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 RenderLabelLayer(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).ToList();
var stackOffset = new Offset();
foreach (var layerStyle in layer.Styles)
{
var style = layerStyle;
foreach (var feature in features)
{
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 (!(style is LabelStyle))
{
throw new Exception("Style of label is not a LabelStyle");
}
var labelStyle = style as LabelStyle;
string labelText = layer.GetLabel(feature);
canvas.Children.Add(RenderLabel(feature.Geometry.GetBoundingBox().GetCentroid(),
stackOffset, labelStyle, viewport, labelText));
}
}
return(canvas);
}