Glut Error: No rotation

This is a discussion on Glut Error: No rotation within the C++ Programming forums, part of the General Programming Boards category; Hello, I have finished my code for a simple rotation program in glut. The problem is this: the program does ...

  1. #1
    Registered User
    Join Date
    Apr 2011
    Posts
    37

    Unhappy Glut Error: No rotation

    Hello, I have finished my code for a simple rotation program in glut. The problem is this: the program does not rotate!!!! Could you please help me by looking over my code? Thanks!!!

    Code:
    #include <GL/glut.h>
    #include <iostream>
    
    void enable (void) {
        glEnable (GL_DEPTH_TEST); //enable the depth testing
        glEnable (GL_LIGHTING); //enable the lighting
        glEnable (GL_LIGHT0); //enable LIGHT0, our Diffuse Light
        glShadeModel (GL_SMOOTH); //set the shader to smooth shader
        }
    
    
    void renderScene(void) {
       glClear(GL_COLOR_BUFFER_BIT);
       glBegin(GL_TRIANGLES);
       glColor3f(1,0,0);//Change the object color to red
          glVertex3f(-2.0,-0.1,0.0);
          glVertex3f(0.4,0.0,0.0);
          glVertex3f(0.0,0.0,0.0);
       glEnd();
       glFlush();
    }
    
    
    void keyboard (unsigned char key, int x, int y) {
        if (key==q)
        {
        xrot += 1;
        if (xrot >360) xrot -= 360;
        }
    
        if (key==z)
        {
        xrot -= 1;
        if (xrot < -360) xrot += 360;
        }
    
        if (key==w)
        {
        float xrotrad, yrotrad;
        yrotrad = (yrot / 180 * 3.141592654f);
        xrotrad = (xrot / 180 * 3.141592654f);
        xpos += float(sin(yrotrad)) ;
        zpos -= float(cos(yrotrad)) ;
        ypos -= float(sin(xrotrad)) ;
        }
    
        if (key==s)
        {
        float xrotrad, yrotrad;
        yrotrad = (yrot / 180 * 3.141592654f);
        xrotrad = (xrot / 180 * 3.141592654f);
        xpos -= float(sin(yrotrad));
        zpos += float(cos(yrotrad)) ;
        ypos += float(sin(xrotrad));
        }
    
        if (key==d)
        {
        yrot += 1;
        if (yrot >360) yrot -= 360;
        }
    
        if (key==a)
        {
        yrot -= 1;
        if (yrot < -360)yrot += 360;
        }
        if (key==27)
        {
        exit(0);
        }
    
    
    
    int main(int argc, char **argv) {
       glutInit(&argc, argv);
       glutInitDisplayMode(GLUT_DEPTH | GLUT_SINGLE | GLUT_RGBA);
       glutInitWindowPosition(100,100);
       glutInitWindowSize(800,800);
       glutCreateWindow("MynDrawn: An Open Source Alternative to Minecraft");
       glutDisplayFunc(renderScene);
    glutIdleFunc (display); //update any variables in display,
    //display can be changed to anyhing, as long as you move the
    variables to be updated, in this case, angle++;
    glutReshapeFunc (reshape); //reshape the window accordingly
    glutKeyboardFunc (keyboard); //check the keyboard
    glutMainLoop (); //call the main loop
    return 0;
    }

  2. #2
    and the hat of wrongness Salem's Avatar
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    Where's the rest of the code - say any code which USES xrot when calling Glut drawing functions.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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