public StdDevStretch(int actualMin, int actualMax, QuantizedStatistics stats, float numDeviationsFromMean)
: base(actualMin, actualMax)
{
if (stats == null)
throw new ArgumentNullException("stats", "StdDevStretch requires statistics.");
m_stats = stats;
m_deviations = numDeviationsFromMean;
var totalDeviationFromMean = (long)(m_deviations * m_stats.StdDev);
m_stretchMin = (int)Math.Max(ActualMin, stats.m_mean - totalDeviationFromMean);
m_stretchMax = (int)Math.Min(ActualMax, stats.m_mean + totalDeviationFromMean);
}
public StdDevStretch(int actualMin, int actualMax, QuantizedStatistics stats, float numDeviationsFromMean) :
base(actualMin, actualMax)
{
if (stats == null)
{
throw new ArgumentNullException("stats", "StdDevStretch requires statistics.");
}
m_stats = stats;
m_deviations = numDeviationsFromMean;
var totalDeviationFromMean = (long)(m_deviations * m_stats.StdDev);
m_stretchMin = (int)Math.Max(ActualMin, stats.m_mean - totalDeviationFromMean);
m_stretchMax = (int)Math.Min(ActualMax, stats.m_mean + totalDeviationFromMean);
}
public PointCloudTileSource(LASFile file, PointCloudTileSet tileSet, Statistics zStats)
: base(file, tileSet.PointCount, tileSet.Extent, file.Header.Quantization, file.Header.OffsetToPointData, (short)file.Header.PointDataRecordLength)
{
m_file = file;
m_id = IdentityManager.AcquireIdentity(GetType().Name);
m_tileSet = tileSet;
m_tileSet.TileSource = this;
m_statisticsZ = zStats;
m_statisticsQuantizedZ = zStats.ConvertToQuantized(Quantization);
m_lowResBuffer = BufferManager.AcquireBuffer(m_id, tileSet.LowResCount * PointSizeBytes);
m_file.UpdateEVLR(new LASRecordIdentifier("Jacere", 0), TileSet);
m_file.UpdateEVLR(new LASRecordIdentifier("Jacere", 1), StatisticsZ);
}
private static unsafe BitmapSource CreateBitmapSource(Grid<int> grid, SQuantizedExtent3D extent, QuantizedStatistics statistics, bool useStdDevStretch, IColorHandler colorHandler, int quality)
{
var ramp = colorHandler as ColorRamp;
var map = colorHandler as ColorMapDistinct;
var bmp = new WriteableBitmap(grid.SizeX, grid.SizeY, 96, 96, System.Windows.Media.PixelFormats.Bgra32, null);
bmp.Lock();
var pBackBuffer = bmp.BackBuffer;
var p = (int*)pBackBuffer;
if (map != null)
{
//CreateColorBufferMap(grid, p, map);
}
else
{
if (ramp == null)
ramp = ColorRamp.PredefinedColorRamps.Grayscale;
var qualityRatio = (float)quality / 100;
var rampSize = (int)(qualityRatio * 300);
StretchBase stretch = null;
if(useStdDevStretch)
stretch = new StdDevStretch(extent.MinZ, extent.MaxZ, statistics, 2);
else
stretch = new MinMaxStretch(extent.MinZ, extent.MaxZ);
var cachedRamp = ramp.CreateCachedRamp(stretch, rampSize);
//var sw = Stopwatch.StartNew();
//int count = 300;
//for (int i = 0; i < count; i++)
{
CreateColorBufferMap(grid, p, cachedRamp);
}
//sw.Stop();
//Context.WriteLine("fps: {0}", (double)1000 * count / sw.ElapsedMilliseconds);
}
bmp.AddDirtyRect(new System.Windows.Int32Rect(0, 0, bmp.PixelWidth, bmp.PixelHeight));
bmp.Unlock();
bmp.Freeze();
return bmp;
}
