package com.wang.avi.indicators;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.animation.ValueAnimator;
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import com.wang.avi.Indicator;
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import java.util.ArrayList;
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/**
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* Created by Jack on 2015/10/20.
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*/
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public class BallSpinFadeLoaderIndicator extends Indicator {
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public static final float SCALE=1.0f;
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public static final int ALPHA=255;
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float[] scaleFloats=new float[]{SCALE,
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SCALE,
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SCALE,
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SCALE,
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SCALE,
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SCALE,
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SCALE,
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SCALE};
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int[] alphas=new int[]{ALPHA,
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ALPHA,
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ALPHA,
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ALPHA,
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ALPHA,
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ALPHA,
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ALPHA,
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ALPHA};
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@Override
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public void draw(Canvas canvas, Paint paint) {
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float radius=getWidth()/10;
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for (int i = 0; i < 8; i++) {
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canvas.save();
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Point point=circleAt(getWidth(),getHeight(),getWidth()/2-radius,i*(Math.PI/4));
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canvas.translate(point.x,point.y);
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canvas.scale(scaleFloats[i],scaleFloats[i]);
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paint.setAlpha(alphas[i]);
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canvas.drawCircle(0,0,radius,paint);
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canvas.restore();
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}
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}
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@Override
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public ArrayList<ValueAnimator> onCreateAnimators() {
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ArrayList<ValueAnimator> animators=new ArrayList<>();
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int[] delays= {0, 120, 240, 360, 480, 600, 720, 780, 840};
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for (int i = 0; i < 8; i++) {
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final int index=i;
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ValueAnimator scaleAnim=ValueAnimator.ofFloat(1,0.4f,1);
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scaleAnim.setDuration(1000);
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scaleAnim.setRepeatCount(-1);
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scaleAnim.setStartDelay(delays[i]);
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addUpdateListener(scaleAnim,new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animation) {
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scaleFloats[index] = (float) animation.getAnimatedValue();
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postInvalidate();
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}
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});
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ValueAnimator alphaAnim=ValueAnimator.ofInt(255, 77, 255);
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alphaAnim.setDuration(1000);
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alphaAnim.setRepeatCount(-1);
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alphaAnim.setStartDelay(delays[i]);
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addUpdateListener(alphaAnim,new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animation) {
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alphas[index] = (int) animation.getAnimatedValue();
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postInvalidate();
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}
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});
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animators.add(scaleAnim);
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animators.add(alphaAnim);
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}
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return animators;
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}
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/**
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* 圆O的圆心为(a,b),半径为R,点A与到X轴的为角α.
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*则点A的坐标为(a+R*cosα,b+R*sinα)
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* @param width
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* @param height
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* @param radius
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* @param angle
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* @return
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*/
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Point circleAt(int width,int height,float radius,double angle){
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float x= (float) (width/2+radius*(Math.cos(angle)));
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float y= (float) (height/2+radius*(Math.sin(angle)));
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return new Point(x,y);
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}
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final class Point{
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public float x;
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public float y;
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public Point(float x, float y){
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this.x=x;
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this.y=y;
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}
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}
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}
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