Plot line on CNiGraph3D object

Hi
I am adding some new feature into the existing code that use CNiGraph3D to display data. The data is some amplitude associated with it's location of scan (x and y). The existing code scan data from a whole area, so the graph is filled. But the new feature will scan data from just a path (eg line). So I wonder if there's a way to plot line data on CNiGraph3D object.
For example, I have this sequence of data (represented in x,y,amplitde)
(5,17,3.6)
(6,15,-9.2)
(7,14,4.9)
(6,12,-0.27)
(5,10,-2.45)
I would like to plot this data on CNiGraph3D. The graph is 10 units wide on x axis, and 20 units tall on y axis. And different value of amplitude will be plotted in difference color on Z axis.
creating a matrix of 10x20 and fill the remaing coordinates (aside from those 5 coordinates above) with some constant value (0 or something else), but it's kind of waste of memory (my real code would be so much bigger than 10x20). So I wonder if there's any alternative way to plot this kind of data on CNiGraph3D?
Thanks

The main difficulty is to calculate the X position from the click position. First, you have to find the position in the graph pane. The left position of the pane is obtained by subtracting the width of the Y scale to its left position. Then there are some basic calculations to convert the click relative position to the corresponding X value, using the scale min and max.
The second point is to create a cursor. Use the "Cursor list" attribute, which is an array of all the available cursors properties, and append a new one to the list.
Attached is a simplified version of a tool I developed some times ago with the same goal.
It answers to questions you didn't ask :
- How can I move an existing cursor without creating a new one each time I click on the graph ?
answer : the cursors are only created when you hold down the key while clicking
- How can I remove a cursor ?
answer : hold the key down while clicking close to the cursor you want to delete.
Have a look at the way the closest cursor is detected, by calculating the distance between the click position and the cursors.
Since I still have difficulties with the size of the attached documents, the vi is divided in several subs.
CC
Chilly Charly (aka CC)
E-List Master - Kudos glutton - Press the yellow button on the left...
Attachments:
Graph cursors.vi.zip ‏19 KB

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