public static System.Windows.Shapes.Shape RenderPolygon(Polygon polygon, IStyle style, IViewport viewport, SymbolCache symbolCache)
{
if (!(style is VectorStyle))
{
throw new ArgumentException("Style is not of type VectorStyle");
}
var vectorStyle = style as VectorStyle;
System.Windows.Shapes.Path path = CreatePolygonPath(vectorStyle, viewport.Resolution, symbolCache, (float)viewport.Rotation);
path.Data = polygon.ToXaml();
var matrixTransform = new System.Windows.Media.MatrixTransform {
Matrix = GeometryRenderer.CreateTransformMatrix1(viewport)
};
path.RenderTransform = matrixTransform;
if (path.Fill != null)
{
path.Fill.Transform = matrixTransform.Inverse as System.Windows.Media.MatrixTransform;
}
path.UseLayoutRounding = true;
return(path);
}
private static XamlShapes.Shape CreateSymbolFromBitmap(int bitmapId, double opacity, SymbolCache symbolCache)
{
var imageBrush = symbolCache.GetOrCreate(bitmapId).ToImageBrush();
// note: It probably makes more sense to use PixelWidth here:
var width = imageBrush.ImageSource.Width;
var height = imageBrush.ImageSource.Height;
var path = new XamlShapes.Path
{
Data = new XamlMedia.RectangleGeometry
{
Rect = new Rect(-width * 0.5, -height * 0.5, width, height)
},
Fill = imageBrush,
Opacity = opacity
};
return(path);
}
private static XamlMedia.Brush ToXaml(Brush brush, SymbolCache symbolCache, float rotate = 0f)
{
return(brush != null && (brush.Color != null || brush.BitmapId != -1) ?
brush.ToXaml(symbolCache, rotate) : new XamlMedia.SolidColorBrush(XamlColors.Transparent));
}
public static System.Windows.Shapes.Path CreatePolygonPath(VectorStyle style, double resolution, SymbolCache symbolCache, float rotate = 0f)
{
var path = new System.Windows.Shapes.Path {
Opacity = style.Opacity
};
if (style.Outline != null)
{
path.Stroke = new System.Windows.Media.SolidColorBrush(style.Outline.Color.ToXaml());
path.StrokeThickness = style.Outline.Width * resolution;
path.StrokeDashArray = style.Outline.PenStyle.ToXaml(style.Outline.DashArray);
path.StrokeLineJoin = style.Outline.StrokeJoin.ToXaml();
path.StrokeMiterLimit = style.Outline.StrokeMiterLimit;
path.Tag = style.Outline.Width; // see #linewidthhack
}
path.Fill = style.Fill.ToXaml(symbolCache, rotate);
path.IsHitTestVisible = false;
return(path);
}
public static Media.Brush ToXaml(this Brush brush, SymbolCache symbolCache = null)
{
return(StyleConverter.MapsuiBrushToXaml(brush, symbolCache));
}
private static XamlShapes.Shape CreateSymbolFromVectorStyle(VectorStyle style, double opacity = 1,
SymbolType symbolType = SymbolType.Ellipse, SymbolCache symbolCache = null, float rotate = 0f)
{
// The SL StrokeThickness default is 1 which causes blurry bitmaps
var path = new XamlShapes.Path
{
StrokeThickness = 0,
Fill = ToXaml(style.Fill, symbolCache, rotate)
};
if (style.Outline != null)
{
path.Stroke = new XamlMedia.SolidColorBrush(style.Outline.Color.ToXaml());
path.StrokeThickness = style.Outline.Width;
path.StrokeDashArray = style.Outline.PenStyle.ToXaml(style.Outline.DashArray);
}
switch (symbolType)
{
case SymbolType.Ellipse:
path.Data = CreateEllipse(SymbolStyle.DefaultWidth, SymbolStyle.DefaultHeight);
break;
case SymbolType.Rectangle:
path.Data = CreateRectangle(SymbolStyle.DefaultWidth, SymbolStyle.DefaultHeight);
break;
case SymbolType.Triangle:
path.Data = CreateTriangle(SymbolStyle.DefaultWidth);
break;
default: // Invalid value
throw new ArgumentOutOfRangeException();
}
path.Opacity = opacity;
return(path);
}
private static void RenderFeature(IViewport viewport, Canvas canvas, IFeature feature, IStyle style, SymbolCache symbolCache, bool rasterizing)
{
if (style is LabelStyle)
{
var labelStyle = (LabelStyle)style;
var labelText = labelStyle.GetLabelText(feature);
if (string.IsNullOrEmpty(labelText))
{
return;
}
canvas.Children.Add(LabelRenderer.RenderLabel(feature.Geometry.GetBoundingBox().GetCentroid(),
labelStyle, viewport, labelText));
}
else
{
Shape renderedGeometry;
if (feature.RenderedGeometry.TryGetValue(style, out var 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);
}
}
}
private static Canvas RenderLayerStatic(IViewport viewport, ILayer layer, SymbolCache symbolCache, bool rasterizing = false)
{
// todo:
// find solution for try catch. Sometimes this method will throw an exception
// when clearing and adding features to a layer while rendering
var canvas = new Canvas
{
Opacity = layer.Opacity,
IsHitTestVisible = false
};
try
{
var features = layer.GetFeaturesInView(viewport.Extent, viewport.Resolution).ToList();
var layerStyles = BaseLayer.GetLayerStyles(layer);
// If rasterizing (which is usually on a background thread) create a new SymbolCache
// just for this rendering because cross thread access is not allowed in WPF.
if (rasterizing)
{
symbolCache = new SymbolCache();
}
foreach (var layerStyle in layerStyles)
{
var style = layerStyle; // This is the default that could be overridden by an IThemeStyle
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;
}
RenderFeature(viewport, canvas, feature, style, symbolCache, rasterizing);
}
}
foreach (var feature in features)
{
var styles = feature.Styles ?? Enumerable.Empty <IStyle>();
foreach (var style in styles)
{
if (feature.Styles != null && style.Enabled)
{
RenderFeature(viewport, canvas, feature, style, symbolCache, rasterizing);
}
}
}
return(canvas);
}
catch (Exception ex)
{
Logger.Log(LogLevel.Error, "Unexpected error in xaml renderer", ex);
return(canvas);
// If exception happens inside RenderFeature function after
// at -least one child has been added to the canvas,
// returning new canvas will leave the previously created (but
// not yet added to parent canvas) canvas abandoned, that will
// cause the exception when resuing RenderedGeometry object, because
// at -least one RenderedGeometry was attached to that abandoned canvas.
// returning the same canvas will solve this error, as it will
// be clear this canvas childs on next render call.
// return new Canvas { IsHitTestVisible = false };
}
}
public static void RenderLayer(Canvas target, IViewport viewport, ILayer layer, SymbolCache symbolCache, bool rasterizing = false)
{
if (layer.Enabled == false)
{
return;
}
target.Children.Add(RenderLayerStatic(viewport, layer, symbolCache, rasterizing));
}
private static MemoryStream RenderToBitmapStreamStatic(IViewport viewport, IEnumerable <ILayer> layers, SymbolCache symbolCache)
{
var canvas = new Canvas();
Render(canvas, viewport, layers, symbolCache, true);
var bitmapStream = BitmapRendering.BitmapConverter.ToBitmapStream(canvas, (int)viewport.Width, (int)viewport.Height);
canvas.Children.Clear();
canvas.Dispatcher.InvokeShutdown();
return(bitmapStream);
}
private static BitmapImage GetOrCreateBitmapImage(Styles.Brush brush, SymbolCache symbolCache = null)
{
return(symbolCache != null?
symbolCache.GetOrCreate(brush.BitmapId) :
BitmapRegistry.Instance.Get(brush.BitmapId).ToBitmapImage());
}
