private static void RenderFeature(IViewport viewport, Canvas canvas, IFeature feature, IStyle style,
bool rasterizing, BrushCache brushCache = null)
{
if (style is LabelStyle)
{
var labelStyle = (LabelStyle)style;
canvas.Children.Add(SingleLabelRenderer.RenderLabel(feature.Geometry.GetBoundingBox().GetCentroid(),
labelStyle, viewport, labelStyle.GetLabelText(feature)));
}
else
{
var renderedGeometry = feature.RenderedGeometry.ContainsKey(style)
? feature.RenderedGeometry[style] as Shape
: null;
if (renderedGeometry == null)
{
renderedGeometry = RenderGeometry(viewport, style, feature, brushCache);
if (!rasterizing)
{
feature.RenderedGeometry[style] = renderedGeometry;
}
}
else
{
PositionGeometry(renderedGeometry, viewport, style, feature);
}
if (!canvas.Children.Contains(renderedGeometry))
{
// Adding twice can happen when a single feature has two identical styles
canvas.Children.Add(renderedGeometry);
}
}
}
private static void RenderFeature(IViewport viewport, Canvas canvas, IFeature feature, IStyle style, SymbolCache symbolCache, bool rasterizing)
{
if (style is LabelStyle)
{
var labelStyle = (LabelStyle)style;
canvas.Children.Add(SingleLabelRenderer.RenderLabel(feature.Geometry.GetBoundingBox().GetCentroid(),
labelStyle, viewport, labelStyle.GetLabelText(feature)));
}
else
{
Shape renderedGeometry;
object cachedObject;
if (feature.RenderedGeometry.TryGetValue(style, out cachedObject))
{
renderedGeometry = (Shape)cachedObject; // Has to be Shape
PositionGeometry(renderedGeometry, viewport, style, feature);
}
else
{
renderedGeometry = RenderGeometry(viewport, style, feature, symbolCache);
if (!rasterizing)
{
feature.RenderedGeometry[style] = renderedGeometry;
}
}
if (!canvas.Children.Contains(renderedGeometry))
{
// Adding twice can happen when a single feature has two identical styles
canvas.Children.Add(renderedGeometry);
}
}
}
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 Point(cluster.Box.GetCentroid().X, minY);
var labelText = labelStyle.GetLabelText(feature);
canvas.Children.Add(SingleLabelRenderer.RenderLabel(position, labelStyle, viewport, labelText));
}
}
return(canvas);
}