public static void DrawAsBitmap(SKCanvas canvas, LabelStyle style, IFeature feature, float x, float y) { var text = style.GetLabelText(feature); var key = text + "_" + style.Font.FontFamily + "_" + style.Font.Size + "_" + (float)style.Font.Size + "_" + style.BackColor + "_" + style.ForeColor; if (!LabelBitmapCache.Keys.Contains(key)) LabelBitmapCache[key] = new SKBitmapInfo { Bitmap = CreateLabelAsBitmap(style, text) }; var info = LabelBitmapCache[key]; BitmapHelper.RenderTexture(canvas, info.Bitmap, (int)Math.Round(x), (int)Math.Round(y), offsetX: (float)style.Offset.X, offsetY: (float)-style.Offset.Y, horizontalAlignment: style.HorizontalAlignment, verticalAlignment: style.VerticalAlignment); }
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 Draw(SKCanvas canvas, LabelStyle style, IFeature feature, float x, float y) { var text = style.GetLabelText(feature); DrawLabel(canvas, x, y, style, text); }
private static List<Feature> GetFeaturesInView(double resolution, LabelStyle labelStyle, IEnumerable<IFeature> features, Pen line, Brush fill) { var margin = resolution*50; var clusters = new List<Cluster>(); // todo: repeat until there are no more merges ClusterFeatures(clusters, features, margin, labelStyle, resolution); const int textHeight = 18; var results = new List<Feature>(); foreach (var cluster in clusters) { if (cluster.Features.Count > 1) results.Add(CreateBoxFeature(resolution, cluster, line, fill)); var offsetY = double.NaN; var orderedFeatures = cluster.Features.OrderBy(f => f.Geometry.GetBoundingBox().GetCentroid().Y); foreach (var pointFeature in orderedFeatures) { var position = CalculatePosition(cluster); offsetY = CalculateOffsetY(offsetY, textHeight); var labelText = labelStyle.GetLabelText(pointFeature); var labelFeature = CreateLabelFeature(position, labelStyle, offsetY, labelText); results.Add(labelFeature); } } return results; }