Draw an outline for 2D debug collision shapes

This makes them easier to distinguish, especially when used
in a TileMap.

The default color's opacity has been slightly decreased to account
for the new outline.

1 files changed, 19 insertions, 3 deletions

diff --git a/scene/resources/rectangle_shape_2d.cpp b/scene/resources/rectangle_shape_2d.cpp
index a5b909c9a7..0fd65d8c72 100644
--- a/scene/resources/rectangle_shape_2d.cpp
+++ b/scene/resources/rectangle_shape_2d.cpp
@@ -33,7 +33,7 @@
 #include "servers/physics_server_2d.h"
 #include "servers/rendering_server.h"
 void RectangleShape2D::_update_shape() {
-	PhysicsServer2D::get_singleton()->shape_set_data(get_rid(), size / 2);
+	PhysicsServer2D::get_singleton()->shape_set_data(get_rid(), size * 0.5);
 	emit_changed();
 }
 
@@ -47,11 +47,27 @@ Vector2 RectangleShape2D::get_size() const {
 }
 
 void RectangleShape2D::draw(const RID &p_to_rid, const Color &p_color) {
-	RenderingServer::get_singleton()->canvas_item_add_rect(p_to_rid, Rect2(-size / 2, size), p_color);
+	// Draw an outlined rectangle to make individual shapes easier to distinguish.
+	Vector<Vector2> stroke_points;
+	stroke_points.resize(5);
+	stroke_points.write[0] = -size * 0.5;
+	stroke_points.write[1] = Vector2(size.x, -size.y) * 0.5;
+	stroke_points.write[2] = size * 0.5;
+	stroke_points.write[3] = Vector2(-size.x, size.y) * 0.5;
+	stroke_points.write[4] = -size * 0.5;
+
+	Vector<Color> stroke_colors;
+	stroke_colors.resize(5);
+	for (int i = 0; i < 5; i++) {
+		stroke_colors.write[i] = (p_color);
+	}
+
+	RenderingServer::get_singleton()->canvas_item_add_rect(p_to_rid, Rect2(-size * 0.5, size), p_color);
+	RenderingServer::get_singleton()->canvas_item_add_polyline(p_to_rid, stroke_points, stroke_colors);
 }
 
 Rect2 RectangleShape2D::get_rect() const {
-	return Rect2(-size / 2, size);
+	return Rect2(-size * 0.5, size);
 }
 
 real_t RectangleShape2D::get_enclosing_radius() const {