org.matheusdev.ror.view.EntityView.java Source code

Introduction

Here is the source code for org.matheusdev.ror.view.EntityView.java

Source

/*
 * Copyright (c) 2013 matheusdev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.matheusdev.ror.view;

import com.badlogic.gdx.graphics.g2d.Sprite;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.math.MathUtils;
import com.badlogic.gdx.math.Vector2;
import com.badlogic.gdx.physics.box2d.Body;
import org.matheusdev.ror.model.entity.Entity;

/**
 * @author matheusdev
 *
 */
public abstract class EntityView {

    public abstract void draw(SpriteBatch batch, Entity e, float delta);

    public void draw(SpriteBatch batch, Entity e, Sprite sprite, float width, float xoffset, float yoffset) {
        Body body = e.getBody();
        // Super-Duper important Box2D-Magic code:
        // This should be / is in almost every Box2D project
        // It takes the Body and the associated sprite and
        // renders the sprite properly, using the body's
        // position, rotation and origin.
        final float worldToSprite = sprite.getWidth() / width;
        final float spriteToWorld = width / sprite.getWidth();
        // Get body position:
        final float bodyX = e.getX();
        final float bodyY = e.getY();
        // Get body center:
        final Vector2 center = body.getLocalCenter();
        final Vector2 massCenter = body.getMassData().center;
        center.sub(massCenter).add(xoffset, yoffset);
        // Compute sprite-space center:
        final Vector2 spriteCenter = new Vector2(sprite.getWidth() / 2, sprite.getHeight() / 2)
                .sub((center.cpy().scl(worldToSprite)));
        // Upload to sprite:
        sprite.setScale(1f * spriteToWorld);
        sprite.setRotation(e.getRotation() * MathUtils.radiansToDegrees);
        sprite.setOrigin(spriteCenter.x, spriteCenter.y);
        sprite.setPosition(bodyX - spriteCenter.x, bodyY - spriteCenter.y);
        // Draw Sprite:
        sprite.draw(batch);
    }

}