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);
}
void OnDrawAreaWheel(object sender, WheelEventArgs e)
{
Drawing drw = CurrentDrawing;
if (drw != null)
{
double scale;
if (e.Delta < 0)
{
scale = 0.8;
}
else
{
scale = 1.0 / 0.8;
}
drw.ViewTransform = drw.ViewTransform * Transform2d.Translate(-cursorpixel.X, -cursorpixel.Y) * Transform2d.Scale(scale) * Transform2d.Translate(cursorpixel.X, cursorpixel.Y);
drawarea.Redraw();
}
}