Android Open Source - BobEngine Touch

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License

The source code is released under:

GNU Lesser General Public License

Java Source Code

/**
 * BobEngine - 2D game engine for Android
 * /*from  w  w  w.  ja v a 2 s  . com*/
 * Copyright (C) 2014, 2015 Benjamin Blaszczak
 * 
 * BobEngine is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser Public License
 * version 2.1 as published by the free software foundation.
 * 
 * BobEngine is provided without warranty; without even the implied
 * warranty of merchantability or fitness for a particular 
 * purpose. See the GNU Lesser Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General
 * Public License along with BobEngine; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth
 * Floor, Boston, MA 02110-1301 USA
 * 
 */

package bobby.engine.bobengine;

import android.annotation.SuppressLint;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;

/**
 * This class listens for and handles touch input.
 * 
 * @author Ben
 * @version alpha
 */
public class Touch implements OnTouchListener {

  // Constants
  private final static int MAX_FINGERS = 10;       // The max number of fingers that can touch the screen.

  // Variables
  public int numTouches;
  public boolean held[];

  /** X positions of the pointers currently touching the screen. */
  public float X[];                                // Touch X positions
  /**
   * Y positions of the pointers currently touching the screen. (0 is at the
   * bottom of the screen)
   */
  public float Y[];                                // Touch Y positions; NOTE: 0 at the TOP of the screen. That's the opposite of the graphics.

  // Objects
  private BobView myView;                          // BobView that contains this touch listener.

  /**
   * Create a new BobEngine touch listener.
   */
  public Touch(BobView container) {
    held = new boolean[MAX_FINGERS];
    X = new float[MAX_FINGERS];
    Y = new float[MAX_FINGERS];
    myView = container;
    numTouches = 0;

    for (int i = 0; i < MAX_FINGERS; i++) {
      X[i] = -1;
      Y[i] = -1;
      held[i] = false;
    }
  }

  /**
   * Returns true if the are described by x1, y1, x2, and y2 is being touched.
   * 
   * @param x1
   *            - X coord of the top-left corner of the box
   * @param y1
   *            - Y coord of the top-left corner
   * @param x2
   *            - X coord of the bottom-right corner
   * @param y2
   *            - Y coord of teh bottom-right corner
   * @return true if touched by any finger, false otherwise
   */
  public boolean areaTouched(double x1, double y1, double x2, double y2) {
    for (int i = 0; i < numTouches; i++) {
      if (X[i] > x1 && X[i] < x2 && X[i] >= 0) {
        if (Y[i] < y1 && Y[i] > y2 && X[i] >= 0) { return true; }
      }
    }

    return false;
  }

  /**
   * Returns true if GameObject o is touched.
   * 
   * @param o
   *            - GameObject to check if is touched
   * @return True if o is being touched by any pointer, false otherwise.
   */
  public boolean objectTouched(GameObject o) {
    if (areaTouched(o.x - o.width / 2, o.y + o.height / 2, o.x + o.width / 2, o.y - o.height / 2)) { return true; }

    return false;
  }
  
  /**
   * Returns true if any pointers are currently touching the screen.
   */
  public boolean held() {
    if (held[0]) {
      return true;
    }
    
    return false;
  }
  
  /**
   * Check if a number of fingers are touching the screen.
   * 
   * @param index - the number of fingers to check
   * @return True if index number of fingers are touching the screen, false otherwise.
   */
  public boolean held(int index) {
    if (held[index]) {
      return true;
    }
    
    return false;
  }

  /**
   * Handle touch events. <br />
   * <br />
   * This method will... <br />
   * ...trigger new presses. <br />
   * ...trigger releases. <br />
   * ...get touch positions. <br />
   */
  @SuppressLint("ClickableViewAccessibility")
  @Override
  public boolean onTouch(View v, MotionEvent event) {
    // Variables
    numTouches = event.getPointerCount();            // The current number of touchs
    int index = event.getActionIndex();              // The finger that is touching the screen

    switch (event.getActionMasked() & MotionEvent.ACTION_MASK) {
    case MotionEvent.ACTION_DOWN:
      for (int i = 0; i < MAX_FINGERS; i++) {
        if(i < numTouches) {
          held[i] = true;
        } else {
          held[i] = false;
        }
      }

      X[0] = event.getX();
      Y[0] = myView.getHeight() - event.getY();

      if (myView.getCurrentRoom() != null) myView.getCurrentRoom().newpress(index);
      break;

    case MotionEvent.ACTION_MOVE:
      for (int i = 0; i < numTouches; i++) {
        X[i] = event.getX(i);
        Y[i] = myView.getHeight() - event.getY(i);
      }

      break;

    case MotionEvent.ACTION_UP:
            if (myView.getCurrentRoom() != null) myView.getCurrentRoom().released(index);

      for (int i = 0; i < MAX_FINGERS; i++) {
        if(i < numTouches - 1) {
          held[i] = true;
        } else {
          held[i] = false;
        }
      }

      numTouches = 0;
      break;

    case MotionEvent.ACTION_POINTER_DOWN:

      for (int i = 0; i < MAX_FINGERS; i++) {
        if(i < numTouches) {
          held[i] = true;
        } else {
          held[i] = false;
        }
      }

      X[index] = event.getX(index);
      Y[index] = myView.getHeight() - event.getY(index);

      if (myView.getCurrentRoom() != null) myView.getCurrentRoom().newpress(index);
      break;

    case MotionEvent.ACTION_POINTER_UP:
            if (myView.getCurrentRoom() != null) myView.getCurrentRoom().released(index);
      
      for (int i = 0; i < MAX_FINGERS; i++) {
        if(i < numTouches - 1) {
          held[i] = true;
        } else {
          held[i] = false;
        }
      }

      break;
    }

    return true;
  }
}

Java Source Code List

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