/// <summary>Paint on the graphics context</summary>
/// <param name="context">The graphics context to draw on</param>
public override void Paint(IDrawContext context)
{
CalcBezPoints();
if (bezPoints.Count != 0)
{
// Create point for upper-left corner of drawing.
context.NewPath();
if (Selected)
{
context.SetColour(Color.Blue);
}
else
{
context.SetColour(DefaultOutlineColour);
}
// Draw text if necessary
if (Name != null)
{
DrawCentredText(context, Name, Location);
}
context.MoveTo(bezPoints[0].X, bezPoints[0].Y);
Point controlPoint = new Point(Location.X, Location.Y);
Point bezPoint = bezPoints[bezPoints.Count - 1];
context.CurveTo(controlPoint.X, controlPoint.Y, controlPoint.X, controlPoint.Y, bezPoint.X, bezPoint.Y);
context.Stroke();
// find closest point in the bezPoints to the intersection point that is outside the target
// work backwards through BezPoints array and use the first one that is outside the target
for (int i = bezPoints.Count - 1; i >= 0; i--)
{
Point arrowHead;
if (!Target.HitTest(bezPoints[i]))
{
arrowHead = bezPoints[i];
i--;
//keep moving along the line until distance = target radius
double targetRadius = Target.Width / 2;
while (i >= 0)
{
double dist = GetDistance(bezPoints[i], arrowHead);
if (dist >= 20)
{
DrawArrow(context, bezPoints[i], arrowHead);
break;
}
i--;
}
break;
}
}
}
}
