Generative Components

Hi All,

For those who are interested, one of the reasons the lines could turn back on the line is the way I wrote the function.

It created circles based on the previous point to generate the next point which is handy but does give you 2 points in most cases so it is a matter of choosing which point to use index [0] or [1]. I think in my example it was set to
MyNextPoint = MyNextIntPointCount[1];

Thinking that as the intersecting points are created point[0] would be closest to the start of the BSpline. But this is not always the case.

I should include some checking to determine which point to use but at this stage you can just change the value to [0] and it will all work :)

Thanks
Wayne

hi Wayne, I am finding that incremental distance routine is returning back on itself along the line, then continue on to the end. eg.

CS5[10] has CS5[12] on top of it and CS5[11] has CS5[13]. so the line starts ok but then is going back and fourth and then continues on to the end. which explains why I am getting too many lengths at the end? 

I have set MyNextPoint = MyNextIntPointCount[0]

Hi Richard,

I am guessing that it could change indices as it moves along for some reason. So it may not be the best approach to rely on MyNextIntPointCount[0] or MyNextIntPointCount[1].

Is there some other way to check if it is [0] or [1]. For example does it continue in the x direction or y direction. You could then do a test if MyNextIntPointCount[0].X is greater or less than MyNextIntPointCount[1].X ?

Then you could use which ever is greater as the next point.

That might be a good way of error checking.

Thanks

Wayne

thanks for your reply Wayne. The next point will always be a greater value than the previous because it runs along a line that starts at zero (chainage) and increases as it moves along the line (bspline). the line can go either way in the X or Y direction.

Hi Richard,

So as it can not be defined as increasing in X or Y (could go either way). I had a bit of a dig around in the debug window and found I think what you need. Even though the points are generated as  AtCurveSurfaceIntersection the distancealong value is 0.

But...

Looking a bit further at the values for the MyNextIntPointCount in the function and the 2 points it has contained.

The points have a T value. Which look suspiciously like a parameter along curve. Looking at the 2 values for MyNextIntPointCount [0] and MyNextIntPointCount [1]

They do seam to align generally with the intersection points along the curve. I suspect they are rounded a little so as long as you are not asking it for a fine step it should be ok.

So the you just need to add an additional if statement to check which one is next along the bspline.

if (MyNextIntPointCount.Count > 1)
{
if (MyNextIntPointCount[0].T > MyNextIntPointCount[1].T)
{
MyNextPoint = MyNextIntPointCount[0];
}
else
{
MyNextPoint = MyNextIntPointCount[1];
}
}

I think that should work.

Give it a try. I have updated the script in the attached file.

Thanks

Wayne

6012.Incremental_Distance.dgn

Hi Richard,

So as it can not be defined as increasing in X or Y (could go either way). I had a bit of a dig around in the debug window and found I think what you need. Even though the points are generated as  AtCurveSurfaceIntersection the distancealong value is 0.

But...

Looking a bit further at the values for the MyNextIntPointCount in the function and the 2 points it has contained.

The points have a T value. Which look suspiciously like a parameter along curve. Looking at the 2 values for MyNextIntPointCount [0] and MyNextIntPointCount [1]

They do seam to align generally with the intersection points along the curve. I suspect they are rounded a little so as long as you are not asking it for a fine step it should be ok.

So the you just need to add an additional if statement to check which one is next along the bspline.

if (MyNextIntPointCount.Count > 1)
{
if (MyNextIntPointCount[0].T > MyNextIntPointCount[1].T)
{
MyNextPoint = MyNextIntPointCount[0];
}
else
{
MyNextPoint = MyNextIntPointCount[1];
}
}

I think that should work.

Give it a try. I have updated the script in the attached file.

Thanks

Wayne

6012.Incremental_Distance.dgn