Added Line2D node that draws a polygon-based line

It supports unlimited width, color gradient, texture and some geometry
options for joints and caps. Also transparency without artifacts
(provided that line joints aren't too sharp).

6 files changed, 452 insertions, 0 deletions

diff --git a/tools/editor/editor_node.cpp b/tools/editor/editor_node.cpp
index bb33f19a2b..979f54dabb 100644
--- a/tools/editor/editor_node.cpp
+++ b/tools/editor/editor_node.cpp
@@ -88,6 +88,7 @@
 #include "plugins/script_editor_plugin.h"
 #include "plugins/script_text_editor.h"
 #include "plugins/path_2d_editor_plugin.h"
+#include "plugins/line_2d_editor_plugin.h"
 #include "plugins/particles_editor_plugin.h"
 #include "plugins/particles_2d_editor_plugin.h"
 #include "plugins/animation_tree_editor_plugin.h"
@@ -6599,6 +6600,7 @@ EditorNode::EditorNode() {
 	add_editor_plugin( memnew( Path2DEditorPlugin(this) ) );
 	//add_editor_plugin( memnew( PathEditorPlugin(this) ) );
 	//add_editor_plugin( memnew( BakedLightEditorPlugin(this) ) );
+	add_editor_plugin( memnew( Line2DEditorPlugin(this) ) );
 	add_editor_plugin( memnew( Polygon2DEditorPlugin(this) ) );
 	add_editor_plugin( memnew( LightOccluder2DEditorPlugin(this) ) );
 	add_editor_plugin( memnew( NavigationPolygonEditorPlugin(this) ) );
diff --git a/tools/editor/icons/2x/icon_line_2d.png b/tools/editor/icons/2x/icon_line_2d.png
new file mode 100644
index 0000000000..27299a2b69
--- /dev/null
+++ b/tools/editor/icons/2x/icon_line_2d.png
diff --git a/tools/editor/icons/icon_line_2d.png b/tools/editor/icons/icon_line_2d.png
new file mode 100644
index 0000000000..4ebf46af04
--- /dev/null
+++ b/tools/editor/icons/icon_line_2d.png
diff --git a/tools/editor/icons/source/icon_line_2d.svg b/tools/editor/icons/source/icon_line_2d.svg
new file mode 100644
index 0000000000..7f833f4a9c
--- /dev/null
+++ b/tools/editor/icons/source/icon_line_2d.svg
@@ -0,0 +1,82 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="16"
+   height="16"
+   viewBox="0 0 16 16"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.91 r13725"
+   inkscape:export-filename="D:\PROJETS\INFO\GODOT\ENGINE\godot_fork\tools\editor\icons\2x\icon_line_2d.png"
+   inkscape:export-xdpi="180"
+   inkscape:export-ydpi="180"
+   sodipodi:docname="icon_line_2d.svg">
+  <defs
+     id="defs4" />
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="31.999999"
+     inkscape:cx="7.5587317"
+     inkscape:cy="9.1781644"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="true"
+     units="px"
+     inkscape:snap-bbox="true"
+     inkscape:bbox-paths="true"
+     inkscape:bbox-nodes="true"
+     inkscape:snap-bbox-edge-midpoints="true"
+     inkscape:snap-bbox-midpoints="true"
+     inkscape:snap-object-midpoints="true"
+     inkscape:snap-center="true"
+     inkscape:window-width="1920"
+     inkscape:window-height="1017"
+     inkscape:window-x="-8"
+     inkscape:window-y="32"
+     inkscape:window-maximized="1"
+     inkscape:snap-grids="true"
+     inkscape:object-nodes="true"
+     showguides="false">
+    <inkscape:grid
+       type="xygrid"
+       id="grid3336"
+       empspacing="4" />
+  </sodipodi:namedview>
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Layer 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(0,-1036.3622)">
+    <path
+       style="fill:none;fill-opacity:1;fill-rule:evenodd;stroke:#a5b7f3;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:0.98823529"
+       d="m 2,1045.3622 3,4 3,-10 3,6 3,-2"
+       id="path4135"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="ccccc" />
+  </g>
+</svg>
diff --git a/tools/editor/plugins/line_2d_editor_plugin.cpp b/tools/editor/plugins/line_2d_editor_plugin.cpp
new file mode 100644
index 0000000000..054a2c62e0
--- /dev/null
+++ b/tools/editor/plugins/line_2d_editor_plugin.cpp
@@ -0,0 +1,283 @@
+#include "line_2d_editor_plugin.h"
+
+#include "canvas_item_editor_plugin.h"
+#include "os/file_access.h"
+#include "tools/editor/editor_settings.h"
+#include "os/keyboard.h"
+
+
+//----------------------------------------------------------------------------
+// Line2DEditor
+//----------------------------------------------------------------------------
+
+void Line2DEditor::_node_removed(Node *p_node) {
+	if(p_node == node) {
+		node=NULL;
+		hide();
+	}
+}
+
+void Line2DEditor::_notification(int p_what) {
+	switch(p_what) {
+	case NOTIFICATION_VISIBILITY_CHANGED:
+		// This widget is not a child but should have the same visibility state
+		base_hb->set_visible(is_visible());
+		break;
+	}
+}
+
+Vector2 Line2DEditor::mouse_to_local_pos(Vector2 gpoint, bool alt) {
+	Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
+	return !alt? canvas_item_editor->snap_point(xform.affine_inverse().xform(gpoint))
+				: node->get_global_transform().affine_inverse().xform(
+					canvas_item_editor->snap_point(
+						canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint)) );
+}
+
+int Line2DEditor::get_point_index_at(Vector2 gpos) {
+	ERR_FAIL_COND_V(node == 0, -1);
+
+	real_t grab_treshold = EDITOR_DEF("poly_editor/point_grab_radius", 8);
+	Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
+
+	for(int i = 0; i < node->get_point_count(); ++i) {
+		Point2 p = xform.xform( node->get_point_pos(i) );
+		if(gpos.distance_to(p) < grab_treshold) {
+			return i;
+		}
+	}
+
+	return -1;
+}
+
+bool Line2DEditor::forward_input_event(const InputEvent& p_event) {
+
+	if (!node)
+		return false;
+
+	if (!node->is_visible())
+		return false;
+
+	switch(p_event.type) {
+
+		case InputEvent::MOUSE_BUTTON: {
+
+			const InputEventMouseButton &mb = p_event.mouse_button;
+
+			Vector2 gpoint = Point2(mb.x,mb.y);
+			Vector2 cpoint = mouse_to_local_pos(gpoint, mb.mod.alt);
+
+			if(mb.pressed && _dragging == false) {
+				int i = get_point_index_at(gpoint);
+				if(i != -1) {
+					if (mb.button_index == BUTTON_LEFT && !mb.mod.shift && mode == MODE_EDIT) {
+						_dragging = true;
+						action_point = i;
+						moving_from = node->get_point_pos(i);
+						moving_screen_from = gpoint;
+					}
+					else if((mb.button_index == BUTTON_RIGHT && mode == MODE_EDIT) || (mb.button_index == BUTTON_LEFT && mode == MODE_DELETE)) {
+						undo_redo->create_action(TTR("Remove Point from Line2D"));
+						undo_redo->add_do_method(node, "remove_point", i);
+						undo_redo->add_undo_method(node, "add_point", node->get_point_pos(i), i);
+						undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
+						undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
+						undo_redo->commit_action();
+					}
+				}
+				return true;
+			}
+
+			if(mb.pressed && mb.button_index == BUTTON_LEFT && ((mb.mod.command && mode == MODE_EDIT) || mode == MODE_CREATE)) {
+
+				undo_redo->create_action(TTR("Add Point to Line2D"));
+				undo_redo->add_do_method(node, "add_point", cpoint);
+				undo_redo->add_undo_method(node, "remove_point", node->get_point_count());
+				undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
+				undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
+				undo_redo->commit_action();
+
+				_dragging = true;
+				action_point = node->get_point_count()-1;
+				moving_from = node->get_point_pos(action_point);
+				moving_screen_from = gpoint;
+
+				canvas_item_editor->get_viewport_control()->update();
+
+				return true;
+			}
+
+			if(!mb.pressed && mb.button_index == BUTTON_LEFT && _dragging) {
+				undo_redo->create_action(TTR("Move Point in Line2D"));
+				undo_redo->add_do_method(node, "set_point_pos", action_point, cpoint);
+				undo_redo->add_undo_method(node, "set_point_pos", action_point, moving_from);
+				undo_redo->add_do_method(canvas_item_editor->get_viewport_control(), "update");
+				undo_redo->add_undo_method(canvas_item_editor->get_viewport_control(), "update");
+				undo_redo->commit_action();
+				_dragging = false;
+				return true;
+			}
+		}
+		break;
+
+		case InputEvent::MOUSE_MOTION: {
+			if (_dragging) {
+				const InputEventMouseMotion &mm = p_event.mouse_motion;
+				Vector2 cpoint = mouse_to_local_pos(Vector2(mm.x, mm.y), mm.mod.alt);
+				node->set_point_pos(action_point,cpoint);
+				canvas_item_editor->get_viewport_control()->update();
+				return true;
+			}
+		}
+		break;
+	}
+
+	return false;
+}
+
+void Line2DEditor::_canvas_draw() {
+
+	if (!node)
+		return;
+
+	if (!node->is_visible())
+		return;
+
+	Transform2D xform = canvas_item_editor->get_canvas_transform() * node->get_global_transform();
+	Ref<Texture> handle = get_icon("EditorHandle", "EditorIcons");
+	Size2 handle_size = handle->get_size();
+
+	int len = node->get_point_count();
+	Control *vpc = canvas_item_editor->get_viewport_control();
+
+	for(int i=0; i < len; ++i) {
+		Vector2 point = xform.xform(node->get_point_pos(i));
+		vpc->draw_texture_rect(handle, Rect2(point - handle_size * 0.5, handle_size), false);
+	}
+}
+
+void Line2DEditor::_node_visibility_changed() {
+	if (!node)
+		return;
+	canvas_item_editor->get_viewport_control()->update();
+}
+
+void Line2DEditor::edit(Node *p_line2d) {
+
+	if (!canvas_item_editor)
+		canvas_item_editor = CanvasItemEditor::get_singleton();
+
+	if (p_line2d) {
+		node = p_line2d->cast_to<Line2D>();
+		if (!canvas_item_editor->get_viewport_control()->is_connected("draw", this, "_canvas_draw"))
+			canvas_item_editor->get_viewport_control()->connect("draw", this, "_canvas_draw");
+		if (!node->is_connected("visibility_changed", this, "_node_visibility_changed"))
+			node->connect("visibility_changed", this, "_node_visibility_changed");
+	}
+	else {
+		if (canvas_item_editor->get_viewport_control()->is_connected("draw", this, "_canvas_draw"))
+			canvas_item_editor->get_viewport_control()->disconnect("draw", this, "_canvas_draw");
+		// node may have been deleted at this point
+		if (node && node->is_connected("visibility_changed", this, "_node_visibility_changed"))
+			node->disconnect("visibility_changed", this, "_node_visibility_changed");
+		node = NULL;
+	}
+}
+
+void Line2DEditor::_bind_methods() {
+	ClassDB::bind_method(_MD("_canvas_draw"), &Line2DEditor::_canvas_draw);
+	ClassDB::bind_method(_MD("_node_visibility_changed"), &Line2DEditor::_node_visibility_changed);
+	ClassDB::bind_method(_MD("_mode_selected"), &Line2DEditor::_mode_selected);
+}
+
+void Line2DEditor::_mode_selected(int p_mode) {
+	for(unsigned int i = 0; i < _MODE_COUNT; ++i) {
+		toolbar_buttons[i]->set_pressed(i == p_mode);
+	}
+	mode = Mode(p_mode);
+}
+
+Line2DEditor::Line2DEditor(EditorNode *p_editor) {
+
+	canvas_item_editor = NULL;
+	editor = p_editor;
+	undo_redo = editor->get_undo_redo();
+
+	_dragging = false;
+
+	base_hb = memnew( HBoxContainer );
+	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(base_hb);
+
+	sep = memnew( VSeparator);
+	base_hb->add_child(sep);
+
+	{
+		ToolButton * b = memnew(ToolButton);
+		b->set_icon(EditorNode::get_singleton()->get_gui_base()->get_icon("CurveEdit", "EditorIcons"));
+		b->set_toggle_mode(true);
+		b->set_focus_mode(Control::FOCUS_NONE);
+		b->set_tooltip(
+			TTR("Select Points")+"\n"
+			+ TTR("Shift+Drag: Select Control Points")+"\n"
+			+ keycode_get_string(KEY_MASK_CMD)
+			+ TTR("Click: Add Point")+"\n"
+			+ TTR("Right Click: Delete Point"));
+		b->connect("pressed", this, "_mode_selected", varray(MODE_EDIT));
+		toolbar_buttons[MODE_EDIT] = b;
+		base_hb->add_child(b);
+	}
+
+	{
+		ToolButton * b = memnew(ToolButton);
+		b->set_icon(EditorNode::get_singleton()->get_gui_base()->get_icon("CurveCreate", "EditorIcons"));
+		b->set_toggle_mode(true);
+		b->set_focus_mode(Control::FOCUS_NONE);
+		b->set_tooltip(TTR("Add Point (in empty space)")+"\n"+TTR("Split Segment (in line)"));
+		b->connect("pressed", this, "_mode_selected", varray(MODE_CREATE));
+		toolbar_buttons[MODE_CREATE] = b;
+		base_hb->add_child(b);
+	}
+
+	{
+		ToolButton * b = memnew( ToolButton );
+		b->set_icon(EditorNode::get_singleton()->get_gui_base()->get_icon("CurveDelete", "EditorIcons"));
+		b->set_toggle_mode(true);
+		b->set_focus_mode(Control::FOCUS_NONE);
+		b->set_tooltip(TTR("Delete Point"));
+		b->connect("pressed", this, "_mode_selected", varray(MODE_DELETE));
+		toolbar_buttons[MODE_DELETE] = b;
+		base_hb->add_child(b);
+	}
+
+	base_hb->hide();
+	hide();
+
+	_mode_selected(MODE_CREATE);
+}
+
+//----------------------------------------------------------------------------
+// Line2DEditorPlugin
+//----------------------------------------------------------------------------
+
+void Line2DEditorPlugin::edit(Object *p_object) {
+	line2d_editor->edit(p_object->cast_to<Node>());
+}
+
+bool Line2DEditorPlugin::handles(Object *p_object) const {
+	return p_object->is_class("Line2D");
+}
+
+void Line2DEditorPlugin::make_visible(bool p_visible) {
+	line2d_editor->set_visible(p_visible);
+	if(p_visible == false)
+		line2d_editor->edit(NULL);
+}
+
+Line2DEditorPlugin::Line2DEditorPlugin(EditorNode *p_node) {
+	editor=p_node;
+	line2d_editor = memnew( Line2DEditor(p_node) );
+	CanvasItemEditor::get_singleton()->add_control_to_menu_panel(line2d_editor);
+	line2d_editor->hide();
+}
+
+
diff --git a/tools/editor/plugins/line_2d_editor_plugin.h b/tools/editor/plugins/line_2d_editor_plugin.h
new file mode 100644
index 0000000000..0df64208a8
--- /dev/null
+++ b/tools/editor/plugins/line_2d_editor_plugin.h
@@ -0,0 +1,85 @@
+#ifndef LINE_2D_EDITOR_PLUGIN_H
+#define LINE_2D_EDITOR_PLUGIN_H
+
+#include "tools/editor/editor_plugin.h"
+#include "tools/editor/editor_node.h"
+#include "scene/2d/path_2d.h"
+#include "scene/gui/tool_button.h"
+#include "scene/gui/button_group.h"
+#include "scene/2d/line_2d.h"
+
+
+class CanvasItemEditor;
+
+class Line2DEditor : public HBoxContainer {
+	GDCLASS(Line2DEditor, HBoxContainer)
+
+public:
+	bool forward_input_event(const InputEvent& p_event);
+	void edit(Node *p_line2d);
+	Line2DEditor(EditorNode *p_editor);
+
+protected:
+	void _node_removed(Node *p_node);
+	void _notification(int p_what);
+
+	Vector2 mouse_to_local_pos(Vector2 mpos);
+
+	static void _bind_methods();
+
+private:
+	void _mode_selected(int p_mode);
+	void _canvas_draw();
+	void _node_visibility_changed();
+
+	int get_point_index_at(Vector2 gpos);
+	Vector2 mouse_to_local_pos(Vector2 gpos, bool alt);
+
+	UndoRedo *undo_redo;
+
+	CanvasItemEditor *canvas_item_editor;
+	EditorNode *editor;
+	Panel *panel;
+	Line2D *node;
+
+	HBoxContainer *base_hb;
+	Separator *sep;
+
+	enum Mode {
+		MODE_CREATE = 0,
+		MODE_EDIT,
+		MODE_DELETE,
+		_MODE_COUNT
+	};
+
+	Mode mode;
+	ToolButton* toolbar_buttons[_MODE_COUNT];
+
+	bool _dragging;
+	int action_point;
+	Point2 moving_from;
+	Point2 moving_screen_from;
+};
+
+class Line2DEditorPlugin : public EditorPlugin {
+	GDCLASS( Line2DEditorPlugin, EditorPlugin )
+
+public:
+	virtual bool forward_canvas_input_event(const Transform2D& p_canvas_xform,const InputEvent& p_event) { return line2d_editor->forward_input_event(p_event); }
+
+	virtual String get_name() const { return "Line2D"; }
+	bool has_main_screen() const { return false; }
+	virtual void edit(Object *p_node);
+	virtual bool handles(Object *p_node) const;
+	virtual void make_visible(bool p_visible);
+
+	Line2DEditorPlugin(EditorNode *p_node);
+
+private:
+	Line2DEditor *line2d_editor;
+	EditorNode *editor;
+
+};
+
+#endif // LINE_2D_EDITOR_PLUGIN_H
+