/// <summary>
/// Check whether a certain percentage of the stroke is within the lasso
/// </summary>
/// <param name="lassoPoints"></param>
/// <param name="percentageWithinLasso"></param>
/// <returns></returns>
public bool HitTest(IEnumerable<Point> lassoPoints, int percentageWithinLasso)
{
if (lassoPoints == null)
{
throw new System.ArgumentNullException("lassoPoints");
}
if ((percentageWithinLasso < 0) || (percentageWithinLasso > 100))
{
throw new System.ArgumentOutOfRangeException("percentageWithinLasso");
}
if (percentageWithinLasso == 0)
{
return true;
}
StrokeInfo strokeInfo = null;
try
{
strokeInfo = new StrokeInfo(this);
StylusPointCollection stylusPoints = strokeInfo.StylusPoints;
double target = strokeInfo.TotalWeight * percentageWithinLasso / 100.0f - PercentageTolerance;
Lasso lasso = new SingleLoopLasso();
lasso.AddPoints(lassoPoints);
for (int i = 0; i < stylusPoints.Count; i++)
{
if (true == lasso.Contains((Point)stylusPoints[i]))
{
target -= strokeInfo.GetPointWeight(i);
if (DoubleUtil.LessThan(target, 0f))
{
return true;
}
}
}
return false;
}
finally
{
if (strokeInfo != null)
{
//detach from event handlers, or else we leak.
strokeInfo.Detach();
}
}
}
/// <summary>
/// Check whether a certain percentage of the stroke is within the Rect passed in.
/// </summary>
/// <param name="bounds"></param>
/// <param name="percentageWithinBounds"></param>
/// <returns></returns>
public bool HitTest(Rect bounds, int percentageWithinBounds)
{
if ((percentageWithinBounds < 0) || (percentageWithinBounds > 100))
{
throw new System.ArgumentOutOfRangeException("percentageWithinBounds");
}
if (percentageWithinBounds == 0)
{
return true;
}
StrokeInfo strokeInfo = null;
try
{
strokeInfo = new StrokeInfo(this);
StylusPointCollection stylusPoints = strokeInfo.StylusPoints;
double target = strokeInfo.TotalWeight * percentageWithinBounds / 100.0f - PercentageTolerance;
for (int i = 0; i < stylusPoints.Count; i++)
{
if (true == bounds.Contains((Point)stylusPoints[i]))
{
target -= strokeInfo.GetPointWeight(i);
if (DoubleUtil.LessThanOrClose(target, 0d))
{
return true;
}
}
}
return false;
}
finally
{
if (strokeInfo != null)
{
//detach from event handlers, or else we leak.
strokeInfo.Detach();
}
}
}