Android Open Source - GravityShip Scrolling Background

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License

The source code is released under:

GNU General Public License

Java Source Code

/*******************************************************************************
 * Copyright 2013 Jn Hajnr./*from   w  ww  .  java2s.  co m*/
 *
 * 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.hajnar.GravityShip;

import com.badlogic.gdx.graphics.OrthographicCamera;
import com.badlogic.gdx.graphics.Texture;
import com.badlogic.gdx.graphics.g2d.SpriteBatch;
import com.badlogic.gdx.graphics.g2d.TextureRegion;
import com.badlogic.gdx.math.Vector2;

public class ScrollingBackground {

    private OrthographicCamera camera;
    private Vector2[] textureCoords;
    private float x;
    private float y;
    private int textureWidth;
    private SpriteBatch batch;
    private TextureRegion textureRegion;
    private int tilesCountX;
    private int tilesCountY;

    public ScrollingBackground(OrthographicCamera camera, Texture texture, SpriteBatch batch) {
        if (texture.getWidth() == 256) {
            this.tilesCountX = 6;
            this.tilesCountY = 4;
        }
        if (texture.getWidth() == 512) {
            this.tilesCountX = 5;
            this.tilesCountY = 4;
        }
        this.textureRegion = new TextureRegion(texture);
        this.batch = batch;
        this.textureCoords = new Vector2[tilesCountX * tilesCountY];
        this.camera = camera;
        this.textureWidth = texture.getWidth();
        this.x = camera.frustum.planePoints[0].x;
        this.y = camera.frustum.planePoints[0].y;
        int index = 0;
        for (int i = 0; i < tilesCountY; i++) {
            for (int j = 0; j < tilesCountX; j++) {
                textureCoords[index] = new Vector2(x + (j * textureWidth), y + (i * textureWidth));
                index++;
            }
        }
    }

    public ScrollingBackground(OrthographicCamera camera, TextureRegion textureRegion, SpriteBatch batch) {
        if (textureRegion.getRegionWidth() == 256) {
            this.tilesCountX = 6;
            this.tilesCountY = 4;
        }
        if (textureRegion.getRegionWidth() == 512) {
            this.tilesCountX = 5;
            this.tilesCountY = 4;
        }
        this.textureRegion = textureRegion;
        this.batch = batch;
        this.textureCoords = new Vector2[tilesCountX * tilesCountY];
        this.camera = camera;
        this.textureWidth = textureRegion.getRegionWidth();
        this.x = camera.frustum.planePoints[0].x;
        this.y = camera.frustum.planePoints[0].y;
        int index = 0;
        for (int i = 0; i < tilesCountY; i++) {
            for (int j = 0; j < tilesCountX; j++) {
                textureCoords[index] = new Vector2(x + (j * textureWidth), y + (i * textureWidth));
                index++;
            }
        }
    }

    public void updateBackground() {

        for (int i = 0; i < textureCoords.length; i++) {
            if (textureCoords[i].x < camera.frustum.planePoints[0].x - textureWidth) {
                textureCoords[i].set(textureCoords[i].x + (tilesCountX) * textureWidth, textureCoords[i].y);
            } else if (textureCoords[i].x > camera.frustum.planePoints[1].x) {
                textureCoords[i].set(textureCoords[i].x - (tilesCountX) * textureWidth, textureCoords[i].y);
            } else if (textureCoords[i].y < camera.frustum.planePoints[0].y - textureWidth) {
                textureCoords[i].set(textureCoords[i].x, textureCoords[i].y + (tilesCountY) * textureWidth);
            } else if (textureCoords[i].y > camera.frustum.planePoints[3].y) {
                textureCoords[i].set(textureCoords[i].x, textureCoords[i].y - (tilesCountY) * textureWidth);
            }
            textureCoords[i].set((float) (textureCoords[i].x), (float) (textureCoords[i].y));
        }
    }

    public void render() {
        for (int i = 0; i < tilesCountX * tilesCountY; i++) {
            batch.draw(textureRegion, textureCoords[i].x, textureCoords[i].y);
        }
    }

}

Java Source Code List

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