//绘制Polygon要素
private void DrawPolygon(Graphics g, Geometry geom, int index)
{
if (geom != null)
{
//提取坐标信息
string GeomWkt;
geom.ExportToWkt(out GeomWkt);
string[] str = GeomWkt.Split(new char[4] {
' ', '(', ')', ','
});
List <PointF> ScreenPoints = new List <PointF>();
for (int k = 3; k < str.Count() - 3; k += 2)
{
PointF point = new PointF(Convert.ToSingle(str[k]), Convert.ToSingle(str[k + 1]));
PointF screenPoint = FromMapPoint(point);
if ((int)screenPoint.X == -2147483648)
{
return;
}
ScreenPoints.Add(screenPoint);
}
if (MapLayers[index].Style.Styles.Count == 0)
{
//绘制
g.FillPolygon(new SolidBrush(Color.Orange), ScreenPoints.ToArray());
g.DrawPolygon(new Pen(Color.Black), ScreenPoints.ToArray());
}
else // 按Style绘制
{
// 遍历规则
List <LayerStyle.FeatureTypeStyle.Rule> Rules = MapLayers[index].Style.Styles[0].Rules;
for (int i = 0; i < Rules.Count; ++i)
{
if (Rules[i].PolygonSymbol.Stroke.Enabled)
{
SolidBrush brush;
Pen pen;
if (Rules[i].PolygonSymbol.Fill.Enabled)
{
brush = new SolidBrush(Color.FromArgb(Convert.ToInt32(255 * Rules[i].PolygonSymbol.Fill.Opacity),
ColorTranslator.FromHtml(Rules[i].PolygonSymbol.Fill.Color)));
g.FillPolygon(brush, ScreenPoints.ToArray());
}
pen = new Pen(Color.FromArgb(Convert.ToInt32(255 * Rules[i].PolygonSymbol.Stroke.Opacity),
ColorTranslator.FromHtml(Rules[i].PolygonSymbol.Stroke.Color)), (float)Rules[i].PolygonSymbol.Stroke.Width);
g.DrawPolygon(pen, ScreenPoints.ToArray());
}
}
}
}
}
//绘制Point要素
private void DrawPoint(Graphics g, Geometry geom, int index, int fid)
{
if (geom != null)
{
//提取坐标信息
string GeomWkt;
geom.ExportToWkt(out GeomWkt);
string[] str = GeomWkt.Split(new char[3] {
' ', '(', ')'
});
PointF point = new PointF();
point.X = Convert.ToSingle(str[2]);
point.Y = Convert.ToSingle(str[3]);
//计算屏幕坐标
PointF ScreenPoint = FromMapPoint(point);
if ((int)ScreenPoint.X == -2147483648)
{
return;
}
if (MapLayers[index].Style.Styles.Count == 0)
{
g.FillEllipse(new SolidBrush(Color.Blue), new RectangleF((float)(ScreenPoint.X - 2), (float)(ScreenPoint.Y - 2), 4, 4));
}
else
{
SolidBrush brush;
RectangleF rect;
Pen pen;
// 按照Style绘制
// 遍历规则
List <LayerStyle.FeatureTypeStyle.Rule> Rules = MapLayers[index].Style.Styles[0].Rules;
for (int i = 0; i < Rules.Count; ++i)
{
if (Rules[i].FiltersAnd.Count != 0)
{
bool RuleEnabled = true;
// 判断条件
for (int j = 0; j < Rules[i].FiltersAnd.Count; ++j)
{
string filter = "FID = " + Convert.ToString(fid);
double value = Convert.ToDouble(MapLayers[index].DT.Rows[fid][
Rules[i].FiltersAnd[j].PropertyName]);
if (Rules[i].FiltersAnd[j].Criterion == "ge")
{
if (value < Rules[i].FiltersAnd[j].Literal)
{
RuleEnabled = false;
break;
}
}
else if (Rules[i].FiltersAnd[j].Criterion == "le")
{
if (value > Rules[i].FiltersAnd[j].Literal)
{
RuleEnabled = false;
break;
}
}
}
if (RuleEnabled)
{
// 画点
if (Rules[i].PointSymbol.Fill.Enabled)
{
brush = new SolidBrush(Color.FromArgb(Convert.ToInt32(255 * Rules[i].PointSymbol.Fill.Opacity),
ColorTranslator.FromHtml(Rules[i].PointSymbol.Fill.Color)));
string sizestr = Convert.ToString(MapLayers[index].DT.Rows[fid][
Rules[i].PointSymbol.SizePropertyName]);
if (sizestr == "Infinity")
{
sizestr = "100";
}
float size = Convert.ToSingle(sizestr);
rect = new RectangleF((float)(ScreenPoint.X - size * 0.5), (float)(ScreenPoint.Y - size * 0.5), size, size);
g.FillEllipse(brush, rect);
if (Rules[i].PointSymbol.Stroke.Enabled)
{
pen = new Pen(Color.FromArgb(Convert.ToInt32(255 * Rules[i].PointSymbol.Stroke.Opacity),
ColorTranslator.FromHtml(Rules[i].PointSymbol.Stroke.Color)), (float)Rules[i].PointSymbol.Stroke.Width);
g.DrawEllipse(pen, rect);
}
}
}
}
if (Rules[i].FiltersOr.Count != 0)
{
// 示例数据里没有
}
}
}
}
}