public static bool LineContainsPoint(double x1, double y1, double x2, double y2, double px, double py)
{
RectangleD r = new RectangleD(new PointD(x1, y1));
r.Add(x2, y2);
r.Inflate(2.0, 2.0);
if (!r.Contains(px, py))
{
return(false);
}
double a, b, x, y;
if (x1 == x2)
{
return(Math.Abs(px - x1) < 3.0);
}
if (y1 == y2)
{
return(Math.Abs(py - y1) < 3.0);
}
a = (y1 - y2) / (x1 - x2);
b = y1 - a * x1;
x = (py - b) / a;
y = a * px + b;
return(Math.Min(Math.Abs(x - px), Math.Abs(y - py)) < 4.0);
}
public static bool RectangleInsideGdkRegion(RectangleD r, Gdk.Region region)
{
r.Inflate(1.0, 1.0);
Gdk.Rectangle gdkRect = GdkRectangle(r);
Gdk.OverlapType type = region.RectIn(gdkRect);
return(type == Gdk.OverlapType.In || type == Gdk.OverlapType.Part);
}
