Android Open Source - block-composer U I Element Picture

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License

The source code is released under:

MIT License

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Java Source Code

package bwr.blockcomposer.ui;
/*ww w  .  j  a va2s  .com*/
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;

import javax.microedition.khronos.opengles.GL10;

import bwr.blockcomposer.GameResources;
import bwr.blockcomposer.R;

import android.content.Context;

public class UIElementPicture implements UIElement {
  public final int id;
  public final int x, y, width, height;
  public boolean hidden = false;
  
  public final IntBuffer mVertexBuffer;
  public final ByteBuffer mIndexBuffer;
  private IntBuffer textureBuffer;
    
  public static final int BUTTON_UP = 0;
  public static final int BUTTON_DOWN = 1;
  public static final int BUTTON_LEFT = 2;
  public static final int BUTTON_RIGHT = 3;
  
  final int textureVertices[][] = {
    {    0,     0,  // UP
       0, 1<<16,
     1<<16, 1<<16,
     1<<16,     0, },
    {1<<16, 1<<16,  // DOWN
     1<<16,     0,
         0,     0,
         0, 1<<16, },
        {    0,     0,  // LEFT
     1<<16,     0,
       1<<16, 1<<16,
         0, 1<<16, },
    {1<<16, 1<<16,  // RIGHT
         0, 1<<16,
       0,     0,
     1<<16,     0 },
  };
  
  public UIElementPicture(int id, int x, int y, int width, int height, int direction) {
    this.id = id;
    this.x = x;
    this.y = y;
    this.width = width;
    this.height = height;
    
    final int vertices[] = {
        x<<16, y<<16, 0,
        x<<16, (y-height)<<16, 0,
        (x+width)<<16, (y-height)<<16, 0,
        (x+width)<<16, y<<16, 0
    };
    
      final byte indices[] = {
          0, 1, 2,
          0, 2, 3
      };
    
    ByteBuffer tmp = ByteBuffer.allocateDirect(vertices.length*4);
    tmp.order(ByteOrder.nativeOrder());
    mVertexBuffer = tmp.asIntBuffer();
    mVertexBuffer.put(vertices);
    mVertexBuffer.position(0);
    
    tmp = ByteBuffer.allocateDirect(textureVertices[direction].length * 4);
    tmp.order(ByteOrder.nativeOrder());
    textureBuffer = tmp.asIntBuffer();
    textureBuffer.put(textureVertices[direction]);
    textureBuffer.position(0);
    
        mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
        mIndexBuffer.put(indices);
        mIndexBuffer.position(0);
  }

  
  public boolean isHit(int x, int y) {
    return x >= this.x && x <= (this.x+width) && y<=this.y && y >= (this.y-height);
  }
  
  public void draw(GL10 gl, GameResources gameResources) {
    gameResources.bindTexture(gl, R.drawable.up);

        gl.glVertexPointer(3, GL10.GL_FIXED, 0, mVertexBuffer);
    gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, textureBuffer);
        gl.glDrawElements(GL10.GL_TRIANGLES, 6, GL10.GL_UNSIGNED_BYTE, mIndexBuffer);
  }


  public void update(Context context, GL10 gl, long dt) {
    // nothing
  }


  public int getId() {
    return id;
  }
  
}

Java Source Code List