Thread: C program with g2 graphic library

Hey,
I had to create a graphic with g2 graphic library, but the program doesn't draw anything, not even the line. Also, I can't change the font size. I'm using gcc with -Wall -ansi -pedantic -lgd -lX11 -lm and -lg2. I have ubuntu running in virtualbox.
Could you give me some help?
Here's the code:

Code:

#include<stdio.h>
#include<stdlib.h>
#include<g2.h>
#include<g2_X11.h>
#include<math.h>


void funcao1(janela){

    const double pi = 4.*atan(1.);

    int x;
    float y1;

    while(x!=600){


    y1=sin(2*pi*0.01*x)+300;
    
    g2_pen(janela,2);

    g2_plot(janela,x,y1);
    x=x+1;
    

    }

    return (1);
    }




int main(){
    int janela;

    janela = g2_open_X11(800,600);

    g2_line(janela,1,300,1,300);

    funcao1(janela);
    
    


    



    getchar();
    g2_close(janela);
    exit(0);
}

Also, could someone explain to me why I couldn't put zero in the return? As far as I know, the function won't return anything or will it?

you probably need a g2_flush in there after your drawing commands

edit: btw I never heard of g2. all I did was google 'g2 graphics library example' and got this link http://www.tp.umu.se/modsim/linux-guide/g2.html