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Cylinder & Parallelopiped
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Cylinder & Parallelopiped
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#include<stdio.h>
#include<math.h>
#include<GL/glut.h>
void draw_pixel(GLint cx,GLint cy)
{
glColor3f(1.0,0.0,0.0);
glBegin(GL_POINTS);
glVertex2f(Cx,Cy);
glEnd();
}
void plot_pixel(GLint h,GLint k,GLint x,GLint 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(GLint h,GLint k,GLint r)
{
GLint d = 1-r,x=0,y=r;
while(y>x)
{
plot_pixel(h,x,k,y);
if(d<0) d+=2*x+3;
else
{
d+=2*(x-y)+5;
-y;
++x;
}
}
plot_pixel(h,x,k,y);
}
void cylinder_draw()
{
GLint xc=100, yc=100, r=50;
GLint i, n=50;
for(i=0;i<n;i+=3)
circle_draw(xc,yc+i,r);
}
void parallelopiped(int x1, int x2, int y1, int y2, int y3, int y4)
{
glColor3f(0.0,0.0,1.0);
glPointSize(2.0);
glBegin(GL_LINE_LOOP);
glVertex2f(x1,y1);
glVertex2f(x2,y3);
glVertex2f(x2,y4);
glVertex2f(x1,y2);
glEnd();
}
void parallelopiped_draw()
{
int x1=200;
int x2=300;
int y1=100;
int y2=175;
int y3=100;
int y4=175;
for(i=0;i<=n;i+=2)
parallelopiped(x1+i,x2+i,y1+i,y2+i,y3+i,y4+i);
}
void init(void)
{
glClearColor(1.0,1.0,1.0,1.0);
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0,400.0,0.0,300.0);
}
void display(void)
{
glClear(GL_CLEAR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0);
glPointSize(2.0);
cylinder_draw();
parallelopiped_draw();
glFlush();
}
void main(int argc,char** argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);
glutInitWindowSize(500,500);
glutInitWindowPosistion(0,0);
glutCreateWindow("Cylinder & Parallelopiped");
glutDisplayFunc(display);
init();
glutMainLoop();
}