public static void DrawCoteInverse(this Cairo.Context ctx, Cairo.PointD p1, Cairo.PointD p2,
double stroke = 1.0, bool fill = false, double arrowWidth = 3.0, double arrowLength = 7.0)
{
Cairo.PointD vDir = p2.Substract(p1);
vDir = vDir.GetNormalized();
Cairo.PointD vPerp = vDir.GetPerp();
Cairo.PointD pA0 = p1.Add(vDir.Multiply(arrowLength));
Cairo.PointD pA1 = p2.Substract(vDir.Multiply(arrowLength));
Cairo.PointD vA = vPerp.Multiply(arrowWidth);
ctx.MoveTo(p1.Add(vA));
ctx.LineTo(pA0);
ctx.LineTo(p1.Substract(vA));
if (fill)
{
ctx.LineTo(p1.Add(vA));
}
ctx.MoveTo(p2.Add(vA));
ctx.LineTo(pA1);
ctx.LineTo(p2.Substract(vA));
if (fill)
{
ctx.LineTo(p2.Add(vA));
ctx.Fill();
}
ctx.MoveTo(pA0);
ctx.LineTo(pA1);
ctx.LineWidth = stroke;
ctx.Stroke();
}
public static void DrawCote(this Cairo.Context ctx, Cairo.PointD p1, Cairo.PointD p2, double stroke = 1.0)
{
const double arrowWidth = 4.0;
const double arrowLength = 10.0;
Cairo.PointD vDir = p2.Substract(p1);
vDir = vDir.GetNormalized();
Cairo.PointD vPerp = vDir.GetPerp();
Cairo.PointD pA0 = p1.Add(vDir.Multiply(arrowLength));
Cairo.PointD pA1 = p2.Substract(vDir.Multiply(arrowLength));
Cairo.PointD vA = vPerp.Multiply(arrowWidth);
ctx.MoveTo(p1);
ctx.LineTo(pA0.Add(vA));
ctx.LineTo(pA0.Substract(vA));
ctx.LineTo(p1);
ctx.MoveTo(p2);
ctx.LineTo(pA1.Add(vA));
ctx.LineTo(pA1.Substract(vA));
ctx.LineTo(p2);
ctx.Fill();
ctx.MoveTo(p1);
ctx.LineTo(p2);
ctx.LineWidth = stroke;
ctx.Stroke();
}
public static void DrawCoteFixed(this Cairo.Context ctx, Cairo.PointD p1, Cairo.PointD p2,
double stroke = 1.0, double coteWidth = 3.0)
{
Cairo.PointD vDir = p2.Substract(p1);
vDir = vDir.GetNormalized();
Cairo.PointD vPerp = vDir.GetPerp();
Cairo.PointD vA = vPerp.Multiply(coteWidth);
ctx.MoveTo(p1.Add(vA));
ctx.LineTo(p1.Substract(vA));
ctx.MoveTo(p2.Add(vA));
ctx.LineTo(p2.Substract(vA));
ctx.MoveTo(p1);
ctx.LineTo(p2);
ctx.LineWidth = stroke;
ctx.Stroke();
}