week06 move teapot

這次我們要試著移動茶壺!

#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 };

/* Program entry point */
float teapotX=0, teapotY=0;
int oldX=0, oldY=0;
void mouse(int button, int state,int x,int y)
{
    oldX=x;
    oldY=y;
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(teapotX/280.0,-teapotY/250.0,0);
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
}
void motion(int x,int y)
{
    teapotX+= x-oldX;
    teapotY+= y-oldY;
    oldX=x;
    oldY=y;
    glutPostRedisplay();

}
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);

    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;
}












如果想轉動茶壺...
只需要將glTranslatef(teapotX/280.0,-teapotY/250.0,0);
換成glRotatef(teapotX,0,-1,0);
就可以了!



那如果想兩個功能都有呢?
這樣的話...得修改蠻多的

/* Program entry point */
int type=1;
float teapotX=0, teapotY=0;
float teapotRotY=0;
int oldX=0, oldY=0;
void mouse(int button, int state,int x,int y)
{
    oldX=x;
    oldY=y;
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(teapotX/280.0,-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;
}
void motion(int x,int y)
{
    if(type==1)
    {
        teapotRotY+=x-oldX;
    }
    else if(type==2)
    {
        teapotX+= x-oldX;
        teapotY+= y-oldY;
    }
    oldX=x;
    oldY=y;
    glutPostRedisplay();

}
請加glutKeyboardFunc(keyboard);
/*Main*/


(BONUS)茶壺自轉程式:
teapotRotY+=3; (void display最尾端)
glutIdleFunc(display); (main)