Add `width` and `antialiased` parameters to CanvasItem `draw_rect()`

This also removes some duplicated editor code which is now obsoleted
by the new parameters in `draw_rect()`.

doc/classes/CanvasItem.xml

@@ -223,8 +223,13 @@
 			</argument>
 			<argument index="2" name="filled" type="bool" default="true">
 			</argument>
+			<argument index="3" name="width" type="float" default="1.0">
+			</argument>
+			<argument index="4" name="antialiased" type="bool" default="false">
+			</argument>
 			<description>
-				Draws a colored rectangle.
+				Draws a rectangle. If [code]filled[/code] is [code]true[/code], the rectangle will be filled with the [code]color[/code] specified. If [code]filled[/code] is [code]false[/code], the rectangle will be drawn as a stroke with the [code]color[/code] and [code]width[/code] specified. If [code]antialiased[/code] is [code]true[/code], the lines will be antialiased.
+				[b]Note:[/b] [code]width[/code] and [code]antialiased[/code] are only effective if [code]filled[/code] is [code]false[/code].
 			</description>
 		</method>
 		<method name="draw_set_transform">

editor/plugins/curve_editor_plugin.cpp

@@ -715,7 +715,7 @@ void CurveEditor::_draw() {
 	if (_hover_point != -1) {
 		const Color hover_color = line_color;
 		Vector2 pos = curve.get_point_position(_hover_point);
-		stroke_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(_hover_radius), hover_color);
+		draw_rect(Rect2(get_view_pos(pos), Vector2(1, 1)).grow(_hover_radius), hover_color, false, Math::round(EDSCALE));
 	}
 
 	// Help text
@@ -726,23 +726,6 @@ void CurveEditor::_draw() {
 	}
 }
 
-// TODO That should be part of the drawing API...
-void CurveEditor::stroke_rect(Rect2 rect, Color color) {
-
-	// a---b
-	// |   |
-	// c---d
-	Vector2 a(rect.position);
-	Vector2 b(rect.position.x + rect.size.x, rect.position.y);
-	Vector2 c(rect.position.x, rect.position.y + rect.size.y);
-	Vector2 d(rect.position + rect.size);
-
-	draw_line(a, b, color, Math::round(EDSCALE));
-	draw_line(b, d, color, Math::round(EDSCALE));
-	draw_line(d, c, color, Math::round(EDSCALE));
-	draw_line(c, a, color, Math::round(EDSCALE));
-}
-
 void CurveEditor::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_gui_input"), &CurveEditor::on_gui_input);
 	ClassDB::bind_method(D_METHOD("_on_preset_item_selected"), &CurveEditor::on_preset_item_selected);

editor/plugins/curve_editor_plugin.h

@@ -97,8 +97,6 @@ private:
 
 	void _draw();
 
-	void stroke_rect(Rect2 rect, Color color);
-
 private:
 	Transform2D _world_to_view;
 

editor/plugins/spatial_editor_plugin.cpp

@@ -2348,23 +2348,6 @@ void SpatialEditorViewport::_notification(int p_what) {
 	}
 }
 
-// TODO That should be part of the drawing API...
-static void stroke_rect(CanvasItem &ci, Rect2 rect, Color color, real_t width = 1.0) {
-
-	// a---b
-	// |   |
-	// c---d
-	Vector2 a(rect.position);
-	Vector2 b(rect.position.x + rect.size.x, rect.position.y);
-	Vector2 c(rect.position.x, rect.position.y + rect.size.y);
-	Vector2 d(rect.position + rect.size);
-
-	ci.draw_line(a, b, color, width);
-	ci.draw_line(b, d, color, width);
-	ci.draw_line(d, c, color, width);
-	ci.draw_line(c, a, color, width);
-}
-
 static void draw_indicator_bar(Control &surface, real_t fill, Ref<Texture> icon) {
 
 	// Adjust bar size from control height
@@ -2379,7 +2362,7 @@ static void draw_indicator_bar(Control &surface, real_t fill, Ref<Texture> icon)
 	// Draw both neutral dark and bright colors to account this
 	surface.draw_rect(r, Color(1, 1, 1, 0.2));
 	surface.draw_rect(Rect2(r.position.x, r.position.y + r.size.y - sy, r.size.x, sy), Color(1, 1, 1, 0.6));
-	stroke_rect(surface, r.grow(1), Color(0, 0, 0, 0.7));
+	surface.draw_rect(r.grow(1), Color(0, 0, 0, 0.7), false, Math::round(EDSCALE));
 
 	Vector2 icon_size = icon->get_size();
 	Vector2 icon_pos = Vector2(r.position.x - (icon_size.x - r.size.x) / 2, r.position.y + r.size.y + 2);
@@ -2460,7 +2443,7 @@ void SpatialEditorViewport::_draw() {
 
 		draw_rect = Rect2(Vector2(), s).clip(draw_rect);
 
-		stroke_rect(*surface, draw_rect, Color(0.6, 0.6, 0.1, 0.5), 2.0);
+		surface->draw_rect(draw_rect, Color(0.6, 0.6, 0.1, 0.5), false, Math::round(2 * EDSCALE));
 
 	} else {
 

scene/2d/canvas_item.cpp

@@ -759,7 +759,7 @@ void CanvasItem::draw_multiline_colors(const Vector<Point2> &p_points, const Vec
 	VisualServer::get_singleton()->canvas_item_add_multiline(canvas_item, p_points, p_colors, p_width, p_antialiased);
 }
 
-void CanvasItem::draw_rect(const Rect2 &p_rect, const Color &p_color, bool p_filled) {
+void CanvasItem::draw_rect(const Rect2 &p_rect, const Color &p_color, bool p_filled, float p_width, bool p_antialiased) {
 
 	if (!drawing) {
 		ERR_EXPLAIN("Drawing is only allowed inside NOTIFICATION_DRAW, _draw() function or 'draw' signal.");
@@ -767,13 +767,53 @@ void CanvasItem::draw_rect(const Rect2 &p_rect, const Color &p_color, bool p_fil
 	}
 
 	if (p_filled) {
+		if (p_width != 1.0) {
+			WARN_PRINT("The draw_rect() \"width\" argument has no effect when \"filled\" is \"true\".");
+		}
+
+		if (p_antialiased) {
+			WARN_PRINT("The draw_rect() \"antialiased\" argument has no effect when \"filled\" is \"true\".");
+		}
 
 		VisualServer::get_singleton()->canvas_item_add_rect(canvas_item, p_rect, p_color);
 	} else {
-		VisualServer::get_singleton()->canvas_item_add_line(canvas_item, p_rect.position, p_rect.position + Size2(p_rect.size.width, 0), p_color);
-		VisualServer::get_singleton()->canvas_item_add_line(canvas_item, p_rect.position, p_rect.position + Size2(0, p_rect.size.height), p_color);
-		VisualServer::get_singleton()->canvas_item_add_line(canvas_item, p_rect.position + Point2(0, p_rect.size.height), p_rect.position + p_rect.size, p_color);
-		VisualServer::get_singleton()->canvas_item_add_line(canvas_item, p_rect.position + Point2(p_rect.size.width, 0), p_rect.position + p_rect.size, p_color);
+		// Thick lines are offset depending on their width to avoid partial overlapping.
+		// Thin lines don't require an offset, so don't apply one in this case
+		float offset;
+		if (p_width >= 2) {
+			offset = p_width / 2.0;
+		} else {
+			offset = 0.0;
+		}
+
+		VisualServer::get_singleton()->canvas_item_add_line(
+				canvas_item,
+				p_rect.position + Point2(-offset, 0),
+				p_rect.position + Size2(p_rect.size.width + offset, 0),
+				p_color,
+				p_width,
+				p_antialiased);
+		VisualServer::get_singleton()->canvas_item_add_line(
+				canvas_item,
+				p_rect.position + Point2(0, offset),
+				p_rect.position + Size2(0, p_rect.size.height - offset),
+				p_color,
+				p_width,
+				p_antialiased);
+		VisualServer::get_singleton()->canvas_item_add_line(
+				canvas_item,
+				p_rect.position + Point2(-offset, p_rect.size.height),
+				p_rect.position + Size2(p_rect.size.width + offset, p_rect.size.height),
+				p_color,
+				p_width,
+				p_antialiased);
+		VisualServer::get_singleton()->canvas_item_add_line(
+				canvas_item,
+				p_rect.position + Point2(p_rect.size.width, offset),
+				p_rect.position + Size2(p_rect.size.width, p_rect.size.height - offset),
+				p_color,
+				p_width,
+				p_antialiased);
 	}
 }
 
@@ -1158,7 +1198,7 @@ void CanvasItem::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("draw_polyline_colors", "points", "colors", "width", "antialiased"), &CanvasItem::draw_polyline_colors, DEFVAL(1.0), DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("draw_multiline", "points", "color", "width", "antialiased"), &CanvasItem::draw_multiline, DEFVAL(1.0), DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("draw_multiline_colors", "points", "colors", "width", "antialiased"), &CanvasItem::draw_multiline_colors, DEFVAL(1.0), DEFVAL(false));
-	ClassDB::bind_method(D_METHOD("draw_rect", "rect", "color", "filled"), &CanvasItem::draw_rect, DEFVAL(true));
+	ClassDB::bind_method(D_METHOD("draw_rect", "rect", "color", "filled", "width", "antialiased"), &CanvasItem::draw_rect, DEFVAL(true), DEFVAL(1.0), DEFVAL(false));
 	ClassDB::bind_method(D_METHOD("draw_circle", "position", "radius", "color"), &CanvasItem::draw_circle);
 	ClassDB::bind_method(D_METHOD("draw_texture", "texture", "position", "modulate", "normal_map"), &CanvasItem::draw_texture, DEFVAL(Color(1, 1, 1, 1)), DEFVAL(Variant()));
 	ClassDB::bind_method(D_METHOD("draw_texture_rect", "texture", "rect", "tile", "modulate", "transpose", "normal_map"), &CanvasItem::draw_texture_rect, DEFVAL(Color(1, 1, 1)), DEFVAL(false), DEFVAL(Variant()));

scene/2d/canvas_item.h

@@ -307,7 +307,7 @@ public:
 	void draw_polyline_colors(const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width = 1.0, bool p_antialiased = false);
 	void draw_multiline(const Vector<Point2> &p_points, const Color &p_color, float p_width = 1.0, bool p_antialiased = false);
 	void draw_multiline_colors(const Vector<Point2> &p_points, const Vector<Color> &p_colors, float p_width = 1.0, bool p_antialiased = false);
-	void draw_rect(const Rect2 &p_rect, const Color &p_color, bool p_filled = true);
+	void draw_rect(const Rect2 &p_rect, const Color &p_color, bool p_filled = true, float p_width = 1.0, bool p_antialiased = false);
 	void draw_circle(const Point2 &p_pos, float p_radius, const Color &p_color);
 	void draw_texture(const Ref<Texture> &p_texture, const Point2 &p_pos, const Color &p_modulate = Color(1, 1, 1, 1), const Ref<Texture> &p_normal_map = Ref<Texture>());
 	void draw_texture_rect(const Ref<Texture> &p_texture, const Rect2 &p_rect, bool p_tile = false, const Color &p_modulate = Color(1, 1, 1), bool p_transpose = false, const Ref<Texture> &p_normal_map = Ref<Texture>());