電腦圖學Week03

 Week03

1. 桌面安裝freeglut把lib的libfreeglut.a複製改名成libglut32.a
2. File-NewProject,GLUT專案week03_mouse
3. 貼上10行程式碼
4. 在加3行
   #include <stdio.h>
   void mouse(int button, int state,int x,int y)
   {
       printf("Hello Mouse!\n");
   }
   
   變成#include <GL/glut.h>
   #include <stdio.h>
   void mouse(int button, int state,int x,int y)
   {
       printf("Hello Mouse!\n");
   }
   void display()
   {
       glutSolidTeapot(0.3);
       glutSwapBuffers();
   }
   int main(int argc,char*argv[])
   {
       glutInit(&argc,argv);
       glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
       glutCreateWindow("week03 mouse");
       glutDisplayFunc(display);
       glutMouseFunc(mouse);
   
       glutMainLoop();
   }

1. week03_mouse 印參數把第5行printf("Hello Mouse!\n");
   更改成printf("%d %d %d %d\n",button,state,x,y); 
2. 會變成點茶壺圖繪跳出座標點
   
   
   
3. week03_mouse 滑鼠寫程式#include <GL/glut.h>
   
   #include <stdio.h>
   
   void mouse(int button, int state,int x,int y)
   
   {
   
       ///printf("Hello Mouse!\n");
   
       ///printf("%d %d %d %d\n",button,state,x,y);
   
       if(state==GLUT_DOWN) printf("glVertex2f((%d-150)/150.0,-(%d-150)/150.0);\n",x,y);
   
   }
   
   void display()
   
   {
   
       glutSolidTeapot(0.3);
   
       glutSwapBuffers();
   
   }
   
   int main(int argc,char*argv[])
   
   {
   
       glutInit(&argc,argv);
   
       glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
   
       glutCreateWindow("week03 mouse");
   
       glutDisplayFunc(display);
   
       glutMouseFunc(mouse);
   
   
   
       glutMainLoop();
   
   }
   
   
   

1. 下載windows.zip和data.zip解壓縮後把data檔案放進windows
   
   
   
2. 移動茶壺 在打開一個檔案

#include <GL/glut.h>
#include <stdio.h>
float teapotX=0,teapotY=0;
void mouse(int button, int state,int x,int y)
{
    teapotX = (x-150)/150.0;
    teapotY = -(y-150)/150.0;
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
    glPushMatrix();
        glTranslatef(teapotX,teapotY,0);
        glutSolidTeapot(0.3);
    glPopMatrix();
    glutSwapBuffers();
}
int main(int argc,char*argv[])
{
    glutInit(&argc,argv);
    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
    glutCreateWindow("week03 mouse");
    glutDisplayFunc(display);
    glutMouseFunc(mouse);

    glutMainLoop();
}

1. 試著了解glRotatef(角度,x,y,z)的參數
2. 可以利用右手比讚來理解。
3. 轉動軸,就是讚的拇指,轉動方向,就是其他手指的轉動方向
4. 對y軸轉,簡單比個讚
5. 對x軸轉,要把拇指向右,也可以轉
6. 對-y軸轉,就是比個倒讚,也可以理解
7. 最難的是z軸,向著哪裏呢?那個拇指向著你的鼻子

1. 1#include <GL/glut.h>
   
   #include <stdio.h>
   
   float teapotX=0,teapotY=0;
   
   float angle = 0;
   
   void mouse(int button, int state,int x,int y)
   
   {
   
       teapotX = (x-150)/150.0;
   
       teapotY = -(y-150)/150.0;
   
   }
   
   void display()
   
   {
   
       glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
   
       glPushMatrix();
   
           glRotatef(angle,0,0,1);
   
           glutSolidTeapot(0.3);
   
       glPopMatrix();
   
       glutSwapBuffers();
   
   }
   
   void motion(int x,int y)
   
   {
   
       angle = x;
   
       display();
   
   }
   
   int main(int argc,char*argv[])
   
   {
   
       glutInit(&argc,argv);
   
       glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
   
       glutCreateWindow("week03 mouse");
   
       glutDisplayFunc(display);
   
       glutMouseFunc(mouse);
   
       glutMotionFunc(motion);
   
   
   
       glutMainLoop();
   
   }
2.  
   

1. week03_mouse_translate_rotate
2.