cyli.txt

来自「a source code for banker s algorithm」· 文本 代码 · 共 56 行

#include<glut.h>
#include<math.h>
#include<stdio.h>
void draw_pixel(GL int cx,GL int cy)
{
 glColor3f(1.0,0.0,0.0);
 glBegin(GL_POINTS);
 glVertex2i(cx,cy);
 glEnd();
}
void plotpixel(GL int h,GL int k,GL int x,GL int y)
{
  draw_pixel(x+h,y+k);
  draw_pixel(-x+h,y+k);
  draw_pixel(x+h,-y+k);
  draw_pixel(-x+h,-y+k);
  draw_pixel(y+h,x+k);
  draw_pixel(-y+h,x+k);
  draw_pixel(y+h,-x+k);
  draw_pixel(-y+h,-x+k);
}
void circle_draw(GL int h,GL int k,GL int r)
{
  GL int d=1-r,x=0,y=r;
  while(y>x)
  {
     plotpixel(h,k,x,y);
	 if(d<0)
	 {
	 d+=2*x+3;
	 }
	 else
	 {
      d+=2*(x-y)+5;
	  --y;
	  }
	  ++x;
  }
  plotpixel(h,k,x,y);
}
void displaycircle(void )
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0);
circle_draw();
glFlush();
}
void main()
{
glutInitWindowPosition(350,350);
glutInitWindowSize(400,300);
glutCreateWindow("cylinder");
init();
glutDisplayFunc(displaycircle);
glutMainLoop();
}