@Override
protected void computeAxisValues(float min, float max) {
float yMin = min;
float yMax = max;
int labelCount = mYAxis.getLabelCount();
double range = Math.abs(yMax - yMin);
if (labelCount == 0 || range <= 0) {
mYAxis.mEntries = new float[] {};
mYAxis.mEntryCount = 0;
return;
}
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);
}
// force label count
if (mYAxis.isForceLabelsEnabled()) {
float step = (float) range / (float) (labelCount - 1);
mYAxis.mEntryCount = labelCount;
if (mYAxis.mEntries.length < labelCount) {
// Ensure stops contains at least numStops elements.
mYAxis.mEntries = new float[labelCount];
}
float v = min;
for (int i = 0; i < labelCount; i++) {
mYAxis.mEntries[i] = v;
v += step;
}
// no forced count
} else {
// if the labels should only show min and max
if (mYAxis.isShowOnlyMinMaxEnabled()) {
mYAxis.mEntryCount = 2;
mYAxis.mEntries = new float[2];
mYAxis.mEntries[0] = yMin;
mYAxis.mEntries[1] = yMax;
} else {
final double rawCount = yMin / interval;
double first =
rawCount < 0.0 ? Math.floor(rawCount) * interval : Math.ceil(rawCount) * interval;
if (first < yMin && mYAxis.isStartAtZeroEnabled()) {
// Force the first label to be at the 0 (or smallest negative value)
first = yMin;
}
if (first == 0.0) // Fix for IEEE negative zero case (Where value == -0.0, and 0.0 == -0.0)
first = 0.0;
double last = Utils.nextUp(Math.floor(yMax / interval) * interval);
double f;
int i;
int n = 0;
for (f = first; f <= last; f += interval) {
++n;
}
if (Float.isNaN(mYAxis.getAxisMaxValue())) n += 1;
mYAxis.mEntryCount = n;
if (mYAxis.mEntries.length < n) {
// Ensure stops contains at least numStops elements.
mYAxis.mEntries = new float[n];
}
for (f = first, i = 0; i < n; f += interval, ++i) {
mYAxis.mEntries[i] = (float) f;
}
}
}
if (interval < 1) {
mYAxis.mDecimals = (int) Math.ceil(-Math.log10(interval));
} else {
mYAxis.mDecimals = 0;
}
if (!mYAxis.isStartAtZeroEnabled() && mYAxis.mEntries[0] < yMin) {
// If startAtZero is disabled, and the first label is lower that the axis minimum,
// Then adjust the axis minimum
mYAxis.mAxisMinimum = mYAxis.mEntries[0];
}
mYAxis.mAxisMaximum = mYAxis.mEntries[mYAxis.mEntryCount - 1];
mYAxis.mAxisRange = Math.abs(mYAxis.mAxisMaximum - mYAxis.mAxisMinimum);
}
