Issues texturing a 2d polygon

I've got a shape like a line graph that I want to apply a texture (bmp with vertical lines) to. I apply the texture and the lines are horizontal. I rotate the bmp 90 degrees and still the lines are horizontal. I know it's to do with the "u" and "v" values, but it's got me going nuts. Can someone have a look at this code and see if you can help me figure out how to fix the texturing problem.

For each point on the x axis of the graph where I have a y value, I put a vertex at 0, and a vertex at y-value. I then move to the next x value.

------------- code section --------------

For GraphLoop = 1 To NumXValues
v=AddVertex(Surf,4,0,GraphLoop,0,1,0) ; create vertex on horiz plane
v=AddVertex(Surf,4,GraphLoop(GraphValues),tempy,0,0,0) ; create vertex at y-value
Next

For GraphPolyLoop = 0 To 5
v0 = GraphPolyLoop * 2
v1 = v0 + 1
v2 = v1 + 1
v3 = v2 + 1
AddTriangle (surf,v0,v1,v2)
AddTriangle (surf,v2,v1,v3)
next

--------------------------------
I load a brush and paint it with
PaintMesh (GraphMesh,GraphTextureBrush)


Any thoughts would be appreciated!!!

Cheers!
Shane

There seems to be something wrong, here you say
For GraphLoop = 1 To NumXValues

but a few lines later GraphLoop is used as an array:
...GraphLoop(GraphValues)...

(where you didn't say what GraphValues is). Not sure if this is the cause (I'm surprised this is running at all), but it surely complicates things in a confusing way.

Oops, sorry, I changed my variable names before posting to try to make it more readable. The code should be

For GraphLoop = 1 To NumXValues
v=AddVertex(Surf,4,0,GraphLoop,0,1,0) ; create vertex on horiz plane
v=AddVertex(Surf,4,GraphValues(GraphLoop),tempy,0,0,0) ; create vertex at y-value
Next

For GraphPolyLoop = 0 To 5
v0 = GraphPolyLoop * 2
v1 = v0 + 1
v2 = v1 + 1
v3 = v2 + 1
AddTriangle (surf,v0,v1,v2)
AddTriangle (surf,v2,v1,v3)
next

Where GraphValues is an array of several integers.

---------------

In short, I'm looping across the x values creating 2 verticies for each. I need help with how to set the u and v values with the AddVertex commands above so that I can properly map a texture to it.

I have no idea what GraphLoop is for.

UV Coordinates work like this:

(0,1) ... (1,1)
  .         .
  .         .
  .         .
(0,0) ... (1,0)

If you set the UV coords for a single quad to those, the texture will be painted unrotated and uncropped to the quad.

(0,0) is the top-left corner, Octo. :) Like this:

(0,0) ... (1,0)
  .         .
  .         .
  .         .
(0,1) ... (1,1)

Sorry, been spending too much time with DirectX in C++.

hockings - maybe simply try to swap U and V.

bram32 on codersworkshop was able to shed some light on the problem.

To set the u# and v# of each vertex, you should use VertexTexCoords.


v1=AddVertex(Surf,4,0,GraphLoop,0,1,0) ; create vertex on horiz plane
v2=AddVertex(Surf,4,GraphValues(GraphLoop),tempy,0,0,0) ; create vertex at y-value

vertextexcoords Surf, v1, 0, float(graphloop) / float(numxvalues)
vertextexcoords Surf, v2, 1, float(graphloop) / float(numxvalues)

A little bit of tweaking and it was working a treat!

You don't need to specify the UV coords separately by using the VertexTexCoords command. You can specify the UVs in the AddVertex commands you're using beforehand.