public void CreateLegend()
{
Legend aLegend = new Legend();
PointD aPoint = new PointD();
double width = _maxX - _minX;
aPoint.X = _minX + width / 4;
aPoint.Y = _minY + width / 100;
Legend.legendPara lPara = new Legend.legendPara();
lPara.startPoint = aPoint;
lPara.isTriangle = true;
lPara.isVertical = false;
lPara.length = width / 2;
lPara.width = width / 100;
lPara.contourValues = _CValues;
_legendPolygons = Legend.CreateLegend(lPara);
}