CircleProgressBar.java 文件源码

/**
 * 绘制进度
 *
 * @param canvas 画布
 */
protected void drawProgress(Canvas canvas) {
    if (mRadius == 0 || mProgressSize == 0 || mAnimatorProgress < 0)
        return;
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(mProgressSize);
    final float halfCircleSize = mProgressSize * 0.5f;
    mRectF.set(-mRadius + halfCircleSize, -mRadius + halfCircleSize,
            mRadius - halfCircleSize, mRadius - halfCircleSize);
    SweepGradient sweepGradient = new SweepGradient(0, 0, mGradientColors, mGradientPositions);
    mRotateMatrix.setRotate(mStartAngle, 0, 0);
    sweepGradient.setLocalMatrix(mRotateMatrix);
    mPaint.setShader(sweepGradient);
    canvas.save();
    canvas.drawArc(mRectF, mStartAngle, mAnimatorProgressAngle, false, mPaint);
    canvas.restore();
}