Improvements to Gradient2D Editor

editor/plugins/gradient_texture_2d_editor_plugin.cpp

@@ -39,145 +39,191 @@
 #include "scene/gui/flow_container.h"
 #include "scene/gui/separator.h"
 
-Point2 GradientTexture2DEditorRect::_get_handle_position(const Handle p_handle) {
+void GradientTexture2DEdit::_on_mouse_exited() {
+	if (hovered != HANDLE_NONE) {
+		hovered = HANDLE_NONE;
+		queue_redraw();
+	}
+}
+
+Point2 GradientTexture2DEdit::_get_handle_pos(const Handle p_handle) {
 	// Get the handle's mouse position in pixels relative to offset.
-	return (p_handle == HANDLE_FILL_FROM ? texture->get_fill_from() : texture->get_fill_to()).clamp(Vector2(), Vector2(1, 1)) * size;
+	return (p_handle == HANDLE_FROM ? texture->get_fill_from() : texture->get_fill_to()).clamp(Vector2(), Vector2(1, 1)) * size;
 }
 
-void GradientTexture2DEditorRect::_update_fill_position() {
-	if (handle == HANDLE_NONE) {
-		return;
+GradientTexture2DEdit::Handle GradientTexture2DEdit::get_handle_at(const Vector2 &p_pos) {
+	Point2 from_pos = _get_handle_pos(HANDLE_FROM);
+	Point2 to_pos = _get_handle_pos(HANDLE_TO);
+	// If both handles are at the position, grab the one that's closer.
+	if (p_pos.distance_squared_to(from_pos) < p_pos.distance_squared_to(to_pos)) {
+		return Rect2(from_pos.round() - handle_size / 2, handle_size).has_point(p_pos) ? HANDLE_FROM : HANDLE_NONE;
+	} else {
+		return Rect2(to_pos.round() - handle_size / 2, handle_size).has_point(p_pos) ? HANDLE_TO : HANDLE_NONE;
 	}
+}
 
-	// Update the texture's fill_from/fill_to property based on mouse input.
-	Vector2 percent = ((get_local_mouse_position() - offset) / size).clamp(Vector2(), Vector2(1, 1));
-	if (snap_enabled) {
-		percent = (percent - Vector2(0.5, 0.5)).snapped(Vector2(snap_size, snap_size)) + Vector2(0.5, 0.5);
+void GradientTexture2DEdit::set_fill_pos(const Vector2 &p_pos) {
+	if (p_pos.is_equal_approx(initial_grab_pos)) {
+		return;
 	}
 
-	String property_name = handle == HANDLE_FILL_FROM ? "fill_from" : "fill_to";
-
+	const StringName property_name = (grabbed == HANDLE_FROM) ? "fill_from" : "fill_to";
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
-	undo_redo->create_action(vformat(TTR("Set %s"), property_name), UndoRedo::MERGE_ENDS);
-	undo_redo->add_do_property(texture.ptr(), property_name, percent);
-	undo_redo->add_undo_property(texture.ptr(), property_name, handle == HANDLE_FILL_FROM ? texture->get_fill_from() : texture->get_fill_to());
+	undo_redo->create_action(TTR("Move GradientTexture2D Fill Point"));
+	undo_redo->add_do_property(texture.ptr(), property_name, p_pos);
+	undo_redo->add_undo_property(texture.ptr(), property_name, initial_grab_pos);
 	undo_redo->commit_action();
 }
 
-void GradientTexture2DEditorRect::gui_input(const Ref<InputEvent> &p_event) {
-	// Grab/release handle.
+void GradientTexture2DEdit::gui_input(const Ref<InputEvent> &p_event) {
 	const Ref<InputEventMouseButton> mb = p_event;
-	if (mb.is_valid() && mb->get_button_index() == MouseButton::LEFT) {
-		if (mb->is_pressed()) {
-			Point2 mouse_position = mb->get_position() - offset;
-			if (Rect2(_get_handle_position(HANDLE_FILL_FROM).round() - handle_size / 2, handle_size).has_point(mouse_position)) {
-				handle = HANDLE_FILL_FROM;
-			} else if (Rect2(_get_handle_position(HANDLE_FILL_TO).round() - handle_size / 2, handle_size).has_point(mouse_position)) {
-				handle = HANDLE_FILL_TO;
+	if (mb.is_valid()) {
+		if (mb->get_button_index() == MouseButton::LEFT) {
+			if (mb->is_pressed()) {
+				grabbed = get_handle_at(mb->get_position() - offset);
+
+				if (grabbed != HANDLE_NONE) {
+					initial_grab_pos = _get_handle_pos(grabbed) / size;
+					queue_redraw();
+				}
 			} else {
-				handle = HANDLE_NONE;
+				// Release the handle.
+				if (grabbed != HANDLE_NONE) {
+					set_fill_pos(_get_handle_pos(grabbed) / size);
+					grabbed = HANDLE_NONE;
+					queue_redraw();
+				}
 			}
-		} else {
-			_update_fill_position();
-			handle = HANDLE_NONE;
+		}
+
+		if (grabbed != HANDLE_NONE && mb->is_pressed() && mb->get_button_index() == MouseButton::RIGHT) {
+			texture->set((grabbed == HANDLE_FROM) ? SNAME("fill_from") : SNAME("fill_to"), initial_grab_pos);
+			grabbed = HANDLE_NONE;
+			queue_redraw();
 		}
 	}
 
 	// Move handle.
 	const Ref<InputEventMouseMotion> mm = p_event;
 	if (mm.is_valid()) {
-		_update_fill_position();
+		Vector2 mpos = mm->get_position() - offset;
+
+		Handle handle_at_mpos = get_handle_at(mpos);
+		if (hovered != handle_at_mpos) {
+			hovered = handle_at_mpos;
+			queue_redraw();
+		}
+
+		if (grabbed == HANDLE_NONE) {
+			return;
+		}
+
+		Vector2 new_pos = (mpos / size).clamp(Vector2(0, 0), Vector2(1, 1));
+		if (snap_enabled || mm->is_ctrl_pressed()) {
+			new_pos = new_pos.snapped(Vector2(1.0 / snap_count, 1.0 / snap_count));
+		}
+
+		// Allow to snap to an axis with Shift.
+		if (mm->is_shift_pressed()) {
+			Vector2 initial_mpos = initial_grab_pos * size;
+			if (Math::abs(mpos.x - initial_mpos.x) > Math::abs(mpos.y - initial_mpos.y)) {
+				new_pos.y = initial_grab_pos.y;
+			} else {
+				new_pos.x = initial_grab_pos.x;
+			}
+		}
+		// Do it directly from the texture so there's no undo/redo until the handle is released.
+		texture->set((grabbed == HANDLE_FROM) ? SNAME("fill_from") : SNAME("fill_to"), new_pos);
 	}
 }
 
-void GradientTexture2DEditorRect::set_texture(Ref<GradientTexture2D> &p_texture) {
+void GradientTexture2DEdit::set_texture(Ref<GradientTexture2D> &p_texture) {
 	texture = p_texture;
 	texture->connect("changed", callable_mp((CanvasItem *)this, &CanvasItem::queue_redraw));
 }
 
-void GradientTexture2DEditorRect::set_snap_enabled(bool p_snap_enabled) {
+void GradientTexture2DEdit::set_snap_enabled(bool p_snap_enabled) {
 	snap_enabled = p_snap_enabled;
 	queue_redraw();
+	if (texture.is_valid()) {
+		if (snap_enabled) {
+			texture->set_meta(SNAME("_snap_enabled"), true);
+		} else {
+			texture->remove_meta(SNAME("_snap_enabled"));
+		}
+	}
 }
 
-void GradientTexture2DEditorRect::set_snap_size(float p_snap_size) {
-	snap_size = p_snap_size;
+void GradientTexture2DEdit::set_snap_count(int p_snap_count) {
+	snap_count = p_snap_count;
 	queue_redraw();
+	if (texture.is_valid()) {
+		if (snap_count != GradientTexture2DEditor::DEFAULT_SNAP) {
+			texture->set_meta(SNAME("_snap_count"), snap_count);
+		} else {
+			texture->remove_meta(SNAME("_snap_count"));
+		}
+	}
 }
 
-void GradientTexture2DEditorRect::_notification(int p_what) {
+void GradientTexture2DEdit::_notification(int p_what) {
 	switch (p_what) {
 		case NOTIFICATION_ENTER_TREE:
+			connect("mouse_exited", callable_mp(this, &GradientTexture2DEdit::_on_mouse_exited));
+			[[fallthrough]];
 		case NOTIFICATION_THEME_CHANGED: {
 			checkerboard->set_texture(get_theme_icon(SNAME("GuiMiniCheckerboard"), SNAME("EditorIcons")));
 		} break;
-
 		case NOTIFICATION_DRAW: {
-			if (texture.is_null()) {
-				return;
-			}
-
-			const Ref<Texture2D> fill_from_icon = get_theme_icon(SNAME("EditorPathSmoothHandle"), SNAME("EditorIcons"));
-			const Ref<Texture2D> fill_to_icon = get_theme_icon(SNAME("EditorPathSharpHandle"), SNAME("EditorIcons"));
-			handle_size = fill_from_icon->get_size();
-
-			Size2 rect_size = get_size();
-
-			// Get the size and position to draw the texture and handles at.
-			// Subtract handle sizes so they stay inside the preview, but keep the texture's aspect ratio.
-			Size2 available_size = rect_size - handle_size;
-			Size2 ratio = available_size / texture->get_size();
-			size = MIN(ratio.x, ratio.y) * texture->get_size();
-			offset = ((rect_size - size) / 2).round();
-
-			checkerboard->set_rect(Rect2(offset, size));
-
-			draw_set_transform(offset);
-			draw_texture_rect(texture, Rect2(Point2(), size));
-
-			// Draw grid snap lines.
-			if (snap_enabled) {
-				const Color primary_line_color = Color(0.5, 0.5, 0.5, 0.9);
-				const Color line_color = Color(0.5, 0.5, 0.5, 0.5);
+			_draw();
+		} break;
+	}
+}
 
-				// Draw border and centered axis lines.
-				draw_rect(Rect2(Point2(), size), primary_line_color, false);
-				draw_line(Point2(size.width / 2, 0), Point2(size.width / 2, size.height), primary_line_color);
-				draw_line(Point2(0, size.height / 2), Point2(size.width, size.height / 2), primary_line_color);
+void GradientTexture2DEdit::_draw() {
+	if (texture.is_null()) {
+		return;
+	}
 
-				// Draw vertical lines.
-				int prev_idx = 0;
-				for (int x = 0; x < size.width; x++) {
-					int idx = int((x / size.width - 0.5) / snap_size);
+	const Ref<Texture2D> fill_from_icon = get_theme_icon(SNAME("EditorPathSmoothHandle"), SNAME("EditorIcons"));
+	const Ref<Texture2D> fill_to_icon = get_theme_icon(SNAME("EditorPathSharpHandle"), SNAME("EditorIcons"));
+	handle_size = fill_from_icon->get_size();
 
-					if (x > 0 && prev_idx != idx) {
-						draw_line(Point2(x, 0), Point2(x, size.height), line_color);
-					}
+	Size2 rect_size = get_size();
 
-					prev_idx = idx;
-				}
+	// Get the size and position to draw the texture and handles at.
+	// Subtract handle sizes so they stay inside the preview, but keep the texture's aspect ratio.
+	Size2 available_size = rect_size - handle_size;
+	Size2 ratio = available_size / texture->get_size();
+	size = MIN(ratio.x, ratio.y) * texture->get_size();
+	offset = ((rect_size - size) / 2).round();
 
-				// Draw horizontal lines.
-				prev_idx = 0;
-				for (int y = 0; y < size.height; y++) {
-					int idx = int((y / size.height - 0.5) / snap_size);
+	checkerboard->set_rect(Rect2(offset, size));
 
-					if (y > 0 && prev_idx != idx) {
-						draw_line(Point2(0, y), Point2(size.width, y), line_color);
-					}
+	draw_set_transform(offset);
+	draw_texture_rect(texture, Rect2(Point2(), size));
 
-					prev_idx = idx;
-				}
-			}
+	// Draw grid snap lines.
+	if (snap_enabled || (Input::get_singleton()->is_key_pressed(Key::CTRL) && grabbed != HANDLE_NONE)) {
+		const Color line_color = Color(0.5, 0.5, 0.5, 0.5);
 
-			// Draw handles.
-			draw_texture(fill_from_icon, (_get_handle_position(HANDLE_FILL_FROM) - handle_size / 2).round());
-			draw_texture(fill_to_icon, (_get_handle_position(HANDLE_FILL_TO) - handle_size / 2).round());
-		} break;
+		for (int idx = 0; idx < snap_count + 1; idx++) {
+			float x = float(idx * size.width) / snap_count;
+			float y = float(idx * size.height) / snap_count;
+			draw_line(Point2(x, 0), Point2(x, size.height), line_color);
+			draw_line(Point2(0, y), Point2(size.width, y), line_color);
+		}
 	}
+
+	// Draw handles.
+	const Color focus_modulate = Color(0.5, 1, 2);
+	bool modulate_handle_from = grabbed == HANDLE_FROM || (grabbed != HANDLE_FROM && hovered == HANDLE_FROM);
+	bool modulate_handle_to = grabbed == HANDLE_TO || (grabbed != HANDLE_TO && hovered == HANDLE_TO);
+	draw_texture(fill_from_icon, (_get_handle_pos(HANDLE_FROM) - handle_size / 2).round(), modulate_handle_from ? focus_modulate : Color(1, 1, 1));
+	draw_texture(fill_to_icon, (_get_handle_pos(HANDLE_TO) - handle_size / 2).round(), modulate_handle_to ? focus_modulate : Color(1, 1, 1));
 }
 
-GradientTexture2DEditorRect::GradientTexture2DEditorRect() {
+GradientTexture2DEdit::GradientTexture2DEdit() {
 	checkerboard = memnew(TextureRect);
 	checkerboard->set_stretch_mode(TextureRect::STRETCH_TILE);
 	checkerboard->set_expand_mode(TextureRect::EXPAND_IGNORE_SIZE);
@@ -189,6 +235,8 @@ GradientTexture2DEditorRect::GradientTexture2DEditorRect() {
 
 ///////////////////////
 
+const int GradientTexture2DEditor::DEFAULT_SNAP = 10;
+
 void GradientTexture2DEditor::_reverse_button_pressed() {
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	undo_redo->create_action(TTR("Swap GradientTexture2D Fill Points"));
@@ -201,12 +249,11 @@ void GradientTexture2DEditor::_reverse_button_pressed() {
 
 void GradientTexture2DEditor::_set_snap_enabled(bool p_enabled) {
 	texture_editor_rect->set_snap_enabled(p_enabled);
-
-	snap_size_edit->set_visible(p_enabled);
+	snap_count_edit->set_visible(p_enabled);
 }
 
-void GradientTexture2DEditor::_set_snap_size(float p_snap_size) {
-	texture_editor_rect->set_snap_size(MAX(p_snap_size, 0.01));
+void GradientTexture2DEditor::_set_snap_count(int p_snap_count) {
+	texture_editor_rect->set_snap_count(p_snap_count);
 }
 
 void GradientTexture2DEditor::set_texture(Ref<GradientTexture2D> &p_texture) {
@@ -221,6 +268,11 @@ void GradientTexture2DEditor::_notification(int p_what) {
 			reverse_button->set_icon(get_theme_icon(SNAME("ReverseGradient"), SNAME("EditorIcons")));
 			snap_button->set_icon(get_theme_icon(SNAME("SnapGrid"), SNAME("EditorIcons")));
 		} break;
+		case NOTIFICATION_READY: {
+			// Set snapping settings based on the texture's meta.
+			snap_button->set_pressed(texture->get_meta("_snap_enabled", false));
+			snap_count_edit->set_value(texture->get_meta("_snap_count", DEFAULT_SNAP));
+		} break;
 	}
 }
 
@@ -241,21 +293,20 @@ GradientTexture2DEditor::GradientTexture2DEditor() {
 	toolbar->add_child(snap_button);
 	snap_button->connect("toggled", callable_mp(this, &GradientTexture2DEditor::_set_snap_enabled));
 
-	snap_size_edit = memnew(EditorSpinSlider);
-	snap_size_edit->set_min(0.01);
-	snap_size_edit->set_max(0.5);
-	snap_size_edit->set_step(0.01);
-	snap_size_edit->set_value(0.1);
-	snap_size_edit->set_custom_minimum_size(Size2(65 * EDSCALE, 0));
-	toolbar->add_child(snap_size_edit);
-	snap_size_edit->connect("value_changed", callable_mp(this, &GradientTexture2DEditor::_set_snap_size));
+	snap_count_edit = memnew(EditorSpinSlider);
+	snap_count_edit->set_min(2);
+	snap_count_edit->set_max(100);
+	snap_count_edit->set_value(DEFAULT_SNAP);
+	snap_count_edit->set_custom_minimum_size(Size2(65 * EDSCALE, 0));
+	toolbar->add_child(snap_count_edit);
+	snap_count_edit->connect("value_changed", callable_mp(this, &GradientTexture2DEditor::_set_snap_count));
 
-	texture_editor_rect = memnew(GradientTexture2DEditorRect);
+	texture_editor_rect = memnew(GradientTexture2DEdit);
 	add_child(texture_editor_rect);
 
 	set_mouse_filter(MOUSE_FILTER_STOP);
 	_set_snap_enabled(snap_button->is_pressed());
-	_set_snap_size(snap_size_edit->get_value());
+	_set_snap_count(snap_count_edit->get_value());
 }
 
 ///////////////////////

editor/plugins/gradient_texture_2d_editor_plugin.h

@@ -37,39 +37,48 @@
 class Button;
 class EditorSpinSlider;
 
-class GradientTexture2DEditorRect : public Control {
-	GDCLASS(GradientTexture2DEditorRect, Control);
+class GradientTexture2DEdit : public Control {
+	GDCLASS(GradientTexture2DEdit, Control);
 
 	enum Handle {
 		HANDLE_NONE,
-		HANDLE_FILL_FROM,
-		HANDLE_FILL_TO
+		HANDLE_FROM,
+		HANDLE_TO
 	};
 
 	Ref<GradientTexture2D> texture;
 	bool snap_enabled = false;
-	float snap_size = 0;
+	int snap_count = 0;
 
 	TextureRect *checkerboard = nullptr;
 
-	Handle handle = HANDLE_NONE;
+	Handle hovered = HANDLE_NONE;
+	Handle grabbed = HANDLE_NONE;
+	Point2 initial_grab_pos;
+
 	Size2 handle_size;
 	Point2 offset;
 	Size2 size;
 
-	Point2 _get_handle_position(const Handle p_handle);
-	void _update_fill_position();
+	Point2 _get_handle_pos(const Handle p_handle);
+	Handle get_handle_at(const Vector2 &p_pos);
+	void set_fill_pos(const Vector2 &p_pos);
+
 	virtual void gui_input(const Ref<InputEvent> &p_event) override;
 
+	void _on_mouse_exited();
+
+	void _draw();
+
 protected:
 	void _notification(int p_what);
 
 public:
 	void set_texture(Ref<GradientTexture2D> &p_texture);
 	void set_snap_enabled(bool p_snap_enabled);
-	void set_snap_size(float p_snap_size);
+	void set_snap_count(int p_snap_count);
 
-	GradientTexture2DEditorRect();
+	GradientTexture2DEdit();
 };
 
 class GradientTexture2DEditor : public VBoxContainer {
@@ -79,17 +88,18 @@ class GradientTexture2DEditor : public VBoxContainer {
 
 	Button *reverse_button = nullptr;
 	Button *snap_button = nullptr;
-	EditorSpinSlider *snap_size_edit = nullptr;
-	GradientTexture2DEditorRect *texture_editor_rect = nullptr;
+	EditorSpinSlider *snap_count_edit = nullptr;
+	GradientTexture2DEdit *texture_editor_rect = nullptr;
 
 	void _reverse_button_pressed();
 	void _set_snap_enabled(bool p_enabled);
-	void _set_snap_size(float p_snap_size);
+	void _set_snap_count(int p_snap_count);
 
 protected:
 	void _notification(int p_what);
 
 public:
+	static const int DEFAULT_SNAP;
 	void set_texture(Ref<GradientTexture2D> &p_texture);
 
 	GradientTexture2DEditor();