public moFeature Clone()
{
moGeometryTypeConstant sShapeType = _ShapeType;
moGeometry sGeometry = null;
moAttributes sAttributes = _Attributes.Clone();
if (_ShapeType == moGeometryTypeConstant.Point)
{
moPoint sPoint = (moPoint)_Geometry;
sGeometry = sPoint.Clone();
}
else if (_ShapeType == moGeometryTypeConstant.MultiPolyline)
{
moMultiPolyline sMultiPolyline = (moMultiPolyline)_Geometry;
sGeometry = sMultiPolyline.Clone();
}
else if (_ShapeType == moGeometryTypeConstant.MultiPolygon)
{
moMultiPolygon sMultiPolygon = (moMultiPolygon)_Geometry;
sGeometry = sMultiPolygon.Clone();
}
moFeature sFeature = new moFeature(sShapeType, sGeometry, sAttributes);
return(sFeature);
}
private void _AttributeFileds_FieldRemoved(object sender, int fieldIndex, moField fieldRemoved)
{
Int32 sFeatureCount = _Features.Count;
for (Int32 i = 0; i < sFeatureCount; i++)
{
moFeature sFeature = _Features.GetItem(i);
sFeature.Attributes.RemoveAt(fieldIndex);
}
}
/// <summary>
/// 绘制所有选择要素
/// </summary>
/// <param name="g"></param>
/// <param name="extent"></param>
/// <param name="mapScale"></param>
/// <param name="dpm"></param>
/// <param name="mpu"></param>
/// <param name="symbol"></param>
internal void DrawSelectedFeatures(Graphics g, moRectangle extent, double mapScale, double dpm, double mpu, moSymbol symbol)
{
//判断是否位于绘制范围内，不是，则绘制
Int32 sFeatureCount = _SelectedFeatures.Count;
for (Int32 i = 0; i < sFeatureCount; i++)
{
moFeature sFeature = _SelectedFeatures.GetItem(i);
if (IsFeatureInExtent(sFeature, extent) == true)
{
moGeometry sGeometry = sFeature.Geometry;
moMapDrawingTools.DrawGeometry(g, extent, mapScale, dpm, mpu, sGeometry, symbol);
}
}
}
private moFeature CreateNewFeature()
{
moAttributes sAttributes = new moAttributes();
Int32 sFieldCount = _AttributeFields.Count;
for (Int32 i = 0; i <= sFieldCount - 1; i++)
{
moField sField = _AttributeFields.GetItem(i);
if (sField.ValueType == moValueTypeConstant.dInt16)
{
Int16 sValue = 0;
sAttributes.Append(sValue);
}
else if (sField.ValueType == moValueTypeConstant.dInt32)
{
Int32 sValue = 0;
sAttributes.Append(sValue);
}
else if (sField.ValueType == moValueTypeConstant.dInt64)
{
Int64 sValue = 0;
sAttributes.Append(sValue);
}
else if (sField.ValueType == moValueTypeConstant.dSingle)
{
float sValue = 0;
sAttributes.Append(sValue);
}
else if (sField.ValueType == moValueTypeConstant.dDouble)
{
double sValue = 0;
sAttributes.Append(sValue);
}
else if (sField.ValueType == moValueTypeConstant.dText)
{
String sValue = "";
sAttributes.Append(sValue);
}
else
{
throw new Exception("Invalid value type!");
}
}
moFeature sFeature = new moFeature(_ShapeType, null, sAttributes);
return(sFeature);
}
/// <summary>
/// 指定要素是否位于指定范围内，这里仅计算要素的外包矩形与范围举行是否相交，判断是否需要绘制
/// </summary>
/// <param name="feature"></param>
/// <param name="extent"></param>
/// <returns></returns>
private bool IsFeatureInExtent(moFeature feature, moRectangle extent)
{
moRectangle sRect = feature.GetEnvelope();
if (sRect.MaxX < extent.MinX || sRect.MinX > extent.MaxX)
{
return(false);
}
else if (sRect.MaxY < extent.MinY || sRect.MinY > extent.MaxY)
{
return(false);
}
else
{
return(true);
}
}
/// <summary>
/// 绘制所有要素
/// </summary>
/// <param name="g">绘图对象</param>
/// <param name="extent">绘制范围（地图坐标）</param>
/// <param name="mapScale">地图比例尺的倒数</param>
/// <param name="dpm">每米对应的点数</param>
/// <param name="mpu">地图坐标单位对应的米数</param>
internal void DrawFeatures(Graphics g, moRectangle extent, double mapScale, double dpm, double mpu)
{
//（1）为所有要素配置符号
SetFeatureSymbols();
//（2）判断是否位于绘制范围内，如是，则绘制
Int32 sFeatureCount = _Features.Count;
for (Int32 i = 0; i < sFeatureCount; i++)
{
moFeature sFeature = _Features.GetItem(i);
if (IsFeatureInExtent(sFeature, extent) == true)
{
moGeometry sGeometry = sFeature.Geometry;
moSymbol sSymbol = sFeature.Symbol;
moMapDrawingTools.DrawGeometry(g, extent, mapScale, dpm, mpu, sGeometry, sSymbol);
}
}
}
private void _AttributeFileds_FieldAppended(object sender, moField fieldAppended)
{
Int32 sFeatureCount = _Features.Count;
for (Int32 i = 0; i <= sFeatureCount - 1; i++)
{
moFeature sFeature = _Features.GetItem(i);
if (fieldAppended.ValueType == moValueTypeConstant.dInt16)
{
Int16 sValue = 0;
sFeature.Attributes.Append(sValue);
}
else if (fieldAppended.ValueType == moValueTypeConstant.dInt32)
{
Int32 sValue = 0;
sFeature.Attributes.Append(sValue);
}
else if (fieldAppended.ValueType == moValueTypeConstant.dInt64)
{
Int64 sValue = 0;
sFeature.Attributes.Append(sValue);
}
else if (fieldAppended.ValueType == moValueTypeConstant.dSingle)
{
float sValue = 0;
sFeature.Attributes.Append(sValue);
}
else if (fieldAppended.ValueType == moValueTypeConstant.dDouble)
{
double sValue = 0;
sFeature.Attributes.Append(sValue);
}
else if (fieldAppended.ValueType == moValueTypeConstant.dText)
{
string sValue = string.Empty;
sFeature.Attributes.Append(sValue);
}
else
{
throw new Exception("Invalid field value type!");
}
}
}
//要素的符号是否可见
private bool IsFeatureSymbolVisible(moFeature feature)
{
moSymbol sSymbol = feature.Symbol;
if (sSymbol.SymbolType == moSymbolTypeConstant.SimpleMarkerSymbol)
{
moSimpleMarkerSymbol sMarkerSymbol = (moSimpleMarkerSymbol)sSymbol;
return(sMarkerSymbol.Visible);
}
else if (sSymbol.SymbolType == moSymbolTypeConstant.SimpleLineSymbol)
{
moSimpleLineSymbol sLineSymbol = (moSimpleLineSymbol)sSymbol;
return(sLineSymbol.Visible);
}
else if (sSymbol.SymbolType == moSymbolTypeConstant.SimpleFillSymbol)
{
moSimpleFillSymbol sFillSymbol = (moSimpleFillSymbol)sSymbol;
return(sFillSymbol.Visible);
}
else
{
throw new Exception("Invalid symbol type!");
}
}
/// <summary>
/// 删除指定元素
/// </summary>
/// <param name="feature"></param>
public void Remove(moFeature feature)
{
_Features.Remove(feature);
}
public void Add(moFeature feature)
{
_Features.Add(feature);
}
public void SetItem(Int32 index, moFeature feature)
{
_Features[index] = feature;
}
/// <summary>
/// 绘制所有注记
/// </summary>
/// <param name="g"></param>
/// <param name="extent"></param>
/// <param name="mapScale"></param>
/// <param name="dpm"></param>
/// <param name="mpu"></param>
/// <param name="placedLabelExtents"></param>
internal void DrawLabels(Graphics g, moRectangle extent, double mapScale, double dpm, double mpu, List <RectangleF> placedLabelExtents)
{
if (_LabelRenderer == null)
{
return;
}
if (_LabelRenderer.LabelFeatures == false)
{
return;
}
Int32 sFieldIndex = _AttributeFields.FindField(_LabelRenderer.Field);
if (sFieldIndex < 0)
{
return;
}
Int32 sFeatureCount = _Features.Count;
for (Int32 i = 0; i <= sFeatureCount - 1; i++)
{
moFeature sFeature = _Features.GetItem(i);
if (IsFeatureInExtent(sFeature, extent) == false)
{ //要素不位于显示范围内，不显示注记
continue;
}
if (sFeature.Symbol == null)
{ //要素没有配置符号，不显示注记
continue;
}
if (IsFeatureSymbolVisible(sFeature) == false)
{ //要素符号不可见，自然就不显示注记
continue;
}
string sLabelText = GetValueString(sFeature.Attributes.GetItem(sFieldIndex));
if (sLabelText == string.Empty)
{ //注记文本为空，不显示注记
continue;
}
//根据要素几何类型采用相应的配置方案
if (sFeature.ShapeType == moGeometryTypeConstant.Point)
{ //点要素，取点的右上为定位点，但要考虑点符号的大小
//（1）复制符号
moTextSymbol sTextSymbol; //最终绘制注记所采用的符号
sTextSymbol = _LabelRenderer.TextSymbol.Clone(); //复制符号
//（2）计算定位点并设置符号
PointF sSrcLabelPoint; //定位点的屏幕坐标
moPoint sPoint = (moPoint)sFeature.Geometry;
PointF sSrcPoint = FromMapPoint(extent, mapScale, dpm, mpu, sPoint); //点要素的屏幕坐标
moSimpleMarkerSymbol sMarkerSymbol = (moSimpleMarkerSymbol)sFeature.Symbol;
float sSymbolSize = (float)(sMarkerSymbol.Size / 1000 * dpm); //符号的屏幕尺寸
//右上方并设置符号
sSrcLabelPoint = new PointF(sSrcPoint.X + sSymbolSize / 2, sSrcPoint.Y - sSymbolSize / 2);
sTextSymbol.Alignment = moTextSymbolAlignmentConstant.BottomLeft;
//（3）计算注记的屏幕范围矩形
RectangleF sLabelExtent = GetLabelExtent(g, dpm, sSrcLabelPoint, sLabelText, sTextSymbol);
//（4）冲突检测
if (HasConflict(sLabelExtent, placedLabelExtents) == false)
{ //没有冲突，则绘制并将当前注记范围矩形加入placedLabelExtents
moMapDrawingTools.DrawLabel(g, dpm, sLabelExtent.Location, sLabelText, sTextSymbol);
placedLabelExtents.Add(sLabelExtent);
}
}
else if (sFeature.ShapeType == moGeometryTypeConstant.MultiPolyline)
{ //线要素，为每个部分的中点配置一个注记
//（1）获取符号，线要素无需复制符号
moTextSymbol sTextSymbol = _LabelRenderer.TextSymbol;
//（2）对每个部分进行配置
moMultiPolyline sMultiPolyline = (moMultiPolyline)sFeature.Geometry;
Int32 sPartCount = sMultiPolyline.Parts.Count;
for (Int32 j = 0; j <= sPartCount - 1; j++)
{
//获取注记
moPoint sMapLabelPoint = moMapTools.GetMidPointOfPolyline(sMultiPolyline.Parts.GetItem(j));
PointF sSrcLabelPoint = FromMapPoint(extent, mapScale, dpm, mpu, sMapLabelPoint);
//计算注记的屏幕范围矩形
RectangleF sLabelExtent = GetLabelExtent(g, dpm, sSrcLabelPoint, sLabelText, _LabelRenderer.TextSymbol);
//冲突检测
if (HasConflict(sLabelExtent, placedLabelExtents) == false)
{ //没有冲突，则绘制并将当前注记范围矩形加入placedLabelExtents
moMapDrawingTools.DrawLabel(g, dpm, sLabelExtent.Location, sLabelText, sTextSymbol);
placedLabelExtents.Add(sLabelExtent);
}
}
}
else if (sFeature.ShapeType == moGeometryTypeConstant.MultiPolygon)
{ //面要素，为面积最大的外环及其内环所构成的多边形配置一个注记
//（1）获取符号，面要素无需复制符号
moTextSymbol sTextSymbol = _LabelRenderer.TextSymbol;
//（2）获取注记点
moMultiPolygon sMultiPolygon = (moMultiPolygon)sFeature.Geometry;
moPoint sMapLabelPoint = moMapTools.GetLabelPointOfMultiPolygon(sMultiPolygon);
PointF sSrcLabelPoint = FromMapPoint(extent, mapScale, dpm, mpu, sMapLabelPoint);
//（3）计算注记的屏幕范围矩形
RectangleF sLabelExtent = GetLabelExtent(g, dpm, sSrcLabelPoint, sLabelText, _LabelRenderer.TextSymbol);
//（4）冲突检测
if (HasConflict(sLabelExtent, placedLabelExtents) == false)
{ //没有冲突，则绘制并将当前注记范围矩形加入placedLabelExtents
moMapDrawingTools.DrawLabel(g, dpm, sLabelExtent.Location, sLabelText, sTextSymbol);
placedLabelExtents.Add(sLabelExtent);
}
}
else
{
throw new Exception("Invalid shape type!");
}
}
}
/// <summary>
/// 新建一个要素框架
/// </summary>
/// <returns></returns>
public moFeature GetNewFeature()
{
moFeature sFeature = CreateNewFeature();
return(sFeature);
}