水波动画
今天讲讲以前项目的一个动画，先看看效果
---
原理：正弦曲线y=asin(bα+c)+m;
a:控制振幅 b:控制波长 c:控制轴偏移 m:控制y轴偏移 α：角度
思路：画出波的path，通过动画控制振幅a达到水波的起伏效果
控制c的值达到移动效果
<com.example.ck.waveanimation.WaveView
android:id="@+id/waveline"
android:background="#999"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
//监听硬币偏移量
WaveView waveView= (WaveView) findViewById(R.id.waveline);
waveView.setWaveHeightListener(new WaveView.WaveHeightListener() {
@Override
public void currentWaveHeightMove(float currentWavePercent) {
Log.i("WaveView", "currentWaveHeightScal: "+currentWavePercent);
}
});
在非EXACTLY模式下，默认一个高度
if (heightMeasureMode == MeasureSpec.AT_MOST || heightMeasureMode == MeasureSpec.UNSPECIFIED) {
heightMeaure = dp2px(DEFAULT_HEIGHT);
heightMeasureSpec = MeasureSpec.makeMeasureSpec(heightMeaure, MeasureSpec.EXACTLY);
}
在onSizeChanged获取一些初始值
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
viewHeight = h;
viewWidth = w;
viewCenterY = 2 * viewHeight / 3;
waveAmplifier = (waveAmplifier * 2 > viewHeight) ? (viewHeight / 2) : waveAmplifier;
waveAnim();
}
各个波的path路径绘制出来
path1.reset();
path2.reset();
path3.reset();
path1.moveTo(0, viewCenterY - waveAmplifier * getRoundRate(wavePhase, waveFrequency, -1));
path2.moveTo(0, viewCenterY - 1.3f * waveAmplifier2 * getRoundRate(wavePhase + 90, waveFrequency, -1));
path3.moveTo(0, viewCenterY + waveAmplifier2 * getRoundRate(wavePhase, waveFrequency, -1));
for (int i = 0; i < viewWidth - 1; i++) {
path1.lineTo((float) (i + 1), viewCenterY - waveAmplifier * getRoundRate(wavePhase, waveFrequency, (i + 1)));
path2.lineTo((float) (i + 1), viewCenterY - 1.3f * waveAmplifier2 * getRoundRate(wavePhase + 90, 0.8f * waveFrequency, (i + 1)));
path3.lineTo((float) (i + 1), viewCenterY + waveAmplifier2 * getRoundRate(wavePhase, waveFrequency, -1));
}
path1.lineTo(viewWidth, viewHeight + 5);
path2.lineTo(viewWidth, viewHeight);
path3.lineTo(viewWidth, viewHeight);
path1.lineTo(0, viewHeight + 5);
path2.lineTo(0, viewHeight);
path3.lineTo(0, viewHeight);
path1.close();
path2.close();
path3.close();
draw path以及硬币
wavePaint.setColor(0xc0ffffff);
canvas.drawPath(path1, wavePaint);
wavePaint.setColor(0xB0ffffff);
canvas.drawPath(path2, wavePaint);
wavePaint.setColor(0xffffffff);
canvas.drawBitmap(bitmap, viewWidth / 2 - bitmap.getWidth() / 2, viewCenterY - 1.3f * waveAmplifier *
getRoundRate(wavePhase + 90, waveFrequency * 0.8f, (viewWidth / 2 + 1)) - bitmap.getHeight() + 20, wavePaint);
wavePaint.setColor(0x80ffffff);
canvas.drawPath(path3, wavePaint);
动画的控制
public void waveAnim() {
set = new AnimatorSet();
//控制平移
ValueAnimator valueAnimator = ValueAnimator.ofFloat(1.F, 0F);
valueAnimator.setDuration(3000);
valueAnimator.setRepeatMode(ValueAnimator.RESTART);
valueAnimator.setRepeatCount(ValueAnimator.INFINITE);
valueAnimator.setInterpolator(new LinearInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
Float aFloat = Float.valueOf(animation.getAnimatedValue().toString());
wavePhase = 360.F * aFloat;
if (waveHeightListener != null) {
waveHeightListener.currentWaveHeightMove(1.3f * waveAmplifier * getRoundRate(wavePhase + 90, waveFrequency * 0.8f, (viewWidth / 2 + 1)));
}
invalidate();
}
});
//控制振幅
ValueAnimator valueAnimator2 = ValueAnimator.ofFloat(1.F, 0F);
valueAnimator2.setDuration(4000);
valueAnimator2.setRepeatMode(ValueAnimator.REVERSE);
valueAnimator2.setRepeatCount(ValueAnimator.INFINITE);
valueAnimator2.setInterpolator(new LinearInterpolator());
valueAnimator2.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
Float aFloat = Float.valueOf(animation.getAnimatedValue().toString());
waveAmplifier = 10f + 10 * aFloat;
waveAmplifier2 = 20f + 10 * (1f - aFloat);
}
});
set.playTogether(valueAnimator, valueAnimator2);
set.start();
}