/// <summary>
/// Method to render this layer to the map, applying <see cref="Style"/>.
/// </summary>
/// <param name="g">The graphics object</param>
/// <param name="map">The map object</param>
/// <param name="envelope">The envelope to render</param>
protected void RenderInternal(Graphics g, MapViewport map, Envelope envelope)
{
//if style is not enabled, we don't need to render anything
if (!Style.Enabled)
{
return;
}
IEnumerable <IStyle> stylesToRender = GetStylesToRender(Style);
if (stylesToRender == null)
{
return;
}
var canvasArea = RectangleF.Empty;
var combinedArea = RectangleF.Empty;
Collection <IGeometry> geoms = null;
foreach (var style in stylesToRender)
{
if (!(style is VectorStyle) || !style.Enabled)
{
continue;
}
using (var vStyle = (style as VectorStyle).Clone())
{
if (vStyle != null)
{
if (geoms == null)
{
lock (_dataSource)
{
// Is datasource already open?
bool wasOpen = DataSource.IsOpen;
if (!wasOpen)
{
DataSource.Open();
}
// Read data
geoms = DataSource.GetGeometriesInView(envelope);
if (!wasOpen)
{
DataSource.Close();
}
}
if (_logger.IsDebugEnabled)
{
_logger.DebugFormat("Layer {0}, NumGeometries {1}", LayerName, geoms.Count);
}
// Transform geometries if necessary
if (CoordinateTransformation != null)
{
for (int i = 0; i < geoms.Count; i++)
{
geoms[i] = ToTarget(geoms[i]);
}
}
}
if (vStyle.LineSymbolizer != null)
{
vStyle.LineSymbolizer.Begin(g, map, geoms.Count);
}
else
{
//Linestring outlines is drawn by drawing the layer once with a thicker line
//before drawing the "inline" on top.
if (vStyle.EnableOutline)
{
foreach (var geom in geoms)
{
if (geom != null)
{
//Draw background of all line-outlines first
if (geom is ILineString)
{
canvasArea = VectorRenderer.DrawLineStringEx(g, geom as ILineString, vStyle.Outline, map, vStyle.LineOffset);
}
else if (geom is IMultiLineString)
{
canvasArea = VectorRenderer.DrawMultiLineStringEx(g, geom as IMultiLineString, vStyle.Outline, map, vStyle.LineOffset);
}
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
}
}
}
foreach (IGeometry geom in geoms)
{
if (geom != null)
{
canvasArea = RenderGeometryEx(g, map, geom, vStyle);
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
}
if (vStyle.LineSymbolizer != null)
{
vStyle.LineSymbolizer.Symbolize(g, map);
vStyle.LineSymbolizer.End(g, map);
}
}
}
}
CanvasArea = combinedArea;
}
/// <summary>
/// Function to render <paramref name="feature"/> using <paramref name="style"/> and returning the area covered.
/// </summary>
/// <param name="g">The graphics object</param>
/// <param name="map">The map</param>
/// <param name="feature">The feature's geometry</param>
/// <param name="style">The style to apply</param>
protected RectangleF RenderGeometryEx(Graphics g, MapViewport map, IGeometry feature, VectorStyle style)
{
if (feature == null)
{
return(RectangleF.Empty);
}
var geometryType = feature.OgcGeometryType;
switch (geometryType)
{
case OgcGeometryType.Polygon:
if (style.EnableOutline)
{
return(VectorRenderer.DrawPolygonEx(g, (IPolygon)feature, style.Fill, style.Outline, _clippingEnabled,
map));
}
else
{
return(VectorRenderer.DrawPolygonEx(g, (IPolygon)feature, style.Fill, null, _clippingEnabled, map));
}
case OgcGeometryType.MultiPolygon:
if (style.EnableOutline)
{
return(VectorRenderer.DrawMultiPolygonEx(g, (IMultiPolygon)feature, style.Fill, style.Outline, _clippingEnabled, map));
}
return(VectorRenderer.DrawMultiPolygonEx(g, (IMultiPolygon)feature, style.Fill, null, _clippingEnabled, map));
case OgcGeometryType.LineString:
if (style.LineSymbolizer != null)
{
style.LineSymbolizer.Render(map, (ILineString)feature, g);
return(RectangleF.Empty);
}
return(VectorRenderer.DrawLineStringEx(g, (ILineString)feature, style.Line, map, style.LineOffset));
case OgcGeometryType.MultiLineString:
if (style.LineSymbolizer != null)
{
style.LineSymbolizer.Render(map, (IMultiLineString)feature, g);
return(RectangleF.Empty);
}
return(VectorRenderer.DrawMultiLineStringEx(g, (IMultiLineString)feature, style.Line, map, style.LineOffset));
case OgcGeometryType.Point:
if (style.PointSymbolizer != null)
{
return(VectorRenderer.DrawPointEx(style.PointSymbolizer, g, (IPoint)feature, map));
}
if (style.Symbol != null || style.PointColor == null)
{
return(VectorRenderer.DrawPointEx(g, (IPoint)feature, style.Symbol, style.SymbolScale, style.SymbolOffset,
style.SymbolRotation, map));
}
return(VectorRenderer.DrawPointEx(g, (IPoint)feature, style.PointColor, style.PointSize, style.SymbolOffset, map));
case OgcGeometryType.MultiPoint:
if (style.PointSymbolizer != null)
{
return(VectorRenderer.DrawMultiPointEx(style.PointSymbolizer, g, (IMultiPoint)feature, map));
}
if (style.Symbol != null || style.PointColor == null)
{
return(VectorRenderer.DrawMultiPointEx(g, (IMultiPoint)feature, style.Symbol, style.SymbolScale, style.SymbolOffset, style.SymbolRotation, map));
}
return(VectorRenderer.DrawMultiPointEx(g, (IMultiPoint)feature, style.PointColor, style.PointSize, style.SymbolOffset, map));
case OgcGeometryType.GeometryCollection:
var coll = (IGeometryCollection)feature;
var combinedArea = RectangleF.Empty;
for (var i = 0; i < coll.NumGeometries; i++)
{
IGeometry geom = coll[i];
var canvasArea = RenderGeometryEx(g, map, geom, style);
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
return(combinedArea);
}
throw new NotSupportedException();
}
/// <summary>
/// Method to render this layer to the map, applying <paramref name="theme"/>.
/// </summary>
/// <param name="g">The graphics object</param>
/// <param name="map">The map object</param>
/// <param name="envelope">The envelope to render</param>
/// <param name="theme">The theme to apply</param>
protected void RenderInternal(Graphics g, MapViewport map, Envelope envelope, ITheme theme)
{
var canvasArea = RectangleF.Empty;
var combinedArea = RectangleF.Empty;
var ds = new FeatureDataSet();
lock (_dataSource)
{
// Is datasource already open?
bool wasOpen = DataSource.IsOpen;
if (!wasOpen)
{
DataSource.Open();
}
DataSource.ExecuteIntersectionQuery(envelope, ds);
if (!wasOpen)
{
DataSource.Close();
}
}
double scale = map.GetMapScale((int)g.DpiX);
double zoom = map.Zoom;
Func <MapViewport, FeatureDataRow, IStyle> evalStyle;
if (theme is IThemeEx)
{
evalStyle = new ThemeExEvaluator((IThemeEx)theme).GetStyle;
}
else
{
evalStyle = new ThemeEvaluator(theme).GetStyle;
}
foreach (FeatureDataTable features in ds.Tables)
{
// Transform geometries if necessary
if (CoordinateTransformation != null)
{
for (int i = 0; i < features.Count; i++)
{
features[i].Geometry = ToTarget(features[i].Geometry);
}
}
//Linestring outlines is drawn by drawing the layer once with a thicker line
//before drawing the "inline" on top.
if (Style.EnableOutline)
{
for (int i = 0; i < features.Count; i++)
{
var feature = features[i];
var outlineStyle = evalStyle(map, feature) as VectorStyle;
if (outlineStyle == null)
{
continue;
}
if (!(outlineStyle.Enabled && outlineStyle.EnableOutline))
{
continue;
}
var compare = outlineStyle.VisibilityUnits == VisibilityUnits.ZoomLevel ? zoom : scale;
if (!(outlineStyle.MinVisible <= compare && compare <= outlineStyle.MaxVisible))
{
continue;
}
using (outlineStyle = outlineStyle.Clone())
{
if (outlineStyle != null)
{
//Draw background of all line-outlines first
if (feature.Geometry is ILineString)
{
canvasArea = VectorRenderer.DrawLineStringEx(g, feature.Geometry as ILineString, outlineStyle.Outline,
map, outlineStyle.LineOffset);
}
else if (feature.Geometry is IMultiLineString)
{
canvasArea = VectorRenderer.DrawMultiLineStringEx(g, feature.Geometry as IMultiLineString,
outlineStyle.Outline, map, outlineStyle.LineOffset);
}
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
}
}
}
for (int i = 0; i < features.Count; i++)
{
var feature = features[i];
var style = evalStyle(map, feature);
if (style == null)
{
continue;
}
if (!style.Enabled)
{
continue;
}
double compare = style.VisibilityUnits == VisibilityUnits.ZoomLevel ? zoom : scale;
if (!(style.MinVisible <= compare && compare <= style.MaxVisible))
{
continue;
}
IEnumerable <IStyle> stylesToRender = GetStylesToRender(style);
if (stylesToRender == null)
{
return;
}
foreach (var vstyle in stylesToRender)
{
if (!(vstyle is VectorStyle) || !vstyle.Enabled)
{
continue;
}
using (var clone = (vstyle as VectorStyle).Clone())
{
if (clone != null)
{
canvasArea = RenderGeometryEx(g, map, feature.Geometry, clone);
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
}
}
}
}
CanvasArea = combinedArea;
}