w3 阿土用滑鼠移動茶壺還有畫圖

1. 從上禮拜的茶壺開始，我們這次試著加入一些滑鼠左中右鍵的操作。

(第2行 ) include <stdio.h>為了執行print。

(第8行):Button代表按著的滑鼠鍵，state代表上下。

(第19行):執行void(mouse)。

2.接下來讓他點哪裡就去哪裡

(第3行):呼叫 (-1.0) ~ (+1.0) 座標。

(第6行):清空背景。

(第8行):移動茶壺座標。

(第16.17行):讓x的0....300變成-1.....+1

                    :讓y的300....0變成-1.....+1

#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
float teapotX=0,teapotY=0;
void display()
{
    glClearColor(255/255.0,255/255.5,255/255.0,1);//背景
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glColor3f((144/255.0),(86/255.0),(63/255.0));//咖啡
    glBegin(GL_POLYGON);
        glVertex2f( (80-150)/150.0, -(116-150)/150.0);
        glVertex2f( (98-150)/150.0, -(187-150)/150.0);
        glVertex2f( (207-150)/150.0, -(187-150)/150.0);
    glEnd();

    glColor3f((144/255.0),(86/255.0),(63/255.0));
    glBegin(GL_POLYGON);
        glVertex2f( (120-150)/150.0, -(146-150)/150.0);
        glVertex2f( (148-150)/150.0, -(77-150)/150.0);
        glVertex2f( (207-150)/150.0, -(187-150)/150.0);
    glEnd();

    glColor3f((144/255.0),(86/255.0),(63/255.0));
    glBegin(GL_POLYGON);
        glVertex2f( (207-150)/150.0, -(187-150)/150.0);
        glVertex2f( (215-150)/150.0, -(109-150)/150.0);
        glVertex2f( (179-150)/150.0, -(143-150)/150.0);
    glEnd();

    glColor3f((255/255.0),(238/255.0),(120/255.0));//黃色
    glBegin(GL_POLYGON);
         glVertex2f( (94-150)/150.0, -(136-150)/150.0);
         glVertex2f( (105-150)/150.0, -(177-150)/150.0);
         glVertex2f( (200-150)/150.0, -(177-150)/150.0);
    glEnd();

    glColor3f((255/255.0),(238/255.0),(120/255.0));
    glBegin(GL_POLYGON);
          glVertex2f( (125-150)/150.0, -(171-150)/150.0);
          glVertex2f( (148-150)/150.0, -(104-150)/150.0);
          glVertex2f( (196-150)/150.0, -(176-150)/150.0);
    glEnd();

    glColor3f((255/255.0),(238/255.0),(120/255.0));
    glBegin(GL_POLYGON);
        glVertex2f( (204-150)/150.0, -(133-150)/150.0);
        glVertex2f( (175-150)/150.0, -(157-150)/150.0);
        glVertex2f( (198-150)/150.0, -(177-150)/150.0);
    glEnd();

    glColor3f((144/255.0),(86/255.0),(63/255.0));
    glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.05*cos(angle)-0.5,0.05*sin(angle)+0.3);
            }
     glEnd();

     glColor3f((144/255.0),(86/255.0),(63/255.0));
     glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.05*cos(angle),0.05*sin(angle)+0.6);
            }
     glEnd();

     glColor3f((144/255.0),(86/255.0),(63/255.0));
     glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.05*cos(angle)+0.5,0.05*sin(angle)+0.4);
            }
     glEnd();

     glColor3f((255/255.0),(238/255.0),(120/255.0));
    glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.03*cos(angle)-0.5,0.03*sin(angle)+0.3);
            }
     glEnd();

     glColor3f((255/255.0),(238/255.0),(120/255.0));
     glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.03*cos(angle),0.03*sin(angle)+0.6);
            }
     glEnd();

     glColor3f((255/255.0),(238/255.0),(120/255.0));
     glBegin(GL_POLYGON);
        for(float angle=0 ; angle<=3.1415926 * 2 ;angle+=0.01)
            {
                glVertex2f(0.03*cos(angle)+0.5,0.03*sin(angle)+0.4);
            }
     glEnd();
    glutSwapBuffers();
}
void mouse(int button,int state, int x,int y){
    if(state==GLUT_DOWN){
        printf(" glVertex2f( (%d-150)/150.0, -(%d-150)/150.0);\n",x,y);
    }
}
int main(int argc,char ** argv)
{
    glutInit( &argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week03");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);
    glutMainLoop();
}