Android Open Source - salaya-tram-map Zoomer

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License

The source code is released under:

Unless otherwise noted, this software is Copyright 2011 Pawit Pornkitprasan and is licensed under the Simplified BSD License. Copyright 2011 Pawit Pornkitprasan. All rights reserved. Red...

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Java Source Code

package org.dyndns.pawitp.salayatrammap.map;
//  w  w  w  .  j  av  a 2s. co m
import android.view.animation.AnimationUtils;

// Inspired by Scroller
public class Zoomer {
  
  private static final int DURATION = 250;
  private static final float DURATION_RECIPROCAL = (float) 1/DURATION;
  
  private boolean mFinished = true;
  private long mStartTime;
  private float mPivotX;
  private float mPivotY;
  
  private float mCurrScale;
  private float mStartScale;
  private float mDestScale;
  private float mDeltaScale;
  
  boolean compute() {
    if (mFinished == true) {
      return false;
    }
    
    int timePassed = (int)(AnimationUtils.currentAnimationTimeMillis() - mStartTime);
    if (timePassed < DURATION) {
      float x = timePassed * DURATION_RECIPROCAL;
      
      mCurrScale = mStartScale + x * mDeltaScale;
    }
    else {
      mCurrScale = mDestScale;
      mFinished = true;
    }
    
    return true;
  }
  
  float getPivotX() {
    return mPivotX;
  }
  
  float getPivotY() {
    return mPivotY;
  }
  
  float getCurrScale() {
    return mCurrScale;
  }
  
  void zoomTo(float startScale, float destScale, float pivotX, float pivotY) {
    mFinished = false;
    mStartTime = AnimationUtils.currentAnimationTimeMillis();
    mStartScale = startScale;
    mDestScale = destScale;
    mDeltaScale = destScale - startScale;
    mPivotX = pivotX;
    mPivotY = pivotY;
  }
}

Java Source Code List