Android Open Source - clash_of_balls Menu Background

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From Project

Back to project page clash_of_balls.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2012-2013 Hans Hardmeier <hanshardmeier@gmail.com>
 * Copyright (C) 2012-2013 Andrin Jenal/*from  ww w  .j  a v  a2s . c o  m*/
 * Copyright (C) 2012-2013 Beat Kng <beat-kueng@gmx.net>
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 3 of the License.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 */

package com.sapos_aplastados.game.clash_of_balls.menu;

import android.opengl.GLES20;

import com.sapos_aplastados.game.clash_of_balls.Texture;
import com.sapos_aplastados.game.clash_of_balls.VertexBufferFloat;
import com.sapos_aplastados.game.clash_of_balls.game.GameObject;
import com.sapos_aplastados.game.clash_of_balls.game.RenderHelper;
import com.sapos_aplastados.game.clash_of_balls.game.Vector;

/**
 * Background of a Menu: spans a texture over the screen
 *
 */
public class MenuBackground extends GameObject {
  
  private Texture m_texture;
  private float m_aspect_ratio;
  private Vector m_size=new Vector();
  
  public void setAspect(float aspect) { m_aspect_ratio = aspect; }
  public float aspect() { return m_aspect_ratio; }
  
  private float m_color[] = new float[4];
  private VertexBufferFloat m_position_data;
  
  //aspect_ratio is texture width/height
  public MenuBackground(Texture t, float aspect_ratio) {
    m_texture = t;
    m_aspect_ratio = aspect_ratio;
    
    m_position_data = new VertexBufferFloat(VertexBufferFloat.sprite_position_data, 3);
    RenderHelper.initColorArray(0xffffffff, m_color);
  }

  public void draw(RenderHelper renderer) {
    //texture
    renderer.shaderManager().activateTexture(0);
    m_texture.useTexture(renderer);
    
    //position & size
    getViewport(renderer.m_screen_width, renderer.m_screen_height
        , m_position, m_size);
    
    //translate & scale to fit screen
    renderer.pushModelMat();
    renderer.modelMatTranslate(m_position.x, m_position.y, 0.f);
    renderer.modelMatScale(m_size.x, m_size.y, 0.f);
    
    int position_handle = renderer.shaderManager().a_Position_handle;
    if(position_handle != -1)
      m_position_data.apply(position_handle);
    
        
        // color
    int color_handle = renderer.shaderManager().u_Color_handle;
    if(color_handle != -1)
      GLES20.glUniform4fv(color_handle, 1, m_color, 0);
        
    
    renderer.apply();
    
        // Draw
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);                               
        
        renderer.popModelMat();
  }
  
  //get menu viewport: this depends on screen aspect ratio
  public void getViewport(float screen_width, float screen_height
      , Vector pos, Vector size) {
    
    //touch screen border from inside
    float screen_aspect = screen_width / screen_height;
    if(screen_aspect > m_aspect_ratio) {
      size.y = screen_height;
      pos.y = 0.f;
      size.x = m_aspect_ratio * screen_height;
      pos.x = (screen_width-size.x) / 2.f;
    } else {
      size.x = screen_width;
      pos.x = 0.f;
      size.y = screen_width / m_aspect_ratio;
      pos.y = (screen_height-size.y) / 2.f;
    }
  }

  public void move(float dsec) {
    // nothing to do
  }
}

Java Source Code List

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