public object Clone()
{
var units = new SvgUnitCollection
{
StringForEmptyValue = StringForEmptyValue
};
units.AddRange(this);
return(units);
}
/// <summary>
/// Renders the stroke of the <see cref="SvgVisualElement"/> to the specified <see cref="ISvgRenderer"/>
/// </summary>
/// <param name="renderer">The <see cref="ISvgRenderer"/> object to render to.</param>
protected internal virtual bool RenderStroke(ISvgRenderer renderer)
{
if (Stroke != null && Stroke != SvgPaintServer.None && StrokeWidth > 0f)
{
var strokeWidth = StrokeWidth.ToDeviceValue(renderer, UnitRenderingType.Other, this);
using (var brush = Stroke.GetBrush(this, renderer, FixOpacityValue(StrokeOpacity), true))
{
if (brush != null)
{
var path = Path(renderer);
var bounds = path.GetBounds();
if (path.PointCount < 1)
{
return(false);
}
if (bounds.Width <= 0f && bounds.Height <= 0f)
{
switch (StrokeLineCap)
{
case SvgStrokeLineCap.Round:
using (var capPath = new GraphicsPath())
{
capPath.AddEllipse(path.PathPoints[0].X - strokeWidth / 2f, path.PathPoints[0].Y - strokeWidth / 2f, strokeWidth, strokeWidth);
renderer.FillPath(brush, capPath);
}
break;
case SvgStrokeLineCap.Square:
using (var capPath = new GraphicsPath())
{
capPath.AddRectangle(new RectangleF(path.PathPoints[0].X - strokeWidth / 2f, path.PathPoints[0].Y - strokeWidth / 2f, strokeWidth, strokeWidth));
renderer.FillPath(brush, capPath);
}
break;
}
}
else
{
using (var pen = new Pen(brush, strokeWidth))
{
if (StrokeDashArray != null && StrokeDashArray.Count > 0)
{
var strokeDashArray = StrokeDashArray;
if (strokeDashArray.Count % 2 != 0)
{
// handle odd dash arrays by repeating them once
strokeDashArray = new SvgUnitCollection();
strokeDashArray.AddRange(StrokeDashArray);
strokeDashArray.AddRange(StrokeDashArray);
}
var dashOffset = StrokeDashOffset;
strokeWidth = Math.Max(strokeWidth, 1f);
/* divide by stroke width - GDI uses stroke width as unit.*/
var dashPattern = strokeDashArray.Select(u => ((u.ToDeviceValue(renderer, UnitRenderingType.Other, this) <= 0f) ? 1f :
u.ToDeviceValue(renderer, UnitRenderingType.Other, this)) / strokeWidth).ToArray();
var length = dashPattern.Length;
if (StrokeLineCap == SvgStrokeLineCap.Round)
{
// to handle round caps, we have to adapt the dash pattern
// by increasing the dash length by the stroke width - GDI draws the rounded
// edge inside the dash line, SVG draws it outside the line
var pattern = new float[length];
var offset = 1; // the values are already normalized to dash width
for (var i = 0; i < length; i++)
{
pattern[i] = dashPattern[i] + offset;
if (pattern[i] <= 0f)
{
// overlapping caps - remove the gap for simplicity, see #508
if (i < length - 1)
{
// add the next dash segment to the current one
dashPattern[i - 1] += dashPattern[i] + dashPattern[i + 1];
length -= 2;
for (var k = i; k < length; k++)
{
dashPattern[k] = dashPattern[k + 2];
}
// and handle the combined segment again
i -= 2;
}
else if (i > 2)
{
// add the last dash segment to the first one
// this will change the start point, so adapt the offset
var dashLength = dashPattern[i - 1] + dashPattern[i];
pattern[0] += dashLength;
length -= 2;
dashOffset += dashLength * strokeWidth;
}
else
{
// we have only one dash with the gap too small -
// do not use dash at all
length = 0;
break;
}
}
offset *= -1; // increase dash length, decrease spaces
}
if (length > 0)
{
if (length < dashPattern.Length)
{
Array.Resize(ref pattern, length);
}
dashPattern = pattern;
pen.DashCap = DashCap.Round;
}
}
if (length > 0)
{
pen.DashPattern = dashPattern;
if (dashOffset != 0f)
{
pen.DashOffset = ((dashOffset.ToDeviceValue(renderer, UnitRenderingType.Other, this) <= 0f) ? 1f :
dashOffset.ToDeviceValue(renderer, UnitRenderingType.Other, this)) / strokeWidth;
}
}
}
switch (StrokeLineJoin)
{
case SvgStrokeLineJoin.Bevel:
pen.LineJoin = LineJoin.Bevel;
break;
case SvgStrokeLineJoin.Round:
pen.LineJoin = LineJoin.Round;
break;
default:
pen.LineJoin = LineJoin.Miter;
break;
}
pen.MiterLimit = StrokeMiterLimit;
switch (StrokeLineCap)
{
case SvgStrokeLineCap.Round:
pen.StartCap = LineCap.Round;
pen.EndCap = LineCap.Round;
break;
case SvgStrokeLineCap.Square:
pen.StartCap = LineCap.Square;
pen.EndCap = LineCap.Square;
break;
}
renderer.DrawPath(pen, path);
return(true);
}
}
}
}
}
return(false);
}