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 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 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;
}
public static CALayer RenderLabelLayer(IViewport viewport, LabelLayer layer, List<IFeature> features)
{
var canvas = new CALayer();
canvas.Opacity = (float)layer.Opacity;
//todo: take into account the priority
var stackOffset = new Offset();
if (layer.Style != null)
{
var style = layer.Style;
foreach (var feature in features)
{
if (style is IThemeStyle) style = (style 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.GetLabelText(feature);
var label = RenderLabel (feature.Geometry as Mapsui.Geometries.Point,
style as LabelStyle, feature, viewport, labelText);
canvas.AddSublayer(label);
}
}
return canvas;
}
