Question about Advanced Graphics Programming Using OpenGL

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Project on OpenGL

I m a student of BE 6th sem.i have to build a project on OpenGL consisting of SCALING, TRANSLATION,CAMERA VIEWING AND ROTATION. is there any site from where i can find the project ?

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Http://nehe.gamedev.net/lesson.asp?index=01
There are the best set of lessons for OpenGL beginners.

Posted on May 21, 2009

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my code in opengl does not work can any one help me #include <string.h> #include <GL/glut.h> #include "math.h" float rotate =0.0; float start = 0.0; float z_dep = 0.0; int poi_size = 0; int poi_arr[100][2]; float rad_arr[50]; int m_x = 0; int m_y = 0; int rubber_band_on = 0; int down_flag = 0; #define MENU1 10 #define MENU2 11 #define MENU3 12 #define MENU4 13 #define MENU5 14 GLfloat r,g,b; GLint t=0 ; void sel(int item) { switch(item) { case MENU1: {r=1 , g=0 , b=0;} break; case MENU2: {r=0 , g=0 , b=1;} break; case MENU3: {r=0 , g=1 , b=0;} break; case MENU4: {t=1;} break; case MENU5: {t=2;} break; } glutPostRedisplay(); } void menu(void) { int MainMenu, SubMenu1,SubMenu2; SubMenu1=glutCreateMenu(sel); glutAddMenuEntry("red", MENU1); glutAddMenuEntry("bule", MENU2); glutAddMenuEntry("green", MENU3); SubMenu2=glutCreateMenu(sel); glutAddMenuEntry("line", MENU4); glutAddMenuEntry("circle", MENU5); MainMenu=glutCreateMenu(sel); glutAddSubMenu("Color", SubMenu1); glutAddSubMenu("Shap", SubMenu2); glutAttachMenu(GLUT_RIGHT_BUTTON); }void drawCircle(float radius, float x1, float y1) { float angle = 0; float x2,y2,cx,cy,fx,fy; int cache = 0; glBegin(GL_LINES); for (angle = 0; angle < 360; angle+=1.0) { float rad_angle = angle * 3.14 / 180; x2 = x1+radius * sin((double)rad_angle); y2 = y1+radius * cos((double)rad_angle); if (cache) { glVertex2f(cx,cy); glVertex2f(x2,y2); } else { fx = x2; fy = y2; } cache = 1; cx = x2; cy = y2; } glVertex2f(x2,y2); glVertex2f(fx,fy); glEnd(); } void tick(void) { glutPostRedisplay(); } void display1(void) { glClear(GL_COLOR_BUFFER_BIT); // Draw the lines created by user glBegin(GL_LINES); for(int i=0; i<poi_size; i++) { glVertex2f(poi_arr[i][0],poi_arr[i][1]); } if (rubber_band_on && (poi_size%2==1)) { glVertex2f(m_x,m_y); } glEnd(); glutSwapBuffers(); } void handleKeypress(unsigned char key, int x, int y) { switch (key) { case 27: //Escape key exit(0); } } void reshape(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluOrtho2D(0, w, h, 0); glMatrixMode(GL_MODELVIEW); } void mouse_move1(int x, int y) { m_x = x; m_y = y; display1(); } void mouse1(int button, int state, int x, int y) { m_x = x; m_y = y; switch (button) { case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) { // glutIdleFunc(spinDisplay); } if (state == GLUT_UP) { if (poi_size>0) { poi_size-=2; } rubber_band_on = 0; glutIdleFunc(NULL); } break; case GLUT_LEFT_BUTTON: rubber_band_on = 1; if (state == GLUT_DOWN) { down_flag = 1; } if (state == GLUT_UP) { if(down_flag) { poi_arr[poi_size][0]=x; poi_arr[poi_size][1]=y; poi_size++; down_flag = 0; } glutIdleFunc(NULL); } break; default: break; } display1(); } float calculate_radius(int x1,int y1) { int x_diff = m_x - x1; int y_diff = m_y - y1; if(x_diff<0) { x_diff *= -1; } if(y_diff<0) { y_diff *= -1; } float mag = x_diff*x_diff + y_diff*y_diff; float rad = sqrt(mag); return rad; } void display2(void) { glClear(GL_COLOR_BUFFER_BIT); for(int i=0; i<poi_size; i+=2) { int rad_index = (int)(i/2); float rad = rad_arr[rad_index]; if (rad>1) { drawCircle(rad,poi_arr[i][0],poi_arr[i][1]); } } glutSwapBuffers(); } void mouse_move2(int x, int y) { m_x = x; m_y = y; if (rubber_band_on) { float rd = calculate_radius(poi_arr[poi_size-1][0],poi_arr[poi_size-1][1]); rad_arr[poi_size/2] = rd; } display2(); } void mouse2(int button, int state, int x, int y) { m_x = x; m_y = y; switch (button) { case GLUT_RIGHT_BUTTON: if (state == GLUT_DOWN) { // glutIdleFunc(spinDisplay); } if (state == GLUT_UP) { glutIdleFunc(NULL); } break; case GLUT_LEFT_BUTTON: if (state == GLUT_DOWN) { down_flag = 1; } if (state == GLUT_UP) { if(down_flag) { poi_arr[poi_size][0]=x; poi_arr[poi_size][1]=y; poi_size++; down_flag = 0; rubber_band_on = !rubber_band_on; } glutIdleFunc(NULL); } break; default: break; } if (rubber_band_on && poi_size>0) { float rd = calculate_radius(poi_arr[poi_size-1][0],poi_arr[poi_size-1][1]); rad_arr[poi_size/2] = rd; } display2(); } int main(int argc, char **argv) { glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB); glutInitWindowSize(1000, 800); glutCreateWindow("OPENGL LINE DRAWING"); glClearColor(0.0, 0.0, 0.0, 1.0); menu(); if (t=1) { glutDisplayFunc(display1); glutReshapeFunc(reshape); glutIdleFunc(tick); glutKeyboardFunc(handleKeypress); glutMouseFunc(mouse1); glutMotionFunc(mouse_move1); glutPassiveMotionFunc(mouse_move1); glutMainLoop(); } if (t=2) { glutDisplayFunc(display2); glutReshapeFunc(reshape); glutIdleFunc(tick); glutKeyboardFunc(handleKeypress); glutMouseFunc(mouse2); glutMotionFunc(mouse_move2); glutPassiveMotionFunc(mouse_move2); glutMainLoop(); } return 0; /* ANSI C requires main to return int. */ }

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