public override void ReEvaluateComputeValue(ref ReEvaluateArgs args)
{
var myspec = this.spec;
this.fillColor = myspec.ActualColor;
this.strokeColor = myspec.StrokeColor;
this.ActualStrokeWidth = ConvertToPx(myspec.StrokeWidth, ref args);
if (this.IsPathValid)
{
return;
}
ClearCachePath();
if (segments == null)
{
this.myCachedPath = null;
}
else
{
List <SvgPathSeg> segs = this.segments;
int segcount = segs.Count;
GraphicsPath gpath = this.myCachedPath = new GraphicsPath();
float lastMoveX = 0;
float lastMoveY = 0;
PointF lastPoint = new PointF();
PointF p2 = new PointF(); //curve control point
PointF p3 = new PointF(); //curve control point
PointF intm_c3_c = new PointF();
for (int i = 0; i < segcount; ++i)
{
SvgPathSeg seg = segs[i];
switch (seg.Command)
{
case SvgPathCommand.ZClosePath:
{
gpath.CloseFigure();
}
break;
case SvgPathCommand.MoveTo:
{
var moveTo = (SvgPathSegMoveTo)seg;
PointF moveToPoint;
moveTo.GetAbsolutePoints(ref lastPoint, out moveToPoint);
lastPoint = moveToPoint;
gpath.StartFigure();
lastMoveX = lastPoint.X;
lastMoveY = lastPoint.Y;
}
break;
case SvgPathCommand.LineTo:
{
var lineTo = (SvgPathSegLineTo)seg;
PointF lineToPoint;
lineTo.GetAbsolutePoints(ref lastPoint, out lineToPoint);
gpath.AddLine(lastPoint, lineToPoint);
lastPoint = lineToPoint;
}
break;
case SvgPathCommand.HorizontalLineTo:
{
var hlintTo = (SvgPathSegLineToHorizontal)seg;
PointF lineToPoint;
hlintTo.GetAbsolutePoints(ref lastPoint, out lineToPoint);
gpath.AddLine(lastPoint, lineToPoint);
lastPoint = lineToPoint;
}
break;
case SvgPathCommand.VerticalLineTo:
{
var vlineTo = (SvgPathSegLineToVertical)seg;
PointF lineToPoint;
vlineTo.GetAbsolutePoints(ref lastPoint, out lineToPoint);
gpath.AddLine(lastPoint, lineToPoint);
lastPoint = lineToPoint;
}
break;
//---------------------------------------------------------------------------
//curve modes......
case SvgPathCommand.CurveTo:
{
//cubic curve to (2 control points)
var cubicCurve = (SvgPathSegCurveToCubic)seg;
PointF p;
cubicCurve.GetAbsolutePoints(ref lastPoint, out p2, out p3, out p);
gpath.AddBezierCurve(lastPoint, p2, p3, p);
lastPoint = p;
}
break;
case SvgPathCommand.QuadraticBezierCurve:
{
//quadratic curve (1 control point)
//auto calculate for c1,c2
var quadCurve = (SvgPathSegCurveToQuadratic)seg;
PointF p;
quadCurve.GetAbsolutePoints(ref lastPoint, out intm_c3_c, out p);
SvgCurveHelper.Curve3GetControlPoints(lastPoint, intm_c3_c, p, out p2, out p3);
gpath.AddBezierCurve(lastPoint, p2, p3, p);
lastPoint = p;
}
break;
//------------------------------------------------------------------------------------
case SvgPathCommand.SmoothCurveTo:
{
//smooth cubic curve to
var smthC4 = (SvgPathSegCurveToCubicSmooth)seg;
PointF c2, p;
smthC4.GetAbsolutePoints(ref lastPoint, out c2, out p);
//connect with prev segment
if (i > 0)
{
//------------------
//calculate p1 from prev segment
//------------------
var prevSeg = segments[i - 1];
//check if prev is curve
switch (prevSeg.Command)
{
case SvgPathCommand.Arc:
case SvgPathCommand.CurveTo:
case SvgPathCommand.SmoothCurveTo:
case SvgPathCommand.QuadraticBezierCurve:
case SvgPathCommand.TSmoothQuadraticBezierCurveTo:
//make mirror point
p2 = SvgCurveHelper.CreateMirrorPoint(p3, lastPoint);
p3 = c2;
gpath.AddBezierCurve(lastPoint, p2, p3, p);
break;
default:
continue;
}
}
lastPoint = p;
}
break;
case SvgPathCommand.TSmoothQuadraticBezierCurveTo:
{
//curve 3
var smtC3 = (SvgPathSegCurveToQuadraticSmooth)seg;
PointF p;
smtC3.GetAbsolutePoints(ref lastPoint, out p);
if (i > 0)
{
//------------------
//calculate p1 from prev segment
//------------------
var prevSeg = segments[i - 1];
//check if prev is curve
switch (prevSeg.Command)
{
case SvgPathCommand.Arc:
case SvgPathCommand.CurveTo:
case SvgPathCommand.SmoothCurveTo:
{
PointF c = SvgCurveHelper.CreateMirrorPoint(p3, lastPoint);
SvgCurveHelper.Curve3GetControlPoints(lastPoint, c, p, out p2, out p3);
gpath.AddBezierCurve(lastPoint, p2, p3, p);
lastPoint = p;
}
break;
case SvgPathCommand.TSmoothQuadraticBezierCurveTo:
{
//make mirror point
PointF c = SvgCurveHelper.CreateMirrorPoint(intm_c3_c, lastPoint);
SvgCurveHelper.Curve3GetControlPoints(lastPoint, c, p, out p2, out p3);
gpath.AddBezierCurve(lastPoint, p2, p3, p);
lastPoint = p;
intm_c3_c = c;
}
break;
case SvgPathCommand.QuadraticBezierCurve:
{
PointF c = SvgCurveHelper.CreateMirrorPoint(intm_c3_c, lastPoint);
SvgCurveHelper.Curve3GetControlPoints(lastPoint, c, p, out p2, out p3);
gpath.AddBezierCurve(lastPoint, p2, p3, p);
lastPoint = p;
intm_c3_c = c;
}
break;
default:
continue;
}
}
lastPoint = p;
}
break;
case SvgPathCommand.Arc:
{
var arcTo = (SvgPathSegArc)seg;
PointF p;
arcTo.GetAbsolutePoints(ref lastPoint, out p);
if (lastPoint.IsEq(p))
{
return;
}
if (arcTo.R1 == 0 && arcTo.R2 == 0)
{
gpath.AddLine(lastPoint, p);
lastPoint = p;
return;
}
PointF[] bz4Points;
SvgCurveHelper.MakeBezierCurveFromArc(
ref lastPoint,
ref p,
arcTo.R1,
arcTo.R2,
arcTo.Angle,
arcTo.LargeArgFlag,
arcTo.SweepFlag,
out bz4Points);
int j = bz4Points.Length;
int nn = 0;
while (nn < j)
{
gpath.AddBezierCurve(
bz4Points[nn],
bz4Points[nn + 1],
bz4Points[nn + 2],
bz4Points[nn + 3]);
nn += 4; //step 4 points
}
//set control points
p3 = bz4Points[nn - 2];
p2 = bz4Points[nn - 3];
lastPoint = p;
//---------------------------------------------
}
break;
default:
throw new NotSupportedException();
}
}
}
ValidatePath();
}
