/*
 * RenderContext.cpp
 *
 *  Created on: Nov 30, 2016
 *      Author: tibi
 */

#include <components/basic/Camera.h>
#include <graphics/RenderContext.h>
#include <model/GameObject.h>

using namespace farmlands::components::basic;
using namespace farmlands::model;

namespace farmlands {
namespace graphics {

float RenderContext::xToWorld(float x)
{
	float cellW = viewport.pixelsPerUnitX * m_camera->scale;
	return (x - viewport.width / 2) / cellW + m_cameraObj->transform.x;
}

float RenderContext::yToWorld(float y)
{
	float cellH = viewport.pixelsPerUnitY * m_camera->scale;
	return (y - viewport.height / 2) / cellH + m_cameraObj->transform.y;
}

float RenderContext::xToScreen(float x)
{
	float cellW = viewport.pixelsPerUnitX * m_camera->scale;
	return (x - m_cameraObj->transform.x) * cellW + viewport.width / 2;
}

float RenderContext::yToScreen(float y)
{
	float cellH = viewport.pixelsPerUnitY * m_camera->scale;
	return (y - m_cameraObj->transform.y) * cellH + viewport.height / 2;
}

bool RenderContext::visible(SDL_Rect& rect)
{
	SDL_Rect screen = { 0, 0, viewport.width, viewport.height };
	return SDL_HasIntersection(&screen, &rect);
}

void RenderContext::setCamera(GameObject* camera)
{
	m_cameraObj = camera;
	m_camera = camera->component<Camera>();
}

}
}