double Distance(Point p1, Point p2)
{
double xd = Math.Abs(p1.X - p2.X);
double yd = Math.Abs(p1.Y - p2.Y);
return(Math.Sqrt(Math.Pow(xd, 2) + Math.Pow(yd, 2)));
}
void TranslateToOriginCoords(Point point)
{
point.X = Math.Max(0, point.X - xOffset);
point.Y = Math.Max(0, point.Y - yOffset);
point.X = Math.Min(sourceWidth, (int)(point.X / xScale));
point.Y = Math.Min(sourceHeight, (int)(point.Y / yScale));
}
void DrawArrow(Context c, Point src, Point dest)
{
double vx1, vy1, vx2, vy2;
double angle = Math.Atan2(dest.Y - src.Y, dest.X - src.X) + Math.PI;
vx1 = dest.X + (ARROW_LENGHT + LINE_WIDTH) * Math.Cos(angle - ARROW_DEGREES);
vy1 = dest.Y + (ARROW_LENGHT + LINE_WIDTH) * Math.Sin(angle - ARROW_DEGREES);
vx2 = dest.X + (ARROW_LENGHT + LINE_WIDTH) * Math.Cos(angle + ARROW_DEGREES);
vy2 = dest.Y + (ARROW_LENGHT + LINE_WIDTH) * Math.Sin(angle + ARROW_DEGREES);
c.MoveTo(dest.X, dest.Y);
c.LineTo(vx1, vy1);
c.MoveTo(dest.X, dest.Y);
c.LineTo(vx2, vy2);
c.Stroke();
c.Fill();
}
protected virtual void OnDrawingareaMotionNotifyEvent(object o, Gtk.MotionNotifyEventArgs args)
{
Point point;
if (!Sensitive)
{
return;
}
if (selectedCoords == null)
{
return;
}
point = new Point((int)args.Event.X, (int)args.Event.Y);
TranslateToOriginCoords(point);
selectedPoint.Y = point.Y;
selectedPoint.X = point.X;
QueueDraw();
}
void FindNearestPoint(Point cursor, out Coordinates coords, out Point point)
{
double minDistance = Int32.MaxValue;
coords = null;
point = null;
TranslateToOriginCoords(cursor);
foreach (Coordinates c in Coordinates)
{
foreach (Point p in c)
{
double dist = Distance(cursor, p);
if (dist < minDistance)
{
minDistance = dist;
coords = c;
point = p;
}
}
}
}
void DrawPoint(Context c, Point location)
{
c.Arc(location.X, location.Y, LINE_WIDTH, 0, 2 * Math.PI);
c.StrokePreserve();
c.Fill();
}
void DrawLine(Context c, Point src, Point dest)
{
c.MoveTo(src.X, src.Y);
c.LineTo(dest.X, dest.Y);
c.Stroke();
}
Point TranslateToDestCoords(Point point)
{
return(new Point((int)(point.X * xScale),
(int)(point.Y * yScale)));
}