Write a program to draw a polygon using dda algorithm in c language?

Answer 1

# include <graphics.h> # include <math.h> # include <conio.h> # include <iostream.h> void DDALine(int x1,int y1,int x2,int y2,int iColor); void main() { int gDriver=DETECT,gMode; int x1,x2,y1,y2,iColor; initgraph(&gDriver,&gMode,"c:\\tc\\bgi"); cleardevice(); cout<<endl<<"Enter x1 : "; cin>>x1; cout<<"Enter y1 : "; cin>>y1; cout<<endl<<"Enter x2 : "; cin>>x2; cout<<"Enter y2 : "; cin>>y2; cout<<endl<<"Enter COLOR : "; cin>>iColor; cleardevice(); DDALine(320,1,320,480,12); DDALine(1,240,640,240,12); circle(320,240,2); DDALine(320+x1,240-y1,320+x2,240-y2,iColor%16); getch(); } void DDALine(int x1,int y1,int x2,int y2,int iColor) { float dX,dY,iSteps; float xInc,yInc,iCount,x,y; dX = x1 - x2; dY = y1 - y2; if (fabs(dX) > fabs(dY)) { iSteps = fabs(dX); } else { iSteps = fabs(dY); } xInc = dX/iSteps; yInc = dY/iSteps; x = x1; y = y1; circle(x,y,1); for (iCount=1; iCount<=iSteps; iCount++) { putpixel(floor(x),floor(y),iColor); x -= xInc; y -= yInc; } circle(x,y,1); return; }

Answer 2

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Answer 3

You will need to have some computer knowledge to start this. You can find some examples to help out online.