Android Open Source - BoxSorter Square

• Back to Animation/custom  ↑

From Project

Back to project page BoxSorter.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.silverhillapps.boxsorter.subviews;
//from   www .  j ava2  s.  c om
import com.silverhillapps.boxsorter.conf.Conf;
import com.silverhillapps.boxsorter.utils.Utils;
import com.silverhillapps.boxsorter.views.BoxCanvasView;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.util.Log;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.ScaleGestureDetector;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

/**
 * This is the class which represents the square figure
 * @author salva
 *
 */
public class Square extends View implements Figure {

  private Paint mFigurePaint;
  private int mXPos ;
  private int mYPos;
  private int mDimension;
  private Rect mRect;
  private Context mContext;
  private int mColor;

  private float tempXpos;
  private float tempYpos;

  private boolean deleted = false;
  private boolean scaling = false;

  private GestureDetector gestureDetector; // Gesture detector for fling and double tap
  private ScaleGestureDetector scaleDetector; // Gesture detector for scaling


  public Square(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.mContext = context;
    init();
    recalculateRect();
  }

  /**
   * This method initializes the square with the paint object as well as the gesture detectors
   */
  private void init() {
    mFigurePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    mFigurePaint.setColor(Color.BLUE);
    mFigurePaint.setAntiAlias(true);

    gestureDetector = new GestureDetector(mContext, new BSDetector());
    scaleDetector = new ScaleGestureDetector(mContext, new ScaleListener());

  }

  /**
   * The method used for drawing the figure in the canvas
   */
  protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);

    canvas.drawRect(mRect , mFigurePaint);

  }

  /**
   * Method for deleting the figure from canvas  
   */
  @Override
  public void delete(boolean animate) {
    ((BoxCanvasView)getParent()).removeElement(this);

  }


  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

    setMeasuredDimension(mDimension, mDimension);
  }

  /**
   * This method calculates the rect of the figure  
   */
  private void recalculateRect() {
    mRect = new Rect(0, 0, mDimension, mDimension);
  }

  /**
   * Position setter
   */
  @Override
  public void setPosition(int x, int y) {
    this.mXPos = x;
    this.mYPos = y;

    recalculateRect();
    invalidate();
  }

  /**
   * color setter
   */
  @Override
  public void setColor(int color) {
    this.mColor = color;
    mFigurePaint.setColor(color);
    invalidate();

  }

  /**
   * Dimension setter  
   */
  @Override
  public void setDimension(int dim) {
    this.mDimension = dim;

    this.invalidate();

  }

  /**
   * Method for unwrapping the view from the figure structure
   */
  @Override
  public View getView() {
    // TODO Auto-generated method stub
    return this;
  }

  /*
   * Position and dimension getters
   */
  @Override
  public int getLeftPosition() {
    // TODO Auto-generated method stub
    return mXPos;
  }

  @Override
  public int getTopPosition() {
    // TODO Auto-generated method stub
    return mYPos;
  }

  @Override
  public int getSize() {
    return mDimension;
  }


  /**
   * Method responsible of managing the touch events
   */
  @Override
  public boolean onTouchEvent(MotionEvent event) {

    if(!deleted){
      manageMove(event); // manages the move 
      gestureDetector.onTouchEvent(event); // manages the double tap and fling
      scaleDetector.onTouchEvent(event); // manages the scale
      // The rotate was not developed, but it would be included as a new detector here 
    }

    return true;
  }

  /**
   * Method responsible of managing the move interaction in ui
   * @param event
   */
  private void manageMove(MotionEvent event) {

    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
      tempXpos = (int)event.getRawX();
      tempYpos = (int)event.getRawY();
      scaling = false;
      break;
    case MotionEvent.ACTION_MOVE:
      if(!scaling){
        float deltax = event.getRawX()-tempXpos;
        float deltay = (event.getRawY()-tempYpos); 

        mXPos+=deltax;
        mYPos+= deltay;
        tempXpos = event.getRawX();
        tempYpos = event.getRawY();

        isInsideActionArea();
        
        this.invalidate();
        ((ViewGroup)this.getParent()).requestLayout();
      }
      break;
    case MotionEvent.ACTION_UP:
      break;

    }
  }


  /**
   * This method determines if the figure is located in the action area for being deleted
   */
  private void isInsideActionArea() {

    int squareXCenter = mXPos+(mDimension/2);
    int squareYCenter = mYPos+(mDimension/2);
    int actionArea = mDimension;

    if((Math.pow(squareXCenter-Conf.CIRCLE_CENTER_X_POS,2) + Math.pow(squareYCenter-Conf.CIRCLE_CENTER_Y_POS,2))<(actionArea*actionArea)){
      deleted = true;
      delete(false);
    }


  }

  /*
   * Delete getter and setters
   * @see com.silverhillapps.boxsorter.subviews.Figure#isDeleted()
   */
  @Override
  public boolean isDeleted() {
    return deleted;
  }

  @Override
  public void setDeleted(boolean deleted) {
    // TODO Auto-generated method stub
    this.deleted = deleted;
  }


  /**
   * Private class for managing the scaling over the figure
   * @author salva
   *
   */
  private class ScaleListener extends ScaleGestureDetector.SimpleOnScaleGestureListener {
    @Override
    public boolean onScale(ScaleGestureDetector detector) {
      float scale = detector.getScaleFactor();
      int newDimension = (int)(mDimension*scale);
      // Scaling restrictions
      newDimension = newDimension>Conf.MINIMUM_DIMENSION_ELEMENTS?newDimension:Conf.MINIMUM_DIMENSION_ELEMENTS;
      newDimension = newDimension<Conf.MAXIMUM_DIMENSION_ELEMENTS?newDimension:Conf.MAXIMUM_DIMENSION_ELEMENTS;

      mDimension = newDimension;
      
      //Update ui
      recalculateRect();
      scaling = true;
      invalidate();
      ((ViewGroup)getParent()).requestLayout();

      return true;
    }

  }

  /**
   * Class for managing the fling and double tap
   * @author salva
   *
   */
  private class BSDetector extends GestureDetector.SimpleOnGestureListener{
    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
        float velocityY) {
      
      //The fling is not developed, but it takes the velocity and direction vector here and send it to parent canvas for creating the animation
      return true;

    }


    /**
     * Double tap 
     */
    @Override
    public boolean onDoubleTap(MotionEvent e) {

      setColor(Utils.randomColor());

      return true;
    }

  }


}

Java Source Code List

• Back to Animation/custom  ↑