VirtualDPad.java :  » UnTagged » prboom4android » android » game » prboom » Android Open Source

/****************************************************************************

    This file is part of Doom-for-Android.

    Doom-for-Android 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 1 of the License.

    Doom-for-Android 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.

    You should have received a copy of the GNU General Public License
    along with Doom-for-Android. If not, see http://www.gnu.org/licenses
    
****************************************************************************/

package android.game.prboom;

/**
 * Doom for Android Virtual D-Pad
 * @author cscheff
 *
 */
public class VirtualDPad {
  public final static int POS_CENTER     = 0x00;  // 0000
  public final static int POS_UP       = 0x01;  // 0001
  public final static int POS_RIGHT    = 0x02;  // 0010
  public final static int POS_DOWN    = 0x04;  // 0100
  public final static int POS_LEFT    = 0x08;  // 1000
  public final static int POS_UP_RIGHT  = 0x03;  // 0011
  public final static int POS_DOWN_RIGHT  = 0x06;  // 0110
  public final static int POS_UP_LEFT    = 0x09;  // 1001
  public final static int POS_DOWN_LEFT  = 0x0C;  // 1100
  
  // width of the virtual stick area
  public int mWidth = 0;
  // height of the virtual stick area
  public int mHeight = 0;
  // center area needs a bit of a deadzone, store that value here
  public int mDeadzone = 0;
  
  public void VirtualSitck() {
    mWidth = 0;
    mHeight = 0;
    mDeadzone = 0;
  }
  
  public VirtualDPad(int w, int h, int d) {
    mWidth = w;
    mHeight = h;
    mDeadzone = d;
  }
  
  // Hopefully the values chosen for the constants up above make some sense here.
  // I've used some boolean algebra to set the proper bits.  Sorry, that's the 
  // embedded coding side of me! :P
  public int getPosition(float x, float y) {
    int position = POS_CENTER;
    if(x < (mWidth/2 - mDeadzone))
      position |= POS_LEFT;
    else if(x > (mWidth/2 + mDeadzone))
      position |= POS_RIGHT;
    
    if(y < (mHeight/2 - mDeadzone))
      position |= POS_UP;
    else if(y > (mHeight/2 + mDeadzone))
      position |= POS_DOWN;
    
    return position;
  }
}