Program to implement Bresenhams Line Drawing Algorithm

Program to implement Bresenhams Line Drawing Algorithm #include<iostream.h> #include<graphics.h> #include<conio.h> #include<math.h> #include<dos.h> #include<stdlib.h> #include<stdio.h> class lines { private: int length,x1,y1,x2,y2,x,y,dx,dy,wx,wy,w,width; public: lines(); //Constructor void showline(); int sign(int); }; int lines::sign(int xx) { if(xx<0) return -1; if(xx==0) return 0; if(xx>0) return 1; return 0; } lines::lines() { x=0;y=0; cout<<" "Enter The Co-Ordinates (x1,y1) ":="; cin>>x1>>y1; cout<<" "Enter The Co-Ordinates (x2,y2) ":="; cin>>x2>>y2; cout<<" "Enter The Width Of The Line ":="; cin>>width; } void lines::showline() { char *s; int s1,s2,ic; float temp; x=x1;y=1; w=width; if(y2-y1) wx=((w-1)/2)*(sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))/abs(y2-y1)); if(x2-x1) wy=((w-1)/2)*(sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1))/abs(x2-x1)); dx=abs(x2-x1); dy=abs(y2-y1); s1=sign(x2-x1); s2=sign(y2-y1); if(dy>dx) wy=wx; if(dy>dx) { temp=dy; dy=dx; dx=temp; ic=1; } else ic=0; float d=2*dy-dx; setcolor(0); for(int i=1;i<=dx;i++) { for(int j=0;j<wy;j++) putpixel((x+320),480-(y+240+j),5); for(j=0;j<wy;j++) putpixel((x+320),480-(y+240-j),5); putpixel((x+320),480-(y+240),5); while(d>=0) { if(ic==1) x+=s1; else y+=s2; d-=2*dx; } if(ic==1) y+=s2; else x+=s1; d+=2*dy; } setcolor(15); outtextxy(20,10,"The Points Are:="); sprintf(s,"A(%d,%d)",x1,y1); outtextxy(20,20,s); sprintf(s,"B(%d,%d)",x2,y2); outtextxy(20,30,s); getch(); } void main() { int gd=DETECT,gm,i,j,xx=200,xxx=470; clrscr(); lines a; char *mess[]={"B","R","E","S","E","N","H","A","M","'","S"," ","L","I","N","E"," ","A","L","G","O","R","I","T","H","M"}; initgraph(&gd,&gm,"..\bgi"); cleardevice(); rectangle(120,40,320,240); rectangle(320,40,520,240); rectangle(120,240,320,440); rectangle(320,240,520,440); for(i=0,j=25;i<14,j>=12;i++,j--) { xx+=10; outtextxy(xx,10,mess[i]); xxx-=10; outtextxy(xxx,10,mess[j]); delay(100); } for(i=130;i<=510;i+=10) for(j=50;j<=430;j+=10) putpixel(i,j,15); for(i=130;i<=510;i+=10) { if(i==320) continue; outtextxy(i,237,"+"); } for(i=50;i<=430;i+=10) { if(i==240) continue; outtextxy(317,i,"-"); } outtextxy(310,230,"O"); outtextxy(530,240,"X"); outtextxy(320,450,"-Y"); outtextxy(100,240,"-X"); outtextxy(320,30,"Y"); a.showline(); closegraph(); }