Add handle visualization during point insertion in the Path tool (#2197)

* added_handle_overlays

* changed color to yellow

* Rename color parameter

* Change the color to blue

---------

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

editor/src/messages/tool/common_functionality/shape_editor.rs

@@ -116,6 +116,20 @@ impl ClosestSegment {
 		(stroke_width_sq + tolerance_sq) < dist_sq
 	}
 
+	pub fn handle_positions(&self, document_metadata: &DocumentMetadata) -> (Option<DVec2>, Option<DVec2>) {
+		// Transform to viewport space
+		let transform = document_metadata.transform_to_viewport(self.layer);
+
+		// Split the Bezier at the parameter `t`
+		let [first, second] = self.bezier.split(TValue::Parametric(self.t));
+
+		// Transform the handle positions to viewport space
+		let first_handle = first.handle_end().map(|handle| transform.transform_point2(handle));
+		let second_handle = second.handle_start().map(|handle| transform.transform_point2(handle));
+
+		(first_handle, second_handle)
+	}
+
 	pub fn adjusted_insert(&self, responses: &mut VecDeque<Message>) -> PointId {
 		let layer = self.layer;
 		let [first, second] = self.bezier.split(TValue::Parametric(self.t));

editor/src/messages/tool/common_functionality/snapping.rs

@@ -461,10 +461,10 @@ impl SnapManager {
 				overlay_context.line(viewport, target, None);
 			}
 			for &target in align.iter().flatten() {
-				overlay_context.manipulator_handle(target, false);
+				overlay_context.manipulator_handle(target, false, None);
 			}
 			if any_align {
-				overlay_context.manipulator_handle(viewport, false);
+				overlay_context.manipulator_handle(viewport, false, None);
 			}
 
 			if !any_align && ind.distribution_equal_distance_x.is_none() && ind.distribution_equal_distance_y.is_none() {