Implement viewport selection (#178)

* Begin implementing viewport selection

* Implement viewport click and drag selection for ellipse and rectangle

* Begin implementing line selection

* Remove debug prints

* Run cargo format

* Use DVec2 instead of kurbo::Point

* Line and polyline intersection

* Run cargo format

* Add fix for missing layer panel update

* Replace point selection with box selection

* Formatting

Co-authored-by: Keavon Chambers <keavon@keavon.com>

core/document/src/layers/line.rs

@@ -1,6 +1,10 @@
+use glam::DAffine2;
 use glam::DVec2;
 use kurbo::Point;
 
+use crate::intersection::intersect_quad_bez_path;
+use crate::LayerId;
+
 use super::style;
 use super::LayerData;
 
@@ -17,7 +21,7 @@ impl Line {
 }
 
 impl LayerData for Line {
-	fn to_kurbo_path(&mut self, transform: glam::DAffine2, _style: style::PathStyle) -> kurbo::BezPath {
+	fn to_kurbo_path(&self, transform: glam::DAffine2, _style: style::PathStyle) -> kurbo::BezPath {
 		fn new_point(a: DVec2) -> Point {
 			Point::new(a.x, a.y)
 		}
@@ -26,10 +30,17 @@ impl LayerData for Line {
 		path.line_to(new_point(transform.transform_point2(DVec2::ONE)));
 		path
 	}
+
 	fn render(&mut self, svg: &mut String, transform: glam::DAffine2, style: style::PathStyle) {
 		let [x1, y1] = transform.translation.to_array();
 		let [x2, y2] = transform.transform_point2(DVec2::ONE).to_array();
 
 		let _ = write!(svg, r#"<line x1="{}" y1="{}" x2="{}" y2="{}"{} />"#, x1, y1, x2, y2, style.render(),);
 	}
+
+	fn intersects_quad(&self, quad: [DVec2; 4], path: &mut Vec<LayerId>, intersections: &mut Vec<Vec<LayerId>>, style: style::PathStyle) {
+		if intersect_quad_bez_path(quad, &self.to_kurbo_path(DAffine2::IDENTITY, style), false) {
+			intersections.push(path.clone());
+		}
+	}
 }