/// <summary>
/// Converts a LineString (list of Mapsui points) in world coordinates to a Skia path
/// </summary>
/// <param name="lineString">List of points in Mapsui world coordinates</param>
/// <param name="viewport">Viewport implementation</param>
/// <param name="clipRect">Rectangle to clip to. All lines outside aren't drawn.</param>
/// <returns></returns>
public static SKPath ToSkiaPath(this IEnumerable <Point> lineString, IReadOnlyViewport viewport, SKRect clipRect)
{
// First convert List<Points> to screen coordinates
var vertices = WorldToScreen(viewport, lineString);
var path = new SKPath();
SKPoint lastPoint = SKPoint.Empty;
for (var i = 1; i < vertices.Count; i++)
{
// Check each part of LineString, if it is inside or intersects the clipping rectangle
var intersect = LiangBarskyClip(vertices[i - 1], vertices[i], clipRect, out var intersectionPoint1, out var intersectionPoint2);
if (intersect != Intersection.CompleteOutside)
{
// If the last point isn't the same as actuall starting point ...
if (lastPoint.IsEmpty || !lastPoint.Equals(intersectionPoint1))
{
// ... than move to this point
path.MoveTo(intersectionPoint1);
}
// Draw line
path.LineTo(intersectionPoint2);
// Save last end point for later use
lastPoint = intersectionPoint2;
}
}
return(path);
}
public bool Draw(SKCanvas canvas, IReadOnlyViewport viewport, ILayer layer, IFeature feature, IStyle istyle,
ISymbolCache symbolCache)
{
var style = ((PolylineMarkerStyle)istyle);
var zoom = 1 / (float)viewport.Resolution;
//
var dest = viewport.WorldToScreen(style.start.X, style.start.Y);
canvas.Translate((float)dest.X, (float)dest.Y);
canvas.Scale(zoom, zoom);
canvas.RotateDegrees((float)viewport.Rotation, 0.0f, 0.0f);
//#TODO store paint with shader in the style
using (SKPaint paint = new SKPaint())
{
paint.Color = style.color;
paint.StrokeWidth = 3f * (float)viewport.Resolution;
paint.Style = SKPaintStyle.Stroke;
paint.IsAntialias = true;
canvas.DrawPath(style.path, paint);
}
return(true);
}
private static void Render(Canvas canvas, IReadOnlyViewport viewport, IEnumerable <ILayer> layers,
SymbolCache symbolCache, bool rasterizing)
{
canvas.BeginInit();
canvas.Visibility = Visibility.Hidden;
layers = layers.ToList();
foreach (var layer in layers)
{
if (!layer.Enabled)
{
continue;
}
if (layer.MinVisible > viewport.Resolution)
{
continue;
}
if (layer.MaxVisible < viewport.Resolution)
{
continue;
}
RenderLayer(canvas, viewport, layer, symbolCache, rasterizing);
}
canvas.Visibility = Visibility.Visible;
canvas.EndInit();
}
public bool Draw(SKCanvas canvas, IReadOnlyViewport viewport, ILayer layer, IFeature feature, IStyle style, ISymbolCache symbolCache, long iteration)
{
var symbolStyle = (SymbolStyle)style;
switch (feature)
{
case PointFeature pointFeature:
DrawXY(canvas, viewport, layer, pointFeature.Point.X, pointFeature.Point.Y, symbolStyle, symbolCache);
break;
case GeometryFeature geometryFeature:
switch (geometryFeature.Geometry)
{
case GeometryCollection collection:
foreach (var point in GetPoints(collection))
{
DrawXY(canvas, viewport, layer, point.X, point.Y, symbolStyle, symbolCache);
}
break;
case Point point:
DrawXY(canvas, viewport, layer, point.X, point.Y, symbolStyle, symbolCache);
break;
}
break;
}
return(true);
}
public void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IWidget widget, float layerOpacity)
{
var performanceWidget = (PerformanceWidget)widget;
_text[0] = performanceWidget.Performance.LastDrawingTime.ToString("0.000 ms");
_text[1] = performanceWidget.Performance.Mean.ToString("0.000 ms");
_text[2] = performanceWidget.Performance.FPS.ToString("0 fps");
_text[3] = performanceWidget.Performance.Min.ToString("0.000 ms");
_text[4] = performanceWidget.Performance.Max.ToString("0.000 ms");
_text[5] = performanceWidget.Performance.Count.ToString("0");
_text[6] = performanceWidget.Performance.Dropped.ToString("0");
var paint = _backgroundPaint;
paint.Color = _backgroundPaint.Color.WithAlpha((byte)(255.0f * performanceWidget.Opacity));
canvas.DrawRect(_rect, paint);
for (var i = 0; i < _textHeader.Length; i++)
{
canvas.DrawText(_textHeader[i], _rect.Left + 2, _rect.Top + 2 * i + _textSize * (i + 1), _textPaint);
canvas.DrawText(_text[i], _rect.Right - 2 - _textPaint.MeasureText(_text[i]), _rect.Top + (2 + _textSize) * (i + 1), _textPaint);
}
widget.Envelope = _envelope;
}
public bool Draw(SKCanvas canvas, IReadOnlyViewport viewport, ILayer layer, IFeature feature, IStyle style, ISymbolCache symbolCache)
{
if (!(feature.Geometry is global::Mapsui.Geometries.Point worldPoint))
{
return(false);
}
var screenPoint = viewport.WorldToScreen(worldPoint);
var color = new SKColor((byte)rnd.Next(0, 256), (byte)rnd.Next(0, 256), (byte)rnd.Next(0, 256), (byte)(256.0 * layer.Opacity * style.Opacity));
var colored = new SKPaint()
{
Color = color, IsAntialias = true
};
var black = new SKPaint()
{
Color = SKColors.Black, IsAntialias = true
};
canvas.Translate((float)screenPoint.X, (float)screenPoint.Y);
canvas.DrawCircle(0, 0, 15, colored);
canvas.DrawCircle(-8, -12, 8, colored);
canvas.DrawCircle(8, -12, 8, colored);
canvas.DrawCircle(8, -8, 2, black);
canvas.DrawCircle(-8, -8, 2, black);
using (var path = new SKPath())
{
path.ArcTo(new SKRect(-8, 2, 8, 10), 25, 135, true);
canvas.DrawPath(path, new SKPaint()
{
Style = SKPaintStyle.Stroke, Color = SKColors.Black, IsAntialias = true
});
}
return(true);
}
public static XamlShapes.Shape RenderPoint(Point point, IStyle style, IReadOnlyViewport viewport,
SymbolCache symbolCache)
{
XamlShapes.Shape symbol;
var matrix = XamlMedia.Matrix.Identity;
var symbolStyle = style as SymbolStyle;
if (symbolStyle != null)
{
if (symbolStyle.BitmapId < 0)
{
symbol = CreateSymbolFromVectorStyle(symbolStyle, symbolStyle.Opacity, symbolStyle.SymbolType, symbolCache, (float)viewport.Rotation);
}
else
{
symbol = CreateSymbolFromBitmap(symbolStyle.BitmapId, symbolStyle.Opacity, symbolCache);
}
matrix = CreatePointSymbolMatrix(viewport.Resolution, viewport.Rotation, symbolStyle, symbol.Width, symbol.Height);
}
else
{
symbol = CreateSymbolFromVectorStyle((style as VectorStyle) ?? new VectorStyle(), symbolCache: symbolCache, rotate: (float)viewport.Rotation);
MatrixHelper.ScaleAt(ref matrix, viewport.Resolution, viewport.Resolution);
}
MatrixHelper.Append(ref matrix, GeometryRenderer.CreateTransformMatrix(viewport, point));
symbol.RenderTransform = new XamlMedia.MatrixTransform {
Matrix = matrix
};
symbol.IsHitTestVisible = false;
return(symbol);
}
public MemoryStream RenderToBitmapStream(IReadOnlyViewport viewport, IEnumerable <ILayer> layers, Color background = null)
{
try
{
using (var surface = SKSurface.Create(
(int)viewport.Width, (int)viewport.Height, SKImageInfo.PlatformColorType, SKAlphaType.Unpremul))
{
if (surface == null)
{
return(null);
}
// Not sure if this is needed here:
if (background != null)
{
surface.Canvas.Clear(background.ToSkia(1));
}
Render(surface.Canvas, viewport, layers);
using (var image = surface.Snapshot())
{
using (var data = image.Encode())
{
var memoryStream = new MemoryStream();
data.SaveTo(memoryStream);
return(memoryStream);
}
}
}
}
catch (Exception ex)
{
Logger.Log(LogLevel.Error, ex.Message);
return(null);
}
}
/// <summary>
/// Convert a list of Mapsui points in world coordinates to SKPoint in screen coordinates
/// </summary>
/// <param name="viewport">Viewport implementation</param>
/// <param name="points">List of points in Mapsui world coordinates</param>
/// <returns>List of screen coordinates in SKPoint</returns>
private static List <SKPoint> WorldToScreen(IReadOnlyViewport viewport, IEnumerable <Point> points)
{
var result = new List <SKPoint>();
var screenCenterX = viewport.Width * 0.5;
var screenCenterY = viewport.Height * 0.5;
var centerX = viewport.Center.X;
var centerY = viewport.Center.Y;
var resolution = 1.0 / viewport.Resolution;
var rotation = viewport.Rotation / 180f * Math.PI;
var sin = Math.Sin(rotation);
var cos = Math.Cos(rotation);
foreach (var point in points)
{
var screenX = (point.X - centerX) * resolution;
var screenY = (centerY - point.Y) * resolution;
if (viewport.IsRotated)
{
var newX = screenX * cos - screenY * sin;
var newY = screenX * sin + screenY * cos;
screenX = newX;
screenY = newY;
}
screenX += screenCenterX;
screenY += screenCenterY;
result.Add(new SKPoint((float)screenX, (float)screenY));
}
return(result);
}
private static SKMatrix CreateRotationMatrix(IReadOnlyViewport viewport, MRect rect, SKMatrix priorMatrix)
{
// The front-end sets up the canvas with a matrix based on screen scaling (e.g. retina).
// We need to retain that effect by combining our matrix with the incoming matrix.
// We'll create four matrices in addition to the incoming matrix. They perform the
// zoom scale, focal point offset, user rotation and finally, centering in the screen.
var userRotation = SKMatrix.CreateRotationDegrees((float)viewport.Rotation);
var focalPointOffset = SKMatrix.CreateTranslation(
(float)(rect.Left - viewport.Center.X),
(float)(viewport.Center.Y - rect.Top));
var zoomScale = SKMatrix.CreateScale((float)(1.0 / viewport.Resolution), (float)(1.0 / viewport.Resolution));
var centerInScreen = SKMatrix.CreateTranslation((float)(viewport.Width / 2.0), (float)(viewport.Height / 2.0));
// We'll concatenate them like so: incomingMatrix * centerInScreen * userRotation * zoomScale * focalPointOffset
var matrix = SKMatrix.Concat(zoomScale, focalPointOffset);
matrix = SKMatrix.Concat(userRotation, matrix);
matrix = SKMatrix.Concat(centerInScreen, matrix);
matrix = SKMatrix.Concat(priorMatrix, matrix);
return(matrix);
}
private void RenderFeature(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature, float layerOpacity)
{
if (feature.Geometry is Point)
{
PointRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, _symbolCache, layerOpacity * style.Opacity);
}
else if (feature.Geometry is MultiPoint)
{
MultiPointRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, _symbolCache, layerOpacity * style.Opacity);
}
else if (feature.Geometry is LineString)
{
LineStringRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, layerOpacity * style.Opacity);
}
else if (feature.Geometry is MultiLineString)
{
MultiLineStringRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, layerOpacity * style.Opacity);
}
else if (feature.Geometry is Polygon)
{
PolygonRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, layerOpacity * style.Opacity, _symbolCache);
}
else if (feature.Geometry is MultiPolygon)
{
MultiPolygonRenderer.Draw(canvas, viewport, style, feature, feature.Geometry, layerOpacity * style.Opacity, _symbolCache);
}
else if (feature.Geometry is IRaster)
{
RasterRenderer.Draw(canvas, viewport, style, feature, layerOpacity * style.Opacity, _tileCache, _currentIteration);
}
}
private static Shape RenderGeometry(IReadOnlyViewport viewport, IStyle style, IFeature feature,
SymbolCache symbolCache)
{
if (feature.Geometry is Geometries.Point)
{
return(PointRenderer.RenderPoint(feature.Geometry as Geometries.Point, style, viewport, symbolCache));
}
if (feature.Geometry is MultiPoint)
{
return(GeometryRenderer.RenderMultiPoint(feature.Geometry as MultiPoint, style, viewport, symbolCache));
}
if (feature.Geometry is LineString)
{
return(LineStringRenderer.RenderLineString(feature.Geometry as LineString, style, viewport));
}
if (feature.Geometry is MultiLineString)
{
return(MultiLineStringRenderer.Render(feature.Geometry as MultiLineString, style, viewport));
}
if (feature.Geometry is Polygon)
{
return(PolygonRenderer.RenderPolygon(feature.Geometry as Polygon, style, viewport, symbolCache));
}
if (feature.Geometry is MultiPolygon)
{
return(MultiPolygonRenderer.RenderMultiPolygon(feature.Geometry as MultiPolygon, style, viewport, symbolCache));
}
if (feature.Geometry is IRaster)
{
return(GeometryRenderer.RenderRaster(feature.Geometry as IRaster, style, viewport));
}
return(null);
}
public MemoryStream RenderToBitmapStream(IReadOnlyViewport viewport, IEnumerable <ILayer> layers, Color background = null)
{
MemoryStream bitmapStream = null;
RunMethodOnStaThread(() => bitmapStream = RenderToBitmapStreamStatic(viewport, layers, _symbolCache));
return(bitmapStream);
}
/// <summary>
///
/// </summary>
/// <param name="layers">The layers to query for MapInfo</param>
/// <param name="viewport">The current Viewport</param>
/// <param name="screenPosition">The screenposition to query</param>
/// <param name="symbolCache">The </param>
/// <param name="margin">Margin of error in pixels. If the distance between screen position and geometry
/// is smaller than the margin it is seen as a hit.</param>
/// <returns></returns>
public static MapInfo GetMapInfo(IEnumerable <ILayer> layers, IReadOnlyViewport viewport, Point screenPosition,
ISymbolCache symbolCache, int margin = 0)
{
var worldPosition = viewport.ScreenToWorld(screenPosition);
return(GetMapInfo(layers, worldPosition, screenPosition, viewport.Resolution, symbolCache, margin));
}
public void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IWidget widget, float layerOpacity)
{
var hyperlink = (Hyperlink)widget;
if (string.IsNullOrEmpty(hyperlink.Text))
{
return;
}
using var textPaint = new SKPaint { Color = hyperlink.TextColor.ToSkia(layerOpacity), IsAntialias = true };
using var backPaint = new SKPaint { Color = hyperlink.BackColor.ToSkia(layerOpacity) };
// The textRect has an offset which can be confusing.
// This is because DrawText's origin is the baseline of the text, not the bottom.
// Read more here: https://developer.xamarin.com/guides/xamarin-forms/advanced/skiasharp/basics/text/
var textRect = new SKRect();
textPaint.MeasureText(hyperlink.Text, ref textRect);
// The backRect is straight forward. It is leading for our purpose.
var backRect = new SKRect(0, 0,
textRect.Width + hyperlink.PaddingX * 2,
textPaint.TextSize + hyperlink.PaddingY * 2); // Use the font's TextSize for consistency
var offsetX = GetOffsetX(backRect.Width, hyperlink.MarginX, hyperlink.HorizontalAlignment, viewport.Width);
var offsetY = GetOffsetY(backRect.Height, hyperlink.MarginY, hyperlink.VerticalAlignment, viewport.Height);
backRect.Offset(offsetX, offsetY);
canvas.DrawRoundRect(backRect, hyperlink.CornerRadius, hyperlink.CornerRadius, backPaint);
hyperlink.Envelope = backRect.ToMRect();
// To position the text within the backRect correct using the textRect's offset.
canvas.DrawText(hyperlink.Text,
offsetX - textRect.Left + hyperlink.PaddingX,
offsetY - textRect.Top + hyperlink.PaddingY, textPaint);
}
private static void PositionGeometry(Shape renderedGeometry, IReadOnlyViewport viewport, IStyle style, IFeature feature)
{
if (feature.Geometry is Geometries.Point)
{
PointRenderer.PositionPoint(renderedGeometry, feature.Geometry as Geometries.Point, style, viewport);
}
else if (feature.Geometry is MultiPoint)
{
GeometryRenderer.PositionGeometry(renderedGeometry, viewport);
}
else if (feature.Geometry is LineString)
{
GeometryRenderer.PositionGeometry(renderedGeometry, viewport);
}
else if (feature.Geometry is MultiLineString)
{
GeometryRenderer.PositionGeometry(renderedGeometry, viewport);
}
else if (feature.Geometry is Polygon)
{
GeometryRenderer.PositionGeometry(renderedGeometry, viewport);
}
else if (feature.Geometry is MultiPolygon)
{
GeometryRenderer.PositionGeometry(renderedGeometry, viewport);
}
else if (feature.Geometry is IRaster)
{
GeometryRenderer.PositionRaster(renderedGeometry, feature.Geometry.BoundingBox, viewport);
}
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature,
IGeometry geometry, SymbolCache symbolCache, float opacity)
{
var point = geometry as Point;
var destination = viewport.WorldToScreen(point);
if (style is LabelStyle labelStyle) // case 1) LabelStyle
{
LabelRenderer.Draw(canvas, labelStyle, feature, (float)destination.X, (float)destination.Y,
opacity);
}
else if (style is SymbolStyle)
{
var symbolStyle = (SymbolStyle)style;
if (symbolStyle.BitmapId >= 0) // case 2) Bitmap Style
{
DrawPointWithBitmapStyle(canvas, symbolStyle, destination, symbolCache, opacity, (float)viewport.Rotation);
}
else // case 3) SymbolStyle without bitmap
{
DrawPointWithSymbolStyle(canvas, symbolStyle, destination, opacity, symbolStyle.SymbolType, (float)viewport.Rotation);
}
}
else if (style is VectorStyle) // case 4) VectorStyle
{
DrawPointWithVectorStyle(canvas, (VectorStyle)style, destination, opacity);
}
else
{
throw new Exception($"Style of type '{style.GetType()}' is not supported for points");
}
}
public void Render(object target, IReadOnlyViewport viewport, IEnumerable <ILayer> layers,
IEnumerable <IWidget> widgets, Color background = null)
{
var allWidgets = layers.Select(l => l.Attribution).ToList().Where(w => w != null).Concat(widgets).ToList();
RenderTypeSave((Canvas)target, viewport, layers, allWidgets, background);
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature, IGeometry geometry,
float opacity)
{
if (style is LabelStyle labelStyle)
{
var worldCenter = geometry.BoundingBox.Centroid;
var center = viewport.WorldToScreen(worldCenter);
LabelRenderer.Draw(canvas, labelStyle, feature, center, opacity);
}
else
{
var lineString = ((LineString)geometry).Vertices;
float lineWidth = 1;
var lineColor = new Color();
var vectorStyle = style as VectorStyle;
var strokeCap = PenStrokeCap.Butt;
var strokeJoin = StrokeJoin.Miter;
var strokeMiterLimit = 4f;
var strokeStyle = PenStyle.Solid;
float[] dashArray = null;
float dashOffset = 0;
if (vectorStyle != null)
{
lineWidth = (float)vectorStyle.Line.Width;
lineColor = vectorStyle.Line.Color;
strokeCap = vectorStyle.Line.PenStrokeCap;
strokeJoin = vectorStyle.Line.StrokeJoin;
strokeMiterLimit = vectorStyle.Line.StrokeMiterLimit;
strokeStyle = vectorStyle.Line.PenStyle;
dashArray = vectorStyle.Line.DashArray;
dashOffset = vectorStyle.Line.DashOffset;
}
using (var path = lineString.ToSkiaPath(viewport, canvas.LocalClipBounds))
using (var paint = new SKPaint {
IsAntialias = true
})
{
paint.IsStroke = true;
paint.StrokeWidth = lineWidth;
paint.Color = lineColor.ToSkia(opacity);
paint.StrokeCap = strokeCap.ToSkia();
paint.StrokeJoin = strokeJoin.ToSkia();
paint.StrokeMiter = strokeMiterLimit;
if (strokeStyle != PenStyle.Solid)
{
paint.PathEffect = strokeStyle.ToSkia(lineWidth, dashArray, dashOffset);
}
else
{
paint.PathEffect = null;
}
canvas.DrawPath(path, paint);
}
}
}
/// <summary>
/// Converts a LineString (list of Mapsui points) in world coordinates to a Skia path
/// </summary>
/// <param name="lineString">List of points in Mapsui world coordinates</param>
/// <param name="viewport">Viewport implementation</param>
/// <param name="clipRect">Rectangle to clip to. All lines outside aren't drawn.</param>
/// <returns></returns>
public static SKPath ToSkiaPath(this IEnumerable <Point> lineString, IReadOnlyViewport viewport, SKRect clipRect)
{
// First convert List<Points> to screen coordinates
var vertices = WorldToScreen(viewport, lineString);
var path = new SKPath();
SKPoint lastPoint = SKPoint.Empty;
// Calculate step size in which we iterate the list of vertices
var simplificationStep = 1;
if (EnableAutoSimplification && (vertices.Count > 50))
{
simplificationStep = (int)Math.Max(viewport.Resolution / 5.0, 1.0);
if ((double)vertices.Count / (double)simplificationStep < 4.0)
{
// Iterate at least in 4 steps through vertices list
simplificationStep = (int)Math.Round(vertices.Count / 4.0);
}
}
var lastRunPassed = false;
var lastIndex = 0;
for (var i = simplificationStep; !lastRunPassed; i += simplificationStep)
{
// Ensure that we render the last point of the line
if (i >= vertices.Count)
{
if (lastIndex == (vertices.Count - 1))
{
break;
}
lastRunPassed = true;
i = vertices.Count - 1;
}
lastIndex = i;
// Check each part of LineString, if it is inside or intersects the clipping rectangle
var intersect = LiangBarskyClip(vertices[i - simplificationStep], vertices[i], clipRect, out var intersectionPoint1, out var intersectionPoint2);
if (intersect != Intersection.CompleteOutside)
{
// If the last point isn't the same as actuall starting point ...
if (lastPoint.IsEmpty || !lastPoint.Equals(intersectionPoint1))
{
// ... than move to this point
path.MoveTo(intersectionPoint1);
}
// Draw line
path.LineTo(intersectionPoint2);
// Save last end point for later use
lastPoint = intersectionPoint2;
}
}
return(path);
}
public static XamlShapes.Path RenderRaster(IRaster raster, IStyle style, IReadOnlyViewport viewport)
{
var path = CreateRasterPath(style, raster.Data);
path.Data = new XamlMedia.RectangleGeometry();
PositionRaster(path, raster.BoundingBox, viewport);
return(path);
}
public static bool DrawSymbol(SKCanvas canvas, IReadOnlyViewport viewport, ILayer layer, double x, double y, SymbolStyle symbolStyle)
{
var opacity = (float)(layer.Opacity * symbolStyle.Opacity);
var(destX, destY) = viewport.WorldToScreenXY(x, y);
canvas.Save();
canvas.Translate((float)destX, (float)destY);
canvas.Scale((float)symbolStyle.SymbolScale, (float)symbolStyle.SymbolScale);
if (symbolStyle.SymbolOffset.IsRelative)
{
canvas.Translate((float)(SymbolStyle.DefaultWidth * symbolStyle.SymbolOffset.X), (float)(-SymbolStyle.DefaultWidth * symbolStyle.SymbolOffset.Y));
}
else
{
canvas.Translate((float)symbolStyle.SymbolOffset.X, (float)-symbolStyle.SymbolOffset.Y);
}
if (symbolStyle.SymbolRotation != 0)
{
var rotation = symbolStyle.SymbolRotation;
if (symbolStyle.RotateWithMap)
{
rotation += viewport.Rotation;
}
canvas.RotateDegrees((float)rotation);
}
var width = (float)SymbolStyle.DefaultWidth;
var halfWidth = width / 2;
var halfHeight = (float)SymbolStyle.DefaultHeight / 2;
using var fillPaint = CreateFillPaint(symbolStyle.Fill, opacity);
using var linePaint = CreateLinePaint(symbolStyle.Outline, opacity);
switch (symbolStyle.SymbolType)
{
case SymbolType.Ellipse:
DrawCircle(canvas, 0, 0, halfWidth, fillPaint, linePaint);
break;
case SymbolType.Rectangle:
var rect = new SKRect(-halfWidth, -halfHeight, halfWidth, halfHeight);
DrawRect(canvas, rect, fillPaint, linePaint);
break;
case SymbolType.Triangle:
DrawTriangle(canvas, 0, 0, width, fillPaint, linePaint);
break;
default: // Invalid value
throw new ArgumentOutOfRangeException();
}
canvas.Restore();
return(true);
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature,
MultiLineString multiLineString, float opacity)
{
foreach (var geometry in multiLineString.Geometries)
{
var lineString = (LineString)geometry;
LineStringRenderer.Draw(canvas, viewport, style, feature, lineString, opacity);
}
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature,
MultiPolygon multiPolygon, float opacity, SymbolCache?symbolCache = null)
{
foreach (var geometry in multiPolygon.Geometries)
{
var polygon = (Polygon)geometry;
PolygonRenderer.Draw(canvas, viewport, style, feature, polygon, opacity, symbolCache);
}
}
public static void RenderLayer(Canvas target, IReadOnlyViewport viewport, ILayer layer, SymbolCache symbolCache, bool rasterizing = false)
{
if (layer.Enabled == false)
{
return;
}
target.Children.Add(RenderLayerStatic(viewport, layer, symbolCache, rasterizing));
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature,
MultiPoint multiPoint, SymbolCache symbolCache, float opacity)
{
foreach (var geometry in multiPoint)
{
var point = (Point)geometry;
PointRenderer.Draw(canvas, viewport, style, feature, point.X, point.Y, symbolCache, opacity);
}
}
public static void Render(object target, IReadOnlyViewport viewport, IEnumerable <IWidget> widgets,
IDictionary <Type, IWidgetRenderer> renders, float layerOpacity)
{
var canvas = (SKCanvas)target;
foreach (var widget in widgets)
{
((ISkiaWidgetRenderer)renders[widget.GetType()]).Draw(canvas, viewport, widget, layerOpacity);
}
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport, IStyle style, IFeature feature, IGeometry geometry,
float opacity, SymbolCache symbolCache = null)
{
var multiPolygon = (MultiPolygon)geometry;
foreach (var polygon in multiPolygon)
{
PolygonRenderer.Draw(canvas, viewport, style, feature, polygon, opacity, symbolCache);
}
}
public static void Draw(SKCanvas canvas, IReadOnlyViewport viewport,
float opacity, Point destination, CalloutStyle calloutStyle)
{
if (calloutStyle.BitmapId < 0 || calloutStyle.Invalidated)
{
if (calloutStyle.Content < 0 && calloutStyle.Type == CalloutType.Custom)
{
return;
}
if (calloutStyle.Invalidated)
{
UpdateContent(calloutStyle);
}
RenderCallout(calloutStyle);
}
// Now we have the complete callout rendered, so we could draw it
if (calloutStyle.BitmapId < 0)
{
return;
}
var picture = (SKPicture)BitmapRegistry.Instance.Get(calloutStyle.BitmapId);
// Calc offset (relative or absolute)
var symbolOffsetX = calloutStyle.SymbolOffset.IsRelative ? picture.CullRect.Width * (float)calloutStyle.SymbolOffset.X : (float)calloutStyle.SymbolOffset.X;
var symbolOffsetY = calloutStyle.SymbolOffset.IsRelative ? picture.CullRect.Height * (float)calloutStyle.SymbolOffset.Y : (float)calloutStyle.SymbolOffset.Y;
var rotation = (float)calloutStyle.SymbolRotation;
if (calloutStyle.RotateWithMap)
{
rotation += (float)viewport.Rotation;
}
// Save state of the canvas, so we could move and rotate the canvas
canvas.Save();
// Move 0/0 to the Anchor point of Callout
canvas.Translate((float)destination.X - symbolOffsetX, (float)destination.Y - symbolOffsetY);
canvas.Scale((float)calloutStyle.SymbolScale, (float)calloutStyle.SymbolScale);
// 0/0 are assumed at center of image, but Picture has 0/0 at left top position
canvas.RotateDegrees(rotation);
canvas.Translate((float)calloutStyle.Offset.X, (float)calloutStyle.Offset.Y);
canvas.DrawPicture(picture, new SKPaint()
{
IsAntialias = true
});
canvas.Restore();
}
/// <summary>
/// Converts a Polygon into a SKPath, that is clipped to cliptRect, where exterior is bigger than interior
/// </summary>
/// <param name="polygon">Polygon to convert</param>
/// <param name="viewport">Viewport implementation</param>
/// <param name="clipRect">Rectangle to clip to. All lines outside aren't drawn.</param>
/// <param name="strokeWidth">StrokeWidth for inflating cliptRect</param>
/// <returns></returns>
public static SKPath ToSkiaPath(this Polygon polygon, IReadOnlyViewport viewport, SKRect clipRect, float strokeWidth)
{
// Reduce exterior ring to parts, that are visible in clipping rectangle
// Inflate clipRect, so that we could be sure, nothing of stroke is visible on screen
var exterior = ReducePointsToClipRect(polygon.ExteriorRing.Vertices, viewport, SKRect.Inflate(clipRect, strokeWidth * 2, strokeWidth * 2));
// Create path for exterior and interior parts
var path = new SKPath();
if (exterior.Count == 0)
{
return(path);
}
// Draw exterior path
path.MoveTo(exterior[0]);
for (var i = 1; i < exterior.Count; i++)
{
path.LineTo(exterior[i]);
}
// Close exterior path
path.Close();
foreach (var interiorRing in polygon.InteriorRings)
{
// note: For Skia inner rings need to be clockwise and outer rings
// need to be counter clockwise (if this is the other way around it also
// seems to work)
// this is not a requirement of the OGC polygon.
// Reduce interior ring to parts, that are visible in clipping rectangle
var interior = ReducePointsToClipRect(interiorRing.Vertices, viewport, SKRect.Inflate(clipRect, strokeWidth, strokeWidth));
if (interior.Count == 0)
{
continue;
}
// Draw interior pathes
path.MoveTo(interior[0]);
for (var i = 1; i < interior.Count; i++)
{
path.LineTo(interior[i]);
}
}
// Close interior pathes
path.Close();
return(path);
}
