godot/scene/2d/parallax_layer.cpp

/*************************************************************************/
/*  parallax_layer.cpp                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
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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;


	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;

	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_position();
			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_position(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() {

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

	ADD_GROUP("Motion","motion_");
	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);
}