week_04 孫紹軒

1.到http://jsyeh.org/3dcg10
   下載[data]、[windows]、[glut32.dll]檔案
    解壓縮後將glut32.dll及data拉到windows裡面，再開啟Transformation

2.

(1) glTranslatef(x,y,z)   移動位置

(2) glRotate(旋轉角度,x,y,z)   旋轉
(3) glScale(x,y,z)     大小縮放

3.使用上次茶壺檔案來做增加程式碼

#include <stdio.h>

#include <GL/glut.h>

float teapotX=0,teapotY=0,angle=0;

int oldX=0,oldY=0,nowRotate=0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glPushMatrix();

        glTranslatef(teapotX,teapotY,0);

        glRotatef(angle,0,0,1);

        glutSolidTeapot(0.3);

    glPopMatrix();

    glutSwapBuffers();

}

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

{

    if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN) nowRotate=1;

    if(button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN) nowRotate=0;

    oldX=x; oldY=y;

}

void motion(int x,int y)

{

    if(nowRotate==1) angle += (x-oldX);

    else

    {

        teapotX += (x-oldX)/150.0;

        teapotY += (oldY-y)/150.0;

    }

    oldX=x; oldY=y; 

    glutPostRedisplay();

}

int main (int argc,char ** argv)

{

    glutInit(&argc, argv);

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

    glutCreateWindow("Week05 Mouse_Rotate");

    glutDisplayFunc(display);

    glutMouseFunc(mouse);

    glutMotionFunc(motion);

    glutMainLoop();

}