private Transform2d GetTextPositionTransform(GFNFont fnt, string txt, double x, double y, double size, double angle, TextAlign align, Transform2d t)
{
//computes the transformation needed to transform text drawn at origo to get to the wanted position
Transform2d res = Transform2d.Translate(x, y);
if (angle != 0.0)
{
res = Transform2d.Rotate(angle) * res;
}
if (align != TextAlign.BaseLeft)
{
double dx, dy;
GetTextAlignDXDY(fnt, txt, size, align, out dx, out dy);
res = Transform2d.Translate(dx, dy) * res;
}
res = Transform2d.Scale(size / fnt.CapHeight) * res;
if (t != null)
{
return(res * t);
}
return(res);
}
public static void EllipticArcToBeziers(double cx, double cy, double aradius, double bradius, double tilt, double startangle, double sweepangle, List <double> xy)
{
int cnt = xy.Count;
double startpar = EllipseAngleToParam(startangle, aradius, bradius);
double endpar = EllipseAngleToParam(startangle + sweepangle, aradius, bradius);
if (sweepangle >= MathUtil.Deg360)
{ //full ellipse
endpar = startpar + MathUtil.Deg360;
}
else if (sweepangle <= -MathUtil.Deg360)
{
endpar = startpar - MathUtil.Deg360;
}
else if (sweepangle > 0.0) //ccw
{
if (endpar <= startpar)
{
endpar += MathUtil.Deg360;
}
}
else //cw
{
if (endpar >= startpar)
{
endpar -= MathUtil.Deg360;
}
}
double sweepparam = endpar - startpar;
double bulge = GetArcBulgeFromSweepAngle(sweepparam);
ArcToBeziers(Math.Cos(startpar), Math.Sin(startpar), Math.Cos(endpar), Math.Sin(endpar), bulge, xy);
//transform bezier circular arc to elliptical arc
Transform2d tr = Transform2d.Stretch(aradius, bradius) * Transform2d.Rotate(tilt) * Transform2d.Translate(cx, cy);
for (int l = cnt; l < xy.Count; l += 2)
{
double tx, ty;
tr.Apply(xy[l], xy[l + 1], out tx, out ty, true);
xy[l] = tx;
xy[l + 1] = ty;
}
}