Week06

Move&Spin

#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[] = { 5.0f, 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 button, int state, int x, int y)

{

    oldX = x;

    oldY = y;

}

void motion(int x,int y)

{

    if(type==1){///轉動

        teapotRotY += x-oldX;

    }

    else if(type==2){///移動

        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

    ///我去移動它(一個在轉動中的茶壺)

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

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

        glutWireTeapot(0.5);

    glPopMatrix();///備份矩陣

    glutSwapBuffers();

    teapotRotY+=5;///每次多轉動X度

}

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

{///沒有正負號，全部都當正的來用 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);

    glutInitWindowSize(500,500);

    glutInitWindowPosition(750,250);

    glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("GLUT Shapes");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutKeyboardFunc(keyboard);

    glutIdleFunc(display);///Idle閒閒的時候，就重畫

    glEnable(GL_DEPTH_TEST);

    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;

}