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egui: implement moving the canvas horizontally and vertically

This commit is contained in:
Mikolaj Wielgus 2024-03-05 18:51:17 +00:00
parent b43111030e
commit 4959f3512b
2 changed files with 14 additions and 13 deletions
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18
src/bin/topola-egui/app.rs
View File

@ -26,7 +26,7 @@ pub struct App {
design: Option<DsnDesign>,
#[serde(skip)]
zoom_factor: f32,
from_rect: egui::emath::Rect,
}
impl Default for App {
@ -36,7 +36,7 @@ impl Default for App {
label: "Hello World!".to_owned(),
file_handle_channel: channel(),
design: None,
zoom_factor: 1.0,
from_rect: egui::Rect::from_x_y_ranges(0.0..=1000.0, 0.0..=500.0),
}
}
}
@ -111,25 +111,23 @@ 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());
self.from_rect = self.from_rect.translate(ctx.input(|i| -i.raw_scroll_delta));
self.from_rect = self.from_rect / 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) / self.zoom_factor,
viewport_rect,
);
let transform = egui::emath::RectTransform::from_to(self.from_rect, viewport_rect);
let mut painter = Painter::new(ui, transform);
let dot_shape = Shape::Dot(DotShape {
c: Circle {
pos: [50.0, 100.0].into(),
r: 10.0 * self.zoom_factor as f64,
r: 10.0,
},
});
let seg_shape = Shape::Seg(SegShape {
from: [200.0, 25.0].into(),
to: [300.0, 300.0].into(),
width: 5.0 * self.zoom_factor as f64,
width: 5.0,
});
let bend_shape = Shape::Bend(BendShape {
@ -139,7 +137,7 @@ impl eframe::App for App {
pos: [130.0, 130.0].into(),
r: 30.0,
},
width: 12.0 * self.zoom_factor as f64,
width: 12.0,
});
painter.paint_shape(&dot_shape, egui::Color32::from_rgb(255, 0, 0));

9
src/bin/topola-egui/painter.rs
View File

@ -17,7 +17,7 @@ impl<'a> Painter<'a> {
Shape::Dot(dot) => epaint::Shape::circle_filled(
self.transform
.transform_pos([dot.c.pos.x() as f32, dot.c.pos.y() as f32].into()),
dot.c.r as f32,
dot.c.r as f32 * self.transform.scale().x,
color,
),
Shape::Seg(seg) => epaint::Shape::line_segment(
@ -27,7 +27,7 @@ impl<'a> Painter<'a> {
self.transform
.transform_pos([seg.to.x() as f32, seg.to.y() as f32].into()),
],
egui::Stroke::new(seg.width as f32, color),
egui::Stroke::new(seg.width as f32 * self.transform.scale().x, color),
),
Shape::Bend(bend) => {
let delta_from = bend.from - bend.c.pos;
@ -45,7 +45,10 @@ impl<'a> Painter<'a> {
points.push(self.transform.transform_pos([x as f32, y as f32].into()));
}
epaint::Shape::line(points, egui::Stroke::new(bend.width as f32, color))
epaint::Shape::line(
points,
egui::Stroke::new(bend.width as f32 * self.transform.scale().x, color),
)
}
};