/// <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, MapViewport map)
{
if (DataSource == null)
{
throw (new ApplicationException("DataSource property not set on layer '" + LayerName + "'"));
}
var layerEnvelope = ToSource(map.Envelope); //View to render
List <BaseLabel> labels = null;
using (var ds = new FeatureDataSet())
{
DataSource.Open();
DataSource.ExecuteIntersectionQuery(layerEnvelope, ds);
DataSource.Close();
if (ds.Tables.Count > 0)
{
g.TextRenderingHint = TextRenderingHint;
g.SmoothingMode = SmoothingMode;
labels = CreateLabelDefinitions(g, map, ds.Tables[0]);
}
}
if (labels == null || labels.Count == 0)
{
// Obsolete (and will cause infinite loop)
//base.Render(g, map);
return;
}
if (Style.CollisionDetection)
{
_labelFilter?.Invoke(labels);
}
var combinedArea = RectangleF.Empty;
for (int i = 0; i < labels.Count; i++)
{
var baseLabel = labels[i];
if (!baseLabel.Show)
{
continue;
}
var font = baseLabel.Style.GetFontForGraphics(g);
if (labels[i] is Label)
{
var label = baseLabel as Label;
var canvasArea = VectorRenderer.DrawLabelEx(
g, label.Location, label.Style.Offset,
font, label.Style.ForeColor, label.Style.BackColor,
label.Style.Halo, label.Rotation, label.Text, map,
label.Style.HorizontalAlignment, label.LabelPoint);
combinedArea = canvasArea.ExpandToInclude(combinedArea);
}
else if (labels[i] is PathLabel)
{
var pathLabel = labels[i] as PathLabel;
var lblStyle = pathLabel.Style;
var background = pathLabel.AffectedArea.ExteriorRing.TransformToImage(map);
if (lblStyle.BackColor != null && lblStyle.BackColor != Brushes.Transparent)
{
using (var gp = new GraphicsPath())
{
gp.AddPolygon(background);
g.FillPath(lblStyle.BackColor, gp);
}
}
g.DrawString(lblStyle.Halo, new SolidBrush(lblStyle.ForeColor),
pathLabel.Text, font.FontFamily, (int)font.Style, font.Size,
lblStyle.GetStringFormat(), lblStyle.IgnoreLength, pathLabel.Location, pathLabel.Box.Height);
combinedArea = background.ToRectangleF().ExpandToInclude(combinedArea);
}
}
CanvasArea = combinedArea;
// Obsolete (and will cause infinite loop)
//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, IMapViewPort map)
{
if (DataSource == null)
{
throw (new ApplicationException("DataSource property not set on layer '" + LayerName + "'"));
}
g.TextRenderingHint = TextRenderingHint;
g.SmoothingMode = SmoothingMode;
var mapEnvelope = map.Envelope;
var layerEnvelope = ToSource(mapEnvelope); //View to render
var lineClipping = new CohenSutherlandLineClipping(mapEnvelope.MinX, mapEnvelope.MinY,
mapEnvelope.MaxX, mapEnvelope.MaxY);
var ds = _dataCache;
if (ds == null || ds.Tables.Count == 0)
{
base.Render(g, map);
return;
}
var features = ds.Tables[0];
//Initialize label collection
var labels = new List <BaseLabel>();
//List<System.Drawing.Rectangle> LabelBoxes; //Used for collision detection
//Render labels
for (var i = 0; i < features.Count; i++)
{
var feature = features[i];
LabelStyle style;
if (Theme != null) //If thematics is enabled, lets override the style
{
style = Theme.GetStyle(feature) as LabelStyle;
}
else
{
style = Style;
}
var rotationStyle = style?.Rotation ?? 0f;
var rotationColumn = 0f;
if (!string.IsNullOrEmpty(RotationColumn))
{
float.TryParse(feature[RotationColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out rotationColumn);
}
var rotation = rotationStyle + rotationColumn;
var priority = Priority;
if (_getPriorityMethod != null)
{
priority = _getPriorityMethod(feature);
}
else if (!string.IsNullOrEmpty(PriorityColumn))
{
int.TryParse(feature[PriorityColumn].ToString(), NumberStyles.Any, Map.NumberFormatEnUs,
out priority);
}
string text;
text = _getLabelMethod != null?_getLabelMethod(feature) : 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 ILineString)
{
feature.Geometry = lineClipping.ClipLineString(feature.Geometry as ILineString);
}
else if (feature.Geometry is IMultiLineString)
{
feature.Geometry = lineClipping.ClipLineString(feature.Geometry as IMultiLineString);
}
}
if (feature.Geometry is IGeometryCollection)
{
if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.All)
{
foreach (var geom in (feature.Geometry as IGeometryCollection))
{
var lbl = CreateLabel(feature, geom, text, rotation, priority, style, map, g, _getLocationMethod);
if (lbl != null)
{
labels.Add(lbl);
}
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.CommonCenter)
{
var lbl = CreateLabel(feature, feature.Geometry, text, rotation, priority, style, map, g, _getLocationMethod);
if (lbl != null)
{
labels.Add(lbl);
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.First)
{
if ((feature.Geometry as IGeometryCollection).NumGeometries > 0)
{
var lbl = CreateLabel(feature, (feature.Geometry as IGeometryCollection).GetGeometryN(0), text,
rotation, style, map, g);
if (lbl != null)
{
labels.Add(lbl);
}
}
}
else if (MultipartGeometryBehaviour == MultipartGeometryBehaviourEnum.Largest)
{
var coll = (feature.Geometry 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;
}
}
var lbl = CreateLabel(feature, coll.GetGeometryN(idxOfLargest), text, rotation, priority, style,
map, g, _getLocationMethod);
if (lbl != null)
{
labels.Add(lbl);
}
}
}
}
else
{
var lbl = CreateLabel(feature, feature.Geometry, 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?.Invoke(labels);
}
for (var 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.GetFontForGraphics(g), 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);
}