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topola
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sdl2-demo: add zooming/panning

This commit is contained in:
Tomasz Cichoń 2024-03-08 08:55:30 +01:00
parent ada12b32fd
commit fb6922a5e5
1 changed files with 33 additions and 4 deletions
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37
src/bin/topola-sdl2-demo/main.rs
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@ -31,10 +31,8 @@ use sdl2::keyboard::Keycode;
use sdl2::video::{GLProfile, Window};
use sdl2::EventPump;
use pathfinder_canvas::{ArcDirection, CanvasRenderingContext2D, ColorU, FillRule};
use pathfinder_canvas::{Canvas, CanvasFontContext, Path2D};
use pathfinder_geometry::rect::RectF;
use pathfinder_geometry::vector::{vec2f, vec2i};
use pathfinder_canvas::{Canvas, CanvasFontContext, ColorU};
use pathfinder_geometry::vector::{vec2f, vec2i, Vector2F};
use pathfinder_gl::{GLDevice, GLVersion};
use pathfinder_renderer::concurrent::rayon::RayonExecutor;
use pathfinder_renderer::concurrent::scene_proxy::SceneProxy;
@ -102,6 +100,7 @@ struct DebugRouterObserver<'a> {
window: &'a Window,
renderer: &'a mut Renderer<GLDevice>,
font_context: &'a CanvasFontContext,
view: &'a mut View,
}
impl<'a> DebugRouterObserver<'a> {
@ -110,12 +109,14 @@ impl<'a> DebugRouterObserver<'a> {
window: &'a Window,
renderer: &'a mut Renderer<GLDevice>,
font_context: &'a CanvasFontContext,
view: &'a mut View,
) -> Self {
Self {
event_pump,
window,
renderer,
font_context,
view,
}
}
}
@ -127,6 +128,7 @@ impl<'a, R: RulesTrait> RouterObserverTrait<R> for DebugRouterObserver<'a> {
self.window,
self.renderer,
self.font_context,
self.view,
RouterOrLayout::Layout(tracer.board.layout()),
None,
Some(tracer.mesh.clone()),
@ -145,6 +147,7 @@ impl<'a, R: RulesTrait> RouterObserverTrait<R> for DebugRouterObserver<'a> {
self.window,
self.renderer,
self.font_context,
self.view,
RouterOrLayout::Layout(tracer.board.layout()),
None,
Some(tracer.mesh.clone()),
@ -176,6 +179,7 @@ impl<'a, R: RulesTrait> RouterObserverTrait<R> for DebugRouterObserver<'a> {
self.window,
self.renderer,
self.font_context,
self.view,
RouterOrLayout::Layout(tracer.board.layout()),
None,
Some(tracer.mesh.clone()),
@ -254,11 +258,14 @@ fn main() -> Result<(), anyhow::Error> {
let board = Board::new(layout);
let mut router = Router::new(board);
let mut view = View { pan: vec2f(-400.0, -300.0), zoom: 0.5 };
render_times(
&mut event_pump,
&window,
&mut renderer,
&font_context,
&mut view,
RouterOrLayout::Layout(router.board.layout()),
None,
None,
@ -282,6 +289,7 @@ fn main() -> Result<(), anyhow::Error> {
&window,
&mut renderer,
&font_context,
&mut view,
RouterOrLayout::Layout(router.board.layout()),
None,
None,
@ -294,11 +302,17 @@ fn main() -> Result<(), anyhow::Error> {
Ok(())
}
struct View {
pan: Vector2F,
zoom: f32,
}
fn render_times(
event_pump: &mut EventPump,
window: &Window,
renderer: &mut Renderer<GLDevice>,
font_context: &CanvasFontContext,
view: &mut View,
mut router_or_layout: RouterOrLayout<impl RulesTrait>,
maybe_band: Option<BandIndex>,
mut maybe_mesh: Option<Mesh>,
@ -317,6 +331,14 @@ fn render_times(
keycode: Some(Keycode::Escape),
..
} => break 'running,
Event::MouseWheel { y, .. } => {
view.zoom *= f32::powf(1.4, y as f32);
},
Event::MouseMotion { xrel, yrel, mousestate, .. } => {
if mousestate.left() {
view.pan += vec2f(xrel as f32, yrel as f32) / view.zoom;
}
},
_ => {}
}
}
@ -326,6 +348,12 @@ fn render_times(
let window_size = window.size();
let mut canvas = Canvas::new(vec2f(window_size.0 as f32, window_size.1 as f32))
.get_context_2d(font_context.clone());
let center = vec2f(400.0, 300.0);
canvas.translate(center);
canvas.scale(vec2f(view.zoom, view.zoom));
canvas.translate(-center + view.pan);
let mut painter = Painter::new(&mut canvas);
let layout = match router_or_layout {
@ -343,6 +371,7 @@ fn render_times(
window,
renderer,
font_context,
view,
),
)
.ok();