SampleGame.java

package nEx.Games.Samples;

import com.badlogic.gdx.ApplicationListener;
import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Color;
import com.badlogic.gdx.graphics.GL10;
import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.Texture.TextureFilter;
import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;

public class SampleGame implements ApplicationListener {
	private OrthographicCamera camera;
	private SpriteBatch batch;
	private Texture texture;
	private TextureRegion region;
	
	private float[] vertices = new float[20];
	
	Color begin = new Color(Color.BLUE);
	Color end = new Color(1, 0.5f, 0, 1);
	
	@Override
	public void create() {		
		camera = new OrthographicCamera(1, 1);
		batch = new SpriteBatch();
		
		// For example purposes, create a pixmap to use for our gradient
		Pixmap pix = new Pixmap(2, 2, Pixmap.Format.RGBA8888);
		pix.setColor(1,1,1,1);
		pix.fillRectangle(0, 0, 2, 2);
		
		texture = new Texture(pix);
		
		region = new TextureRegion(texture, 0, 0, 2, 2);
		
	}

	@Override
	public void dispose() {
		batch.dispose();
		texture.dispose();
	}

	float inc = 0.1f;
	@Override
	public void render() {		
		Gdx.gl.glClearColor(1, 1, 1, 1);
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		
		setupGradient();
		
		batch.setProjectionMatrix(camera.combined);
		batch.begin();
		batch.draw(texture, vertices, 0, 20);
		batch.end();
		
		// Animate the gradient a bit, because it is fun
		begin.r += inc * Gdx.graphics.getDeltaTime();
		end.b = 0.5f - begin.r;
		if (begin.r > 0.5f) {
			begin.r = 0.5f;
			inc *= -1;
		}
		if (begin.r < 0) {
			begin.r = 0;
			inc *= -1;
		}
	}

	@Override
	public void resize(int width, int height) {
	}

	@Override
	public void pause() {
	}

	@Override
	public void resume() {
	}
	
	public void setupGradient() {
		
		float color1 = begin.toFloatBits();
		float color2 = end.toFloatBits();
		
		vertices[SpriteBatch.X1] = -0.45f;
		vertices[SpriteBatch.Y1] = +0.45f;
		vertices[SpriteBatch.C1] = color1;
		vertices[SpriteBatch.U1] = region.getU();
		vertices[SpriteBatch.V1] = region.getV();

		vertices[SpriteBatch.X2] = +0.45f;
		vertices[SpriteBatch.Y2] = +0.45f;
		vertices[SpriteBatch.C2] = color1;
		vertices[SpriteBatch.U2] = region.getU2();
		vertices[SpriteBatch.V2] = region.getV();

		vertices[SpriteBatch.X3] = +0.45f;
		vertices[SpriteBatch.Y3] = -0.45f;
		vertices[SpriteBatch.C3] = color2;
		vertices[SpriteBatch.U3] = region.getU2();
		vertices[SpriteBatch.V3] = region.getV2();

		vertices[SpriteBatch.X4] = -0.45f;
		vertices[SpriteBatch.Y4] = -0.45f;
		vertices[SpriteBatch.C4] = color2;
		vertices[SpriteBatch.U4] = region.getU();
		vertices[SpriteBatch.V4] = region.getV2();
	}
}