差點感不上進度

今天一樣先弄上周的光源茶壺，
#include <GLUT/glut.h>
#include <GL/glut.h>
#include <stdlib.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 };

float teapotX=0;float teapotY=0;
int oldX=0,oldY=0;
void mouse(int button,int state,int x,int y)
{
    oldX=x;
    oldY=y;
}

void motion(int x,int y)
{
    teapotX +=x-oldX;
    teapotY +=y-oldY;
    oldX=x;
    oldY=y;
    glutPostRedisplay();
}

void display()
{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);///清畫面

    glPushMatrix();///備份數值
    glTranslatef(teapotX/250.0,teapotY/250.0,0);
    glutSolidTeapot(0.3);

    glPopMatrix();///還原,防止數值疊加

    glutSwapBuffers();

}
int main(int argc, char *argv[])
{
    glutInit(&argc, argv);
    glutInitWindowSize(640,480);
    glutInitWindowPosition(10,10);
    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMotionFunc(motion);
    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();
}

再來是加上用鍵盤來控制

#include <GLUT/glut.h>

#include <GL/glut.h>

#include <stdlib.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)

{

    oldX=x;

    oldY=y;

}

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();///更新畫面

}

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);///清畫面

    glPushMatrix();///備份數值

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

    glRotatef(teapotRotY,0,-1,0);///x方向的動 vs. Y軸

    glutSolidTeapot(0.3);

    glPopMatrix();///還原,防止數值疊加

    glutSwapBuffers();

}

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

{///沒有正負號,所以全部當正數0~255

    if(key=='e'||key=='E') type=1;///MAYA:轉動 1

    if(key=='w'||key=='W') type=2;///MAYA:轉動 2

    printf("now: %c\n",key);

}

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

{

    glutInit(&argc, argv);

    glutInitWindowSize(640,480);

    glutInitWindowPosition(10,10);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    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();

}

甚至可以讓茶壺自主旋轉,只要再main函式裡加上glutIdleFunc(display);並且在display函式裡加上teapotRotY+=3就可以了。