| 362 | |
| 363 | impl<'a> egui::Widget for XYPad<'a> { |
| 364 | fn ui(self, ui: &mut egui::Ui) -> egui::Response { |
| 365 | let (mut response, painter) = ui.allocate_painter( |
| 366 | egui::Vec2::new(self.width, self.width), |
| 367 | Sense::click_and_drag(), |
| 368 | ); |
| 369 | |
| 370 | let x_range_span = *self.x_range.end() - *self.x_range.start(); |
| 371 | let y_range_span = *self.y_range.end() - *self.y_range.start(); |
| 372 | |
| 373 | let x_normal = (*self.x_value - *self.x_range.start()) / x_range_span; |
| 374 | let y_normal = (*self.y_value - *self.y_range.start()) / y_range_span; |
| 375 | |
| 376 | let handle_pos = Pos2::new( |
| 377 | response.rect.left() + (response.rect.size().x * x_normal), |
| 378 | response.rect.top() + (response.rect.size().y * y_normal), |
| 379 | ); |
| 380 | |
| 381 | painter.rect_stroke( |
| 382 | response.rect.expand(-1.0), |
| 383 | 0.0, |
| 384 | Stroke::new(1.0f32, Color32::DARK_GRAY), |
| 385 | StrokeKind::Middle, |
| 386 | ); |
| 387 | |
| 388 | painter.add(CircleShape::filled( |
| 389 | response.rect.center(), |
| 390 | 3.0, |
| 391 | Color32::DARK_GRAY, |
| 392 | )); |
| 393 | |
| 394 | painter.add(CircleShape::filled(handle_pos, 3.0, Color32::DARK_GREEN)); |
| 395 | |
| 396 | let point_id = response.id.with(0); |
| 397 | let point_response = ui.interact(response.rect, point_id, Sense::click_and_drag()); |
| 398 | |
| 399 | if let Some(point_pos) = point_response.interact_pointer_pos() { |
| 400 | let x_normal = (point_pos.x - response.rect.left()) / response.rect.size().x; |
| 401 | let y_normal = (point_pos.y - response.rect.top()) / response.rect.size().y; |
| 402 | |
| 403 | *self.x_value = (*self.x_range.start() + (x_range_span * x_normal)) |
| 404 | .clamp(*self.x_range.start(), *self.x_range.end()); |
| 405 | *self.y_value = (*self.y_range.start() + (y_range_span * y_normal)) |
| 406 | .clamp(*self.y_range.start(), *self.y_range.end()); |
| 407 | |
| 408 | response.mark_changed(); |
| 409 | } |
| 410 | |
| 411 | response |
| 412 | } |
| 413 | } |