protected override void HandleHistogram(double[] buffer, RasterQuickStatResult result, int cols)
{
int idx = 0;
double std = 0;
HistogramResult histogram = result.HistogramResult;
double minValue = result.MinValue;
double maxValue = result.MaxValue;
double bin = histogram.Bin;
double stddevValue = result.Stddev;
double meanValue = result.MeanValue;
int itemCount = histogram.Items.Length;
if (bin != 0d)
{
for (int i = 0; i < cols; i++)
{
idx = (int)((buffer[i] - minValue) / bin);
if (idx < 0 || idx > itemCount)
{
continue;
}
histogram.Items[idx]++;
std = buffer[i] - meanValue;
stddevValue += (std * std);
}
result.Stddev = stddevValue;
}
else
{
histogram.Items[0] = cols;
}
}
private void PrintHistogram(int bandNo, RasterQuickStatResult result)
{
StringBuilder sb = new StringBuilder();
sb.AppendLine(" -".PadRight(76, '-'));
sb.AppendLine(" 波段 " + bandNo.ToString() + " 直方图:");
sb.AppendLine("间隔:".PadLeft(12) + result.HistogramResult.Bin.ToString("0.######"));
HistogramResult histResult = result.HistogramResult;
int buckets = histResult.ActualBuckets;
sb.AppendLine("计数值".PadLeft(12) + "像元个数".PadLeft(11) + "累计像元个数".PadLeft(9) + "百分比".PadLeft(12) + "累计百分比".PadLeft(10));
double minValue = result.MinValue;
double bin = histResult.Bin;
long accCount = 0;
double percent = 0;
double accPercent = 0;
if (bin != 0)
{
for (int i = 0; i < buckets; i++)
{
accCount += histResult.Items[i];
percent = 100 * histResult.Items[i] / (float)histResult.PixelCount;
accPercent += percent;
string sLine = (minValue + i * bin).ToString("0.######").PadLeft(15) +
histResult.Items[i].ToString().PadLeft(15) +
accCount.ToString().PadLeft(15) +
percent.ToString("0.####").PadLeft(15) +
accPercent.ToString("0.####").PadLeft(15);
sb.AppendLine(sLine);
}
}
else
{
accCount += histResult.Items[0];
percent = 100 * histResult.Items[0] / (float)histResult.PixelCount;
accPercent += percent;
string sLine = minValue.ToString("0.######").PadLeft(15) +
histResult.Items[0].ToString().PadLeft(15) +
accCount.ToString().PadLeft(15) +
percent.ToString("0.####").PadLeft(15) +
accPercent.ToString("0.####").PadLeft(15);
sb.AppendLine(sLine);
}
richTextBox1.Text += sb.ToString();
}
public void Apply(string fileName, Dictionary <int, RasterQuickStatResult> results)
{
_curvePens = new Dictionary <int, Pen>();
_legendBurshes = new Dictionary <int, Brush>();
_fileName = fileName;
_results = results;
_minValue = double.MaxValue;
_maxValue = double.MinValue;
double minCount1, maxCount1;
_minCount = double.MaxValue;
_maxCount = double.MinValue;
foreach (int bandNo in results.Keys)
{
RasterQuickStatResult restul = results[bandNo];
if (restul.MinValue < _minValue)
{
_minValue = restul.MinValue;
}
if (restul.MaxValue > _maxValue)
{
_maxValue = restul.MaxValue;
}
HistogramResult histResult = restul.HistogramResult;
minCount1 = histResult.Items.Min();
maxCount1 = histResult.Items.Max();
if (minCount1 < _minCount)
{
_minCount = minCount1;
}
if (maxCount1 > _maxCount)
{
_maxCount = maxCount1;
}
//
_curvePens.Add(bandNo, new Pen(GetRandomColor()));
_legendBurshes.Add(bandNo, new SolidBrush(_curvePens[bandNo].Color));
}
//
ChangeBand(-1);
}
void UCHistogramGrapCanvas_Paint(object sender, PaintEventArgs e)
{
e.Graphics.Clear(_fillColor);
//
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
//
SizeF fontSize = e.Graphics.MeasureString(_maxCount.ToString(), Font);
int nCountChars = _maxCount.ToString().Length;
_marginLeft = (int)Math.Ceiling(fontSize.Width) + 2;
//draw fileName
e.Graphics.DrawString("文件 : " + _fileName, Font, _axisBrush, new PointF(_marginLeft + 2, 4));
//draw axises
e.Graphics.DrawRectangle(_axisPen, _marginLeft, _marginTop, this.Width - _marginLeft - _marginRight, this.Height - _marginTop - _marginBottom);
//draw v axis
double diffValue = (MaxCount - _minCount) / (float)_vScaleCount;//直方图坐标轴频率分段间隔
double v;
float y = Height - _marginBottom;
float y1;
float dltY = fontSize.Height / 2f;
float ySpan = (Height - _marginTop - _marginBottom) / (float)_vScaleCount; //隔ySpan绘制频率值
float y1Span = ySpan / _minorScaleCount; //隔y1Span绘制格线
float x = 0;
for (int i = 0; i <= _vScaleCount; i++)
{
v = (int)(_minCount + diffValue * i);
e.Graphics.DrawString(v.ToString().PadLeft(nCountChars), Font, _axisBrush, new PointF(x, y - dltY));
e.Graphics.DrawLine(_axisPen, _marginLeft, y, _marginLeft + _maxScaleLen, y);
if (i == _vScaleCount)
{
break;
}
y1 = y;
for (int j = 0; j < _minorScaleCount; j++)
{
e.Graphics.DrawLine(_axisPen, _marginLeft, y1, _marginLeft + _minScaleLen, y1);
y1 -= y1Span;
}
y -= ySpan;
}
//draw h axis
diffValue = (MaxValue - MinValue) / (float)_hScaleCount;
x = _marginLeft;
float x1 = x;
y = Height - _marginBottom;
float xSpan = (Width - _marginLeft - _marginRight) / (float)_hScaleCount;
float x1Span = xSpan / _minorScaleCount;
string vString;
for (int i = 0; i <= _hScaleCount; i++)
{
v = (_minValue + diffValue * i);
vString = v.ToString("0.####");
e.Graphics.DrawLine(_axisPen, x, y, x, y - _maxScaleLen);
fontSize = e.Graphics.MeasureString(vString, Font);
e.Graphics.DrawString(vString, Font, _axisBrush, x - fontSize.Width / 2f, y + 2);
if (i == _hScaleCount)
{
break;
}
x1 = x;
for (int j = 0; j < _minorScaleCount; j++)
{
e.Graphics.DrawLine(_axisPen, x1, y, x1, y - _minScaleLen);
x1 += x1Span;
}
x += xSpan;
}
//draw curve，绘制曲线
if (_selectedBandNos == null || _selectedBandNos.Length == 0)
{
return;
}
double bValue;
diffValue = (MaxValue - MinValue) / (Width - _marginLeft - _marginRight); //直方图水平方向的分辨率倒数（间隔多点一个单位）
double diffCount = (MaxCount - MinCount) / (Height - _marginTop - _marginBottom); //直方图垂直方向的分辨率倒数
if (diffValue == 0d || diffCount == 0d)
{
}
else
{
foreach (int bandNo in _selectedBandNos)
{
RasterQuickStatResult result = _results[bandNo];
HistogramResult hist = result.HistogramResult;
int vCount = hist.ActualBuckets;
//zyb，20131119新加
if (vCount <= 1)
{
continue;
}
PointF[] pts = new PointF[vCount];
for (int i = 0; i < vCount; i++)
{
bValue = _minValue + i * hist.Bin;
x = (float)(_marginLeft + (bValue - _minValue) / diffValue);
y = (float)(Height - _marginBottom - hist.Items[i] / diffCount);
pts[i] = new PointF(x, y);
}
e.Graphics.DrawCurve(_curvePens[bandNo], pts, 0f);
}
}
//draw lengends,绘制图例
x = Width - _marginRight + 20;
y = _marginTop;
foreach (int bandNo in _selectedBandNos)
{
e.Graphics.FillRectangle(_legendBurshes[bandNo], x, y, _LegendWidth, _LegendWidth);
e.Graphics.DrawString("Band " + bandNo.ToString(), Font, _legendBurshes[bandNo], x + _LegendWidth + 2, y);
y += (fontSize.Height + 4);
}
}
