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egui: implement basic interactive zooming

This commit is contained in:
Mikolaj Wielgus 2024-03-05 12:56:44 +00:00
parent 4689bc8e37
commit b43111030e
1 changed files with 14 additions and 4 deletions
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18
src/bin/topola-egui/app.rs
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@ -24,6 +24,9 @@ pub struct App {
#[serde(skip)]
design: Option<DsnDesign>,
#[serde(skip)]
zoom_factor: f32,
}
impl Default for App {
@ -33,6 +36,7 @@ impl Default for App {
label: "Hello World!".to_owned(),
file_handle_channel: channel(),
design: None,
zoom_factor: 1.0,
}
}
}
@ -107,8 +111,10 @@ impl eframe::App for App {
let desired_size = ui.available_width() * egui::vec2(1.0, 0.5);
let (_id, viewport_rect) = ui.allocate_space(desired_size);
self.zoom_factor = self.zoom_factor * ctx.input(|i| i.zoom_delta());
let transform = egui::emath::RectTransform::from_to(
egui::Rect::from_x_y_ranges(0.0..=1000.0, 0.0..=500.0),
egui::Rect::from_x_y_ranges(0.0..=1000.0, 0.0..=500.0) / self.zoom_factor,
viewport_rect,
);
let mut painter = Painter::new(ui, transform);
@ -116,14 +122,14 @@ impl eframe::App for App {
let dot_shape = Shape::Dot(DotShape {
c: Circle {
pos: [50.0, 100.0].into(),
r: 10.0,
r: 10.0 * self.zoom_factor as f64,
},
});
let seg_shape = Shape::Seg(SegShape {
from: [200.0, 25.0].into(),
to: [300.0, 300.0].into(),
width: 5.0,
width: 5.0 * self.zoom_factor as f64,
});
let bend_shape = Shape::Bend(BendShape {
@ -133,7 +139,7 @@ impl eframe::App for App {
pos: [130.0, 130.0].into(),
r: 30.0,
},
width: 12.0,
width: 12.0 * self.zoom_factor as f64,
});
painter.paint_shape(&dot_shape, egui::Color32::from_rgb(255, 0, 0));
@ -141,6 +147,10 @@ impl eframe::App for App {
painter.paint_shape(&bend_shape, egui::Color32::from_rgb(255, 255, 0));
})
});
if ctx.input(|i| i.key_pressed(egui::Key::Escape)) {
ctx.send_viewport_cmd(egui::ViewportCommand::Close);
}
}
}