Mega Code Archive
Animation Interpolator
<![CDATA[
//package org.ametro.util;
import android.graphics.PointF;
public class AnimationInterpolator {
public final static int SCALE = 1;
public final static int SCROLL = 2;
public final static int SCALE_AND_SCROLL = 3;
private PointF mStartPoint = new PointF();
private PointF mEndPoint = new PointF();
private PointF mNowPoint = new PointF();
private float mStartScale;
private float mEndScale;
private long mPeriod;
private long mEndTime;
private long mNowTime;
private int mMode;
public void begin(PointF startPoint, PointF endPoint, Float startScale, Float endScale, long time){
this.mNowTime = System.currentTimeMillis();
this.mEndTime = mNowTime + time;
this.mPeriod = time;
this.mMode = 0;
if(startScale!=null && endScale!=null){
this.mStartScale = startScale;
this.mEndScale = endScale;
this.mMode |= SCALE;
}
if(startPoint!=null && endPoint!=null){
this.mStartPoint.set(startPoint);
this.mEndPoint.set(endPoint);
this.mNowPoint.set(startPoint);
this.mMode |= SCROLL;
}
}
public void begin(float startScale, float endScale, long time){
begin(null,null,startScale, endScale, time);
}
public void begin(PointF startPoint, PointF endPoint, long time){
begin(startPoint, endPoint, null, null, time);
}
public boolean more(){
return mNowTime < mEndTime;
}
public void next(){
mNowTime = System.currentTimeMillis();
}
public PointF getPoint(){
if(mNowTime < mEndTime){
float k = getProgress();
float x = mEndPoint.x - k * (mEndPoint.x - mStartPoint.x);
float y = mEndPoint.y - k * (mEndPoint.y - mStartPoint.y);
mNowPoint.set(x, y);
return mNowPoint;
}else{
return mEndPoint;
}
}
public float getScale(){
if(mNowTime < mEndTime){
float k = getProgress();
return (mEndScale - k * (mEndScale - mStartScale));
}else{
return mEndScale;
}
}
private float getProgress() {
return (float)(mEndTime - mNowTime) / mPeriod;
}
public boolean hasScale() {
return (mMode & SCALE)!=0;
}
public boolean hasScroll() {
return (mMode & SCROLL)!=0;
}
}
]]>