Expression CreateStroke(string stroke, string strokeWidth, string opacity, SvgRendererContext context)
{
Expression colorArgument;
if (stroke == null || stroke == "none")
{
return(null);
}
var alpha = opacity == null ? null : (int?)(((SvgLength)opacity).Value * 255);
if (stroke == "currentColor")
{
colorArgument = Expression.PropertyOrField(context.State, "CurrentColor");
if (alpha.HasValue)
{
var alphaArgument = Expression.Constant(alpha.Value);
colorArgument = Expression.Call(typeof(Color), "FromArgb", null, alphaArgument, colorArgument);
}
}
else
{
var color = ((SvgColor)stroke).Color;
if (alpha.HasValue)
{
color = Color.FromArgb(alpha.Value, color);
}
colorArgument = Expression.Constant(color);
}
var width = strokeWidth == null ? 1 : ((SvgLength)strokeWidth);
var widthArgument = Expression.Constant(width.Value);
return(Expression.Call(context.State, "StrokeStyle", null, colorArgument, widthArgument));
}
void CreateDrawChildren(SvgElement element, Matrix transform, SvgRendererContext context)
{
foreach (SvgElement child in element.Children)
{
CreateDrawBody(child, transform, context);
}
}
void CreateDrawEllipse(SvgElement element, Matrix transform, SvgRendererContext context)
{
var style = CreateStyle(element, context);
if (style != null)
{
var cx = ParseFloat(element, "cx");
var cy = ParseFloat(element, "cy");
var rx = ParseFloat(element, "rx");
var ry = ParseFloat(element, "ry");
var x = Expression.Constant(cx - rx);
var y = Expression.Constant(cy - ry);
var dx = Expression.Constant(2f * rx);
var dy = Expression.Constant(2f * ry);
CreateDrawTransform(element, transform, context);
if (style.Fill != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "FillEllipse", null, style.Fill, x, y, dx, dy));
}
if (style.Stroke != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "DrawEllipse", null, style.Stroke, x, y, dx, dy));
}
CreateResetTransform(context);
}
}
SvgRenderer CreateRenderer(SvgElement element)
{
var context = new SvgRendererContext();
CreateDrawBody(element, null, context);
var body = context.Expressions.Count > 0 ? (Expression)Expression.Block(context.Expressions) : Expression.Empty();
var renderer = Expression.Lambda <SvgRenderer>(body, context.State, context.Graphics);
return(renderer.Compile());
}
Expression CreateFill(SvgStyle style, SvgRendererContext context)
{
if (style == null)
{
return(CreateFill(null, null, context));
}
var fill = (string)style.Get("fill");
var opacity = (string)style.Get("fill-opacity");
return(CreateFill(fill, opacity, context));
}
void CreateDrawDefinitions(SvgElement element, SvgRendererContext context)
{
foreach (SvgElement child in element.Children)
{
switch (child.Name)
{
case "linearGradient": CreateLinearGradient(child, context); break;
default: continue;
}
}
}
Expression CreateStroke(SvgStyle style, SvgRendererContext context)
{
if (style == null)
{
return(null);
}
var stroke = (string)style.Get("stroke");
var strokeWidth = (string)style.Get("stroke-width");
var strokeOpacity = (string)style.Get("stroke-opacity");
return(CreateStroke(stroke, strokeWidth, strokeOpacity, context));
}
void CreateDrawTransform(SvgElement element, Matrix transform, SvgRendererContext context)
{
var localTransform = CreateTransform(element, transform);
var scale = Expression.PropertyOrField(context.State, "Scale");
var translation = Expression.PropertyOrField(context.State, "Translation");
var offsetX = Expression.PropertyOrField(translation, "X");
var offsetY = Expression.PropertyOrField(translation, "Y");
context.Expressions.Add(Expression.Call(context.Graphics, "TranslateTransform", null, offsetX, offsetY));
context.Expressions.Add(Expression.Call(context.Graphics, "ScaleTransform", null, scale, scale));
if (localTransform != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "MultiplyTransform", null, localTransform));
}
}
SvgDrawingStyle CreateStyle(SvgElement element, SvgRendererContext context)
{
Expression fill, stroke;
var style = GetElementStyle(element);
fill = CreateFill(style, context);
stroke = CreateStroke(style, context);
if (fill == null && stroke == null)
{
return(null);
}
else
{
return(new SvgDrawingStyle(fill, stroke));
}
}
void CreateLinearGradient(SvgElement element, SvgRendererContext context)
{
var linearGradient = element as SvgLinearGradientElement;
if (linearGradient != null)
{
var color1 = default(Color);
var color2 = default(Color);
LinearGradientBrush gradient;
if (linearGradient.Children.Count == 2)
{
var stop1 = linearGradient.Children[0] as SvgStopElement;
var stop2 = linearGradient.Children[1] as SvgStopElement;
if (stop1 != null && stop2 != null)
{
color1 = ParseStopColor(stop1);
color2 = ParseStopColor(stop2);
}
}
else
{
Brush referenceGradient;
LinearGradientBrush referenceLinearGradient;
var href = new SvgXRef(linearGradient).Href;
if (href != null && context.Gradients.TryGetValue(href, out referenceGradient) &&
(referenceLinearGradient = referenceGradient as LinearGradientBrush) != null)
{
color1 = referenceLinearGradient.LinearColors[0];
color2 = referenceLinearGradient.LinearColors[1];
}
}
var gradientTransform = ParseTransform(linearGradient, null, "gradientTransform");
var points = new[]
{
ParsePoint(linearGradient, "x1", "y1").GetValueOrDefault(PointF.Empty),
ParsePoint(linearGradient, "x2", "y2").GetValueOrDefault(new PointF(1, 1))
};
if (gradientTransform != null)
{
gradientTransform.TransformPoints(points);
}
gradient = new LinearGradientBrush(points[0], points[1], color1, color2);
context.Gradients.Add(new SvgUriReference(linearGradient).Href, gradient);
disposableResources.Add(gradient);
}
}
void CreateDrawPath(SvgElement element, Matrix transform, SvgRendererContext context)
{
var style = CreateStyle(element, context);
if (style != null)
{
var path = CreatePath(element, "d");
CreateDrawTransform(element, transform, context);
if (style.Fill != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "FillPath", null, style.Fill, path));
}
if (style.Stroke != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "DrawPath", null, style.Stroke, path));
}
CreateResetTransform(context);
}
}
void CreateDrawBody(SvgElement element, Matrix transform, SvgRendererContext context)
{
switch (element.Name)
{
case "rect": CreateDrawRectangle(element, transform, context); break;
case "circle": CreateDrawCircle(element, transform, context); break;
case "ellipse": CreateDrawEllipse(element, transform, context); break;
case "path": CreateDrawPath(element, transform, context); break;
case "svg": CreateDrawChildren(element, transform, context); break;
case "defs": CreateDrawDefinitions(element, context); break;
case "g":
var localTransform = ParseTransform(element, transform);
CreateDrawChildren(element, localTransform, context);
break;
}
}
void CreateDrawRectangle(SvgElement element, Matrix transform, SvgRendererContext context)
{
var style = CreateStyle(element, context);
if (style != null)
{
var x = CreateFloat(element, "x");
var y = CreateFloat(element, "y");
var width = CreateFloat(element, "width");
var height = CreateFloat(element, "height");
CreateDrawTransform(element, transform, context);
if (style.Fill != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "FillRectangle", null, style.Fill, x, y, width, height));
}
if (style.Stroke != null)
{
context.Expressions.Add(Expression.Call(context.Graphics, "DrawRectangle", null, style.Stroke, x, y, width, height));
}
CreateResetTransform(context);
}
}
Expression CreateFill(string fill, string opacity, SvgRendererContext context)
{
const string UrlPrefix = "url(";
if (fill == "none")
{
return(null);
}
if (fill == null)
{
return(Expression.Call(context.State, "FillStyle", null));
}
if (fill.StartsWith(UrlPrefix))
{
Brush brush;
var href = fill.Substring(UrlPrefix.Length, fill.Length - UrlPrefix.Length - 1);
if (!context.Gradients.TryGetValue(href, out brush))
{
return(null);
}
else
{
return(Expression.Constant(brush));
}
}
else
{
var color = ((SvgColor)fill).Color;
if (opacity != null)
{
var opacityValue = ((SvgLength)opacity).Value;
color = Color.FromArgb((int)(opacityValue * 255), color);
}
return(Expression.Call(context.State, "FillStyle", null, Expression.Constant(color)));
}
}
void CreateResetTransform(SvgRendererContext context)
{
context.Expressions.Add(Expression.Call(context.Graphics, "ResetTransform", null));
}