【安卓笔记】仿猎豹清理大师波浪效果

package com.example.wavedemo1;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.View;
/*** @author Rowandjj**仿猎豹清理大师波浪效果*/
public class WaterWaveView extends View
{private Handler mHandler;private long c = 0L;private boolean mStarted = false;private final float f = 0.033F;private int mAlpha = 70;//透明度private int mColor = Color.BLUE;private float mAmplitude = 6.0F; // 振幅private final Paint mPaint = new Paint();private float mWateLevel = 0.5F;//水高(0~1)private Path mPath;public WaterWaveView(Context paramContext){super(paramContext);init(paramContext);}public WaterWaveView(Context paramContext, AttributeSet paramAttributeSet){super(paramContext, paramAttributeSet);init(paramContext);}/*** 开始波动*/public void startWave(){if (!mStarted){this.c = 0L;mStarted = true;this.mHandler.sendEmptyMessage(0);}}private void init(Context context){mPaint.setStrokeWidth(1.0F);mPaint.setColor(mColor);mPaint.setAlpha(mAlpha);mPath = new Path();mHandler = new Handler(){@Overridepublic void handleMessage(android.os.Message msg){if (msg.what == 0){invalidate();if (mStarted){//不断发消息给自己，使自己不断被重绘mHandler.sendEmptyMessageDelayed(0, 60L);}}}};}@Overrideprotected void onDraw(Canvas canvas){canvas.save();mPaint.setAlpha(mAlpha);mPaint.setColor(mColor);// 得到控件的宽高int width = getWidth();int height = getHeight();// 如果未开始（未调用startWave方法）,绘制一个矩形if ((!mStarted) || (width == 0) || (height == 0)){canvas.drawRect(0.0F, height / 2, width, height, mPaint);return;}if (this.c >= 8388607L){this.c = 0L;}//每次onDraw时c都会自增this.c = (1L + this.c);float f1 = height * (1.0F - mWateLevel);int top = (int) (f1 + mAmplitude);mPath.reset();// 绘制矩形,即水面静止时的高度canvas.drawRect(0.0F, top, width, height, mPaint);int startX = 0;//波浪效果while (startX < width){int startY = (int) (f1 - mAmplitude* Math.sin(Math.PI* (2.0F * (startX + this.c * width * this.f))/ width));canvas.drawLine(startX, startY, startX, top, mPaint);startX++;}canvas.restore();}/*** 设置振幅* @param amplitued*/public void setAmplitude(float amplitued){mAmplitude = amplitued;}/*** 设置透明度* @param alpha*/public void setWaterAlpha(float alpha){this.mAlpha = ((int) (255.0F * alpha));mPaint.setAlpha(this.mAlpha);}/*** 设置颜色* @param color*/public void setColor(int color){this.mColor = color;}/*** 设置水面高度* @param paramFloat*/public void setWaterLevel(float paramFloat){mWateLevel = paramFloat;}@Overrideprotected void onAttachedToWindow(){super.onAttachedToWindow();// 关闭硬件加速，防止异常unsupported operation exceptionthis.setLayerType(View.LAYER_TYPE_SOFTWARE, null);}
}