godot/scene/2d/parallax_layer.cpp

/*************************************************************************/
/*  parallax_layer.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2018 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2018 Godot Engine contributors (cf. AUTHORS.md)    */
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#include "parallax_layer.h"
#include "parallax_background.h"

void ParallaxLayer::set_motion_scale(const Size2 &p_scale) {

	motion_scale = p_scale;

	if (!get_parent())
		return;

	ParallaxBackground *pb = get_parent()->cast_to<ParallaxBackground>();
	if (is_inside_tree() && pb) {
		Vector2 ofs = pb->get_final_offset();
		float scale = pb->get_scroll_scale();
		set_base_offset_and_scale(ofs, scale);
	}
}

Size2 ParallaxLayer::get_motion_scale() const {

	return motion_scale;
}

void ParallaxLayer::set_motion_offset(const Size2 &p_offset) {

	motion_offset = p_offset;

	if (!get_parent())
		return;

	ParallaxBackground *pb = get_parent()->cast_to<ParallaxBackground>();
	if (is_inside_tree() && pb) {
		Vector2 ofs = pb->get_final_offset();
		float scale = pb->get_scroll_scale();
		set_base_offset_and_scale(ofs, scale);
	}
}

Size2 ParallaxLayer::get_motion_offset() const {

	return motion_offset;
}

void ParallaxLayer::_update_mirroring() {

	if (!get_parent())
		return;

	ParallaxBackground *pb = get_parent()->cast_to<ParallaxBackground>();
	if (pb) {

		RID c = pb->get_world_2d()->get_canvas();
		RID ci = get_canvas_item();
		VisualServer::get_singleton()->canvas_set_item_mirroring(c, ci, mirroring);
	}
}

void ParallaxLayer::set_mirroring(const Size2 &p_mirroring) {

	mirroring = p_mirroring;
	if (mirroring.x < 0)
		mirroring.x = 0;
	if (mirroring.y < 0)
		mirroring.y = 0;

	_update_mirroring();
}

Size2 ParallaxLayer::get_mirroring() const {

	return mirroring;
}

void ParallaxLayer::_notification(int p_what) {

	switch (p_what) {

		case NOTIFICATION_ENTER_TREE: {

			orig_offset = get_pos();
			orig_scale = get_scale();
			_update_mirroring();
		} break;
	}
}

void ParallaxLayer::set_base_offset_and_scale(const Point2 &p_offset, float p_scale) {

	if (!is_inside_tree())
		return;
	if (get_tree()->is_editor_hint())
		return;
	Point2 new_ofs = ((orig_offset + p_offset) * motion_scale) * p_scale + motion_offset;

	if (mirroring.x) {
		double den = mirroring.x * p_scale;
		new_ofs.x -= den * ceil(new_ofs.x / den);
	}

	if (mirroring.y) {
		double den = mirroring.y * p_scale;
		new_ofs.y -= den * ceil(new_ofs.y / den);
	}

	set_pos(new_ofs);
	set_scale(Vector2(1, 1) * p_scale);
}

String ParallaxLayer::get_configuration_warning() const {

	if (!get_parent() || !get_parent()->cast_to<ParallaxBackground>()) {
		return TTR("ParallaxLayer node only works when set as child of a ParallaxBackground node.");
	}

	return String();
}

void ParallaxLayer::_bind_methods() {

	ObjectTypeDB::bind_method(_MD("set_motion_scale", "scale"), &ParallaxLayer::set_motion_scale);
	ObjectTypeDB::bind_method(_MD("get_motion_scale"), &ParallaxLayer::get_motion_scale);
	ObjectTypeDB::bind_method(_MD("set_motion_offset", "offset"), &ParallaxLayer::set_motion_offset);
	ObjectTypeDB::bind_method(_MD("get_motion_offset"), &ParallaxLayer::get_motion_offset);
	ObjectTypeDB::bind_method(_MD("set_mirroring", "mirror"), &ParallaxLayer::set_mirroring);
	ObjectTypeDB::bind_method(_MD("get_mirroring"), &ParallaxLayer::get_mirroring);

	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion/scale"), _SCS("set_motion_scale"), _SCS("get_motion_scale"));
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion/offset"), _SCS("set_motion_offset"), _SCS("get_motion_offset"));
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "motion/mirroring"), _SCS("set_mirroring"), _SCS("get_mirroring"));
}

ParallaxLayer::ParallaxLayer() {
	motion_scale = Size2(1, 1);
}