Android Open Source - customhellochartdemo Chart Viewport Animator V8

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Back to project page customhellochartdemo.

License

The source code is released under:

Apache License

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Java Source Code

package lecho.lib.hellocharts.animation;
/*  w w  w.ja  va2 s  . c  o  m*/
import lecho.lib.hellocharts.DummyChartAnimationListener;
import lecho.lib.hellocharts.model.Viewport;
import lecho.lib.hellocharts.view.Chart;
import android.os.Handler;
import android.os.SystemClock;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.Interpolator;

public class ChartViewportAnimatorV8 implements ChartViewportAnimator {

  long start;
  boolean isAnimationStarted = false;
  final Chart chart;
  private Viewport startViewport = new Viewport();
  private Viewport targetViewport = new Viewport();
  private Viewport newViewport = new Viewport();
  final long duration;
  final Handler handler;
  final Interpolator interpolator = new AccelerateDecelerateInterpolator();
  private ChartAnimationListener animationListener = new DummyChartAnimationListener();
  private final Runnable runnable = new Runnable() {

    @Override
    public void run() {
      long elapsed = SystemClock.uptimeMillis() - start;
      if (elapsed > duration) {
        isAnimationStarted = false;
        handler.removeCallbacks(runnable);
        chart.setCurrentViewport(targetViewport, false);
        animationListener.onAnimationFinished();
        return;
      }
      float scale = Math.min(interpolator.getInterpolation((float) elapsed / duration), 1);
      float diffLeft = (targetViewport.left - startViewport.left) * scale;
      float diffTop = (targetViewport.top - startViewport.top) * scale;
      float diffRight = (targetViewport.right - startViewport.right) * scale;
      float diffBottom = (targetViewport.bottom - startViewport.bottom) * scale;
      newViewport.set(startViewport.left + diffLeft, startViewport.top + diffTop,
          startViewport.right + diffRight, startViewport.bottom + diffBottom);
      chart.setCurrentViewport(newViewport, false);

      handler.postDelayed(this, 16);
    }
  };

  public ChartViewportAnimatorV8(Chart chart) {
    this(chart, FAST_ANIMATION_DURATION);
  }

  public ChartViewportAnimatorV8(Chart chart, long duration) {
    this.chart = chart;
    this.duration = duration;
    this.handler = new Handler();
  }

  @Override
  public void startAnimation(Viewport startViewport, Viewport targetViewport) {
    this.startViewport.set(startViewport);
    this.targetViewport.set(targetViewport);
    isAnimationStarted = true;
    animationListener.onAnimationStarted();
    start = SystemClock.uptimeMillis();
    handler.post(runnable);
  }

  @Override
  public void cancelAnimation() {
    isAnimationStarted = false;
    handler.removeCallbacks(runnable);
    chart.setCurrentViewport(targetViewport, false);
    animationListener.onAnimationFinished();
  }

  @Override
  public boolean isAnimationStarted() {
    return isAnimationStarted;
  }

  @Override
  public void setChartAnimationListener(ChartAnimationListener animationListener) {
    if (null == animationListener) {
      this.animationListener = new DummyChartAnimationListener();
    } else {
      this.animationListener = animationListener;
    }
  }
}

Java Source Code List