contoh program DDA

Program to implement DDA 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 ":=";