MaterialProgressDrawable.java 文件源码

private void drawTriangle(Canvas c, float startAngle, float sweepAngle, Rect bounds) {
    if (this.mShowArrow) {
        if (this.mArrow == null) {
            this.mArrow = new Path();
            this.mArrow.setFillType(FillType.EVEN_ODD);
        } else {
            this.mArrow.reset();
        }
        float inset = ((float) (((int) this.mStrokeInset) / 2)) * this.mArrowScale;
        float x = (float) ((this.mRingCenterRadius * Math.cos(0.0d)) + ((double) bounds.exactCenterX()));
        float y = (float) ((this.mRingCenterRadius * Math.sin(0.0d)) + ((double) bounds.exactCenterY()));
        this.mArrow.moveTo(0.0f, 0.0f);
        this.mArrow.lineTo(((float) this.mArrowWidth) * this.mArrowScale, 0.0f);
        this.mArrow.lineTo((((float) this.mArrowWidth) * this.mArrowScale) / 2.0f, ((float) this.mArrowHeight) * this.mArrowScale);
        this.mArrow.offset(x - inset, y);
        this.mArrow.close();
        this.mArrowPaint.setColor(this.mCurrentColor);
        c.rotate((startAngle + sweepAngle) - 5.0f, bounds.exactCenterX(), bounds.exactCenterY());
        c.drawPath(this.mArrow, this.mArrowPaint);
    }
}