賴胖筆記 week6

茶壺的移動與旋轉

#include <GL/glut.h>

const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };

const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };

const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };

const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };

const GLfloat high_shininess[] = { 100.0f };

int type=1;

float teapotX=0, teapotY=0;

float teapotRotY=0;

int oldX=0, oldY=0;

void mouse(int buttom, int state, int x, int y)

{

    oldX=x;

    oldY=y;

}

void motion(int x,int y)

{

    if(type==2){

    teapotX += x-oldX;

    teapotY -= y-oldY;

    }

    else if(type==1)

    {

        teapotRotY += x-oldX;

    }

    oldX=x;

    oldY=y;

    glutPostRedisplay();

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef( teapotX/250.0,teapotY/250.0,0);

        glRotatef(teapotRotY, 0,-1,0);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

void keyboard(unsigned char key, int x, int y)

{

    if(key=='e'||key=='E')type=1;

    if(key=='w'||key=='W')type=2;

}

int main(int argc, char *argv[])

{

    glutInit(&argc, argv);

    glutInitWindowSize(500,500);

    glutInitWindowPosition(10,10);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMotionFunc(motion);

    glutMouseFunc(mouse);

    glutKeyboardFunc(keyboard);

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    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);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);

    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);

    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);

    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();

    return EXIT_SUCCESS;

}

按下w鍵來控制移動，e鍵來控制轉向

茶壺自動旋轉

在上面程式碼中的display中加入teapotRotY++;

並在main函式中加入glutIdleFunc(display);

旋轉的差異

原地旋轉與旋轉整個世界的差異