Algorithm for reflection and translation for triangle in computer graphics?

Answer 1

//reflection for triangle

# include <iostream.h>

# include <conio.h>

# include <graphics.h>

# include <math.h>

char IncFlag;

int PolygonPoints[3][2] =

{{10,100},{110,100},{110,200}};

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;

int iCnt;

int Tx,Ty;

cout<<endl;

for (iCnt=0; iCnt<3; iCnt++)

PolygonPoints[iCnt][1] = (480 - PolygonPoints[iCnt][1]);

}

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();

}