RadialPicker.java 文件源码

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    int width = canvas.getWidth();
    float height = canvas.getHeight();

    int maxValueStepsCount = mMaxValue - mMinValue + 1;

    mValueStep = (height / maxValueStepsCount);

    mRadialPaint.setMaskFilter(new BlurMaskFilter(20, BlurMaskFilter.Blur.NORMAL));
    updatePaintColorByValue();

    canvas.drawCircle(width / 2,
            height * 0.65f,
            width / 3.5f + width * 0.38f * (((float) (mValue) - mMinValue) / (mMaxValue - mMinValue)),
            mRadialPaint);

    scaleSieveIfNeeded(width);
    Paint p2 = new Paint();
    p2.setAntiAlias(true);
    canvas.drawBitmap(mSieveScaledBitmap, 0, 0, p2);

}