public void GetSubPageHeightBounds(int xOff, int zOff, int xSize, int zSize, out float minHeight, out float maxHeight)
{
// convert coords/sizes to number of subpages
xOff = xOff / subPageSize;
zOff = zOff / subPageSize;
xSize = xSize / subPageSize;
zSize = zSize / subPageSize;
minHeight = float.MaxValue;
maxHeight = float.MinValue;
for (int z = zOff; z < (zOff + zSize); z++)
{
for (int x = xOff; x < (xOff + xSize); x++)
{
SubPageHeightMap subPage = subPages[x + z * subPagesPerPage];
if (subPage.MaxHeight > maxHeight)
{
maxHeight = subPage.MaxHeight;
}
if (subPage.MinHeight < minHeight)
{
minHeight = subPage.MinHeight;
}
}
}
}
/// <summary>
/// Get the height of the sample at the given coordinates within the page.
/// Coordinates are in meters, and are relative to the page.
/// </summary>
/// <param name="x"></param>
/// <param name="z"></param>
/// <returns></returns>
public float GetHeight(int x, int z)
{
int subPageMask = subPageSize - 1;
// figure X and Z offsets of the subpage that contains the given point
int subPageX = x / subPageSize;
int subPageZ = z / subPageSize;
SubPageHeightMap subPage = subPages[subPageX + subPageZ * subPagesPerPage];
return(subPage.GetHeight(x & subPageMask, z & subPageMask));
}
public PageHeightMap(int subPagesPerPage, int pageSize, int maxMetersPerSample, int minMetersPerSample)
{
this.subPagesPerPage = subPagesPerPage;
this.pageSize = pageSize;
subPageSize = pageSize / subPagesPerPage;
// allocate the array to hold the subpages
subPages = new SubPageHeightMap[subPagesPerPage * subPagesPerPage];
// allocate all the subpages
for (int z = 0; z < subPagesPerPage; z++)
{
for (int x = 0; x < subPagesPerPage; x++)
{
subPages[x + z * subPagesPerPage] = new SubPageHeightMap(pageSize / subPagesPerPage, maxMetersPerSample, minMetersPerSample, x, z);
}
}
}