/**
* Returns a two-element array containing this raster's extreme scalar values, ignoring any values marked as
* missing-data. This returns null if this raster contains no values, or if it contains only values marked as
* missing-data.
*
* @return a two-element array containing this raster's extreme values, or null if none exist. Entry 0 contains the
* minimum value; entry 1 contains the maximum value.
*/
public double[] getExtremes()
{
// Create local variables to store the raster's dimensions and missing data signal to eliminate any overhead in
// the loops below.
int width = this.getWidth();
int height = this.getHeight();
double missingDataSignal = this.getTransparentValue();
// Allocate a buffer to hold one row of scalar values.
double[] buffer = new double[width];
// Allocate a buffer to hold the extreme values.
double[] extremes = null;
for (int j = 0; j < height; j++)
{
this.get(0, j, width, buffer, 0); // Get the row starting at (0, j).
for (int i = 0; i < width; i++)
{
if (buffer[i] == missingDataSignal) // Ignore values marked as missing-data.
{
continue;
}
if (extremes == null)
{
extremes = WWUtil.defaultMinMix();
}
if (extremes[0] > buffer[i])
{
extremes[0] = buffer[i];
}
if (extremes[1] < buffer[i])
{
extremes[1] = buffer[i];
}
}
}
// Extremes is null if this raster is empty, or contains only values marked as missing-data.
return(extremes);
}