سوال: مشکل درتابع gluBeginCurve از کتابخانه opengl [بایگانی]

abasfar

چهارشنبه 23 شهریور 1390, 23:28 عصر

دوستان ممنون از یاری سبزتان:لبخند:

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <GL/glut.h>

#define BUFSIZE 512

#define TORUS 1
#define TETRAHEDRON 2
#define ICOSAHEDRON 3

GLuint selectBuf[BUFSIZE];

int W = 500, H = 500;
GLfloat x, y;
int locating = 0;
int theObject = 0;
int menu_inuse = 0;
int mouse_state = 0;

char *objectNames[] =
{"Nothing", "Torus", "Tetrahedron", "Icosahedron"};

void
output(GLfloat x, GLfloat y, char *format,...)
{
va_list args;
char buffer[200], *p;

va_start(args, format);
vsprintf(buffer, format, args);
va_end(args);
glPushMatrix();
glTranslatef(x, y, 0);
for (p = buffer; *p; p++)
glutStrokeCharacter(GLUT_STROKE_ROMAN, *p);
glPopMatrix();
}

/* Initialize material property and light source. */
void
myinit(void)
{
GLfloat light_ambient[] =
{0.2, 0.2, 0.2, 1.0};
GLfloat light_diffuse[] =
{1.0, 1.0, 1.0, 1.0};
GLfloat light_specular[] =
{1.0, 1.0, 1.0, 1.0};
GLfloat light_position[] =
{1.0, 1.0, 1.0, 0.0};

glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);

glEnable(GL_LIGHT0);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);

glSelectBuffer(BUFSIZE, selectBuf);

glNewList(TORUS, GL_COMPILE);
glutSolidTorus(0.275, 0.85, 10, 15);
glEndList();
glNewList(TETRAHEDRON, GL_COMPILE);
glutSolidTetrahedron();
glEndList();
glNewList(ICOSAHEDRON, GL_COMPILE);
glutSolidIcosahedron();
glEndList();
}

void
highlightBegin(void)
{
static GLfloat red[4] =
{1.0, 0.0, 0.0, 1.0};

glPushAttrib(GL_LIGHTING_BIT | GL_CURRENT_BIT);
glMaterialfv(GL_FRONT, GL_DIFFUSE, red);
glColor3f(1.0, 0.0, 0.0);
}

void
highlightEnd(void)
{
glPopAttrib();
}

void
draw(void)
{
glPushMatrix();
glScalef(1.3, 1.3, 1.3);
glRotatef(20.0, 1.0, 0.0, 0.0);

glLoadName(2);
glPushMatrix();
if (theObject == 2)
highlightBegin();
glTranslatef(-0.75, -0.5, 0.0);
glRotatef(270.0, 1.0, 0.0, 0.0);
glCallList(TETRAHEDRON);
if (theObject == 2)
highlightEnd();
glPopMatrix();

glLoadName(1);
glPushMatrix();
if (theObject == 1)
highlightBegin();
glTranslatef(-0.75, 0.5, 0.0);
glRotatef(90.0, 1.0, 0.0, 0.0);
glCallList(TORUS);
if (theObject == 1)
highlightEnd();
glPopMatrix();

glLoadName(3);
glPushMatrix();
if (theObject == 3)
highlightBegin();
glTranslatef(0.75, 0.0, -1.0);
glCallList(ICOSAHEDRON);
if (theObject == 3)
highlightEnd();
glPopMatrix();

glPopMatrix();
}

void
myortho(void)
{
if (W <= H)
glOrtho(-2.5, 2.5, -2.5 * (GLfloat) H / (GLfloat) W,
2.5 * (GLfloat) H / (GLfloat) W, -10.0, 10.0);
else
glOrtho(-2.5 * (GLfloat) W / (GLfloat) H,
2.5 * (GLfloat) W / (GLfloat) H, -2.5, 2.5, -10.0, 10.0);
}

/* processHits() prints out the contents of the
* selection array.
*/
void
processHits(GLint hits, GLuint buffer[])
{
GLuint depth = ~0;
unsigned int i, getThisName;
GLuint names, *ptr;
GLuint newObject;

ptr = (GLuint *) buffer;
newObject = 0;
for (i = 0; i < hits; i++) { /* for each hit */
getThisName = 0;
names = *ptr;
ptr++; /* skip # name */
if (*ptr <= depth) {
depth = *ptr;
getThisName = 1;
}
ptr++; /* skip z1 */
if (*ptr <= depth) {
depth = *ptr;
getThisName = 1;
}
ptr++; /* skip z2 */

if (getThisName)
newObject = *ptr;
ptr += names; /* skip the names list */
}
if (theObject != newObject) {
theObject = newObject;
glutPostRedisplay();
}
}

/* ARGSUSED */
void
locate(int value)
{
GLint viewport[4];
GLint hits;

if (locating) {
if (mouse_state == GLUT_ENTERED) {
(void) glRenderMode(GL_SELECT);
glInitNames();
glPushName(-1);

glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
viewport[0] = 0;
viewport[1] = 0;
viewport[2] = W;
viewport[3] = H;
gluPickMatrix(x, H - y, 5.0, 5.0, viewport);
myortho();
glMatrixMode(GL_MODELVIEW);
draw();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
hits = glRenderMode(GL_RENDER);
} else {
hits = 0;
}
processHits(hits, selectBuf);
}
locating = 0;
}

void
passive(int newx, int newy)
{
x = newx;
y = newy;
if (!locating) {
locating = 1;
glutTimerFunc(1, locate, 0);
}
}

void
entry(int state)
{
mouse_state = state;
if (!menu_inuse) {
if (state == GLUT_LEFT) {
if (theObject != 0) {
theObject = 0;
glutPostRedisplay();
}
}
}
}

void
display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
draw();

glPushAttrib(GL_ENABLE_BIT);
glDisable(GL_DEPTH_TEST);
glDisable(GL_LIGHTING);
glDisable(GL_LINE_SMOOTH);

glMatrixMode(GL_PROJECTION);
glPushMatrix();
glLoadIdentity();
gluOrtho2D(0, 3000, 0, 3000);
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glLoadIdentity();
output(80, 2800, "Automatically names object under mouse.");
output(80, 100, "Located: %s.", objectNames[theObject]);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glMatrixMode(GL_MODELVIEW);
glPopAttrib();

glutSwapBuffers();
}

void
myReshape(int w, int h)
{
W = w;
H = h;
glViewport(0, 0, W, H);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
myortho();
glMatrixMode(GL_MODELVIEW);
}

void
polygon_mode(int value)
{
switch (value) {
case 1:
glEnable(GL_LIGHTING);
glDisable(GL_BLEND);
glEnable(GL_DEPTH_TEST);
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
break;
case 2:
glDisable(GL_LIGHTING);
glColor3f(1.0, 1.0, 1.0);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glEnable(GL_LINE_SMOOTH);
glEnable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
break;
}
glutPostRedisplay();
}

void
mstatus(int status, int newx, int newy)
{
if (status == GLUT_MENU_NOT_IN_USE) {
menu_inuse = 0;
passive(newx, newy);
} else {
menu_inuse = 1;
}
}

void
main_menu(int value)
{
if (value == 666)
exit(0);
}

/* Main Loop
* Open window with initial window size, title bar,
* RGBA display mode, and handle input events.
*/
int
main(int argc, char **argv)
{
int submenu;

glutInit(&argc, argv);
glutInitWindowSize(W, H);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutCreateWindow(argv[0]);
myinit();
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
submenu = glutCreateMenu(polygon_mode);
glutAddMenuEntry("Filled", 1);
glutAddMenuEntry("Outline", 2);
glutCreateMenu(main_menu);
glutAddMenuEntry("Quit", 666);
glutAddSubMenu("Polygon mode", submenu);
glutAttachMenu(GLUT_RIGHT_BUTTON);
glutPassiveMotionFunc(passive);
glutEntryFunc(entry);
glutMenuStatusFunc(mstatus);
glutMainLoop();
return 0; /* ANSI C requires main to return int. */
}