Le source: RemplissageFacette2D.cpp
#include <windows.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include <GL/glaux.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
float anglex = 0.0F ;
float angley = 0.0F ;
float anglez = 0.0F ;
int aff = 0 ;
int yy = 0 ;
void ligne(int xi,int yi,int xf,int yf,int *px) {
int i,cumul ;
int x = xi ;
int y = yi ;
int dx = xf - xi ;
int dy = yf - yi ;
int xinc = ( dx > 0 ) ? 1 : -1 ;
int yinc = ( dy > 0 ) ? 1 : -1 ;
dx = abs(dx) ;
dy = abs(dy) ;
px[y] = x ;
if ( dx > dy ) {
cumul = dx / 2 ;
for ( i = 1 ; i <= dx ; i++ ) {
x += xinc ;
cumul += dy ;
if (cumul >= dx) {
cumul -= dx ;
y += yinc ; }
px[y] = x ; } }
else {
cumul = dy / 2 ;
for ( i = 1 ; i <= dy ; i++ ) {
y += yinc ;
cumul += dx ;
if ( cumul >= dy ) {
cumul -= dy ;
x += xinc ; }
px[y] = x ; } }
}
void ligneCote(int xi,int yi,int xf,int yf,int *px) {
if ( xi > xf )
ligne(xf,yf,xi,yi,px) ;
else
ligne(xi,yi,xf,yf,px) ;
}
void axes() {
float rouge[] = { 1.0F,1.0F,0.0F,1.0F };
glColor4fv(rouge) ;
glBegin(GL_LINES) ;
glVertex3f(0.0F,0.0F,0.0F) ;
glVertex3f(20.0F,0.0F,0.0F) ;
glEnd() ;
float vert[] = { 0.0F,1.0F,1.0F,1.0F };
glColor4fv(vert) ;
glBegin(GL_LINES) ;
glVertex3f(0.0F,0.0F,0.0F) ;
glVertex3f(0.0F,20.0F,0.0F) ;
glEnd() ;
float bleu[] = { 0.0F,0.0F,1.0F,1.0F };
glColor4fv(bleu) ;
glBegin(GL_LINES) ;
glVertex3f(0.0F,0.0F,0.0F) ;
glVertex3f(0.0F,0.0F,20.0F) ;
glEnd() ;
}
void CALLBACK init() {
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glShadeModel(GL_SMOOTH);
glClearColor(0.8F,0.8F,0.8F,1.0F);
}
void Facette(float *coul,float *p1,float *p2,float *p3) {
glPushMatrix() ;
glColor4fv(coul) ;
glBegin(GL_TRIANGLES) ;
glVertex3fv(p1) ;
glVertex3fv(p2) ;
glVertex3fv(p3) ;
glEnd() ;
float noir[] = { 0.0F,0.0F,0.0F } ;
glColor3fv(noir) ;
glLineWidth(1.0) ;
glBegin(GL_LINE_LOOP) ;
glVertex3fv(p1) ;
glVertex3fv(p2) ;
glVertex3fv(p3) ;
glEnd() ;
glLineWidth(1.0) ;
glPopMatrix() ;
}
void Pixel(int x, int y) {
glBegin(GL_QUADS) ;
glVertex2f(2*x-30.0F,2*y-30.0F) ;
glVertex2f(2*x-28.0F,2*y-30.0F) ;
glVertex2f(2*x-28.0F,2*y-28.0F) ;
glVertex2f(2*x-30.0F,2*y-28.0F) ;
glEnd() ;
}
void LigneDiscrete(int y,int x1,int x2) {
if ( x2 != -100 ) {
int i ;
int x = x1 ;
int dx = x2 - x1 ;
int xinc = ( dx > 0 ) ? 1 : -1 ;
dx = abs(dx) ;
Pixel(x,y) ;
for ( i = 1 ; i <= dx ; i++ ) {
x += xinc ;
Pixel(x,y) ; } }
}
void echange(float *p1,float *p2) {
float aux = *p1 ;
*p1 = *p2 ;
*p2 = aux ;
}
void echangeSommet(float *p1,float *p2) {
if ( p1[1] > p2[1] ) {
echange(&p1[0],&p2[0]) ;
echange(&p1[1],&p2[1]) ; }
}
void FacetteDiscrete(float *coul,float *p1,float *p2,float *p3) {
glColor4fv(coul) ;
glPushMatrix() ;
int px1[30] ;
int px2[30] ;
int px3[30] ;
for ( int i = 0 ; i < 30 ; i++ )
px1[i] = px2[i] = px3[i] = -100 ;
ligneCote((int) (p1[0]+30)/2,(int) (p1[1]+30)/2,(int) (p2[0]+30)/2,(int) (p2[1]+30)/2,px1) ;
ligneCote((int) (p1[0]+30)/2,(int) (p1[1]+30)/2,(int) (p3[0]+30)/2,(int) (p3[1]+30)/2,px2) ;
ligneCote((int) (p2[0]+30)/2,(int) (p2[1]+30)/2,(int) (p3[0]+30)/2,(int) (p3[1]+30)/2,px3) ;
int x1[30] ;
int x2[30] ;
for ( i = 0 ; i < 30 ; i++ )
x1[i] = x2[i] = -100 ;
for ( i = 0 ; i < 30 ; i++ ) {
if ( px1[i] > x1[i] )
x1[i] = px1[i] ;
if ( px2[i] > x1[i] )
x1[i] = px2[i] ;
if ( px3[i] > x1[i] )
x1[i] = px3[i] ; }
for ( i = 0 ; i < 30 ; i++ )
x2[i] = x1[i] ;
for ( i = 0 ; i < 30 ; i++ ) {
if ( ( px1[i] <= x2[i] ) && ( px1[i] != -100 ) )
x2[i] = px1[i] ;
if ( ( px2[i] <= x2[i] ) && ( px2[i] != -100 ) )
x2[i] = px2[i] ;
if ( ( px3[i] <= x2[i] ) && ( px3[i] != -100 ) )
x2[i] = px3[i] ; }
for ( int y = 0 ; y < 30 ; y++ )
LigneDiscrete(y,x2[y],x1[y]) ;
glPopMatrix() ;
}
void lignePixels(int xi,int yi,int xf,int yf) {
int i,cumul ;
int x = xi ;
int y = yi ;
int dx = xf - xi ;
int dy = yf - yi ;
int xinc = ( dx > 0 ) ? 1 : -1 ;
int yinc = ( dy > 0 ) ? 1 : -1 ;
dx = abs(dx) ;
dy = abs(dy) ;
Pixel(x,y) ;
if ( dx > dy ) {
cumul = dx / 2 ;
for ( i = 1 ; i <= dx ; i++ ) {
x += xinc ;
cumul += dy ;
if (cumul >= dx) {
cumul -= dx ;
y += yinc ; }
Pixel(x,y) ; } }
else {
cumul = dy / 2 ;
for ( i = 1 ; i <= dy ; i++ ) {
y += yinc ;
cumul += dx ;
if ( cumul >= dy ) {
cumul -= dy ;
x += xinc ; }
Pixel(x,y) ; } }
}
void CoteFacette(float *coul,float *p1,float *p2) {
glColor4fv(coul) ;
glPushMatrix() ;
if ( p2[1] > p1[1] )
lignePixels((int) (p1[0]+30)/2,(int) (p1[1]+30)/2,(int) (p2[0]+30)/2,(int) (p2[1]+30)/2) ;
else
lignePixels((int) (p2[0]+30)/2,(int) (p2[1]+30)/2,(int) (p1[0]+30)/2,(int) (p1[1]+30)/2) ;
glPopMatrix() ;
}
void FacetteDiscreteTrame(float *coul,float *c,float *cc,float *p1,float *p2,float *p3,int yy) {
glColor4fv(coul) ;
glPushMatrix() ;
int px1[30] ;
int px2[30] ;
int px3[30] ;
for ( int i = 0 ; i < 30 ; i++ )
px1[i] = px2[i] = px3[i] = -100 ;
ligneCote((int) (p1[0]+30)/2,(int) (p1[1]+30)/2,(int) (p2[0]+30)/2,(int) (p2[1]+30)/2,px1) ;
ligneCote((int) (p1[0]+30)/2,(int) (p1[1]+30)/2,(int) (p3[0]+30)/2,(int) (p3[1]+30)/2,px2) ;
ligneCote((int) (p2[0]+30)/2,(int) (p2[1]+30)/2,(int) (p3[0]+30)/2,(int) (p3[1]+30)/2,px3) ;
int x1[30] ;
int x2[30] ;
for ( i = 0 ; i < 30 ; i++ )
x1[i] = x2[i] = -100 ;
for ( i = 0 ; i < 30 ; i++ ) {
if ( px1[i] > x1[i] )
x1[i] = px1[i] ;
if ( px2[i] > x1[i] )
x1[i] = px2[i] ;
if ( px3[i] > x1[i] )
x1[i] = px3[i] ; }
for ( i = 0 ; i < 30 ; i++ )
x2[i] = x1[i] ;
for ( i = 0 ; i < 30 ; i++ ) {
if ( ( px1[i] <= x2[i] ) && ( px1[i] != -100 ) )
x2[i] = px1[i] ;
if ( ( px2[i] <= x2[i] ) && ( px2[i] != -100 ) )
x2[i] = px2[i] ;
if ( ( px3[i] <= x2[i] ) && ( px3[i] != -100 ) )
x2[i] = px3[i] ; }
for ( int y = 0 ; y <= yy-1 ; y++ )
LigneDiscrete(y,x2[y],x1[y]) ;
glColor4fv(c) ;
LigneDiscrete(yy,x2[y],x1[y]) ;
CoteFacette(cc,p1,p2) ;
CoteFacette(cc,p1,p3) ;
CoteFacette(cc,p2,p3) ;
glPopMatrix() ;
}
void CotesFacette(float *coul1,float *p1,float *coul2,float *p2,float *coul3,float *p3) {
CoteFacette(coul1,p1,p2) ;
CoteFacette(coul2,p1,p3) ;
CoteFacette(coul3,p2,p3) ;
}
void CALLBACK display() {
float rouge[] = { 1.0F,0.0F,0.0F,1.0F };
float vert[] = { 0.0F,1.0F,0.0F,1.0F };
float bleu[] = { 0.0F,0.0F,1.0F,1.0F };
float f11[] = { -25.0F,-25.0F } ;
float f12[] = { -20.0F,20.0F } ;
float f13[] = { 25.0F,5.0F } ;
echangeSommet(f11,f12) ;
echangeSommet(f12,f13) ;
echangeSommet(f11,f12) ;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(anglex,1.0F,0.0F,0.0F) ;
glRotatef(angley,0.0F,1.0F,0.0F) ;
glRotatef(anglez,0.0F,0.0F,1.0F) ;
glPushMatrix();
switch (aff) {
case 0 : Facette(rouge,f11,f12,f13) ;
break ;
case 1 : CoteFacette(rouge,f11,f12) ;
break ;
case 2 : CoteFacette(vert,f11,f13) ;
break ;
case 3 : CoteFacette(bleu,f12,f13) ;
break ;
case 4 : CotesFacette(rouge,f11,vert,f12,bleu,f13) ;
break ;
case 5 : FacetteDiscreteTrame(rouge,bleu,vert,f11,f12,f13,yy) ;
break ;
case 6 : FacetteDiscrete(rouge,f11,f12,f13) ;
break ; }
glPopMatrix();
glPushMatrix();
axes() ;
glPopMatrix();
glPopMatrix();
glFlush();
auxSwapBuffers() ;
}
void CALLBACK reshape(int w,int h) {
glViewport(0,0,w,h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if( w <= h)
glOrtho(-30.0,30.0,-30.0*(double) h/w,30.0*(double) h/w,-40.0,40.0);
else
glOrtho(-30.0*(double) h/w,30.0*(double) h/w,-30.0,30.0,-40.0,40.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void CALLBACK auxKeyLeft() {
angley-=2 ;
}
void CALLBACK auxKeyRight() {
angley+=2 ;
}
void CALLBACK auxKeyUp() {
anglex-=2 ;
}
void CALLBACK auxKeyDown() {
anglex+=2 ;
}
void CALLBACK auxKeyz() {
anglez+=2 ;
}
void CALLBACK auxKeyZ() {
anglez-=2 ;
}
void CALLBACK auxKeyReturn() {
yy = 0 ;
aff++ ;
if ( aff == 7 )
aff = 0 ;
}
void CALLBACK auxKeySpace() {
yy++ ;
if ( yy == 30 )
yy = 0 ;
}
void main(void) {
auxInitDisplayMode(AUX_DOUBLE|AUX_RGBA|AUX_DEPTH);
auxInitPosition (0,0,300,300);
auxInitWindow("Remplissage d'une facette 2D") ;
init();
auxKeyFunc(AUX_RETURN,auxKeyReturn) ;
auxKeyFunc(AUX_SPACE,auxKeySpace) ;
auxKeyFunc(AUX_UP,auxKeyUp) ;
auxKeyFunc(AUX_DOWN,auxKeyDown) ;
auxKeyFunc(AUX_RIGHT,auxKeyRight) ;
auxKeyFunc(AUX_LEFT,auxKeyLeft) ;
auxKeyFunc(AUX_z,auxKeyz) ;
auxKeyFunc(AUX_Z,auxKeyZ) ;
auxReshapeFunc(reshape);
auxMainLoop(display);
}
RETOUR