Forum » Programiranje » Risanje v OpenGL
Risanje v OpenGL
dizel ::
Jou!
Mene zanima, če se tle kdo ukvarja kej z OpenGL. Fora je v tem, da smo na faksu dobil nalogo napisat en majhen programv v OpenGl (GLUT) sprogramiran v C-ju al Fortranu, ki bo meni narisal skodelico za belo kavo z ročajem, sej vem, da se trapast šliš, ampak to je naloga. Jst mal teorije vem, sam ne rasturam pa tolk, da bi to z lahkoto narisal. Potem so pa še podani parametri, ki jih lahko spreminjaš, debelina, višina in premer. A ma slučajno kdo kak podoben primer al pa kak link, kjer bi ble izrisane kake podobne komplicirane zadeve. Sem že iskal, pa so povsod sam primeri z že predefiniranimi oblikami (ala teapot, cube, torus...). Pomoč publike prosim. Hvala.
Mene zanima, če se tle kdo ukvarja kej z OpenGL. Fora je v tem, da smo na faksu dobil nalogo napisat en majhen programv v OpenGl (GLUT) sprogramiran v C-ju al Fortranu, ki bo meni narisal skodelico za belo kavo z ročajem, sej vem, da se trapast šliš, ampak to je naloga. Jst mal teorije vem, sam ne rasturam pa tolk, da bi to z lahkoto narisal. Potem so pa še podani parametri, ki jih lahko spreminjaš, debelina, višina in premer. A ma slučajno kdo kak podoben primer al pa kak link, kjer bi ble izrisane kake podobne komplicirane zadeve. Sem že iskal, pa so povsod sam primeri z že predefiniranimi oblikami (ala teapot, cube, torus...). Pomoč publike prosim. Hvala.
Najboljši so že padli mi pa se pogumno spotikamo naprej!
willson ::
lp!
#include
#include
#include
#ifdef _WIN32
# include
#else
# include
#endif
#include "texture.h"
#define VIEWING_DISTANCE_MIN 3.0
#define TEXTURE_ID_CUBE 1
enum {
MENU_LIGHTING = 1,
MENU_POLYMODE,
MENU_TEXTURING,
MENU_EXIT
};
typedef int BOOL;
#define TRUE 1
#define FALSE 0
static BOOL g_bLightingEnabled = TRUE;
static BOOL g_bFillPolygons = TRUE;
static BOOL g_bTexture = FALSE;
static BOOL g_bButton1Down = FALSE;
static GLfloat g_fTeapotAngle = 0.0;
static GLfloat g_fTeapotAngle2 = 0.0;
static GLfloat g_fViewDistance = 3 * VIEWING_DISTANCE_MIN;
static GLfloat g_nearPlane = 1;
static GLfloat g_farPlane = 1000;
static int g_Width = 600; // Initial window width
static int g_Height = 600; // Initial window height
static int g_yClick = 0;
static float g_lightPos[4] = { 10, 10, -100, 1 }; // Position of light
#ifdef _WIN32
static DWORD last_idle_time;
#else
static struct timeval last_idle_time;
#endif
void DrawCubeFace(float fSize)
{
fSize /= 2.0;
glBegin(GL_QUADS);
glVertex3f(-fSize, -fSize, fSize); glTexCoord2f (0, 0);
glVertex3f(fSize, -fSize, fSize); glTexCoord2f (1, 0);
glVertex3f(fSize, fSize, fSize); glTexCoord2f (1, 1);
glVertex3f(-fSize, fSize, fSize); glTexCoord2f (0, 1);
glEnd();
}
void DrawCubeWithTextureCoords (float fSize)
{
glPushMatrix();
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 0, 1, 0);
DrawCubeFace (fSize);
glRotatef (180, 0, 1, 0);
DrawCubeFace (fSize);
glPopMatrix();
}
void RenderObjects(void)
{
float colorBronzeDiff[4] = { 0.8, 0.6, 0.0, 1.0 };
float colorBronzeSpec[4] = { 1.0, 1.0, 0.4, 1.0 };
float colorBlue[4] = { 0.0, 0.2, 1.0, 1.0 };
float colorNone[4] = { 0.0, 0.0, 0.0, 0.0 };
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Main object (cube) ... transform to its coordinates, and render
glRotatef(15, 1, 0, 0);
glRotatef(45, 0, 1, 0);
glRotatef(g_fTeapotAngle, 0, 0, 1);
glMaterialfv(GL_FRONT, GL_DIFFUSE, colorBlue);
glMaterialfv(GL_FRONT, GL_SPECULAR, colorNone);
glColor4fv(colorBlue);
glBindTexture(GL_TEXTURE_2D, TEXTURE_ID_CUBE);
DrawCubeWithTextureCoords(1.0);
// Child object (teapot) ... relative transform, and render
glPushMatrix();
glTranslatef(2, 0, 0);
glRotatef(g_fTeapotAngle2, 1, 1, 0);
glMaterialfv(GL_FRONT, GL_DIFFUSE, colorBronzeDiff);
glMaterialfv(GL_FRONT, GL_SPECULAR, colorBronzeSpec);
glMaterialf(GL_FRONT, GL_SHININESS, 50.0);
glColor4fv(colorBronzeDiff);
glBindTexture(GL_TEXTURE_2D, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glPopMatrix();
}
void display(void)
{
// Clear frame buffer and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set up viewing transformation, looking down -Z axis
glLoadIdentity();
gluLookAt(0, 0, -g_fViewDistance, 0, 0, -1, 0, 1, 0);
// Set up the stationary light
glLightfv(GL_LIGHT0, GL_POSITION, g_lightPos);
// Render the scene
RenderObjects();
// Make sure changes appear onscreen
glutSwapBuffers();
}
void reshape(GLint width, GLint height)
{
g_Width = width;
g_Height = height;
glViewport(0, 0, g_Width, g_Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(65.0, (float)g_Width / g_Height, g_nearPlane, g_farPlane);
glMatrixMode(GL_MODELVIEW);
}
void InitGraphics(void)
{
int width, height;
int nComponents;
void* pTextureImage;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
// Create texture for cube; load marble texture from file and bind it
pTextureImage = read_texture("marble.rgb", &width, &height, &nComponents);
glBindTexture(GL_TEXTURE_2D, TEXTURE_ID_CUBE);
gluBuild2DMipmaps(GL_TEXTURE_2D, // texture to specify
GL_RGBA, // internal texture storage format
width, // texture width
height, // texture height
GL_RGBA, // pixel format
GL_UNSIGNED_BYTE, // color component format
pTextureImage); // pointer to texture image
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
void MouseButton(int button, int state, int x, int y)
{
// Respond to mouse button presses.
// If button1 pressed, mark this state so we know in motion function.
if (button == GLUT_LEFT_BUTTON)
{
g_bButton1Down = (state == GLUT_DOWN) ? TRUE : FALSE;
g_yClick = y - 3 * g_fViewDistance;
}
}
void MouseMotion(int x, int y)
{
// If button1 pressed, zoom in/out if mouse is moved up/down.
if (g_bButton1Down)
{
g_fViewDistance = (y - g_yClick) / 3.0;
if (g_fViewDistance < VIEWING_DISTANCE_MIN)
g_fViewDistance = VIEWING_DISTANCE_MIN;
glutPostRedisplay();
}
}
void AnimateScene(void)
{
float dt;
#ifdef _WIN32
DWORD time_now;
time_now = GetTickCount();
dt = (float) (time_now - last_idle_time) / 1000.0;
#else
// Figure out time elapsed since last call to idle function
struct timeval time_now;
gettimeofday(&time_now, NULL);
dt = (float)(time_now.tv_sec - last_idle_time.tv_sec) +
1.0e-6*(time_now.tv_usec - last_idle_time.tv_usec);
#endif
// Animate the teapot by updating its angles
g_fTeapotAngle += dt * 30.0;
g_fTeapotAngle2 += dt * 100.0;
// Save time_now for next time
last_idle_time = time_now;
// Force redraw
glutPostRedisplay();
}
void SelectFromMenu(int idCommand)
{
switch (idCommand)
{
case MENU_LIGHTING:
g_bLightingEnabled = !g_bLightingEnabled;
if (g_bLightingEnabled)
glEnable(GL_LIGHTING);
else
glDisable(GL_LIGHTING);
break;
case MENU_POLYMODE:
g_bFillPolygons = !g_bFillPolygons;
glPolygonMode (GL_FRONT_AND_BACK, g_bFillPolygons ? GL_FILL : GL_LINE);
break;
case MENU_TEXTURING:
g_bTexture = !g_bTexture;
if (g_bTexture)
glEnable(GL_TEXTURE_2D);
else
glDisable(GL_TEXTURE_2D);
break;
case MENU_EXIT:
exit (0);
break;
}
// Almost any menu selection requires a redraw
glutPostRedisplay();
}
void Keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 27: // ESCAPE key
exit (0);
break;
case 'l':
SelectFromMenu(MENU_LIGHTING);
break;
case 'p':
SelectFromMenu(MENU_POLYMODE);
break;
case 't':
SelectFromMenu(MENU_TEXTURING);
break;
}
}
int BuildPopupMenu (void)
{
int menu;
menu = glutCreateMenu (SelectFromMenu);
glutAddMenuEntry ("Toggle lighting\tl", MENU_LIGHTING);
glutAddMenuEntry ("Toggle polygon fill\tp", MENU_POLYMODE);
glutAddMenuEntry ("Toggle texturing\tt", MENU_TEXTURING);
glutAddMenuEntry ("Exit demo\tEsc", MENU_EXIT);
return menu;
}
int main(int argc, char** argv)
{
// GLUT Window Initialization:
glutInit (&argc, argv);
glutInitWindowSize (g_Width, g_Height);
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow ("CS248 GLUT example");
// Initialize OpenGL graphics state
InitGraphics();
// Register callbacks:
glutDisplayFunc (display);
glutReshapeFunc (reshape);
glutKeyboardFunc (Keyboard);
glutMouseFunc (MouseButton);
glutMotionFunc (MouseMotion);
glutIdleFunc (AnimateScene);
// Create our popup menu
BuildPopupMenu ();
glutAttachMenu (GLUT_RIGHT_BUTTON);
// Get the initial time, for use by animation
#ifdef _WIN32
last_idle_time = GetTickCount();
#else
gettimeofday (&last_idle_time, NULL);
#endif
// Turn the flow of control over to GLUT
glutMainLoop ();
return 0;
}
Tle mas en primer uporabe I/O funkcij in osnove transformiranja in "leplenja" textur...
drugac pa www.google.com => OpenGL GLUT example - pa bos najdu se vec podobnih primerov...
#include
#include
#include
#ifdef _WIN32
# include
#else
# include
#endif
#include "texture.h"
#define VIEWING_DISTANCE_MIN 3.0
#define TEXTURE_ID_CUBE 1
enum {
MENU_LIGHTING = 1,
MENU_POLYMODE,
MENU_TEXTURING,
MENU_EXIT
};
typedef int BOOL;
#define TRUE 1
#define FALSE 0
static BOOL g_bLightingEnabled = TRUE;
static BOOL g_bFillPolygons = TRUE;
static BOOL g_bTexture = FALSE;
static BOOL g_bButton1Down = FALSE;
static GLfloat g_fTeapotAngle = 0.0;
static GLfloat g_fTeapotAngle2 = 0.0;
static GLfloat g_fViewDistance = 3 * VIEWING_DISTANCE_MIN;
static GLfloat g_nearPlane = 1;
static GLfloat g_farPlane = 1000;
static int g_Width = 600; // Initial window width
static int g_Height = 600; // Initial window height
static int g_yClick = 0;
static float g_lightPos[4] = { 10, 10, -100, 1 }; // Position of light
#ifdef _WIN32
static DWORD last_idle_time;
#else
static struct timeval last_idle_time;
#endif
void DrawCubeFace(float fSize)
{
fSize /= 2.0;
glBegin(GL_QUADS);
glVertex3f(-fSize, -fSize, fSize); glTexCoord2f (0, 0);
glVertex3f(fSize, -fSize, fSize); glTexCoord2f (1, 0);
glVertex3f(fSize, fSize, fSize); glTexCoord2f (1, 1);
glVertex3f(-fSize, fSize, fSize); glTexCoord2f (0, 1);
glEnd();
}
void DrawCubeWithTextureCoords (float fSize)
{
glPushMatrix();
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 1, 0, 0);
DrawCubeFace (fSize);
glRotatef (90, 0, 1, 0);
DrawCubeFace (fSize);
glRotatef (180, 0, 1, 0);
DrawCubeFace (fSize);
glPopMatrix();
}
void RenderObjects(void)
{
float colorBronzeDiff[4] = { 0.8, 0.6, 0.0, 1.0 };
float colorBronzeSpec[4] = { 1.0, 1.0, 0.4, 1.0 };
float colorBlue[4] = { 0.0, 0.2, 1.0, 1.0 };
float colorNone[4] = { 0.0, 0.0, 0.0, 0.0 };
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
// Main object (cube) ... transform to its coordinates, and render
glRotatef(15, 1, 0, 0);
glRotatef(45, 0, 1, 0);
glRotatef(g_fTeapotAngle, 0, 0, 1);
glMaterialfv(GL_FRONT, GL_DIFFUSE, colorBlue);
glMaterialfv(GL_FRONT, GL_SPECULAR, colorNone);
glColor4fv(colorBlue);
glBindTexture(GL_TEXTURE_2D, TEXTURE_ID_CUBE);
DrawCubeWithTextureCoords(1.0);
// Child object (teapot) ... relative transform, and render
glPushMatrix();
glTranslatef(2, 0, 0);
glRotatef(g_fTeapotAngle2, 1, 1, 0);
glMaterialfv(GL_FRONT, GL_DIFFUSE, colorBronzeDiff);
glMaterialfv(GL_FRONT, GL_SPECULAR, colorBronzeSpec);
glMaterialf(GL_FRONT, GL_SHININESS, 50.0);
glColor4fv(colorBronzeDiff);
glBindTexture(GL_TEXTURE_2D, 0);
glutSolidTeapot(0.3);
glPopMatrix();
glPopMatrix();
}
void display(void)
{
// Clear frame buffer and depth buffer
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Set up viewing transformation, looking down -Z axis
glLoadIdentity();
gluLookAt(0, 0, -g_fViewDistance, 0, 0, -1, 0, 1, 0);
// Set up the stationary light
glLightfv(GL_LIGHT0, GL_POSITION, g_lightPos);
// Render the scene
RenderObjects();
// Make sure changes appear onscreen
glutSwapBuffers();
}
void reshape(GLint width, GLint height)
{
g_Width = width;
g_Height = height;
glViewport(0, 0, g_Width, g_Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(65.0, (float)g_Width / g_Height, g_nearPlane, g_farPlane);
glMatrixMode(GL_MODELVIEW);
}
void InitGraphics(void)
{
int width, height;
int nComponents;
void* pTextureImage;
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
// Create texture for cube; load marble texture from file and bind it
pTextureImage = read_texture("marble.rgb", &width, &height, &nComponents);
glBindTexture(GL_TEXTURE_2D, TEXTURE_ID_CUBE);
gluBuild2DMipmaps(GL_TEXTURE_2D, // texture to specify
GL_RGBA, // internal texture storage format
width, // texture width
height, // texture height
GL_RGBA, // pixel format
GL_UNSIGNED_BYTE, // color component format
pTextureImage); // pointer to texture image
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR);
glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
}
void MouseButton(int button, int state, int x, int y)
{
// Respond to mouse button presses.
// If button1 pressed, mark this state so we know in motion function.
if (button == GLUT_LEFT_BUTTON)
{
g_bButton1Down = (state == GLUT_DOWN) ? TRUE : FALSE;
g_yClick = y - 3 * g_fViewDistance;
}
}
void MouseMotion(int x, int y)
{
// If button1 pressed, zoom in/out if mouse is moved up/down.
if (g_bButton1Down)
{
g_fViewDistance = (y - g_yClick) / 3.0;
if (g_fViewDistance < VIEWING_DISTANCE_MIN)
g_fViewDistance = VIEWING_DISTANCE_MIN;
glutPostRedisplay();
}
}
void AnimateScene(void)
{
float dt;
#ifdef _WIN32
DWORD time_now;
time_now = GetTickCount();
dt = (float) (time_now - last_idle_time) / 1000.0;
#else
// Figure out time elapsed since last call to idle function
struct timeval time_now;
gettimeofday(&time_now, NULL);
dt = (float)(time_now.tv_sec - last_idle_time.tv_sec) +
1.0e-6*(time_now.tv_usec - last_idle_time.tv_usec);
#endif
// Animate the teapot by updating its angles
g_fTeapotAngle += dt * 30.0;
g_fTeapotAngle2 += dt * 100.0;
// Save time_now for next time
last_idle_time = time_now;
// Force redraw
glutPostRedisplay();
}
void SelectFromMenu(int idCommand)
{
switch (idCommand)
{
case MENU_LIGHTING:
g_bLightingEnabled = !g_bLightingEnabled;
if (g_bLightingEnabled)
glEnable(GL_LIGHTING);
else
glDisable(GL_LIGHTING);
break;
case MENU_POLYMODE:
g_bFillPolygons = !g_bFillPolygons;
glPolygonMode (GL_FRONT_AND_BACK, g_bFillPolygons ? GL_FILL : GL_LINE);
break;
case MENU_TEXTURING:
g_bTexture = !g_bTexture;
if (g_bTexture)
glEnable(GL_TEXTURE_2D);
else
glDisable(GL_TEXTURE_2D);
break;
case MENU_EXIT:
exit (0);
break;
}
// Almost any menu selection requires a redraw
glutPostRedisplay();
}
void Keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 27: // ESCAPE key
exit (0);
break;
case 'l':
SelectFromMenu(MENU_LIGHTING);
break;
case 'p':
SelectFromMenu(MENU_POLYMODE);
break;
case 't':
SelectFromMenu(MENU_TEXTURING);
break;
}
}
int BuildPopupMenu (void)
{
int menu;
menu = glutCreateMenu (SelectFromMenu);
glutAddMenuEntry ("Toggle lighting\tl", MENU_LIGHTING);
glutAddMenuEntry ("Toggle polygon fill\tp", MENU_POLYMODE);
glutAddMenuEntry ("Toggle texturing\tt", MENU_TEXTURING);
glutAddMenuEntry ("Exit demo\tEsc", MENU_EXIT);
return menu;
}
int main(int argc, char** argv)
{
// GLUT Window Initialization:
glutInit (&argc, argv);
glutInitWindowSize (g_Width, g_Height);
glutInitDisplayMode ( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow ("CS248 GLUT example");
// Initialize OpenGL graphics state
InitGraphics();
// Register callbacks:
glutDisplayFunc (display);
glutReshapeFunc (reshape);
glutKeyboardFunc (Keyboard);
glutMouseFunc (MouseButton);
glutMotionFunc (MouseMotion);
glutIdleFunc (AnimateScene);
// Create our popup menu
BuildPopupMenu ();
glutAttachMenu (GLUT_RIGHT_BUTTON);
// Get the initial time, for use by animation
#ifdef _WIN32
last_idle_time = GetTickCount();
#else
gettimeofday (&last_idle_time, NULL);
#endif
// Turn the flow of control over to GLUT
glutMainLoop ();
return 0;
}
Tle mas en primer uporabe I/O funkcij in osnove transformiranja in "leplenja" textur...
drugac pa www.google.com => OpenGL GLUT example - pa bos najdu se vec podobnih primerov...
dizel ::
Ej, willson, hvala, sem kar nekaj uporabnega našel. Sej počas bo že šlo, če ma pa še kdo kej pametnega za dodat, pa lepo prosim.
Najboljši so že padli mi pa se pogumno spotikamo naprej!
Senitel ::
Kaj maš to za spreminjat širino, višino, premer? Samo spreminjanje dimenzij objekta po določeni osi, al kaj bol kompliciranga?
Zgodovina sprememb…
- spremenil: Senitel ()
dizel ::
Senitel: ko bi program zalaufu, bi te vprašal za željen premer skodelice, debelino stene in višino. Sej v bistvu je vse v eni osi, sam morjo bit neodvisni, tko da pomoje s kakšno scale funkcijo ne bo šlo. A bi se dal s kako matematično funkcijo popisat profil, pa ga zarotirat okrog osi, višino stene in radij zaokrožitev pa vzet kot spremenljivke? Al pa delat s translate funkcijo, da bi dobil debelino?
Najboljši so že padli mi pa se pogumno spotikamo naprej!
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