private static void DrawArrowHead(Context context, PointD tip, PointD tail)
{
// Length & width of arrow (Adjustable)
const double aLength = 10.0;
const double aWidth = 3.5;
// Arrow direction & perpendicular vector
PointD direction = tail.Substract(tip); // tail - tip
direction = direction.Normalize();
PointD perpendicular = new PointD(-direction.Y, direction.X);
// Arrow vertices
PointD pointOnLine = tip.Add(direction.Multiply(aLength)); // tip + aLength * direction
PointD arrowVertex1 = pointOnLine.Add(perpendicular.Multiply(aWidth)); // pointOnLine + aWidth * perpendicular
PointD arrowVertex2 = pointOnLine.Substract(perpendicular.Multiply(aWidth)); // pointOnLine - aWidth * perpendicular
context.MoveTo(tip);
context.LineTo(arrowVertex1);
context.LineTo(arrowVertex2);
context.LineTo(tip);
context.ClosePath();
context.FillPreserve();
context.Stroke();
}
void drawDesignOverlay(Context gr, Widget g, Rectangle cb, Rectangle hr, double coteStroke, double space = 6.5)
{
double z = zoom / 100.0;
double coteW = 3, coteL = 5;
bool fill = true;
PointD p1 = new PointD(hr.X + 0.5, hr.Y - space);
PointD p2 = new PointD(hr.Right - 0.5, hr.Y - space);
if (p1.Y < cb.Top)
{
if (hr.Bottom > cb.Bottom - space)
{
p1.Y = p2.Y = hr.Bottom - space;
}
else
{
p1.Y = p2.Y = hr.Bottom + space;
}
}
if (g.Width.IsFit)
{
gr.DrawCoteInverse(p1, p2, coteStroke, fill, coteW, coteL);
}
else if (g.Width.IsRelativeToParent)
{
gr.DrawCote(p1, p2, coteStroke, fill, coteW, coteL);
if (g.Width.Value < 100)
{
drawCenteredTextLine(gr, p1.Add(p2.Substract(p1).Divide(2)), g.Width.ToString());
}
}
else if (g.Width.IsFixed)
{
gr.DrawCoteFixed(p1, p2, coteStroke * 2.0, coteW);
drawCenteredTextLine(gr, p1.Add(p2.Substract(p1).Divide(2)), g.Width.Value.ToString());
}
p1 = new PointD(hr.X - space, hr.Top + 0.5);
p2 = new PointD(hr.X - space, hr.Bottom - 0.5);
if (p1.X < cb.Left)
{
if (hr.Right > cb.Right - space)
{
p1.X = p2.X = hr.Right - space;
}
else
{
p1.X = p2.X = hr.Right + space;
}
}
if (g.Height.IsFit)
{
gr.DrawCoteInverse(p1, p2, coteStroke, fill, coteW, coteL);
}
else if (g.Height.IsRelativeToParent)
{
gr.DrawCote(p1, p2, coteStroke, fill, coteW, coteL);
if (g.Height.Value < 100)
{
drawCenteredTextLine(gr, p1.Add(p2.Substract(p1).Divide(2)), g.Height.ToString());
}
}
else if (g.Width.IsFixed)
{
gr.DrawCoteFixed(p1, p2, coteStroke * 2.0, coteW);
drawCenteredTextLine(gr, p1.Add(p2.Substract(p1).Divide(2)), g.Height.Value.ToString());
}
// hr.Inflate (2);
//gr.SetDash (new double[]{ 1.0, 4.0 }, 0.0);
//gr.SetSourceColor (Color.Grey);
// gr.Rectangle (hr,coteStroke);
// gr.Stroke ();
gr.Operator = Operator.Over;
}