/// <summary>
/// Updates profile plot if profile annotation has been made.
/// </summary>
internal void UpdateProfile()
{
if (Mode == MouseMode.Profile && ProfileAnnotation != null && ProfileAnnotation.ControlPoints.Count >= 2)
{
Vec2 profileStart = ProfileAnnotation.ControlPoints[0].GetXY();
Vec2 profileEnd = ProfileAnnotation.ControlPoints[1].GetXY();
ProfileAnnotation.LineWidth = Profile.ProfileWidth;
double profileRadius = ProfileAnnotation.LineWidth / 2;
Vec2 delta = profileEnd - profileStart;
double l = delta.Norm();
Vec2 n = new Vec2(delta.Y, -delta.X) / l; // Unit normal
// Extract profile data
Profile.Clear();
double tstep = 1.0 / Math.Max(Math.Abs(delta.X), Math.Abs(delta.Y));
for (double t = 0; t <= 1; t += tstep)
{
Vec2 f = profileStart + t * delta;
double r = t * l;
double sum = 0.0;
double count = 0.0;
for (double s = 0; s < profileRadius; s++)
{
sum += PictureBox.GetValueImage(f + s * n);
count++;
if (s > 0)
{
sum += PictureBox.GetValueImage(f - s * n);
count++;
}
}
Profile.AddPoint(r, sum / count);
}
Profile.Location = PointToScreen(Point.Round(PictureBox.PictureToScreen(profileEnd).ToPointF()));
Profile.Draw();
if (!Profile.Visible)
{
Profile.Show();
}
}
}