public static Canvas RenderLabelLayer(IViewport viewport, LabelLayer layer)
{
var canvas = new Canvas { Opacity = layer.Opacity };
// todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution).ToList();
var layerStyles = BaseLayer.GetLayerStyles(layer);
foreach (var layerStyle in layerStyles)
{
foreach (var feature in features)
{
var style = (layerStyle is IThemeStyle) ? (layerStyle as IThemeStyle).GetStyle(feature) : layerStyle;
if ((style == null) ||
(style.Enabled == false) ||
(style.MinVisible > viewport.Resolution) ||
(style.MaxVisible < viewport.Resolution)) continue;
if (!(style is LabelStyle)) throw new Exception("Style of label is not a LabelStyle");
var labelStyle = style as LabelStyle;
labelStyle.Text = layer.GetLabelText(feature);
var postion = feature.Geometry.GetBoundingBox().GetCentroid();
var labelText = labelStyle.GetLabelText(feature);
canvas.Children.Add(SingleLabelRenderer.RenderLabel(postion, labelStyle, viewport, labelText));
}
}
return canvas;
}
public static Canvas RenderStackedLabelLayer(IViewport viewport, LabelLayer layer)
{
var canvas = new Canvas();
canvas.Opacity = layer.Opacity;
//todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution);
var margin = viewport.Resolution * 50;
foreach (var layerStyle in layer.Styles)
{
var style = layerStyle;
var clusters = new List<Cluster>();
//todo: repeat until there are no more merges
ClusterFeatures(clusters, features, margin, layerStyle, viewport.Resolution);
foreach (var cluster in clusters)
{
Offset stackOffset = null;
foreach (var feature in cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y))
{
if (layerStyle is IThemeStyle) style = (layerStyle as IThemeStyle).GetStyle(feature);
if ((style == null) || (style.Enabled == false) || (style.MinVisible > viewport.Resolution) || (style.MaxVisible < viewport.Resolution)) continue;
if (stackOffset == null) //first time
{
stackOffset = new Offset();
if (cluster.Features.Count > 1)
canvas.Children.Add(RenderBox(cluster.Box, viewport));
}
else stackOffset.Y += 18; //todo: get size from text, (or just pass stack nr)
if (!(style is LabelStyle)) throw new Exception("Style of label is not a LabelStyle");
var labelStyle = style as LabelStyle;
string labelText = layer.GetLabel(feature);
var position = new Mapsui.Geometries.Point(cluster.Box.GetCentroid().X, cluster.Box.Bottom);
canvas.Children.Add(RenderLabel(position, stackOffset, labelStyle, viewport, labelText));
}
}
}
return canvas;
}
public static Canvas Render(IViewport viewport, LabelLayer layer)
{
// todo: Move stack functionality to Mapsui core.
// step 1) Split RenderStackedLabelLayer into a method
// GetFeaturesInViewStacked en a RenderStackedLabel
// which can later be replace by normal label rendering.
// The method GetFeaturesInViewStacked
// returns a style with an offset determined by the stackoffset
// and a position determined by CenterX en Cluster.Box.Bottom.
// step 2) Move GetFeaturesInViewStacked to a GetFeaturesInView
// method of a new StackedLabelLayed.
var canvas = new Canvas { Opacity = layer.Opacity };
// todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution).ToArray();
var margin = viewport.Resolution * 50;
const int symbolSize = 32; // todo: determine margin by symbol size
const int boxMargin = symbolSize / 2;
var clusters = new List<Cluster>();
//todo: repeat until there are no more merges
ClusterFeatures(clusters, features, margin, layer.Style, viewport.Resolution);
const int textHeight = 18;
foreach (var cluster in clusters)
{
var stackOffsetY = double.NaN;
var orderedFeatures = cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y);
if (cluster.Features.Count > 1) canvas.Children.Add(RenderBox(cluster.Box, viewport));
foreach (var feature in orderedFeatures)
{
if (double.IsNaN(stackOffsetY)) // first time
stackOffsetY = textHeight * 0.5 + boxMargin;
else
stackOffsetY += textHeight; //todo: get size from text (or just pass stack nr)
LabelStyle style;
if (layer.Style is IThemeStyle)
{
style = (LabelStyle)((IThemeStyle)layer.Style).GetStyle(feature);
}
else
{
style = (LabelStyle)layer.Style;
}
var labelStyle = new LabelStyle(style)
{
Text = layer.GetLabelText(feature) //we only use the layer for the text, this should be returned by style
};
labelStyle.Offset.Y += stackOffsetY;
// since the box can be rotated, find the minimal Y value of all 4 corners
var rotatedBox = cluster.Box.Rotate(-viewport.Rotation);
var minY = rotatedBox.Vertices.Select(v => v.Y).Min();
var position = new Geometries.Point(cluster.Box.GetCentroid().X, minY);
var labelText = labelStyle.GetLabelText(feature);
canvas.Children.Add(SingleLabelRenderer.RenderLabel(position, labelStyle, viewport, labelText));
}
}
return canvas;
}
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 List<IFeature> RenderStackedLabelLayer(IViewport viewport, LabelLayer layer)
{
var renderedFeatures = new List<IFeature> ();
var canvas = new CALayer ();
canvas.Opacity = (float)layer.Opacity;
//todo: take into account the priority
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution);
var margin = viewport.Resolution * 50;
if(layer.Style != null)
{
var clusters = new List<Cluster>();
//todo: repeat until there are no more merges
ClusterFeatures(clusters, features, margin, layer.Style, viewport.Resolution);
foreach (var cluster in clusters)
{
var feature = cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y).FirstOrDefault();
//SetFeatureOutline (feature, layer.Name, cluster.Features.Count);
//var bb = RenderBox(cluster.Box, viewport);
//Zorg dat dit ALTIJD decimal zelfde ISet als ViewChanged is
//var feature = cluster.Features.FirstOrDefault ();
var styles = feature.Styles ?? Enumerable.Empty<IStyle>();
foreach (var style in styles)
{
if (feature.Styles != null && style.Enabled)
{
var styleKey = layer.Name; //feature.GetHashCode ().ToString ();
var renderedGeometry = (feature[styleKey] != null) ? (CALayer)feature[styleKey] : null;
var labelText = layer.GetLabelText(feature);
if (renderedGeometry == null) {
//Mapsui.Geometries.Point point, Offset stackOffset, LabelStyle style, IFeature feature, IViewport viewport, string text)
renderedGeometry = RenderLabel(feature.Geometry as Mapsui.Geometries.Point,
style as LabelStyle, feature, viewport, labelText);
feature [styleKey] = renderedGeometry;
feature ["first"] = true;
} else {
feature ["first"] = false;
}
}
}
renderedFeatures.Add (feature);
/*
Offset stackOffset = null;
foreach (var feature in cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y))
{
if (layerStyle is IThemeStyle) style = (layerStyle as IThemeStyle).GetStyle(feature);
if ((style == null) || (style.Enabled == false) || (style.MinVisible > viewport.Resolution) || (style.MaxVisible < viewport.Resolution)) continue;
if (stackOffset == null) //first time
{
stackOffset = new Offset();
if (cluster.Features.Count > 1)
canvas.AddSublayer (RenderBox(cluster.Box, viewport));
}
else stackOffset.Y += 18; //todo: get size from text, (or just pass stack nr)
if (!(style is LabelStyle)) throw new Exception("Style of label is not a LabelStyle");
var labelStyle = style as LabelStyle;
string labelText = layer.GetLabel(feature);
var position = new Mapsui.Geometries.Point(cluster.Box.GetCentroid().X, cluster.Box.Bottom);
canvas.AddSublayer(RenderLabel(position, stackOffset, labelStyle, feature, viewport, labelText));
}
*/
}
}
return renderedFeatures;
}
