public static void Render(Graphics graphics, IViewport viewport, LabelLayer labelLayer)
{
var layerStyles = BaseLayer.GetLayerStyles(labelLayer);
foreach (var layerStyle in layerStyles)
{
if (layerStyle.Enabled && labelLayer.MaxVisible >= viewport.Resolution && labelLayer.MinVisible < viewport.Resolution)
{
if (labelLayer.DataSource == null)
throw (new ApplicationException("DataSource property not set"));
graphics.SmoothingMode = SmoothingMode.AntiAlias;
var features = labelLayer.GetFeaturesInView(viewport.Extent, viewport.Resolution);
//Initialize label collection
var labels = new List<Label>();
var style = layerStyle as LabelStyle;
//List<System.Drawing.Rectangle> LabelBoxes; //Used for collision detection
//Render labels
foreach (IFeature feature in features)
{
if (layerStyle is IThemeStyle) style = (layerStyle as IThemeStyle).GetStyle(feature) as LabelStyle;
float rotation = 0;
if (!String.IsNullOrEmpty(labelLayer.RotationColumn))
rotation = float.Parse(feature[labelLayer.RotationColumn].ToString(), NumberStyles.Any, CultureInfo.InvariantCulture);
int priority = labelLayer.Priority;
if (labelLayer.PriorityDelegate != null)
priority = labelLayer.PriorityDelegate(feature);
else if (!String.IsNullOrEmpty(labelLayer.PriorityColumn))
priority = int.Parse(feature[labelLayer.PriorityColumn].ToString(), NumberStyles.Any, CultureInfo.InvariantCulture);
string text;
if (labelLayer.LabelStringDelegate != null)
{
text = labelLayer.LabelStringDelegate(feature);
}
else
{
text = feature[labelLayer.LabelColumn].ToString();
}
if (!string.IsNullOrEmpty(text))
{
if (feature.Geometry is GeometryCollection)
{
var geometryCollection = feature.Geometry as GeometryCollection;
if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.All)
{
foreach (var geometry in geometryCollection)
{
var label = CreateLabel(geometry, text, rotation, priority, style, viewport, graphics);
if (label != null) labels.Add(label);
}
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.CommonCenter)
{
var label = CreateLabel(feature.Geometry, text, rotation, priority, style, viewport, graphics);
if (label != null) labels.Add(label);
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.First)
{
if ((feature.Geometry as GeometryCollection).Collection.Count > 0)
{
Label label = CreateLabel(geometryCollection.Collection[0], text, rotation, 0,
style, viewport, graphics);
if (label != null) labels.Add(label);
}
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.Largest)
{
var coll = (feature.Geometry as GeometryCollection);
if (coll.NumGeometries > 0)
{
double largestVal = 0;
int idxOfLargest = 0;
for (var 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;
}
}
var label = CreateLabel(coll.Geometry(idxOfLargest), text, rotation, priority, style,
viewport, graphics);
if (label != null) labels.Add(label);
}
}
}
else
{
var label = CreateLabel(feature.Geometry, text, rotation, priority, style, viewport, graphics);
if (label != null) labels.Add(label);
}
}
}
if (labels.Count > 0) //We have labels to render...
{
if ((layerStyle is LabelStyle) && (layerStyle as LabelStyle).CollisionDetection && labelLayer.LabelFilter != null)
labelLayer.LabelFilter(labels);
foreach (Label label in labels)
{
if (!label.Show) continue;
LabelRenderer.DrawLabel(graphics, label.LabelPoint, label.Style.Offset, label.Style.Font,
label.Style.ForeColor, label.Style.BackColor, label.Halo, label.Rotation, label.Text, viewport);
}
}
}
}
}
public static void Render(Graphics g, IViewport viewport, LabelLayer labelLayer)
{
foreach (var layerStyle in labelLayer.Styles)
{
if (layerStyle.Enabled && labelLayer.MaxVisible >= viewport.Resolution && labelLayer.MinVisible < viewport.Resolution)
{
if (labelLayer.DataSource == null)
throw (new ApplicationException("DataSource property not set"));
#if !PocketPC
g.SmoothingMode = SmoothingMode.AntiAlias;
#endif
//!!!BoundingBox envelope = map.Envelope; //View to render
//!!!if (CoordinateTransformation != null)
//!!! envelope = GeometryTransform.TransformBox(envelope, CoordinateTransformation.MathTransform.Inverse());
labelLayer.DataSource.Open();
var features = labelLayer.DataSource.GetFeaturesInView(viewport.Extent, viewport.Resolution);
labelLayer.DataSource.Close();
//Initialize label collection
var labels = new List<Label>();
var style = layerStyle as LabelStyle;
//List<System.Drawing.Rectangle> LabelBoxes; //Used for collision detection
//Render labels
foreach (IFeature feature in features)
{
//!!!if (CoordinateTransformation != null)
//!!! features[i].Geometry = GeometryTransform.TransformGeometry(
//!!! features[i].Geometry, CoordinateTransformation. MathTransform);
if (layerStyle is IThemeStyle) style = (layerStyle as ThemeStyle).GetStyle(feature) as LabelStyle;
float rotation = 0;
if (!String.IsNullOrEmpty(labelLayer.RotationColumn))
rotation = float.Parse(feature[labelLayer.RotationColumn].ToString(), NumberStyles.Any, CultureInfo.InvariantCulture);
int priority = labelLayer.Priority;
if (labelLayer.PriorityDelegate != null)
priority = labelLayer.PriorityDelegate(feature);
else if (!String.IsNullOrEmpty(labelLayer.PriorityColumn))
priority = int.Parse(feature[labelLayer.PriorityColumn].ToString(), NumberStyles.Any, CultureInfo.InvariantCulture);
string text;
if (labelLayer.LabelStringDelegate != null)
text = labelLayer.LabelStringDelegate(feature);
else
text = feature[labelLayer.LabelColumn].ToString();
if (text != null && text != String.Empty)
{
if (feature.Geometry is GeometryCollection)
{
if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.All)
{
foreach (Geometry geom in (feature.Geometry as GeometryCollection))
{
Label lbl = CreateLabel(geom, text, rotation, priority, style, viewport, g, labelLayer);
if (lbl != null)
labels.Add(lbl);
}
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.CommonCenter)
{
Label lbl = CreateLabel(feature.Geometry, text, rotation, priority, style, viewport, g, labelLayer);
if (lbl != null)
labels.Add(lbl);
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.First)
{
//!!!
//if ((feature.Geometry as GeometryCollection).Collection.Count > 0)
//{
// Label lbl = CreateLabel((feature.Geometry as GeometryCollection).Collection[0], text,
// rotation, style, map, g, labelTheme);
// if (lbl != null)
// labels.Add(lbl);
//}
}
else if (labelLayer.MultipartGeometryBehaviour == LabelLayer.MultipartGeometryBehaviourEnum.Largest)
{
var 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 = ((LineString)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;
}
}
Label lbl = CreateLabel(coll.Geometry(idxOfLargest), text, rotation, priority, style,
viewport, g, labelLayer);
if (lbl != null)
labels.Add(lbl);
}
}
}
else
{
Label lbl = CreateLabel(feature.Geometry, text, rotation, priority, style, viewport, g, labelLayer);
if (lbl != null)
labels.Add(lbl);
}
}
}
if (labels.Count > 0) //We have labels to render...
{
if ((layerStyle as LabelStyle).CollisionDetection && labelLayer.LabelFilter != null)
labelLayer.LabelFilter(labels);
for (int i = 0; i < labels.Count; i++)
if (labels[i].Show)
GdiGeometryRenderer.DrawLabel(g, labels[i].LabelPoint, labels[i].Style.Offset,
labels[i].Style.Font, labels[i].Style.ForeColor,
labels[i].Style.BackColor, (layerStyle as LabelStyle).Halo, labels[i].Rotation,
labels[i].Text, viewport);
}
labels = null;
}
}
}
