Android 模拟圆形水杯倒水的效果

来源：互联网发布：大尺度网络电影编辑：程序博客网时间：2024/04/27 16:51
先看下效果，离我的想达到的效果还比较远
主要是原理是不断改变贝塞尔曲线的控制点（改变path即可）
效果为从百分之0到百分70然后改变颜色，水最终停留在百分之20，百分比计算不准确的，只是大概而已
下面是源码，但是没有完善
package com.example.myapp;import android.content.Context;import android.graphics.*;import android.util.AttributeSet;import android.util.Log;import android.view.View;import android.widget.ImageView;import java.lang.ref.WeakReference;/** * Created by jiangwj on 2015/3/18. */public class WaveView extends ImageView {    private Paint mPaint;    private Xfermode mXfermode = new PorterDuffXfermode(PorterDuff.Mode.DST_IN);    private float waveY;//起始点以及重点的y    private float ctrolX,ctrolY;//控制点的y    private float mWidth,mHeight;    private Path mPath;// 路径对象    private boolean isAdd;//水平增加    private boolean isUp;//向上增加    private Bitmap markBitmap;    private boolean isAni=true;    private int distHeight;//目标高度    private float percent;//百分比    public WaveView(Context context, AttributeSet attrs) {        super(context, attrs);        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG| Paint.DITHER_FLAG);        mPaint.setColor(0xcce1162e);        // 不使用硬件加速        setLayerType(LAYER_TYPE_SOFTWARE, null);        //mPaint.setMaskFilter(new EmbossMaskFilter(new float[] { 1, 1, 1F }, 0.1F, 0.1F, 10F));        mPaint.setMaskFilter(new BlurMaskFilter(10, BlurMaskFilter.Blur.SOLID));        mPath = new Path();        mXfermode=new PorterDuffXfermode(PorterDuff.Mode.DST_IN);    }    public void addAnimotion(){        percent= (float) (1-ctrolY/mHeight);        if(percent>=0.7f) {            mPaint.setColor(0xcc11ff24);            setDist(20);        }        if (ctrolX >= mWidth + 1 / 4F * mWidth) {            isAdd = false;        }else if (ctrolX <= -1 / 4F * mWidth) {            isAdd = true;        }        ctrolX = isAdd ? ctrolX + mWidth/10: ctrolX - mWidth/10;        changeHeight();        postInvalidate();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)    {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        /**         * 如果类型是圆形，则强制改变view的宽高一致         */        int width = Math.min(getMeasuredWidth(), getMeasuredHeight());        setMeasuredDimension(width, width);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        mWidth = w;        mHeight = h;        //控制点的Y,其实为高度为0        ctrolY = mHeight;        //起点终点的Y        waveY =  ctrolY+mHeight/10;        setDist(70);    }    public void setPath(){        mPath.moveTo(-1 / 4F * mWidth, waveY);//起点        mPath.quadTo(ctrolX, ctrolY, mWidth + 1 / 4F * mWidth, waveY);//二阶贝塞尔曲线        mPath.lineTo(mWidth + 1 / 4F * mWidth, mHeight);        mPath.lineTo(-1 / 4F * mWidth, mHeight);        mPath.close();    }    @Override    protected void onDraw(Canvas canvas) {        if(markBitmap==null){            markBitmap=getMarkBitmap();        }        setPath();//生成图案路径        //图层        int sc = canvas.saveLayer(0, 0, mWidth, mHeight, null, Canvas.ALL_SAVE_FLAG);        canvas.drawPath(mPath, mPaint);//水波        mPaint.setXfermode(mXfermode);        canvas.drawBitmap(markBitmap,0,0,mPaint);        mPaint.setXfermode(null);        canvas.restoreToCount(sc);        mPath.reset();//重置图案路径        if(isAni){//是否开启动画            addAnimotion();        }    }    //设置当前百分比    public void setDist(int percent){        distHeight= (int) (mHeight*(100-percent)/100);    }    public void changeHeight(){        if(ctrolY<distHeight){//现在的高度大于目标高度            ctrolY +=1;            waveY += 1;        }        if(ctrolY>=distHeight){            ctrolY -=1;            waveY -= 1;        }    }    //覆盖层的圆形    public Bitmap getMarkBitmap()    {        Bitmap bitmap = Bitmap.createBitmap(getWidth(), getHeight(),                Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(bitmap);        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG| Paint.DITHER_FLAG);        paint.setColor(Color.BLACK);       // paint.setMaskFilter(new BlurMaskFilter(5, BlurMaskFilter.Blur.SOLID));            canvas.drawCircle(mWidth/2, mWidth/ 2, mWidth / 2, paint);        return bitmap;    }}
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