godot/scene/2d/position_2d.cpp

/*************************************************************************/
/*  position_2d.cpp                                                      */
/*************************************************************************/
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#include "position_2d.h"

const real_t DEFAULT_GIZMO_EXTENTS = 10.0;

void Position2D::_draw_cross() {
	const real_t extents = get_gizmo_extents();

	// Add more points to create a "hard stop" in the color gradient.
	PackedVector2Array points_x = {
		Point2(+extents, 0),
		Point2(),
		Point2(),
		Point2(-extents, 0)
	};

	PackedVector2Array points_y = {
		Point2(0, +extents),
		Point2(),
		Point2(),
		Point2(0, -extents)
	};

	// Use the axis color which is brighter for the positive axis.
	// Use a darkened axis color for the negative axis.
	// This makes it possible to see in which direction the Position3D node is rotated
	// (which can be important depending on how it's used).
	// Axis colors are taken from `axis_x_color` and `axis_y_color` (defined in `editor/editor_themes.cpp`).
	const Color color_x = Color(0.96, 0.20, 0.32);
	PackedColorArray colors_x = {
		color_x,
		color_x,
		color_x.lerp(Color(0, 0, 0), 0.5),
		color_x.lerp(Color(0, 0, 0), 0.5)
	};
	draw_multiline_colors(points_x, colors_x);

	const Color color_y = Color(0.53, 0.84, 0.01);
	PackedColorArray colors_y = {
		color_y,
		color_y,
		color_y.lerp(Color(0, 0, 0), 0.5),
		color_y.lerp(Color(0, 0, 0), 0.5)
	};
	draw_multiline_colors(points_y, colors_y);
}

#ifdef TOOLS_ENABLED
Rect2 Position2D::_edit_get_rect() const {
	real_t extents = get_gizmo_extents();
	return Rect2(Point2(-extents, -extents), Size2(extents * 2, extents * 2));
}

bool Position2D::_edit_use_rect() const {
	return false;
}
#endif

void Position2D::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_ENTER_TREE: {
			update();
		} break;

		case NOTIFICATION_DRAW: {
			if (!is_inside_tree()) {
				break;
			}
			if (Engine::get_singleton()->is_editor_hint()) {
				_draw_cross();
			}
		} break;
	}
}

void Position2D::set_gizmo_extents(real_t p_extents) {
	if (p_extents == DEFAULT_GIZMO_EXTENTS) {
		set_meta("_gizmo_extents_", Variant());
	} else {
		set_meta("_gizmo_extents_", p_extents);
	}

	update();
}

real_t Position2D::get_gizmo_extents() const {
	if (has_meta("_gizmo_extents_")) {
		return get_meta("_gizmo_extents_");
	} else {
		return DEFAULT_GIZMO_EXTENTS;
	}
}

void Position2D::_bind_methods() {
	ClassDB::bind_method(D_METHOD("_set_gizmo_extents", "extents"), &Position2D::set_gizmo_extents);
	ClassDB::bind_method(D_METHOD("_get_gizmo_extents"), &Position2D::get_gizmo_extents);

	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "gizmo_extents", PROPERTY_HINT_RANGE, "0,1000,0.1,or_greater", PROPERTY_USAGE_EDITOR | PROPERTY_USAGE_INTERNAL), "_set_gizmo_extents", "_get_gizmo_extents");
}

Position2D::Position2D() {
}