/// <summary>
/// When a GDI instruction with a brush parameter is called, there can be a lot we have to do to emulate the brush. The aim is to return a
/// style that represents the brush.
/// <para>
/// Solid brush is very easy.
/// </para>
/// <para>
/// Linear grad brush: we ignore the blend curve and the transformation (and therefore the rotation parameter if any)
/// Hatch brush:
/// </para>
/// <para>
/// Other types of brushes are too hard to emulate and are rendered pink.
/// </para>
/// </summary>
/// <param name="br"></param>
/// <returns></returns>
private SvgStyle HandleBrush(Brush br)
{
if (br.GetType() == typeof(SolidBrush))
{
return new SvgStyle((SolidBrush)br);
}
if (br.GetType() == typeof(LinearGradientBrush))
{
LinearGradientBrush grbr = (LinearGradientBrush)br;
RectangleF rc = grbr.Rectangle;
SvgLinearGradient grad = new SvgLinearGradient(rc.Left, rc.Top, rc.Right, rc.Bottom);
switch(grbr.WrapMode)
{
//I have not been able to test Clamp because using a clamped gradient appears to crash the process
//under XP (?!?!)
case WrapMode.Clamp:
grad.SpreadMethod = "pad"; grad.GradientUnits = "objectBoundingBox"; break;
case WrapMode.Tile:
grad.SpreadMethod = "repeat"; grad.GradientUnits = "userSpaceOnUse"; break;
default:
grad.SpreadMethod = "reflect"; grad.GradientUnits = "userSpaceOnUse"; break;
}
ColorBlend cb = null;
//GDI dll tends to crash when you try and access some members of gradient brushes that haven't been specified.
try
{
cb = grbr.InterpolationColors;
}
catch(Exception){}
if(cb != null)
{
for(int i = 0; i < grbr.InterpolationColors.Colors.Length; ++i)
{
grad.AddChild(new SvgStopElement(grbr.InterpolationColors.Positions[i], grbr.InterpolationColors.Colors[i]));
}
}
else
{
grad.AddChild(new SvgStopElement("0%", grbr.LinearColors[0]));
grad.AddChild(new SvgStopElement("100%", grbr.LinearColors[1]));
}
grad.Id += "_LinearGradientBrush";
_defs.AddChild(grad);
SvgStyle s = new SvgStyle();
s.Set("fill", new SvgUriReference(grad));
return s;
}
if (br.GetType() == typeof(HatchBrush))
{
HatchBrush habr = (HatchBrush)br;
SvgPatternElement patty = new SvgPatternElement(0,0,8,8, new SvgNumList("4 4 12 12"));
patty.Style.Set("shape-rendering", "crispEdges");
patty.Style.Set("stroke-linecap", "butt");
SvgRectElement rc = new SvgRectElement(0,0,8,8);
rc.Style.Set("fill", new SvgColor(habr.BackgroundColor));
patty.AddChild(rc);
AddHatchBrushDetails(patty, new SvgColor(habr.ForegroundColor), habr.HatchStyle);
patty.Id += "_HatchBrush";
patty.PatternUnits = "userSpaceOnUse";
patty.PatternContentUnits = "userSpaceOnUse";
_defs.AddChild(patty);
SvgStyle s = new SvgStyle();
s.Set("fill", new SvgUriReference(patty));
return s;
}
//most types of brush we can't emulate, but luckily they are quite unusual
return new SvgStyle(new SolidBrush(Color.Salmon));
}
private void AddHatchBrushDetails(SvgPatternElement patty, SvgColor col, HatchStyle hs)
{
SvgStyledTransformedElement l1=null;
SvgStyledTransformedElement l2 = null;
SvgStyledTransformedElement l3 = null;
SvgStyledTransformedElement l4 = null;
switch(hs)
{
case HatchStyle.Cross:
l1 = new SvgLineElement(4,0,4,8);
l2 = new SvgLineElement(0,4,8,4);
break;
case HatchStyle.BackwardDiagonal:
l1 = new SvgLineElement(8,0,0,8);
break;
case HatchStyle.LightDownwardDiagonal:
case HatchStyle.DarkDownwardDiagonal:
l1 = new SvgLineElement(4,0,8,4);
l2 = new SvgLineElement(0,4,4,8);
l3 = new SvgLineElement(0,0,8,8);
break;
case HatchStyle.LightHorizontal:
case HatchStyle.DarkHorizontal:
l1 = new SvgLineElement(0,2,8,2);
l2 = new SvgLineElement(0,6,8,6);
break;
case HatchStyle.LightUpwardDiagonal:
case HatchStyle.DarkUpwardDiagonal:
l1 = new SvgLineElement(0,4,4,0);
l2 = new SvgLineElement(4,8,8,4);
l3 = new SvgLineElement(0,8,8,0);
break;
case HatchStyle.LightVertical:
case HatchStyle.DarkVertical:
l1 = new SvgLineElement(2,0,2,8);
l2 = new SvgLineElement(6,0,6,8);
break;
case HatchStyle.DashedDownwardDiagonal:
l1 = new SvgLineElement(0,0,4,4);
l2 = new SvgLineElement(4,0,8,4);
break;
case HatchStyle.DashedHorizontal:
l1 = new SvgLineElement(0,2,4,2);
l2 = new SvgLineElement(4,6,8,6);
break;
case HatchStyle.DashedUpwardDiagonal:
l1 = new SvgLineElement(4,0,0,4);
l2 = new SvgLineElement(8,0,4,4);
break;
case HatchStyle.DashedVertical:
l1 = new SvgLineElement(2,0,2,4);
l2 = new SvgLineElement(6,4,6,8);
break;
case HatchStyle.DiagonalBrick:
l1 = new SvgLineElement(0,8,8,0);
l2 = new SvgLineElement(0,0,4,4);
break;
case HatchStyle.DiagonalCross:
l1 = new SvgLineElement(0,0,8,8);
l2 = new SvgLineElement(8,0,0,8);
break;
case HatchStyle.Divot:
l1 = new SvgLineElement(2,2,4,4);
l2 = new SvgLineElement(4,4,2,6);
break;
case HatchStyle.DottedDiamond:
l1 = new SvgLineElement(0,0,8,8);
l2 = new SvgLineElement(0,8,8,0);
break;
case HatchStyle.DottedGrid:
l1 = new SvgLineElement(4,0,4,8);
l2 = new SvgLineElement(0,4,8,4);
break;
case HatchStyle.ForwardDiagonal:
l1 = new SvgLineElement(0,0,8,8);
break;
case HatchStyle.Horizontal:
l1 = new SvgLineElement(0,4,8,4);
break;
case HatchStyle.HorizontalBrick:
l1 = new SvgLineElement(0,3,8,3);
l2 = new SvgLineElement(3,0,3,3);
l3 = new SvgLineElement(0,3,0,7);
l4 = new SvgLineElement(0,7,7,7);
break;
case HatchStyle.LargeCheckerBoard:
l1 = new SvgRectElement(0,0,3f,3f);
l2 = new SvgRectElement(4,4,4,4f);
break;
case HatchStyle.LargeConfetti:
l1 = new SvgRectElement(0,0,1,1);
l2 = new SvgRectElement(2,3,1,1);
l3 = new SvgRectElement(5,2,1,1);
l4 = new SvgRectElement(6,6,1,1);
break;
case HatchStyle.NarrowHorizontal:
l1 = new SvgLineElement(0,1,8,1);
l2 = new SvgLineElement(0,3,8,3);
l3 = new SvgLineElement(0,5,8,5);
l4 = new SvgLineElement(0,7,8,7);
break;
case HatchStyle.NarrowVertical:
l1 = new SvgLineElement(1,0,1,8);
l2 = new SvgLineElement(3,0,3,8);
l3 = new SvgLineElement(5,0,5,8);
l4 = new SvgLineElement(7,0,7,8);
break;
case HatchStyle.OutlinedDiamond:
l1 = new SvgLineElement(0,0,8,8);
l2 = new SvgLineElement(8,0,0,8);
break;
case HatchStyle.Plaid:
l1 = new SvgLineElement(0,0,8,0);
l2 = new SvgLineElement(0,3,8,3);
l3 = new SvgRectElement(0,4,3,3);
break;
case HatchStyle.Shingle:
l1 = new SvgLineElement(0,2,2,0);
l2 = new SvgLineElement(2,0,7,5);
l3 = new SvgLineElement(0,3,3,7);
break;
case HatchStyle.SmallCheckerBoard:
l1 = new SvgRectElement(0,0,1,1);
l2 = new SvgRectElement(4,4,1,1);
l3 = new SvgRectElement(4,0,1,1);
l4 = new SvgRectElement(0,4,1,1);
break;
case HatchStyle.SmallConfetti:
l1 = new SvgLineElement(0,0,2,2);
l2 = new SvgLineElement(7,3,5,5);
l3 = new SvgLineElement(2,6,4,4);
break;
case HatchStyle.SmallGrid:
l1 = new SvgLineElement(0,2,8,2);
l2 = new SvgLineElement(0,6,8,6);
l3 = new SvgLineElement(2,0,2,8);
l4 = new SvgLineElement(6,0,6,8);
break;
case HatchStyle.SolidDiamond:
l1 = new SvgPolygonElement("3 0 6 3 3 6 0 3");
break;
case HatchStyle.Sphere:
l1 = new SvgEllipseElement(3,3,2,2);
break;
case HatchStyle.Trellis:
l1 = new SvgLineElement(0,1,8,1);
l2 = new SvgLineElement(0,3,8,3);
l3 = new SvgLineElement(0,5,8,5);
l4 = new SvgLineElement(0,7,8,7);
break;
case HatchStyle.Vertical:
l4 = new SvgLineElement(0,0,0,8);
break;
case HatchStyle.Wave:
l3 = new SvgLineElement(0,4,3,2);
l4 = new SvgLineElement(3,2,8,4);
break;
case HatchStyle.Weave:
l1 = new SvgLineElement(0,4,4,0);
l2 = new SvgLineElement(8,4,4,8);
l3 = new SvgLineElement(0,0,0,4);
l4 = new SvgLineElement(0,4,4,8);
break;
case HatchStyle.WideDownwardDiagonal:
l1 = new SvgLineElement(0,0,8,8);
l2 = new SvgLineElement(0,1,8,9);
l3 = new SvgLineElement(7,0,8,1);
break;
case HatchStyle.WideUpwardDiagonal:
l1 = new SvgLineElement(8,0,0,8);
l2 = new SvgLineElement(8,1,0,9);
l3 = new SvgLineElement(0,1,-1,0);
break;
case HatchStyle.ZigZag:
l1 = new SvgLineElement(0,4,4,0);
l2 = new SvgLineElement(4,0,8,4);
break;
case HatchStyle.Percent05:
l1 = new SvgLineElement(0,0,1,0);
l2 = new SvgLineElement(4,4,5,4);
break;
case HatchStyle.Percent10:
l1 = new SvgLineElement(0,0,1,0);
l2 = new SvgLineElement(4,2,5,2);
l3 = new SvgLineElement(2,4,3,4);
l4 = new SvgLineElement(6,6,7,6);
break;
case HatchStyle.Percent20:
l1 = new SvgLineElement(0,0,2,0);
l2 = new SvgLineElement(4,2,6,2);
l3 = new SvgLineElement(2,4,4,4);
l4 = new SvgLineElement(5,6,7,6);
break;
case HatchStyle.Percent25:
l1 = new SvgLineElement(0,0,3,0);
l2 = new SvgLineElement(4,2,6,2);
l3 = new SvgLineElement(2,4,5,4);
l4 = new SvgLineElement(5,6,7,6);
break;
case HatchStyle.Percent30:
l1 = new SvgRectElement(0,0,3,1);
l2 = new SvgLineElement(4,2,6,2);
l3 = new SvgRectElement(2,4,3,1);
l4 = new SvgLineElement(5,6,7,6);
break;
case HatchStyle.Percent40:
l1 = new SvgRectElement(0,0,3,1);
l2 = new SvgRectElement(4,2,3,1);
l3 = new SvgRectElement(2,4,3,1);
l4 = new SvgRectElement(5,6,3,1);
break;
case HatchStyle.Percent50:
l1 = new SvgRectElement(0,0,3,3);
l2 = new SvgRectElement(4,4,4,4f);
break;
case HatchStyle.Percent60:
l1 = new SvgRectElement(0,0,4,3);
l2 = new SvgRectElement(4,4,4,4f);
break;
case HatchStyle.Percent70:
l1 = new SvgRectElement(0,0,4,5);
l2 = new SvgRectElement(4,4,4,4f);
break;
case HatchStyle.Percent75:
l1 = new SvgRectElement(0,0,7,3);
l2 = new SvgRectElement(0,2,3,7);
break;
case HatchStyle.Percent80:
l1 = new SvgRectElement(0,0,7,4);
l2 = new SvgRectElement(0,2,4,7);
break;
case HatchStyle.Percent90:
l1 = new SvgRectElement(0,0,7,5);
l2 = new SvgRectElement(0,2,5,7);
break;
default:
break;
}
if (l1 != null)
{
l1.Style.Set("stroke", col);
l1.Style.Set("fill", col);
patty.AddChild(l1);
}
if (l2 != null)
{
l2.Style.Set("stroke", col);
l2.Style.Set("fill", col);
patty.AddChild(l2);
}
if (l3 != null)
{
l3.Style.Set("stroke", col);
l3.Style.Set("fill", col);
patty.AddChild(l3);
}
if (l4 != null)
{
l4.Style.Set("stroke", col);
l4.Style.Set("fill", col);
patty.AddChild(l4);
}
}