Codepoc.io is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
# include <iostream.h>
# include <conio.h>
# include <graphics.h>
# include <math.h>
char IncFlag;
int PolygonPoints[4][2] =
{{10,100},{110,100},{110,200},{10,200}};
void PolyLine()
{
int iCnt;
cleardevice();
line(0,240,640,240);
line(320,0,320,480);
for (iCnt=0; iCnt<4; iCnt++)
{
line(PolygonPoints[iCnt][0],PolygonPoints[iCnt][1],
PolygonPoints[(iCnt+1)%4][0],PolygonPoints[(iCnt+1)%4][1]);
}
}
void Rotate()
{
float Angle;
int iCnt;
int Tx,Ty;
cout<<endl;
Angle = 30.0*(22.0/7.0)/180.0;
for (iCnt=0; iCnt<4; iCnt++)
{
Tx = PolygonPoints[iCnt][0];
Ty = PolygonPoints[iCnt][1];
PolygonPoints[iCnt][0] = (Tx - 320)*cos(Angle) -
(Ty - 240)*sin(Angle) + 320;
PolygonPoints[iCnt][1] = (Tx - 320)*sin(Angle) +
(Ty - 240)*cos(Angle) + 240;
}
}
void main()
{
int gDriver = DETECT, gMode;
int iCnt;
initgraph(&gDriver, &gMode, \"C:\\\\TC\\\\BGI\");
for (iCnt=0; iCnt<4; iCnt++)
{
PolygonPoints[iCnt][0] += 320;
PolygonPoints[iCnt][1] = 240 - PolygonPoints[iCnt][1];
}
PolyLine();
getch();
Rotate();
PolyLine();
getch();
}