A C++ to program to show 2D wind mill


#include<stdio.h>
#include<graphics.h>
#include<math.h>
void wind(float x[7],float y[7]);
int main()
{
int gd=DETECT,gm;
float x[7],y[7],maxx,maxy,xw1,yw1,xw2,yw2;
float theta=30;
initgraph(&gd,&gm,”c:\\tc\\bgi”);
maxx=getmaxx();
maxy=getmaxy();
x[0]=maxx/2;
y[0]=maxy/2;
x[1]=y[4]=x[2]=-90;
y[6]=y[5]=y[1]=60;
y[2]=35;
y[3]=-100;
x[4]=20;
x[3]=0;
x[5]=90;
x[6]=65;
theta=theta*22/7/180;
while(kbhit()==0)
{
wind(x,y);
xw1=cos(theta)*x[1]+sin(theta)*y[1];
yw1=-sin(theta)*x[1]+cos(theta)*y[1];
xw2=cos(theta)*x[2]+sin(theta)*y[2];
yw2=-sin(theta)*x[2]+cos(theta)*y[2];
x[1]=xw1;
y[1]=yw1;
x[2]=xw2;
y[2]=yw2;
xw1=cos(theta)*x[3]+sin(theta)*y[3];
yw1=-sin(theta)*x[3]+cos(theta)*y[3];
xw2=cos(theta)*x[4]+sin(theta)*y[4];
yw2=-sin(theta)*x[4]+cos(theta)*y[4];
x[3]=xw1;
y[3]=yw1;
x[4]=xw2;
y[4]=yw2;
xw1=cos(theta)*x[5]+sin(theta)*y[5];
yw1=-sin(theta)*x[5]+cos(theta)*y[5];
xw2=cos(theta)*x[6]+sin(theta)*y[6];
yw2=-sin(theta)*x[6]+cos(theta)*y[6];
x[5]=xw1;
y[5]=yw1;
x[6]=xw2;
y[6]=yw2;
delay(50);
cleardevice();
}
closegraph();
}
void wind(float x[7],float y[7])
{
cleardevice();
line(x[0],y[0],x[0]-50,y[0]+200);
line(x[0],y[0],x[0]+50,y[0]+200);
line(x[0]-60,y[0]+200,x[0]+60,y[0]+200);
line(x[0],y[0],x[0]+x[1],y[0]-y[1]);
line(x[0],y[0],x[0]+x[2],y[0]-y[2]);
line(x[0]+x[1],y[0]-y[1],x[0]+x[2],y[0]-y[2]);
line(x[0],y[0],x[0]+x[3],y[0]-y[3]);
line(x[0],y[0],x[0]+x[4],y[0]-y[4]);
line(x[0]+x[3],y[0]-y[3],x[0]+x[4],y[0]-y[4]);
line(x[0],y[0],x[0]+x[5],y[0]-y[5]);
line(x[0],y[0],x[0]+x[6],y[0]-y[6]);
line(x[0]+x[5],y[0]-y[5],x[0]+x[6],y[0]-y[6]);
}