/// <summary>
/// 复制
/// </summary>
/// <returns></returns>
public moTextSymbol Clone()
{
moTextSymbol sTextSymbol = new moTextSymbol();
sTextSymbol._Font = (Font)_Font.Clone();
sTextSymbol._FontColor = _FontColor;
sTextSymbol._Alignment = _Alignment;
sTextSymbol._OffsetX = _OffsetX;
sTextSymbol._OffsetY = _OffsetY;
sTextSymbol._UseMask = _UseMask;
sTextSymbol._MaskColor = _MaskColor;
sTextSymbol._MaskWidth = _MaskWidth;
return(sTextSymbol);
}
//绘制注记
internal static void DrawLabel(Graphics g, double dpm, PointF OriPoint, string labelText, moTextSymbol textSymbol)
{
SmoothingMode sSmoothMode = g.SmoothingMode;
g.SmoothingMode = SmoothingMode.HighQuality;
//说明，OriPoint：绘制原点（即注记左上点）
SolidBrush sTextBrush = new SolidBrush(textSymbol.FontColor);
Pen sMaskPen = new Pen(textSymbol.MaskColor, (float)(2 * textSymbol.MaskWidth * dpm / 1000));
float dpi = (float)(dpm * 0.0254);
if (textSymbol.UseMask == true)
{ //需要描边
GraphicsPath sGraphicPath = new GraphicsPath();
sGraphicPath.AddString(labelText, textSymbol.Font.FontFamily, (Int32)textSymbol.Font.Style, textSymbol.Font.Size * dpi / 72, OriPoint, StringFormat.GenericDefault);
g.DrawPath(sMaskPen, sGraphicPath);
g.FillPath(sTextBrush, sGraphicPath);
sGraphicPath.Dispose();
}
else
{ //不需要描边
g.DrawString(labelText, textSymbol.Font, sTextBrush, OriPoint);
}
sTextBrush.Dispose();
sMaskPen.Dispose();
g.SmoothingMode = sSmoothMode;
}
//获取注记的屏幕范围
private RectangleF GetLabelExtent(Graphics g, double dpm, PointF labelPoint, string labelText, moTextSymbol textSymbol)
{
//（1）测量注记大小
SizeF sLabelSize = g.MeasureString(labelText, textSymbol.Font); //注记的尺寸
//（2）计算偏移量
float sLabelOffsetX, sLabelOffsetY; //注记偏移量（屏幕坐标），向右、向上位正
sLabelOffsetX = (float)(textSymbol.OffsetX / 1000 * dpm);
sLabelOffsetY = (float)(textSymbol.OffsetY / 1000 * dpm);
//（3）根据布局计算左上点
PointF sTopLeftPoint = new PointF(); //注记左上点坐标（屏幕坐标）
if (textSymbol.Alignment == moTextSymbolAlignmentConstant.TopLeft)
{
sTopLeftPoint.X = labelPoint.X + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.TopCenter)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width / 2 + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.TopRight)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.CenterLeft)
{
sTopLeftPoint.X = labelPoint.X + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height / 2 - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.CenterCenter)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width / 2 + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height / 2 - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.CenterRight)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height / 2 - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.BottomLeft)
{
sTopLeftPoint.X = labelPoint.X + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.BottomCenter)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width / 2 + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height - sLabelOffsetY;
}
else if (textSymbol.Alignment == moTextSymbolAlignmentConstant.BottomRight)
{
sTopLeftPoint.X = labelPoint.X - sLabelSize.Width + sLabelOffsetX;
sTopLeftPoint.Y = labelPoint.Y - sLabelSize.Height - sLabelOffsetY;
}
else
{
throw new Exception("Invalid text symbol alignment!");
}
//（4）返回注记范围矩形
RectangleF sRect = new RectangleF(sTopLeftPoint, sLabelSize);
return(sRect);
}
/// <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!");
}
}
}
