Various fixes for 2d polygon editor

Fixes issues 15096, 15097
Fixes various other Line2D edit issues
Fixes previous outline
Fixes retina support

editor/plugins/abstract_polygon_2d_editor.cpp

@@ -235,7 +235,7 @@ void AbstractPolygon2DEditor::_wip_close() {
 	if (_is_line()) {
 
 		_set_polygon(0, wip);
-	} else if (wip.size() >= 3) {
+	} else if (wip.size() >= (_is_line() ? 2 : 3)) {
 
 		undo_redo->create_action(TTR("Create Poly"));
 		_action_add_polygon(wip);
@@ -281,46 +281,7 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 		Vector2 gpoint = mb->get_position();
 		Vector2 cpoint = _get_node()->get_global_transform().affine_inverse().xform(canvas_item_editor->snap_point(canvas_item_editor->get_canvas_transform().affine_inverse().xform(mb->get_position())));
 
-		if (mode == MODE_CREATE) {
-
-			if (mb->get_button_index() == BUTTON_LEFT && mb->is_pressed()) {
-
-				if (!wip_active) {
-
-					wip.clear();
-					wip.push_back(cpoint);
-					wip_active = true;
-					_wip_changed();
-					edited_point = PosVertex(-1, 1, cpoint);
-					canvas_item_editor->get_viewport_control()->update();
-					hover_point = Vertex();
-					selected_point = Vertex(0);
-					edge_point = PosVertex();
-					return true;
-				} else {
-
-					const real_t grab_threshold = EDITOR_DEF("editors/poly_editor/point_grab_radius", 8);
-
-					if (!_is_line() && wip.size() > 1 && xform.xform(wip[0]).distance_to(gpoint) < grab_threshold) {
-						//wip closed
-						_wip_close();
-
-						return true;
-					} else {
-
-						//add wip point
-						wip.push_back(cpoint);
-						_wip_changed();
-						edited_point = PosVertex(-1, wip.size(), cpoint);
-						selected_point = Vertex(wip.size() - 1);
-						canvas_item_editor->get_viewport_control()->update();
-						return true;
-					}
-				}
-			} else if (mb->get_button_index() == BUTTON_RIGHT && mb->is_pressed() && wip_active) {
-				_wip_close();
-			}
-		} else if (mode == MODE_EDIT) {
+		if (mode == MODE_EDIT || (_is_line() && mode == MODE_CREATE)) {
 
 			if (mb->get_button_index() == BUTTON_LEFT) {
 
@@ -332,7 +293,7 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 
 						Vector<Vector2> vertices = _get_polygon(insert.polygon);
 
-						if (vertices.size() < 3) {
+						if (vertices.size() < (_is_line() ? 2 : 3)) {
 
 							vertices.push_back(cpoint);
 							undo_redo->create_action(TTR("Edit Poly"));
@@ -344,6 +305,7 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 
 							Vector<Vector2> vertices = _get_polygon(insert.polygon);
 							pre_move_edit = vertices;
+							printf("setting pre_move_edit\n");
 							edited_point = PosVertex(insert.polygon, insert.vertex + 1, xform.affine_inverse().xform(insert.pos));
 							vertices.insert(edited_point.vertex, edited_point.pos);
 							selected_point = edited_point;
@@ -362,6 +324,7 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 
 						if (closest.valid()) {
 
+							printf("setting pre_move_edit\n");
 							pre_move_edit = _get_polygon(closest.polygon);
 							edited_point = PosVertex(closest, xform.affine_inverse().xform(closest.pos));
 							selected_point = closest;
@@ -414,6 +377,56 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 				}
 			}
 		}
+
+		if (mode == MODE_CREATE) {
+
+			if (mb->get_button_index() == BUTTON_LEFT && mb->is_pressed()) {
+
+				if (_is_line()) {
+
+					// for lines, we don't have a wip mode, and we can undo each single add point.
+					Vector<Vector2> vertices = _get_polygon(0);
+					vertices.push_back(cpoint);
+					undo_redo->create_action(TTR("Insert Point"));
+					_action_set_polygon(0, vertices);
+					_commit_action();
+					return true;
+				} else if (!wip_active) {
+
+					wip.clear();
+					wip.push_back(cpoint);
+					wip_active = true;
+					_wip_changed();
+					edited_point = PosVertex(-1, 1, cpoint);
+					canvas_item_editor->get_viewport_control()->update();
+					hover_point = Vertex();
+					selected_point = Vertex(0);
+					edge_point = PosVertex();
+					return true;
+				} else {
+
+					const real_t grab_threshold = EDITOR_DEF("editors/poly_editor/point_grab_radius", 8);
+
+					if (!_is_line() && wip.size() > 1 && xform.xform(wip[0]).distance_to(gpoint) < grab_threshold) {
+						//wip closed
+						_wip_close();
+
+						return true;
+					} else {
+
+						//add wip point
+						wip.push_back(cpoint);
+						_wip_changed();
+						edited_point = PosVertex(-1, wip.size(), cpoint);
+						selected_point = Vertex(wip.size() - 1);
+						canvas_item_editor->get_viewport_control()->update();
+						return true;
+					}
+				}
+			} else if (mb->get_button_index() == BUTTON_RIGHT && mb->is_pressed() && wip_active) {
+				_wip_close();
+			}
+		}
 	}
 
 	Ref<InputEventMouseMotion> mm = p_event;
@@ -436,7 +449,7 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 			}
 
 			canvas_item_editor->get_viewport_control()->update();
-		} else if (mode == MODE_EDIT) {
+		} else if (mode == MODE_EDIT || (_is_line() && mode == MODE_CREATE)) {
 
 			const PosVertex onEdgeVertex = closest_edge_point(gpoint);
 
@@ -535,7 +548,7 @@ void AbstractPolygon2DEditor::forward_draw_over_viewport(Control *p_overlay) {
 
 			const Color col = Color(0.5, 0.5, 0.5); // FIXME polygon->get_outline_color();
 			const int n = pre_move_edit.size();
-			for (int i = 0; i < n - is_closed ? 0 : 1; i++) {
+			for (int i = 0; i < n - (is_closed ? 0 : 1); i++) {
 
 				Vector2 p, p2;
 				p = pre_move_edit[i] + offset;
@@ -544,7 +557,7 @@ void AbstractPolygon2DEditor::forward_draw_over_viewport(Control *p_overlay) {
 				Vector2 point = xform.xform(p);
 				Vector2 next_point = xform.xform(p2);
 
-				vpc->draw_line(point, next_point, col, 2);
+				vpc->draw_line(point, next_point, col, 2 * EDSCALE);
 			}
 		}
 
@@ -568,7 +581,7 @@ void AbstractPolygon2DEditor::forward_draw_over_viewport(Control *p_overlay) {
 					p2 = points[(i + 1) % n_points] + offset;
 
 				const Vector2 next_point = xform.xform(p2);
-				vpc->draw_line(point, next_point, col, 2);
+				vpc->draw_line(point, next_point, col, 2 * EDSCALE);
 			}
 		}
 
@@ -630,7 +643,7 @@ void AbstractPolygon2DEditor::remove_point(const Vertex &p_vertex) {
 
 	PoolVector<Vector2> vertices = _get_polygon(p_vertex.polygon);
 
-	if (vertices.size() > 3) {
+	if (vertices.size() > (_is_line() ? 2 : 3)) {
 
 		vertices.remove(p_vertex.vertex);
 
@@ -705,8 +718,9 @@ AbstractPolygon2DEditor::PosVertex AbstractPolygon2DEditor::closest_edge_point(c
 		PoolVector<Vector2> points = _get_polygon(j);
 		const Vector2 offset = _get_offset(j);
 		const int n_points = points.size();
+		const int n_segments = n_points - (_is_line() ? 1 : 0);
 
-		for (int i = 0; i < n_points; i++) {
+		for (int i = 0; i < n_segments; i++) {
 
 			Vector2 segment[2] = { xform.xform(points[i] + offset),
 				xform.xform(points[(i + 1) % n_points] + offset) };