OTOT*****Simple OpenGL question, User Input and pixel size.*****

[adlep]

HeSorry to posting here, but the Software section is rather slow today...:
have to create a line drawing algorithm (done), but on the top of that I need to add to my program an user's input option.
User should be able to specify the pixel size from 1 to 10 so that it is possible to see clearly the effect of rasterization in window.
So if user specifies 1, program draws a nice straight line, but if the input is 10, program draws a nasty, big line full of jigglies, because of no antialiasing algorithm...
Help Plz?
Is the SetPixel() function is a right function to use?

 

[Mucman]

First result in google

 

[adlep]

Pardon my ignorance, but the first look at the code doesn't shine any light 😱
Where is the user's input part?
Edit: Second look does reaveal some similarites, yet I have a feelingthat it is not qite what I am looking for 😀
Could you reaveal your google query ?
P.S. Congratualtions on your google skills....

 

[Mucman]

From the code that was in that link (google query = OpenGL Point size):

glPointSize(2.0);

You can handle user input any way you want... through GLUI, the console... that's more programmer preference than anything else.

 

[adlep]

So I guess the SetPixel() function does specify the initial coodinates of the point and not the pixel size... Right?

 

[Mucman]

That is correct.

I just realized something... glSetPixel() may not be affected by glPointSize(). Perhaps you need to draw your
lines like:

glBegin(GL_POINTS);
glVertex3f(x, y, z);
....
glEnd();

glSetPixel() operates purely on the pixel level.

 

[adlep]

That shines some extra lines, thanks,
🙂

 

[Mucman]

Originally posted by: adlep
That shines some extra lines, thanks,
🙂

Glad I could help!