c++ ja dynaaminen käyrä, opengl tai joku muu ratkaisu

[teele]

Joskus olisi mukava tehdä dynaaminen käyrä ja saada se näkymään ruudulla.

Olisiko opengl mahdollinen.

Alla oleva ohjelma toimii liukuvärjäyksen osalta, mutta kolmioita en saa onnistumaan.

Koodia: [Valitse]

#include<stdio.h>
#include<stdlib.h>
#include<X11/X.h>
#include<X11/Xlib.h>
#include<GL/gl.h>
#include<GL/glx.h>
#include<GL/glu.h>


//#include <GL/glew.h>  // oma lisäys, tätä ei ole



Display                 *dpy;
Window                  root;
GLint                   att[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
XVisualInfo             *vi;
Colormap                cmap;
XSetWindowAttributes    swa;
Window                  win;
GLXContext              glc;
XWindowAttributes       gwa;
XEvent                  xev;

void DrawAQuad() {
 glClearColor(1.0, 1.0, 1.0, 1.0);
 glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

 glMatrixMode(GL_PROJECTION);
 glLoadIdentity();
 glOrtho(-1., 1., -1., 1., 1., 20.);

 glMatrixMode(GL_MODELVIEW);
 glLoadIdentity();
 gluLookAt(0., 0., 10., 0., 0., 0., 0., 1., 0.);

 glBegin(GL_QUADS);
  glColor3f(1., 0., 0.); glVertex3f(-.75, -.75, 0.);
  glColor3f(0., 1., 0.); glVertex3f( .75, -.75, 0.);
  glColor3f(0., 0., 1.); glVertex3f( .75,  .75, 0.);
  glColor3f(1., 1., 0.); glVertex3f(-.75,  .75, 0.);
 glEnd();
}
 
// oma lisäys ***************************
void drawTriangle()
{
    glClearColor(0.4, 0.4, 0.4, 0.4);
    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0, 1.0, 1.0);
    glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);

        glBegin(GL_TRIANGLES);
                glVertex3f(-0.7, 0.7, 0);
                glVertex3f(0.7, 0.7, 0);
                glVertex3f(0, -1, 0);
        glEnd();

    glFlush();
}



int main(int argc, char *argv[]) {

 dpy = XOpenDisplay(NULL);
 
 if(dpy == NULL) {
  printf("\n\tcannot connect to X server\n\n");
        exit(0);
 }
       
 root = DefaultRootWindow(dpy);

 vi = glXChooseVisual(dpy, 0, att);

 if(vi == NULL) {
printf("\n\tno appropriate visual found\n\n");
        exit(0);
 }
 else {
printf("\n\tvisual %p selected\n", (void *)vi->visualid); /* %p creates hexadecimal output like in glxinfo */
 }


 cmap = XCreateColormap(dpy, root, vi->visual, AllocNone);

 swa.colormap = cmap;
 swa.event_mask = ExposureMask | KeyPressMask;
 
 win = XCreateWindow(dpy, root, 0, 0, 600, 600, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);

 XMapWindow(dpy, win);
 XStoreName(dpy, win, "VERY SIMPLE APPLICATION");
 
 glc = glXCreateContext(dpy, vi, NULL, GL_TRUE);
 glXMakeCurrent(dpy, win, glc);
 
 glEnable(GL_DEPTH_TEST);
 
 while(1) {
  XNextEvent(dpy, &xev);
       
        if(xev.type == Expose) {
        XGetWindowAttributes(dpy, win, &gwa);
                glViewport(0, 0, gwa.width, gwa.height);
        DrawAQuad();
                    // drawTriangle();  // ei toimi
                glXSwapBuffers(dpy, win);
        }
               
else if(xev.type == KeyPress) {
        glXMakeCurrent(dpy, None, NULL);
  glXDestroyContext(dpy, glc);
  XDestroyWindow(dpy, win);
  XCloseDisplay(dpy);
  exit(0);
        }
    } /* this closes while(1) { */
} /* this is the } which closes int main(int argc, char *argv[]) { */


Käännöskomento oli   

Koodia: [Valitse]

gcc -o quad quad.c -lX11 -lGL -lGLU