private int GetMaxBandCount()
{
int maxCount = 0;
IRaster2 raster2 = m_rstlayer.Raster as IRaster2;
IRasterDataset rstDataset = raster2.RasterDataset;
IRasterBandCollection rstBandCollection = rstDataset as IRasterBandCollection;
int[] max = new int[m_selband.Length];
for (int i = 0; i < m_selband.Length; i++)
{
IRasterBand rstBand = rstBandCollection.Item(m_selband[i]);
bool hasStat = false;
rstBand.HasStatistics(out hasStat);
if (null == rstBand.Statistics || !hasStat || null == rstBand.Histogram)
{
//转换Irasterbandedit2接口，调用computestshistogram方法用于波段信息统计以及直方图绘制
IRasterBandEdit2 rstBandEdit = rstBand as IRasterBandEdit2;
rstBandEdit.ComputeStatsHistogram(0);
}
//获取每个像元值的统计个数
double[] pixelCounts = rstBand.Histogram.Counts as double[];
max[i] = (int)pixelCounts[0];
for (int j = 0; j < pixelCounts.Length; j++)
{
if (max[i] < pixelCounts[j])
{
max[i] = (int)pixelCounts[j];
}
}
maxCount = max[0];
for (int j = 0; j < m_selband.Length; j++)
{
if (maxCount < max[j])
{
maxCount = max[j];
}
}
}
return(maxCount);
}
private void DrawHisto(int index, int maxst, Graphics g)
{
Pen pen = new Pen(Brushes.Black, 1);
Color color = Color.Black;
switch (index)
{
case 0:
color = Color.Red;
break;
case 1:
color = Color.Orange;
break;
case 2:
color = Color.Yellow;
break;
case 3:
color = Color.Green;
break;
case 4:
color = Color.Blue;
break;
case 5:
color = Color.Purple;
break;
case 6:
color = Color.Peru;
break;
}
pen.Color = color;
IRaster2 raster2 = m_rstlayer.Raster as IRaster2;
IRasterDataset rstDataset = raster2.RasterDataset;
IRasterBandCollection rstBandCollection = rstDataset as IRasterBandCollection;
IRasterBand rstBand = rstBandCollection.Item(index);
bool hasStat = false;
rstBand.HasStatistics(out hasStat);
if (null == rstBand.Statistics || !hasStat || null == rstBand.Histogram)
{
//转换Irasterbandedit2接口，调用computestshistogram方法用于波段信息统计以及直方图绘制
IRasterBandEdit2 rstBandEdit = rstBand as IRasterBandEdit2;
rstBandEdit.ComputeStatsHistogram(0);
}
//获取每个像元值的统计个数
double[] pixelCounts = rstBand.Histogram.Counts as double[];
double xTemp = 0;
double yTemp = 0;
for (int i = 0; i < pixelCounts.Length; i++)
{
xTemp = i * 1.0 / pixelCounts.Length * (300 - 50);
yTemp = 200.0 * pixelCounts[i] / maxst;
g.DrawLine(pen, 50 + (int)xTemp, 240, 50 + (int)xTemp, 240 - (int)yTemp);
}
pen.Dispose();
}