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# Program of reflection on any line

Posted By: Easy Tutor     Category: C++ Programming     Views: 19960

## Code for Program of reflection on any line in C++ Programming

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

char IncFlag;
int PolygonPoints[3][2] =
{{10,100},{110,100},{110,200}};

int x1=10;
int y1=10;
int x2=100;
int y2=100;

void PolyLine()
{
int iCnt;
cleardevice();
line(0,240,640,240);
line(320,0,320,480);
for (iCnt=0; iCnt<3; iCnt++)
{
line(PolygonPoints[iCnt][0],PolygonPoints[iCnt][1],
PolygonPoints[(iCnt+1)%3][0],PolygonPoints[(iCnt+1)%3][1]);
}
}
void Reflect()
{
float Angle,Slope,Hx,Hy,B;
int iCnt;
int Tx,Ty;

Angle = atan((y2-y1)/(x2-x1));
Angle *= (M_PI)/180.0;

Slope = tan(Angle);
B = y2 - x2*Slope;

Hx = -B*sin(2.0 * Angle);
Hy = B*(cos(2.0 * Angle)+1);

for (iCnt=0; iCnt<3; iCnt++)
{
Tx = PolygonPoints[iCnt][0];
Ty = PolygonPoints[iCnt][1];

PolygonPoints[iCnt][0] = Tx*cos(2.0*Angle);
+ Ty*sin(2.0*Angle) + Hx;

PolygonPoints[iCnt][0] = Tx*sin(2.0*Angle);
- Ty*cos(2.0*Angle) + Hy;
}
}

void main()
{
int gDriver = DETECT, gMode;
int iCnt;
initgraph(&gDriver, &gMode, "C:\\TC\\BGI");
for (iCnt=0; iCnt<3; iCnt++)
{
PolygonPoints[iCnt][0] += 320;
PolygonPoints[iCnt][1] = 240 - PolygonPoints[iCnt][1];
}
PolyLine();
getch();
Reflect();
PolyLine();
getch();
}
```
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