private static CALayer RenderImage(MultiPolygon multiPolygon, IStyle style, IViewport viewport)
{
var geom = new CAShapeLayer();
if (!(style is VectorStyle))
{
throw new ArgumentException("Style is not of type VectorStyle");
}
var vectorStyle = style as VectorStyle;
float strokeAlpha = (float)vectorStyle.Outline.Color.A / 255;
float fillAlpha = (float)vectorStyle.Fill.Color.A / 255;
var strokeColor = new CGColor(new CGColor(vectorStyle.Outline.Color.R, vectorStyle.Outline.Color.G,
vectorStyle.Outline.Color.B), strokeAlpha);
var fillColor = new CGColor(new CGColor(vectorStyle.Fill.Color.R, vectorStyle.Fill.Color.G,
vectorStyle.Fill.Color.B), fillAlpha);
geom.StrokeColor = strokeColor;
geom.FillColor = fillColor;
geom.LineWidth = (float)vectorStyle.Outline.Width;
var bbRect = GeometryRenderer.ConvertBoundingBox(multiPolygon.GetBoundingBox(), viewport);
var offset = new System.Drawing.Point((int)bbRect.GetMinX(), (int)bbRect.GetMinY());
GeometryExtension.OffSet = offset;
var path = multiPolygon.ToUIKit(viewport);
var frame = new RectangleF(0, 0, (int)(bbRect.GetMaxX() - bbRect.GetMinX()), (int)(bbRect.GetMaxY() - bbRect.GetMinY()));
var size = frame.Size;
geom.Path = path.CGPath;
UIGraphics.BeginImageContext(size);
var context = UIGraphics.GetCurrentContext();
context.SetBlendMode(CGBlendMode.Multiply);
geom.RenderInContext(context);
var image = UIGraphics.GetImageFromCurrentImageContext();
var imageTile = new CALayer {
Contents = image.CGImage, Frame = frame
};
return(imageTile);
}
private static void RenderGeometry(CALayer target, IViewport viewport, IStyle style, IFeature feature)
{
if (feature.Geometry is Point)
{
PointRenderer2.RenderPoint(target, (Point)feature.Geometry, style, viewport, feature);
}
else if (feature.Geometry is LineString)
{
LineStringRenderer.Draw(target, viewport, style, feature);
}
else if (feature.Geometry is Polygon)
{
GeometryRenderer.RenderPolygonOnLayer(feature.Geometry as Polygon, style, viewport);
}
else if (feature.Geometry is MultiPolygon)
{
GeometryRenderer.RenderMultiPolygonOnLayer(feature.Geometry as MultiPolygon, style, viewport);
}
else if (feature.Geometry is IRaster)
{
RasterRenderer.Draw(target, viewport, style, feature);
}
}