/// <summary>
/// Renders the layer
/// </summary>
/// <param name="g">Graphics object reference</param>
/// <param name="map">Map which is rendered</param>
public override void Render(Graphics g, Map map)
{
if (Style.Enabled && Style.MaxVisible >= map.Zoom && Style.MinVisible < map.Zoom)
{
if (DataSource == null)
throw (new ApplicationException("DataSource property not set on layer '" + LayerName + "'"));
g.TextRenderingHint = TextRenderingHint;
g.SmoothingMode = SmoothingMode;
BoundingBox envelope = map.Envelope; //View to render
var lineClipping = new CohenSutherlandLineClipping(envelope.Min.X, envelope.Min.Y,
envelope.Max.X, envelope.Max.Y);
if (CoordinateTransformation != null)
{
#if !DotSpatialProjections
CoordinateTransformation.MathTransform.Invert();
envelope = GeometryTransform.TransformBox(envelope, CoordinateTransformation.MathTransform);
CoordinateTransformation.MathTransform.Invert();
#else
envelope = GeometryTransform.TransformBox(envelope, CoordinateTransformation.Target, CoordinateTransformation.Source);
#endif
}
FeatureDataSet ds = new FeatureDataSet();
DataSource.Open();
DataSource.ExecuteIntersectionQuery(envelope, ds);
DataSource.Close();
if (ds.Tables.Count == 0)
{
base.Render(g, map);
return;
}
FeatureDataTable features = ds.Tables[0];
//Initialize label collection
List<BaseLabel> labels = new List<BaseLabel>();
//List<System.Drawing.Rectangle> LabelBoxes; //Used for collision detection
//Render labels
for (int i = 0; i < features.Count; i++)
{
FeatureDataRow feature = features[i];
if (CoordinateTransformation != null)
#if !DotSpatialProjections
features[i].Geometry = GeometryTransform.TransformGeometry(features[i].Geometry,
CoordinateTransformation.
MathTransform);
#else
features[i].Geometry = GeometryTransform.TransformGeometry(features[i].Geometry,
CoordinateTransformation.Source,
CoordinateTransformation.Target);
#endif
LabelStyle style;
if (Theme != null) //If thematics is enabled, lets override the style
style = Theme.GetStyle(feature) as LabelStyle;
else
style = Style;
float rotationStyle = style != null ? style.Rotation : 0f;
float rotationColumn = 0f;
if (!String.IsNullOrEmpty(RotationColumn))
Single.TryParse(feature[RotationColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out rotationColumn);
float rotation = rotationStyle + rotationColumn;
int priority = Priority;
if (_getPriorityMethod != null)
priority = _getPriorityMethod(feature);
else if (!String.IsNullOrEmpty(PriorityColumn))
Int32.TryParse(feature[PriorityColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out priority);
string text;
if (_getLabelMethod != null)
text = _getLabelMethod(feature);
else
text = feature[LabelColumn].ToString();
if (!String.IsNullOrEmpty(text))
{
// for lineal geometries, try clipping to ensure proper labeling
if (feature.Geometry is ILineal)
{
if (feature.Geometry is LineString)
feature.Geometry = lineClipping.ClipLineString(feature.Geometry as LineString);
else if (feature.Geometry is MultiLineString)
feature.Geometry = lineClipping.ClipLineString(feature.Geometry as MultiLineString);
}
if (feature.Geometry is GeometryCollection)
{
if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.All)
{
foreach (Geometry geom in (feature.Geometry as GeometryCollection))
{
BaseLabel lbl = CreateLabel(geom, text, rotation, priority, style, map, g);
if (lbl != null)
labels.Add(lbl);
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.CommonCenter)
{
BaseLabel lbl = CreateLabel(feature.Geometry, text, rotation, priority, style, map, g);
if (lbl != null)
labels.Add(lbl);
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.First)
{
if ((feature.Geometry as GeometryCollection).Collection.Count > 0)
{
BaseLabel lbl = CreateLabel((feature.Geometry as GeometryCollection).Collection[0], text,
rotation, style, map, g);
if (lbl != null)
labels.Add(lbl);
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.Largest)
{
GeometryCollection coll = (feature.Geometry as GeometryCollection);
if (coll.NumGeometries > 0)
{
double largestVal = 0;
int idxOfLargest = 0;
for (int j = 0; j < coll.NumGeometries; j++)
{
Geometry geom = coll.Geometry(j);
if (geom is LineString && ((LineString) geom).Length > largestVal)
{
largestVal = ((LineString) geom).Length;
idxOfLargest = j;
}
if (geom is MultiLineString && ((MultiLineString) geom).Length > largestVal)
{
largestVal = ((MultiLineString)geom).Length;
idxOfLargest = j;
}
if (geom is Polygon && ((Polygon) geom).Area > largestVal)
{
largestVal = ((Polygon) geom).Area;
idxOfLargest = j;
}
if (geom is MultiPolygon && ((MultiPolygon) geom).Area > largestVal)
{
largestVal = ((MultiPolygon) geom).Area;
idxOfLargest = j;
}
}
BaseLabel lbl = CreateLabel(coll.Geometry(idxOfLargest), text, rotation, priority, style,
map, g);
if (lbl != null)
labels.Add(lbl);
}
}
}
else
{
BaseLabel lbl = CreateLabel(feature.Geometry, text, rotation, priority, style, map, g);
if (lbl != null)
labels.Add(lbl);
}
}
}
if (labels.Count > 0) //We have labels to render...
{
if (Style.CollisionDetection && _labelFilter != null)
_labelFilter(labels);
for (int i = 0; i < labels.Count; i++)
{
// Don't show the label if not necessary
if (!labels[i].Show)
{
continue;
}
if (labels[i] is Label)
{
var label = labels[i] as Label;
VectorRenderer.DrawLabel(g, label.Location, label.Style.Offset,
label.Style.Font, label.Style.ForeColor,
label.Style.BackColor, Style.Halo, label.Rotation,
label.Text, map);
}
else if (labels[i] is PathLabel)
{
var plbl = labels[i] as PathLabel;
var lblStyle = plbl.Style;
g.DrawString(lblStyle.Halo, new SolidBrush(lblStyle.ForeColor), plbl.Text,
lblStyle.Font.FontFamily, (int) lblStyle.Font.Style, lblStyle.Font.Size,
lblStyle.GetStringFormat(), lblStyle.IgnoreLength, plbl.Location);
}
}
}
}
base.Render(g, map);
}
/// <summary>
/// Renders the layer
/// </summary>
/// <param name="g">Graphics object reference</param>
/// <param name="map">Map which is rendered</param>
public override void Render(Graphics g, Map map)
{
if (Style.Enabled && Style.MaxVisible >= map.Zoom && Style.MinVisible < map.Zoom)
{
if (DataSource == null)
throw (new ApplicationException("DataSource property not set on layer '" + LayerName + "'"));
g.TextRenderingHint = TextRenderingHint;
g.SmoothingMode = SmoothingMode;
var envelope = map.Envelope; //View to render
var lineClipping = new CohenSutherlandLineClipping(envelope.MinX, envelope.MinY,
envelope.MaxX, envelope.MaxY);
if (CoordinateTransformation != null)
{
#if !DotSpatialProjections
if (ReverseCoordinateTransformation != null)
{
envelope = GeometryTransform.TransformBox(envelope, ReverseCoordinateTransformation.MathTransform);
}
else
{
CoordinateTransformation.MathTransform.Invert();
envelope = GeometryTransform.TransformBox(envelope, CoordinateTransformation.MathTransform);
CoordinateTransformation.MathTransform.Invert();
}
#else
envelope = GeometryTransform.TransformBox(envelope, CoordinateTransformation.Target, CoordinateTransformation.Source);
#endif
}
var ds = new FeatureCollectionSet();
DataSource.Open();
DataSource.ExecuteIntersectionQuery(envelope, ds);
DataSource.Close();
if (ds.Count == 0)
{
base.Render(g, map);
return;
}
var features = ds[0];
//Initialize label collection
List<BaseLabel> labels = new List<BaseLabel>();
//List<System.Drawing.Rectangle> LabelBoxes; //Used for collision detection
//Render labels
foreach(var feature in features)
{
var featureGeometry = (IGeometry)feature.Geometry.Clone();
if (CoordinateTransformation != null)
#if !DotSpatialProjections
featureGeometry = GeometryTransform.TransformGeometry(
featureGeometry, CoordinateTransformation.MathTransform,
GeometryServiceProvider.Instance.CreateGeometryFactory((int)CoordinateTransformation.TargetCS.AuthorityCode)
);
#else
featuresGeometry = GeometryTransform.TransformGeometry(features[i].Geometry,
CoordinateTransformation.Source,
CoordinateTransformation.Target,
CoordinateTransformation.TargetFactory);
#endif
LabelStyle style;
if (Theme != null) //If thematics is enabled, lets override the style
style = Theme.GetStyle(feature) as LabelStyle;
else
style = Style;
float rotationStyle = style != null ? style.Rotation : 0f;
float rotationColumn = 0f;
if (!String.IsNullOrEmpty(RotationColumn))
Single.TryParse(feature.Attributes[RotationColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out rotationColumn);
float rotation = rotationStyle + rotationColumn;
int priority = Priority;
if (_getPriorityMethod != null)
priority = _getPriorityMethod(feature);
else if (!String.IsNullOrEmpty(PriorityColumn))
Int32.TryParse(feature.Attributes[PriorityColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out priority);
string text;
if (_getLabelMethod != null)
text = _getLabelMethod(feature);
else
text = feature.Attributes[LabelColumn].ToString();
if (!String.IsNullOrEmpty(text))
{
// for lineal geometries, try clipping to ensure proper labeling
if (featureGeometry is ILineal)
{
if (featureGeometry is ILineString)
featureGeometry = lineClipping.ClipLineString(featureGeometry as ILineString);
else if (featureGeometry is IMultiLineString)
featureGeometry = lineClipping.ClipLineString(featureGeometry as IMultiLineString);
}
if (featureGeometry is IGeometryCollection)
{
if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.All)
{
foreach (var geom in (featureGeometry as IGeometryCollection))
{
BaseLabel lbl = CreateLabel(feature, geom, text, rotation, priority, style, map, g, _getLocationMethod);
if (lbl != null)
labels.Add(lbl);
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.CommonCenter)
{
BaseLabel lbl = CreateLabel(feature, featureGeometry, text, rotation, priority, style, map, g, _getLocationMethod);
if (lbl != null) labels.Add(lbl);
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.First)
{
if ((featureGeometry as IGeometryCollection).NumGeometries > 0)
{
BaseLabel lbl = CreateLabel(feature, (featureGeometry as IGeometryCollection).GetGeometryN(0), text,
rotation, style, map, g);
if (lbl != null)
labels.Add(lbl);
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.Largest)
{
var coll = (featureGeometry as IGeometryCollection);
if (coll.NumGeometries > 0)
{
var largestVal = 0d;
var idxOfLargest = 0;
for (var j = 0; j < coll.NumGeometries; j++)
{
var geom = coll.GetGeometryN(j);
if (geom is ILineString && ((ILineString) geom).Length > largestVal)
{
largestVal = ((ILineString) geom).Length;
idxOfLargest = j;
}
if (geom is IMultiLineString && ((IMultiLineString) geom).Length > largestVal)
{
largestVal = ((IMultiLineString)geom).Length;
idxOfLargest = j;
}
if (geom is IPolygon && ((IPolygon) geom).Area > largestVal)
{
largestVal = ((IPolygon) geom).Area;
idxOfLargest = j;
}
if (geom is IMultiPolygon && ((IMultiPolygon) geom).Area > largestVal)
{
largestVal = ((IMultiPolygon) geom).Area;
idxOfLargest = j;
}
}
BaseLabel lbl = CreateLabel(feature, coll.GetGeometryN(idxOfLargest), text, rotation, priority, style,
map, g, _getLocationMethod);
if (lbl != null)
labels.Add(lbl);
}
}
}
else
{
BaseLabel lbl = CreateLabel(feature, featureGeometry, text, rotation, priority, style, map, g, _getLocationMethod);
if (lbl != null)
labels.Add(lbl);
}
}
}
if (labels.Count > 0) //We have labels to render...
{
if (Style.CollisionDetection && _labelFilter != null)
_labelFilter(labels);
for (int i = 0; i < labels.Count; i++)
{
// Don't show the label if not necessary
if (!labels[i].Show)
{
continue;
}
if (labels[i] is Label)
{
var label = labels[i] as Label;
if (label.Style.IsTextOnPath == false || label.TextOnPathLabel==null)
{
VectorRenderer.DrawLabel(g, label.Location, label.Style.Offset,
label.Style.Font, label.Style.ForeColor,
label.Style.BackColor, label.Style.Halo, label.Rotation,
label.Text, map, label.Style.HorizontalAlignment,
label.LabelPoint);
}
else
{
if (label.Style.BackColor != null && label.Style.BackColor != System.Drawing.Brushes.Transparent)
{
//draw background
if (label.TextOnPathLabel.RegionList.Count > 0)
{
g.FillRectangles(labels[i].Style.BackColor, labels[i].TextOnPathLabel.RegionList.ToArray());
//g.FillPolygon(labels[i].Style.BackColor, labels[i].TextOnPathLabel.PointsText.ToArray());
}
}
label.TextOnPathLabel.DrawTextOnPath();
}
}
else if (labels[i] is PathLabel)
{
var plbl = labels[i] as PathLabel;
var lblStyle = plbl.Style;
g.DrawString(lblStyle.Halo, new SolidBrush(lblStyle.ForeColor), plbl.Text,
lblStyle.Font.FontFamily, (int) lblStyle.Font.Style, lblStyle.Font.Size,
lblStyle.GetStringFormat(), lblStyle.IgnoreLength, plbl.Location);
}
}
}
}
base.Render(g, map);
}
