DDA and Bresenham‘s algorithm

Write C++/Java program to draw line using DDA and Bresenham‘s algorithm. Inherit pixel
class and Use function overloading.

Author: chaudharishreyas

Diff for: linedraw.cpp

@@ -0,0 +1,145 @@
+/*Write C++/Java program to draw line using DDA and Bresenham‘s algorithm. Inherit pixel
+class and Use function overloading.*/
+#include<iostream>
+#include<graphics.h>
+using namespace std;
+class pixel
+{
+public:
+int x0,x1,y0,y1;
+void getdata();
+};
+void pixel ::getdata()
+{
+cout<<" Enter the starting coordinates of line "<<"\n";
+cin>>x0>>y0;
+cout<<" Enter the end coordinates of line "<<"\n";
+cin>>x1>>y1;
+}
+class linedraw :public pixel
+{
+public:
+void line();
+void line(int c);
+int sign(int a,int b);
+};
+  void linedraw ::line()
+  {
+   float dx,dy,x,y,steps;
+    dx=x1-x0;
+    dy=y1-y0;
+     if(fabs(dx)>fabs(dy))
+        steps=fabs(dx);
+    else
+        steps=fabs(dy);
+     dx=dx/steps;
+     dy=dy/steps;
+       x=x0;
+       y=y0;
+    for(int i=0;i<steps;i++)
+       {
+           putpixel(x,y,RED);
+           x+=dx;
+        y+=dy;
+       }
+
+ }
+   int linedraw :: sign(int a,int b)
+  {
+  if(a<b)
+  return 1;
+  else
+  return -1;
+  }
+  
+ void linedraw ::line(int c)
+ {
+   float x,y,dx,dy,s1,s2,temp,inter,e;
+   x=x0 ;
+   y=y0;
+   dx=x1-x0;
+   dy=y1-y0;
+   s1=sign(x0,x1);
+   s2=sign(y0,y1);
+   if(dy>dx)
+   {
+   temp=dx;
+   dx=dy;
+   dy=temp;
+   inter=1;
+   
+   } 
+   else
+   {
+   inter =0;
+   }
+  e=2*dy-dx;
+ for(int i=0;i<dx;i++)
+ {
+ putpixel(x,y,RED);
+  while(e>0)
+  {
+  if(inter==1)
+  {
+  x=x+s1;
+  
+  }
+  else
+  {
+  y=y+s2;
+  }
+  e=e-2*dx;
+  
+  
+  }
+ if(inter==1)
+ {
+ y=y+s2;
+ }
+ else
+ {
+ x=x+s1;
+ }
+ e=e+2*dy;
+ 
+ }
+ 
+ 
+} 
+ 
+ int main()
+ {
+ int gdriver=DETECT,gmode;
+ initgraph(&gdriver,&gmode,NULL);
+ 
+ linedraw obj;
+ setbkcolor(WHITE);
+ int x;
+      
+    do
+    {
+    cout<<"1.DDA\n2.Breshanam\n3.Exit"<<endl;
+    cout<<"Enter your choice:";
+    cin>>x;
+    switch(x)
+    {
+    case 1 : 
+           obj.getdata();
+             obj.line();
+             break;
+    case 2 : 
+            obj.getdata();
+             obj.line(2);
+             break;
+    case 3 : exit(1);
+    }
+    } 
+    while(x=3);                
+    return 0;
+    }
+
+ 
+ 
+ 
+ 
+