View difference between Paste ID: RTrNKGek and JkwgSrBF

 
 /*  curbe_Bezier.c
  *
  Programul utilizeaza evaluatorii pentru determinarea
  punctelor de pe curba Bezier
  */
 #include "glos.h"
 
 #include <GL/gl.h>
 #include <glu.h>
 #include <glaux.h>
 
 void myinit(void);
 void CALLBACK myReshape(GLsizei w, GLsizei h);
 void CALLBACK display(void);
 #define nr_puncte 4
 
 GLfloat ctrlpoints[nr_puncte][3] = {
 	//sunt date coordonatele celor 4 puncte de control
     { -4.0, 0.0, 0.0}, { -3.0, 2.0, 0.0},
 	{-1.0, 2.0, 0.0}, {0.0,0.0,0}  };
 
 GLfloat ctrlpoints2[nr_puncte][3] = {
 	//sunt date coordonatele celor 4 puncte de control
     { 0.0, 0.0, 0.0}, { 1.0, -2.0, 0.0},
 	{3.0, -2.0, 0.0}, {4.0,0.0,0}  };
 
 
 
 void myinit(void)
 {
     glClearColor(1.0, 1.0, 1.0, 1.0); //culoarea background-ului
 
 /*functia defineste caracteristicile curbei:
 -tipul punctelor de control date in vectorul ctrlpoints, si al
 datelor de iesire generate de functia de evaluare glEvalCoord1f
 -valorile extreme luate de parametrul u (0 si 1 in acst caz)
 -numarul coordonatelor date pentru fiecare punct de control, in tabloul
 ctrlpoints
 -numarul punctelor de control pe baza carora se va determina ordinul curbei
 (numar puncte-1)
 -vectorul punctelor de control
    */
 
     glEnable(GL_MAP1_VERTEX_3);	//se valideaza un anumit tip de evaluare
     glShadeModel(GL_FLAT); 	//umbrire constanta pe poligoane
 	glLineStipple (1, 0x0F0F);
 }
 
 void CALLBACK display(void)
 {
     int i;
 
     glClear(GL_COLOR_BUFFER_BIT);
     glColor3f(0.0, 0.0, 0.0);
 glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &ctrlpoints[0][0]);	//culoarea curenta de desenare
     glBegin(GL_LINE_STRIP);		//se deseneaza curba prin segmente de dreapta
     for (i = 0; i <= 30; i++)
         glEvalCoord1f((GLfloat) i/30.0); //pentru cele 30 varfuri determinate de
 								// functia glEvalCoord1f
     glEnd();
 
 	glMap1f(GL_MAP1_VERTEX_3, 0.0, 1.0, 3, 4, &ctrlpoints2[0][0]);	//culoarea curenta de desenare
     glBegin(GL_LINE_STRIP);		//se deseneaza curba prin segmente de dreapta
     for (i = 0; i <= 30; i++)
         glEvalCoord1f((GLfloat) i/30.0); //pentru cele 30 varfuri determinate de
 								// functia glEvalCoord1f
     glEnd();
 
 	/* Se afiseaza punctele de control. */
     glPointSize(5.0);	// de dimensiune 5
     glColor3f(1.0, 0.0, 0.0);	// culoare rosie
     glBegin(GL_POINTS);
     for (i = 0; i < nr_puncte; i++)
         glVertex3fv(&ctrlpoints[i][0]);
     glEnd();
 
 
 
 	//poligonul caracteristic ?
 
 
 	glEnable(GL_LINE_STIPPLE);
 	glColor3f(1.0, 0.0, 1.0);
 	glBegin (GL_LINE_STRIP);
 	for (i=0; i<nr_puncte; i++)
 		glVertex3fv(&ctrlpoints2[i][0]);
 	glEnd();
 	 glPointSize(5.0);	// de dimensiune 5
     glColor3f(1.0, 0.0, 0.0);	// culoare rosie
     glBegin(GL_POINTS);
     for (i = 0; i < nr_puncte; i++)
         glVertex3fv(&ctrlpoints2[i][0]);
     glEnd();
 
 
 
 	//poligonul caracteristic ?
 	glEnable(GL_LINE_STIPPLE);
 	glColor3f(1.0, 0.0, 1.0);
 	glBegin (GL_LINE_STRIP);
 	for (i=0; i<nr_puncte; i++)
 		glVertex3fv(&ctrlpoints2[i][0]);
 	glEnd();
 
     glFlush();
 }
 
 void CALLBACK myReshape(GLsizei w, GLsizei h)
 {
     if (!h) return;
     glViewport(0, 0, w, h);
     glMatrixMode(GL_PROJECTION);
     glLoadIdentity();
     if (w <= h)
     glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w,
         5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);
     else
     glOrtho(-5.0*(GLfloat)w/(GLfloat)h,
         5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);
     glMatrixMode(GL_MODELVIEW);
     glLoadIdentity();
 }
 
 int main(int argc, char** argv)
 {
     auxInitDisplayMode (AUX_SINGLE | AUX_RGB);
     auxInitPosition (0, 0, 500, 500);
     auxInitWindow ("Curbe Bezier");
     myinit();
     auxReshapeFunc (myReshape);
     auxMainLoop(display);
     return(0);
 }