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POHow to plot using openGL using user-given values / asking for values?
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copied!<p><strong>Limitations:</strong></p> <ul> <li>I can't change the frameworks </li> <li>I have to use the functions in the program (my beloved teacher doesn't like us using functions given by any other than herself)</li> </ul> <p>Here's the code and it works just like this (just not as smooth as i would like it to)</p> <pre><code>#include<OpenGL/gl.h> #include<OpenGL/glu.h> #include<GLUT/glut.h> #include <stdlib.h> #include <math.h> int lb=-30, ub=30; double cpoints=9999999; void init (void) { glClearColor(1,1,1,1); glMatrixMode(GL_PROJECTION); gluOrtho2D(-30,30,-30,30); } void graphfunct2D(void) { double dx, xi, yi; dx = (ub-lb)*1.0/cpoints; glColor3f(0,0,0); glClear(GL_COLOR_BUFFER_BIT); xi = lb; yi = xi*sin(xi); int i; for (i=0; i<=cpoints;i++) { glBegin(GL_POINTS); glVertex2i(xi,yi); glEnd(); xi = xi+dx; yi = xi*sin(xi); } glFlush(); } int main (int argc, char** argv) { glutInit(&argc, argv); /*printf("lower bound: "); scanf(" %d",&lb); printf("upper bound:"); scanf(" %d",&ub); printf("Give me the number of points to plot (int)"); scanf(" %d",&cpoints);*/ glutInitWindowSize(500,500); glutCreateWindow("Graph function in 2D"); init(); glutDisplayFunc(graphfunct2D); glutMainLoop(); } </code></pre> <p>I want the user to be able to provide the upper and lower bounds and plot the function based on those two but when i run the program with the inputs uncommented it doesnt display anything (when i dont ask for them and use the ones i defined it runs just fine)</p>

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