/// <summary>
/// Copy pixels in from a source image, rescaling the values to map into a new value range.
/// </summary>
/// <param name="src"></param>
/// <param name="sx"></param>
/// <param name="sz"></param>
/// <param name="srcMinHeight"></param>
/// <param name="srcMaxHeight"></param>
/// <param name="size"></param>
/// <param name="destMinHeight"></param>
/// <param name="destMaxHeight"></param>
protected virtual void CopyFromImageRescale(Image src, int sx, int sz, float srcMinHeight, float srcMaxHeight, int size, float destMinHeight, float destMaxHeight)
{
// copy source sub-image to destination
double sourceHeightRange = srcMaxHeight - srcMinHeight;
double destHeightRange = destMaxHeight - destMinHeight;
// Convert height range to inverse so that we can use multiplication rather than
// division in the inner loop.
double invHeightRange = 1.0 / destHeightRange;
// loop over all pixels, converting to the world's height range while
// copying.
for (int z = 0; z < size; z++)
{
for (int x = 0; x < size; x++)
{
double raw = src.GetNormPixel(x + sx, z + sz);
double scaledSourceValue = raw * sourceHeightRange + srcMinHeight;
double destNorm = (scaledSourceValue - destMinHeight) * invHeightRange;
if (destNorm > 1.0)
{
destNorm = 1.0;
}
if (destNorm < 0.0)
{
destNorm = 0.0;
}
SetValue(x, z, (uint)(destNorm * MaxSampleValue));
}
}
dirty = true;
}
/// <summary>
/// Copy pixels in from a source image, rescaling the values to map into a new value range.
/// </summary>
/// <param name="src"></param>
/// <param name="sx"></param>
/// <param name="sz"></param>
/// <param name="srcMinHeight"></param>
/// <param name="srcMaxHeight"></param>
/// <param name="size"></param>
/// <param name="destMinHeight"></param>
/// <param name="destMaxHeight"></param>
protected virtual void CopyFromImageRescale(Image src, int sx, int sz, float srcMinHeight, float srcMaxHeight, int size, float destMinHeight, float destMaxHeight)
{
// copy source sub-image to destination
double sourceHeightRange = srcMaxHeight - srcMinHeight;
double destHeightRange = destMaxHeight - destMinHeight;
// Convert height range to inverse so that we can use multiplication rather than
// division in the inner loop.
double invHeightRange = 1.0 / destHeightRange;
// loop over all pixels, converting to the world's height range while
// copying.
for (int z = 0; z < size; z++)
{
for (int x = 0; x < size; x++)
{
double raw = src.GetNormPixel(x + sx, z + sz);
double scaledSourceValue = raw * sourceHeightRange + srcMinHeight;
double destNorm = (scaledSourceValue - destMinHeight) * invHeightRange;
if (destNorm > 1.0)
{
destNorm = 1.0;
}
if (destNorm < 0.0)
{
destNorm = 0.0;
}
SetValue(x, z, (uint)(destNorm * MaxSampleValue));
}
}
dirty = true;
}