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# Program of scaling about reference point

Posted By: Easy Tutor     Category: C++ Programming     Views: 8702

## Code for Program of scaling about reference point in C++ Programming

```# include <iostream.h>
# include <conio.h>
# include <graphics.h>
# include <math.h>

char IncFlag;
int PolygonPoints[4][2] =
{{10,10},{10,100},{100,100},{100,10}};

float Sx=0.5;
float Sy=2.0;

int RefX=55;
int RefY=55;
void PolyLine()
{
int iCnt;
cleardevice();
line(0,240,640,240);
line(320,0,320,480);
for (iCnt=0; iCnt<4; iCnt++)
{
line(320+PolygonPoints[iCnt][0],240-PolygonPoints[iCnt][1],
320+PolygonPoints[(iCnt+1)%4][0],240-PolygonPoints[(iCnt+1)%4][1]);
}
}

void Scale()
{
int iCnt;
int Tx,Ty;
cout<<endl;
for (iCnt=0; iCnt<4; iCnt++)
{
PolygonPoints[iCnt][0] *= Sx;
PolygonPoints[iCnt][0] += (1-Sx)*RefX;
PolygonPoints[iCnt][1] *= Sy;
PolygonPoints[iCnt][1] += (1-Sy)*RefY;
}
}

void main()
{
int gDriver = DETECT, gMode;
int iCnt;
initgraph(&gDriver, &gMode, "C:\\TC\\BGI");
PolyLine();
getch();
Scale();
PolyLine();
getch();
}
```
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