91013'6 打光

轉動&移動的立體茶壺

#include <GL/glut.h>
#include <stdio.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; ///1:rotate 2:translate
float teapotX=0; float teapotY=0;///
float teapotRotY=0;///轉動的變數
int oldX=0, oldY=0;
void mouse(int button, int state, int x, int y)///mouse要可移動teapot (按下去的動作)
{
    oldX=x;
    oldY=y;
}
void motion(int x,int y)///(motion移動的動作)
{
    if(type==1){
        teapotRotY += x-oldX;
    }
    else if(type==2){
        teapotX += x-oldX;
        teapotY += y-oldY;
    }
    oldX=x;
    oldY=y;
    glutPostRedisplay();///更新畫面
}

void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();///備份矩陣
        glTranslatef(teapotX/250.0, -teapotY/250.0, 0);///y要加負號才能是正確的方向
        glRotatef( teapotRotY, 0,-1,0);///x方向的動vsY軸
        glutSolidTeapot(0.3);
    glPopMatrix();///備份矩陣
    glutSwapBuffers();
}
void keyboard(unsigned char key, int x, int y)
{///沒有正負號,全部都當正數來用 0...255
    if(key=='e'||key=='E') type=1;///Maya 轉動1
    if(key=='w'||key=='W') type=2;///Maya 移動2
    printf("now: %c\n", key);
}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    glutKeyboardFunc(keyboard);///記得增加這三行


    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;
}

最後就可以得到一個

按w可以轉動 按e可以移動

的茶壺~~~