private void BtchangeEsymbol_Click(object sender, EventArgs e)
{
int symbolsize = Convert.ToInt32(tbsymbolsize.Text);
int cls = Convert.ToInt32(tbclass.Text);
Color symbolcolor = btsymbolfillcolor.BackColor;
List <int> sizes = layer.getSymbolSize(cbattributeEsymbol.SelectedIndex, symbolsize, cls);
//新建一个esymbollayer，在点密度中的点将以一个点图层的形式显示出来
GISLayer esymbollayer = new GISLayer("Esymbol", SHAPETYPE.point, layer.Extent);
esymbollayer.Selectable = false; //设置为不可选择
esymbollayer.ThematicType = THEMATICTYPE.EqualSymbol; //设置为等比变换型专题地图
//为esymbollayer中每一个对象设置一个thematic
for (int i = 0; i < layer.Features.Count; i++)
{
esymbollayer.Thematics.Add(i, new GISThematic(Color.Black, sizes[i], symbolcolor));
Console.WriteLine(sizes[i]);
}
//创建symbols点对象，作为esymbollayer的features
//默认将符号放于polygon的重心位置
List <GISFeature> symbols = new List <GISFeature>();
for (int i = 0; i < layer.Features.Count; i++)
{
GISPolygon polygon = (GISPolygon)layer.Features[i].spatialpart;
GISVertex vertex = new GISVertex(polygon.centroid);
symbols.Add(new GISFeature(new GISPoint(vertex), null));
}
esymbollayer.Features = symbols;
//先移除之前已有的点密度图层
for (int i = Document.layers.Count - 1; i > 0; i--)
{
if (Document.layers[i].Name == "Esymbol")
{
Document.layers.RemoveAt(i);
}
}
Document.layers.Add(esymbollayer);//将esymbollayer添加到document中 在更新地图绘制时会自动绘制layers里面的所有图层
//更新地图绘制
if (sender.Equals(previewes))
{
PreviewWindow.UpdateMap();
}
else if (sender.Equals(btchangeEsymbol))
{
Mapwindow.UpdateMap();
}
}
//输出图层所有GISFeatrue
static void WriteFeatures(GISLayer layer, BinaryWriter bw)
{
for (int featureindex = 0; featureindex < layer.FeatureCount(); featureindex++)
{
GISFeature feature = layer.GetFeature(featureindex);
if (layer.ShapeType == SHAPETYPE.point)
{
((GISPoint)feature.spatialpart).centroid.WriteVertex(bw);
}
else if (layer.ShapeType == SHAPETYPE.line)
{
GISLine line = (GISLine)(feature.spatialpart);
WriteMultipleVertexes(line.Vertexes, bw);
}
else if (layer.ShapeType == SHAPETYPE.polygon)
{
GISPolygon polygon = (GISPolygon)(feature.spatialpart);
WriteMultipleVertexes(polygon.Vertexes, bw);
}
WriteAttributes(feature.attributepart, bw);
}
}
