/**
* Calculates the required maximum y-value in order to be able to provide the desired number of
* label entries and rounded label values.
*/
private void prepareYLabels() {
int labelCount = mYLabels.getLabelCount();
double range = mCurrentData.getYMax() - mYChartMin;
double rawInterval = range / labelCount;
double interval = Utils.roundToNextSignificant(rawInterval);
double intervalMagnitude = Math.pow(10, (int) Math.log10(interval));
int intervalSigDigit = (int) (interval / intervalMagnitude);
if (intervalSigDigit > 5) {
// Use one order of magnitude higher, to avoid intervals like 0.9 or
// 90
interval = Math.floor(10 * intervalMagnitude);
}
double first = Math.ceil(mYChartMin / interval) * interval;
double last = Utils.nextUp(Math.floor(mCurrentData.getYMax() / interval) * interval);
double f;
int n = 0;
for (f = first; f <= last; f += interval) {
++n;
}
mYLabels.mEntryCount = n;
mYChartMax = (float) interval * n;
// calc delta
mDeltaY = Math.abs(mYChartMax - mYChartMin);
}
