/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.tests.examples;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.GL20;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.Vector3;
import com.badlogic.gdx.tests.utils.GdxTest;

/** Demonstrates how to let a sprite follow a finger touching the screen.
 * 
 * @author mzechner */
public class MoveSpriteExample extends GdxTest {
	Texture texture;
	SpriteBatch batch;
	OrthographicCamera camera;
	Vector3 spritePosition = new Vector3();

	public void create () {
		// create a SpriteBatch with which to render the sprite
		batch = new SpriteBatch();

		// load the sprite's texture. note: usually you have more than
		// one sprite in a texture, see {@see TextureAtlas} and {@see TextureRegion}.
		texture = new Texture(Gdx.files.internal("data/bobargb8888-32x32.png"));

		// create an {@link OrthographicCamera} which is used to transform
		// touch coordinates to world coordinates.
		camera = new OrthographicCamera();

		// we want the camera to setup a viewport with pixels as units, with the
		// y-axis pointing upwards. The origin will be in the lower left corner
		// of the screen.
		camera.setToOrtho(false);
	}

	public void render () {
		// set the clear color and clear the screen.
		Gdx.gl.glClearColor(1, 1, 1, 1);
		Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

		// draw the sprite
		batch.begin();
		batch.draw(texture, spritePosition.x, spritePosition.y);
		batch.end();

		// if a finger is down, set the sprite's x/y coordinate.
		if (Gdx.input.isTouched()) {
			// the unproject method takes a Vector3 in window coordinates (origin in
			// upper left corner, y-axis pointing down) and transforms it to world
			// coordinates.
			camera.unproject(spritePosition.set(Gdx.input.getX(), Gdx.input.getY(), 0));
		}
	}
}