset),
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);
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builder.line_to(square_bounds.bottom_left());
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let path = builder.build().unwrap();
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lines.push((
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path,
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linear_gradient(
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180.,
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linear_color_stop(gpui::blue(), 0.4),
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linear_color_stop(gpui::red(), 1.),
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),
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));
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// draw a wave
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let options = StrokeOptions::default()
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.with_line_width(1.)
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.with_line_join(lyon::path::LineJoin::Bevel);
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let mut builder = PathBuilder::stroke(px(1.)).with_style(PathStyle::Stroke(options));
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builder.move_to(point(px(40.), px(320.)));
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for i in 0..50 {
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builder.line_to(point(
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px(40.0 + i as f32 * 10.0),
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px(320.0 + (i as f32 * 10.0).sin() * 40.0),
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));
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}
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let path = builder.build().unwrap();
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lines.push((path, gpui::green().into()));
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Self {
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default_lines: lines.clone(),
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lines: vec![],
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start: point(px(0.), px(0.)),
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_painting: false,
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}
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}
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fn clear(&mut self, cx: &mut Context<Self>) {
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self.lines.clear();
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cx.notify();
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}
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}
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impl Render for PaintingViewer {
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fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
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let default_lines = self.default_lines.clone();
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let lines = self.lines.clone();
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div()
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.font_family(".SystemUIFont")
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.bg(gpui::white())
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.size_full()
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.p_4()
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.flex()
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.flex_col()
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.child(
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div()
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.flex()
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.gap_2()
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.justify_between()
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.items_center()
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.child("Mouse down any point and drag to draw lines (Hold on shift key to draw straight lines)")
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.child(
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div()
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.id("clear")
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.child("Clean up")
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.bg(gpui::black())
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.text_color(gpui::white())
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.active(|this| this.opacity(0.8))
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.flex()
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.px_3()
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.py_1()
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.on_click(cx.listener(|this, _, _, cx| {
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this.clear(cx);
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})),
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),
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)
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.child(
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div()
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.size_full()
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.child(
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canvas(
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move |_, _, _| {},
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move |_, _, window, _| {
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for (path, color) in default_lines {
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window.paint_path(path, color);
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}
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for points in lines {
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if points.len() < 2 {
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continue;
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}
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let mut builder = PathBuilder::stroke(px(1.));
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for (i, p) in points.into_iter().enumerate() {
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if i == 0 {
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builder.move_to(p);
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} else {
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builder.line_to(p);
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}
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}
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if let Ok(path) = builder.build() {
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window.paint_path(path, gpui::black());
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}
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}
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},
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)
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.size_full(),
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)
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.on_mouse_down(
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gpui::MouseButton::Left,
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cx.listener(|this, ev: &MouseDownEvent, _, _| {
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this._painting = true;
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this.start = ev.position;
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let path = vec![ev.position];
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this.lines.push(path);
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}),
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)
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.on_mouse_move(cx.listener(|this, ev: &gpui::MouseMoveEvent, _, cx| {
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if !this._painting {
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return;
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}
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let is_shifted = ev.modifiers.shift;
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let mut pos = ev.position;
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// When holding shift, draw a straight line
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if is_shifted {
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let dx = pos.x - this.start.x;
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let dy = pos.y - this.start.y;
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if dx.abs() > dy.abs() {
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pos.y = this.start.y;
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} else {
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pos.x = this.start.x;
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}
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}
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if let Some(path) = this.lines.last_mut() {
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path.push(pos);
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}
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cx.notify();
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}))
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.on_mouse_up(
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gpui::MouseButton::Left,
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cx.listener(|this, _, _, _| {
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this._painting = false;
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}),
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),
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)
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}
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}
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fn main() {
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Application::new().run(|cx| {
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cx.open_window(
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WindowOptions {
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focus: true,
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..Default::default()
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},
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|window, cx| cx.new(|cx| PaintingViewer::new(window, cx)),
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)
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.unwrap();
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cx.activate(true);
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});
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}
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