protected void drawHole(Canvas c) {
if (mChart.isDrawHoleEnabled()) {
float transparentCircleRadius = mChart.getTransparentCircleRadius();
float holeRadius = mChart.getHoleRadius();
float radius = mChart.getRadius();
PointF center = mChart.getCenterCircleBox();
// only draw the circle if it can be seen (not covered by the hole)
if (transparentCircleRadius > holeRadius) {
// get original alpha
int alpha = mTransparentCirclePaint.getAlpha();
mTransparentCirclePaint.setAlpha(
(int) ((float) alpha * mAnimator.getPhaseX() * mAnimator.getPhaseY()));
// draw the transparent-circle
mBitmapCanvas.drawCircle(
center.x, center.y, radius / 100 * transparentCircleRadius, mTransparentCirclePaint);
// reset alpha
mTransparentCirclePaint.setAlpha(alpha);
}
// draw the hole-circle
mBitmapCanvas.drawCircle(center.x, center.y, radius / 100 * holeRadius, mHolePaint);
}
}
