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#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <GL/glut.h>
#define N 5
#define STEP 0.001f
int valuesA[N] = { 1, 2, 3, 4, 5 };
int valuesB[N] = { 6, 7, 8, 9, 10 };
int valuesC[N] = { 11, 12, 13, 14, 15 };
int valuesD[N] = { 16, 17, 18, 19, 20 };
int width, height;
int verbose = 0;
float Couleurs[N][3] =
{
{ 1, 0, 0 },
{ 0, 1, 0 },
{ 0, 0, 1 },
{ 1, 1, 0 },
{ 0, 1, 1 }
};
char *NomCouleur[N] =
{
"rouge", "vert", "bleu", "jaune", "turquoise"
};
float FonctionABCD( float u, int a, int b, int c, int d )
{
return a * u*u*u + b * u*u + c * u + d;
}
void PrintArray( char *name, int n, int *array)
{
int i;
printf("%s = [ ", name);
for( i = 0 ; i < N ; i++ )
{
printf("%2d", array[i] );
if( i < N - 1 )
{
printf(", ");
}
}
printf(" ]\n");
}
void ReshapeFunc(int w, int h)
{
//Tell OpenGL how to convert from coordinates to pixel values
glViewport(0, 0, w, h);
width = w;
height = h;
//Switch to setting the camera perspective
glMatrixMode(GL_PROJECTION);
//Set the camera perspective
glLoadIdentity();
//Reset the camera
// gluPerspective( 45.0, (double)w / (double)h, 1.0, 200.0);
glOrtho(-1,1,-1,1,-10,10);
}
void KeyboardFunc(unsigned char key,int x, int y)
{
switch (key)
{
case 27: /* ESC = Quit */
case 'Q':
case 'q':
exit(0);
break;
}
glutPostRedisplay();
}
void DisplayFunc()
{
int i;
float u, v;
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glTranslatef(-1.0f, -1.0f, 0.0f);
glScalef(2.0f, 0.02f, 1.0f);
for (i = 0 ; i < N ; i++ )
{
printf("\nSX(%d) = %s \n", i + 1, NomCouleur[i] );
glBegin(GL_LINES);
glColor3fv( &Couleurs[i][0] );
for( u = 0.0f ; u <= 1.000f ; u += STEP )
{
v = FonctionABCD(u, valuesA[i], valuesB[i], valuesC[i], valuesD[i]);
glVertex2f(u, v);
}
glEnd();
}
glPopMatrix();
glutSwapBuffers();
}
int main(int argc, char **argv )
{
printf("Courbe parametrique multiple SX(1..%d) = a*u^3 + b*u^2 +c*u + d avec (a,b,c,d) comme paramêtres et u variant de 0 à 1 par pas de %.3f \n\n", N, STEP);
PrintArray("a", N, valuesA );
PrintArray("b", N, valuesB );
PrintArray("c", N, valuesC );
PrintArray("d", N, valuesD );
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow("Courbe parametrique multiple");
glutDisplayFunc(DisplayFunc);
glutReshapeFunc(ReshapeFunc);
glutKeyboardFunc(KeyboardFunc);
glutMainLoop();
return 0;
} |
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