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MONA
12-17-2000, 06:31 PM
me and my friends have tried to compile it..
but it still doesn't work..and it got so many errors..
can someone help me..pleaseez


below is our programs :

#define NULL 0
#include <GL/glut.h>

void mouse(int, int, int, int);
void display(void);
void idle(void);
void drawSquare(int, int);
void myReshape(GLsizei, GLsizei);

void myinit(void);

void screen_box(int, int, int);
void right_menu(int);
void middle_menu(int);
void color_menu(int);
void pixel_menu(int);
void fill_menu(int);
long time(int);
int pick(int, int);

/* globals */

GLsizei wh = 500, ww = 500; /* initial window size */
GLfloat size = 3.0; /* half side length of square */

int base; /* font list base */
long baset; /*time base */
GLfloat r = 1.0, g = 1.0, b = 1.0; /* drawing color */
int fill = 0; /* fill flag */

void drawSquare(int x, int y)
//Draw randomly colored pixel withsize=2*size x 2*size

{

y=wh-y;
glColor3ub( (char) rand()%256, (char) rand()%256, (char) rand()%256);
glBegin(GL_POLYGON);
glVertex2f(x+size, y+size);
glVertex2f(x-size, y+size);
glVertex2f(x-size, y-size);
glVertex2f(x+size, y-size);
glEnd();
}


/* reshaping routine called whenever window is resized
or moved */

void myReshape(GLsizei w, GLsizei h)
{

/* adjust clipping box */

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, (GLdouble)w, 0.0, (GLdouble)h, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

/* adjust viewport and clear */

glViewport(0,0,w,h);
glClearColor (1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
display();
glFlush();

/* set global size for use by drawing routine */

ww = w;
wh = h;
}

void myinit(void)
{

/* set up a font in display list */
int i;
baset = time(0);
base = glGenLists(128);
for(i=0;i<128;i++)
{
glNewList(base+i, GL_COMPILE);
glutBitmapCharacter(GLUT_BITMAP_9_BY_15, i);
glEndList();
}
glListBase(base);

glViewport(0,0,ww,wh);

/* Pick 2D clipping window to match size of display window
This choice avoids having to scale object coordinates
each time window is resized */

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, (GLdouble) ww , 0.0, (GLdouble) wh , -1.0, 1.0);

/* set clear color to black and clear the window */

glClearColor (0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}

void mouse(int btn, int state, int x, int y)
{
static int draw_mode = 0; /* drawing mode */
static int count;
int where;
static int xp[2],yp[2];
if(btn==GLUT_LEFT_BUTTON && state==GLUT_DOWN)
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
glutIdleFunc(NULL);

where = pick(x,y);
glColor3f(r, g, b);
if(where != 0)// The user has picked up the top menu
{
count = 0;
draw_mode = where;// identify the user choice
}
else if(draw_mode == 1 && count == 0)// The user wants to draw a line
{
count = 1;
xp[0] = x;
yp[0] = y;
}
else if(draw_mode == 1 && count != 0)
{
glBegin(GL_LINES);
glVertex2i(x,wh-y);
glVertex2i(xp[0],wh-yp[0]);
glEnd();
draw_mode=0;
count=0;
}
else if(draw_mode == 2 && count == 0)
// The user wants to draw a Rectangle
{
count = 1;
xp[0] = x;
yp[0] = y;
}
else if(draw_mode == 2 && count != 0)
{
if(fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(x,wh-y);
glVertex2i(x,wh-yp[0]);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[0],wh-y);
glEnd();
draw_mode=0;
count=0;
}
else if(draw_mode == 3 && count == 0)
// The user wants to draw a Triangle
{
count = 1;
xp[0] = x;
yp[0] = y;
}
else if(draw_mode == 3 && count == 1)
{
count = 2;
xp[1] = x;
yp[1] = y;
}
else if(draw_mode == 3 && count == 2)
{
if(fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[1],wh-yp[1]);
glVertex2i(x,wh-y);
glEnd();
draw_mode=0;
count=0;
}
else if(draw_mode == 4 )// The user wants to draw a pixel
{
drawSquare(x,y);
count++;
}

glutIdleFunc(idle);
glPopAttrib();
glFlush();
}
}

int pick(int x, int y)

//Identify the mouse selection
{
y = wh - y;
if(y < wh-ww/10) return 0;
else if(x < ww/10) return 1;
else if(x < ww/5) return 2;
else if(x < 3*ww/10) return 3;
else if(x < 2*ww/5) return 4;
else return 0;
}

void screen_box(int x, int y, int s )
//Draw Top menu Boxes
{
glBegin(GL_QUADS);
glVertex2i(x, y);
glVertex2i(x+s, y);
glVertex2i(x+s, y+s);
glVertex2i(x, y+s);
glEnd();
}

void idle(void)
{

//Continually increment the the displayed time

char out[]="00:00:00";
long t, time();
int min, sec, hr;


glPushAttrib(GL_ALL_ATTRIB_BITS);

t=time(0)-baset;
hr=t/3600;
min = (t - 3600*hr) /60;
sec = (t - 3600*hr - 60*min);
hr = hr%24;
out[0]='0'+hr/10;
out[1]='0'+hr%10;
out[3]='0'+min/10;
out[4]='0'+min%10;
out[6]='0'+sec/10;
out[7]='0'+sec%10;
glRasterPos2i(ww-80, wh-15);
glColor3f(0.0,0.0,0.0);
glBegin(GL_QUADS);
glVertex2i(ww-80, wh-15);
glVertex2i(ww, wh-15);
glVertex2i(ww, wh);
glVertex2i(ww-80, wh);
glEnd();
glColor3f(1.0,1.0,1.0);
glCallLists( strlen(out) , GL_BYTE, out);
glFlush();
glPopAttrib();
}

void right_menu(int id)
{
glutIdleFunc(NULL);
if(id == 1) exit(0);
else display();
glutIdleFunc(idle);
}


void color_menu(int id)
{
glutIdleFunc(NULL);
if(id == 1) {r = 1.0; g = 0.0; b = 0.0;}
else if(id == 2) {r = 0.0; g = 1.0; b = 0.0;}
else if(id == 3) {r = 0.0; g = 0.0; b = 1.0;}
else if(id == 4) {r = 0.0; g = 1.0; b = 1.0;}
else if(id == 5) {r = 1.0; g = 0.0; b = 1.0;}
else if(id == 6) {r = 1.0; g = 1.0; b = 0.0;}
else if(id == 7) {r = 1.0; g = 1.0; b = 1.0;}
else if(id == 8) {r = 0.0; g = 0.0; b = 0.0;}
glutIdleFunc(idle);
}


void pixel_menu(int id)
{
glutIdleFunc(NULL);
if (id == 1) size = 2 * size;
else if (size > 1) size = size/2;
glutIdleFunc(idle);
}

void fill_menu(int id)
{
glutIdleFunc(NULL);
if (id == 1) fill = 1;
else fill = 0;
glutIdleFunc(idle);
}

void display(void)
{
//Save the current values of all the attributes

glPushAttrib(GL_ALL_ATTRIB_BITS);

//Disactivate Idle function
glutIdleFunc(NULL);


//Set the background color and initialise the frame buffer
glClearColor (0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);

//Draw the User Interface

glColor3f(1.0, 1.0, 1.0);
screen_box(0,wh-ww/10,ww/10);
glColor3f(1.0, 0.0, 0.0);
screen_box(ww/10,wh-ww/10,ww/10);
glColor3f(0.0, 1.0, 0.0);
screen_box(ww/5,wh-ww/10,ww/10);
glColor3f(0.0, 0.0, 1.0);
screen_box(3*ww/10,wh-ww/10,ww/10);
glColor3f(1.0, 1.0, 0.0);
screen_box(ww/10+ww/40,wh-ww/10+ww/40,ww/20);
glBegin(GL_LINES);
glVertex2i(wh/40,wh-ww/20);
glVertex2i(wh/40+ww/20,wh-ww/20);
glEnd();
glBegin(GL_TRIANGLES);
glVertex2i(ww/5+ww/40,wh-ww/10+ww/40);
glVertex2i(ww/5+ww/20,wh-ww/40);
glVertex2i(ww/5+3*ww/40,wh-ww/10+ww/40);
glEnd();
glPointSize(3.0);
glBegin(GL_POINTS);
glVertex2i(3*ww/10+ww/20, wh-ww/20);
glEnd();

//Reactivate the Idle Function
glutIdleFunc(idle);

//Execute the instructions and get back the previous values of the attributes
glFlush();
glPopAttrib();
}


int main(int argc, char** argv)
{
int c_menu, p_menu, f_menu;

glutInit(&argc,argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutCreateWindow("square");

//Define The Menu

c_menu = glutCreateMenu(color_menu);
glutAddMenuEntry("Red",1);
glutAddMenuEntry("Green",2);
glutAddMenuEntry("Blue",3);
glutAddMenuEntry("Cyan",4);
glutAddMenuEntry("Magenta",5);
glutAddMenuEntry("Yellow",6);
glutAddMenuEntry("White",7);
glutAddMenuEntry("Black",8);
p_menu = glutCreateMenu(pixel_menu);
glutAddMenuEntry("increase pixel size", 1);
glutAddMenuEntry("decrease pixel size", 2);
f_menu = glutCreateMenu(fill_menu);
glutAddMenuEntry("fill on", 1);
glutAddMenuEntry("fill off", 2);
glutCreateMenu(right_menu);
glutAddMenuEntry("quit",1);
glutAddMenuEntry("clear",2);
glutAddSubMenu("Colors", c_menu);
glutAddSubMenu("Pixel Size", p_menu);
glutAddSubMenu("Fill", f_menu);
glutAttachMenu(GLUT_RIGHT_BUTTON);

//Call Initialisation Function

myinit ();

//Callback function Registration

glutDisplayFunc(display);
glutReshapeFunc (myReshape);
glutMouseFunc (mouse);
glutIdleFunc(idle);

//Event-processing Function

glutMainLoop();

}

DPalomo
12-17-2000, 11:54 PM
I've compiled your code, a few pointers:
- You need to link glut, glu and opengl libraries (for visual c++ glut32.lib, glu32.lib and opengl32.lib)
- Every change I made I've marked with '// @@@'
- I saw you declaring at the top of the file a function 'long time();' and also in an another function, 'long t, time();' but if yu don't define the body of the funtion it will not do anything, and also it will not compile. I think you meant 'time_t()' from time.h .
Below is the altered (working/compiling) code.

Hope this helps,

Daniel Palomo van Es.



#define NULL 0
#include <GL/glut.h>
#include <stdlib.h>// @@@ needed to use rand()
#include <time.h>// @@@ needed to use time_t()
#include <string.h>// @@@ needed to use strlen

void mouse(int, int, int, int);
void display(void);
void idle(void);
void drawSquare(int, int);
void myReshape(GLsizei, GLsizei);

void myinit(void);

void screen_box(int, int, int);
void right_menu(int);
void middle_menu(int);
void color_menu(int);
void pixel_menu(int);
void fill_menu(int);
//long time(int); //@@@ You can't declare a function time() and not define it
int pick(int, int);

/* globals */

GLsizei wh = 500, ww = 500; /* initial window size */
GLfloat size = 3.0; /* half side length of square */

int base; /* font list base */
long baset; /*time base */
GLfloat r = 1.0, g = 1.0, b = 1.0; /* drawing color */
int fill = 0; /* fill flag */

void drawSquare(int x, int y){
//Draw randomly colored pixel withsize=2*size x 2*size

y=wh-y;
glColor3ub( (char) rand()%256, (char) rand()%256, (char) rand()%256);
glBegin(GL_POLYGON);
glVertex2f(x+size, y+size);
glVertex2f(x-size, y+size);
glVertex2f(x-size, y-size);
glVertex2f(x+size, y-size);
glEnd();
}


/* reshaping routine called whenever window is resized
or moved */

void myReshape(GLsizei w, GLsizei h) {

/* adjust clipping box */

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, (GLdouble)w, 0.0, (GLdouble)h, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

/* adjust viewport and clear */

glViewport(0,0,w,h);
glClearColor (1.0, 1.0, 1.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
display();
glFlush();

/* set global size for use by drawing routine */

ww = w;
wh = h;
}

void myinit(void) {

/* set up a font in display list */
int i;
baset = time(0);
base = glGenLists(128);
for (i=0;i<128;i++) {
glNewList(base+i, GL_COMPILE);
glutBitmapCharacter(GLUT_BITMAP_9_BY_15, i);
glEndList();
}
glListBase(base);

glViewport(0,0,ww,wh);

/* Pick 2D clipping window to match size of display window
This choice avoids having to scale object coordinates
each time window is resized */

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, (GLdouble) ww , 0.0, (GLdouble) wh , -1.0, 1.0);

/* set clear color to black and clear the window */

glClearColor (0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);
glFlush();
}

void mouse(int btn, int state, int x, int y) {
static int draw_mode = 0; /* drawing mode */
static int count;
int where;
static int xp[2],yp[2];
if (btn==GLUT_LEFT_BUTTON &amp;&amp; state==GLUT_DOWN) {
glPushAttrib(GL_ALL_ATTRIB_BITS);
glutIdleFunc(NULL);

where = pick(x,y);
glColor3f(r, g, b);
if (where != 0) {// The user has picked up the top menu
count = 0;
draw_mode = where;// identify the user choice
}
else if (draw_mode == 1 &amp;&amp; count == 0) {// The user wants to draw a line
count = 1;
xp[0] = x;
yp[0] = y;
}
else if (draw_mode == 1 &amp;&amp; count != 0) {
glBegin(GL_LINES);
glVertex2i(x,wh-y);
glVertex2i(xp[0],wh-yp[0]);
glEnd();
draw_mode=0;
count=0;
}
else if (draw_mode == 2 &amp;&amp; count == 0)
// The user wants to draw a Rectangle
{
count = 1;
xp[0] = x;
yp[0] = y;
}
else if (draw_mode == 2 &amp;&amp; count != 0) {
if (fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(x,wh-y);
glVertex2i(x,wh-yp[0]);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[0],wh-y);
glEnd();
draw_mode=0;
count=0;
}
else if (draw_mode == 3 &amp;&amp; count == 0)
// The user wants to draw a Triangle
{
count = 1;
xp[0] = x;
yp[0] = y;
}
else if (draw_mode == 3 &amp;&amp; count == 1) {
count = 2;
xp[1] = x;
yp[1] = y;
}
else if (draw_mode == 3 &amp;&amp; count == 2) {
if (fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[1],wh-yp[1]);
glVertex2i(x,wh-y);
glEnd();
draw_mode=0;
count=0;
}
else if (draw_mode == 4 ) {// The user wants to draw a pixel
drawSquare(x,y);
count++;
}

glutIdleFunc(idle);
glPopAttrib();
glFlush();
}
}

int pick(int x, int y){

//Identify the mouse selection
y = wh - y;
if (y < wh-ww/10) return 0;
else if (x < ww/10) return 1;
else if (x < ww/5) return 2;
else if (x < 3*ww/10) return 3;
else if (x < 2*ww/5) return 4;
else return 0;
}

void screen_box(int x, int y, int s ) {
//Draw Top menu Boxes
glBegin(GL_QUADS);
glVertex2i(x, y);
glVertex2i(x+s, y);
glVertex2i(x+s, y+s);
glVertex2i(x, y+s);
glEnd();
}

void idle(void) {

//Continually increment the the displayed time

char out[]="00:00:00";
long t, time;//@@@ time() ?? we use time_t() is an existing function
int min, sec, hr;


glPushAttrib(GL_ALL_ATTRIB_BITS);

t=time_t()-baset;
hr=t/3600;
min = (t - 3600*hr) /60;
sec = (t - 3600*hr - 60*min);
hr = hr%24;
out[0]='0'+hr/10;
out[1]='0'+hr%10;
out[3]='0'+min/10;
out[4]='0'+min%10;
out[6]='0'+sec/10;
out[7]='0'+sec%10;
glRasterPos2i(ww-80, wh-15);
glColor3f(0.0,0.0,0.0);
glBegin(GL_QUADS);
glVertex2i(ww-80, wh-15);
glVertex2i(ww, wh-15);
glVertex2i(ww, wh);
glVertex2i(ww-80, wh);
glEnd();
glColor3f(1.0,1.0,1.0);
glCallLists( strlen(out) , GL_BYTE, out);
glFlush();
glPopAttrib();
}

void right_menu(int id) {
glutIdleFunc(NULL);
if (id == 1) exit(0);
else display();
glutIdleFunc(idle);
}


void color_menu(int id) {
glutIdleFunc(NULL);
if (id == 1) {
r = 1.0; g = 0.0; b = 0.0;
}
else if (id == 2) {
r = 0.0; g = 1.0; b = 0.0;
}
else if (id == 3) {
r = 0.0; g = 0.0; b = 1.0;
}
else if (id == 4) {
r = 0.0; g = 1.0; b = 1.0;
}
else if (id == 5) {
r = 1.0; g = 0.0; b = 1.0;
}
else if (id == 6) {
r = 1.0; g = 1.0; b = 0.0;
}
else if (id == 7) {
r = 1.0; g = 1.0; b = 1.0;
}
else if (id == 8) {
r = 0.0; g = 0.0; b = 0.0;
}
glutIdleFunc(idle);
}


void pixel_menu(int id) {
glutIdleFunc(NULL);
if (id == 1) size = 2 * size;
else if (size > 1) size = size/2;
glutIdleFunc(idle);
}

void fill_menu(int id) {
glutIdleFunc(NULL);
if (id == 1) fill = 1;
else fill = 0;
glutIdleFunc(idle);
}

void display(void) {
//Save the current values of all the attributes

glPushAttrib(GL_ALL_ATTRIB_BITS);

//Disactivate Idle function
glutIdleFunc(NULL);


//Set the background color and initialise the frame buffer
glClearColor (0.0, 0.0, 0.0, 1.0);
glClear(GL_COLOR_BUFFER_BIT);

//Draw the User Interface

glColor3f(1.0, 1.0, 1.0);
screen_box(0,wh-ww/10,ww/10);
glColor3f(1.0, 0.0, 0.0);
screen_box(ww/10,wh-ww/10,ww/10);
glColor3f(0.0, 1.0, 0.0);
screen_box(ww/5,wh-ww/10,ww/10);
glColor3f(0.0, 0.0, 1.0);
screen_box(3*ww/10,wh-ww/10,ww/10);
glColor3f(1.0, 1.0, 0.0);
screen_box(ww/10+ww/40,wh-ww/10+ww/40,ww/20);
glBegin(GL_LINES);
glVertex2i(wh/40,wh-ww/20);
glVertex2i(wh/40+ww/20,wh-ww/20);
glEnd();
glBegin(GL_TRIANGLES);
glVertex2i(ww/5+ww/40,wh-ww/10+ww/40);
glVertex2i(ww/5+ww/20,wh-ww/40);
glVertex2i(ww/5+3*ww/40,wh-ww/10+ww/40);
glEnd();
glPointSize(3.0);
glBegin(GL_POINTS);
glVertex2i(3*ww/10+ww/20, wh-ww/20);
glEnd();

//Reactivate the Idle Function
glutIdleFunc(idle);

//Execute the instructions and get back the previous values of the attributes
glFlush();
glPopAttrib();
}


int main(int argc, char** argv) {
int c_menu, p_menu, f_menu;

glutInit(&amp;argc,argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutCreateWindow("square");

//Define The Menu

c_menu = glutCreateMenu(color_menu);
glutAddMenuEntry("Red",1);
glutAddMenuEntry("Green",2);
glutAddMenuEntry("Blue",3);
glutAddMenuEntry("Cyan",4);
glutAddMenuEntry("Magenta",5);
glutAddMenuEntry("Yellow",6);
glutAddMenuEntry("White",7);
glutAddMenuEntry("Black",8);
p_menu = glutCreateMenu(pixel_menu);
glutAddMenuEntry("increase pixel size", 1);
glutAddMenuEntry("decrease pixel size", 2);
f_menu = glutCreateMenu(fill_menu);
glutAddMenuEntry("fill on", 1);
glutAddMenuEntry("fill off", 2);
glutCreateMenu(right_menu);
glutAddMenuEntry("quit",1);
glutAddMenuEntry("clear",2);
glutAddSubMenu("Colors", c_menu);
glutAddSubMenu("Pixel Size", p_menu);
glutAddSubMenu("Fill", f_menu);
glutAttachMenu(GLUT_RIGHT_BUTTON);

//Call Initialisation Function

myinit ();

//Callback function Registration

glutDisplayFunc(display);
glutReshapeFunc (myReshape);
glutMouseFunc (mouse);
glutIdleFunc(idle);

//Event-processing Function

glutMainLoop();

}