Week03 - 07161045

複習上週

• 先用Zuvio複習上周課程(點、線、面、色彩)

Mouse函式

• 先下載freeglut，並完成前兩週的步驟
• 打開程式碼後，將程式碼全部刪除，打上茶壺的程式碼

• 多打一個顯示座標的程式碼

#include <GL/glut.h>
#include <stdio.h>
void display()
{    
   glutSolidTeapot( 0.3 );  
   glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
   printf("%d %d %d %d\n", button, state, x, y);
}
int main(int argc, char**argv)
{    
   glutInit(&argc, argv);  
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);                   
   glutCreateWindow("Week03");   
   glutDisplayFunc(display);    
   glutMouseFunc(mouse);    
   glutMainLoop();
}

• 寫一個利用滑鼠移動茶壺的程式碼

#include <GL/glut.h>#include <stdio.h>
float teapotX=0, teapotY=0;void display()
{    
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);   
   glPushMatrix();   
   glTranslatef(teapotX, teapotY, 0); 
   glutSolidTeapot( 0.3 ); 
   glPopMatrix();   
   glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{   
   teapotX = (x-150)/150.0;  
   teapotY=-(y-150)/150.0;
}
int main(int argc, char**argv)
{    
   glutInit(&argc, argv);   
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);  
   glutCreateWindow("Week03");  
   glutDisplayFunc(display);  
   glutMouseFunc(mouse); 
   glutMainLoop();
}

• 利用小畫家查看座標，將座標輸入程式碼裡(自己亂做了一個很醜的愛心)

#include <GL/glut.h>
#include <stdio.h>
void display()
{    
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);       
   glBegin(GL_POLYGON);   
   glVertex2f( (168-150)/150.0, -(91-150)/150.0 );    
   glVertex2f( (77-150)/150.0, -(154-150)/150.0 );   
   glVertex2f( (68-150)/150.0, -(71-150)/150.0 );  
   glVertex2f( (95-150)/150.0, -(175-150)/150.0 );   
   glVertex2f( (71-150)/150.0, -(144-150)/150.0 );       
   glVertex2f( (82-150)/150.0, -(160-150)/150.0 );  
   glVertex2f( (116-150)/150.0, -(199-150)/150.0 );   
   glVertex2f( (165-150)/150.0, -(231-150)/150.0 );   
   glVertex2f( (237-150)/150.0, -(180-150)/150.0 );    
   glVertex2f( (270-150)/150.0, -(92-150)/150.0 );  
   glVertex2f( (235-150)/150.0, -(46-150)/150.0 ); 
   glEnd();    
   glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
}
int main(int argc, char**argv)
{    
   glutInit(&argc, argv);   
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);   
   glutCreateWindow("Week03");  
   glutDisplayFunc(display); 
   glutMouseFunc(mouse);   
   glutMainLoop();
}

• 做出圓形，並加上顏色

#include <GL/glut.h>
#include <stdio.h>
#include <math.h>
void display()
{    
   glClearColor(152/255.0, 256/255.0, 84/255.0, 1); 
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);       
   glColor3f(244/255.0,152/255.0,94/255.0); 
   glBegin(GL_POLYGON);  
   for(float angle=0; angle<=3.1415926 * 2 ; angle +=0.01)     
  {        
      glVertex2f(0.3*cos(angle), 0.8*sin(angle));     
  }    
   glEnd(); 
   glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
}
int main(int argc, char**argv)
{    
   glutInit(&argc, argv); 
   glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);    
   glutCreateWindow("Week03"); 
   glutDisplayFunc(display);  
   glutMouseFunc(mouse);   
   glutMainLoop();
}