FontDropShadow.java

package mingdx;

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.Texture;
import com.badlogic.gdx.graphics.g2d.BitmapFont;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.graphics.g2d.freetype.FreeTypeFontGenerator;
import com.badlogic.gdx.graphics.glutils.ShaderProgram;
import com.badlogic.gdx.utils.GdxRuntimeException;

public class FontDropShadow implements ApplicationListener {
	
	SpriteBatch batch;
	OrthographicCamera cam;
	BitmapFont font;
	TextureRegion sprite;
	
	//the offset for your font
	final float SHADOW_OFFSET = 3f;
	
	//the number of times to render your shadow silhouettes
	final int SHADOW_STEPS = 2;
	
	@Override
	public void create() {
		shader = createDefaultShader();
		batch = new SpriteBatch();
		cam = new OrthographicCamera();
		sprite = new TextureRegion(new Texture("data/cat4.png"));
		
		FreeTypeFontGenerator g = new FreeTypeFontGenerator(Gdx.files.internal("data/testfont.ttf"));
		font = g.generateFont(26);
	}

	@Override
	public void dispose() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void pause() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void render() {
		Gdx.gl.glClearColor(0.5f,0.5f,0.5f,1f);
		Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT);
		batch.begin();
		
		shadowFont("testing one two three lazy dog", 25, 25, Color.WHITE);
		
		shadowSprite(sprite, 100, 100, Color.WHITE);
		
		batch.end();
	}
	
	void shadowFont(String s, float x, float y, Color color) {
		int steps = SHADOW_STEPS + 1;
		for (int i=1; i<steps; i++) {
			float a = 1f - i/(float)steps;
			float off = SHADOW_OFFSET * a;
			
			font.setColor(0f, 0f, 0f, 1f - a);
			font.draw(batch, s, x+off, y-off);
						
		}
		font.setColor(color);
		font.draw(batch, s, x, y);		
	}
	
	void shadowSprite(TextureRegion sprite, float x, float y, Color color) {
		int steps = SHADOW_STEPS + 1;
		for (int i=1; i<steps; i++) {
			float a = 1f - i/(float)steps;
			float off = SHADOW_OFFSET * a;
			
			batch.setColor(0f, 0f, 0f, 1f - a);
			batch.draw(sprite, x+off, y-off);
						
		}
		batch.setColor(color);
		batch.draw(sprite, x, y);
	}

	@Override
	public void resize(int width, int height) {
		cam.setToOrtho(false);
		batch.setProjectionMatrix(cam.combined);
	}

	@Override
	public void resume() {		
	}

}