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| #include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <math.h>
#define width 640
#define height 480
#define h_scale 5
#define w_scale 5
#define grad_size 0.02
#define subdiv_nb 2
//affichage de la grille (arrière plan, constitué de deux parties, les axes et le quadrillage)
void display_grid(void)
{
int i=0;
int j=0;
//first grid
glBegin(GL_POINTS);
glColor3f(0.0,0.5,0.0);
for(i=1; i<= 2*w_scale*subdiv_nb; i++)
{
for(j=1; j<= 2*h_scale*subdiv_nb; j++)
{
glVertex2f(((1/((GLfloat)w_scale*subdiv_nb))*(GLfloat)i)-1.0,((1/((GLfloat)h_scale*subdiv_nb))*(GLfloat)j)-1.0);
}
}
//second grid
glColor3f(0.0,0.8,0.0);
for(i=1; i<= 2*w_scale; i++)
{
for(j=1; j<= 2*h_scale; j++)
{
glVertex2f(((1/((GLfloat)w_scale))*(GLfloat)i)-1.0,((1/((GLfloat)h_scale))*(GLfloat)j)-1.0);
}
}
glEnd();
glBegin(GL_LINES);
glColor3f(0.0,0.8,0.0);
glVertex2f(-1.0,0.0);
glVertex2f(1.0,0.0);
glVertex2f(0.0,-1.0);
glVertex2f(0.0,1.0);
for(i=1; i<= 2*w_scale; i++)
{
glVertex2f(((1/(GLfloat)w_scale)*(GLfloat)i)-1.0,grad_size);
glVertex2f(((1/(GLfloat)w_scale)*(GLfloat)i)-1.0,-grad_size);
}
for(i=1; i<= 2*h_scale; i++)
{
glVertex2f(-grad_size,((1/(GLfloat)h_scale)*(GLfloat)i)-1.0);
glVertex2f(grad_size,((1/(GLfloat)h_scale)*(GLfloat)i)-1.0);
}
glEnd();
}
//affichage des courbes : ici c'est simplement un ensemble de sinusoides
void display_curves(int valeur)
{
int i=0;
float decalage;
decalage = (float)valeur/100;
//sinusoide pour le test
glBegin(GL_LINE_STRIP);
glColor3f(1.0,0.0,0.0);
for(i=0; i<=200; i++)
{
glVertex2f(((float)i)/100.0-1.0, cos((float)i/10.0)+decalage);
}
glEnd();
}
//fonction d'affichage principale
void display()
{
int i=0;
glClear(GL_COLOR_BUFFER_BIT);
//display_grid();
for(i=0; i<100; i++)
{
display_grid();
display_curves(i);
glutSwapBuffers();
}
}
void Reshape()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(-1,1,-1,1);
}
int WindowName;
int main(int argc, char *argv[])
{
//paramètre d'initialisation de la fenetre avec glut
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowPosition(200,200);
glutInitWindowSize(width,height);
WindowName=glutCreateWindow("ma première fenetre opengl");
//début du programme principal avec glut
//glutReshapeFunc(Reshape);
glutDisplayFunc(display);
glutMainLoop();
//fin normale
return EXIT_SUCCESS;
} |
