public CGRect Cancel()
{
var updateRect = CGRectExtensions.CGRectNull();
foreach (var point in Points)
{
point.PointType |= PointType.Cancelled;
updateRect = updateRect.UnionWith(CalcUpdateRectFor(point));
}
return(updateRect);
}
private CGRect CalcUpdateRectFor(LinePoint point)
{
if (point == null)
{
return(CGRectExtensions.CGRectNull());
}
var rect = new CGRect(point.Location, CGSize.Empty);
// The negative magnitude ensures an outset rectangle
var magnitude = -3 * LineWidth - 2;
rect = rect.Inset(magnitude, magnitude);
return(rect);
}
public CGRect RemovePointsWithType(PointType type)
{
var updateRect = CGRectExtensions.CGRectNull();
LinePoint priorPoint = null;
for (var i = Points.Count - 1; i >= 0; i--)
{
var point = Points[i];
if (point.PointType.HasFlag(type))
{
Points.RemoveAt(i);
updateRect = updateRect.UnionWith(CalcUpdateRectFor(point));
updateRect = updateRect.UnionWith(CalcUpdateRectFor(priorPoint));
}
priorPoint = point;
}
return(updateRect);
}