#include<iostream>
#include<stdio.h>
#include<graphics.h>
using namespace std;

class pixel{
protected:
	int x1,x2,y1,y2;
    void accept();
};
void pixel::accept(){
cout<<"Enter the starting coordinates"<<endl;
cin>>x1;
cin>>y1;
cout<<"Enter the destination coordinates"<<endl;
cin>>x2;
cin>>y2;
}

class draw : public pixel{
private:
	void dotted();
	void dashed();
	void dash_dott();
	void solid();
public:
	void normal_call();
};

void draw::dotted(){
int gd=DETECT,gm;
initgraph(&gd,&gm,NULL);
int dx,dy,steps;
if(x2>x1){
	dx=x2-x1;
}
else{
   dx=x1-x2;
}
if(y2>y1){
	dy=y2-y1;
}
else{
	dy=y1-y2;
}
if(dx>=dy)
	steps=dx;
else
	steps=dy;
dx=dx/steps;
int sx;
if(dx>=0)
	sx=1;
else
	sx=-1;
	dy=dy/steps;
int sy;
if(dy>=0)
	sy=1;
else
	sy=-1;
float x=x1+0.5*sx;
float y=y1+0.5*sy;
int i=0;
	while(i<=steps){
	  if(i%2==0){
	    putpixel(int(x),int(y),3);
	 }
		x=x+dx;
		y=y+dy;
		i++;
  }
getch();
closegraph();
}
void draw::dashed(){
int gd=DETECT,gm;
initgraph(&gd,&gm,NULL);
int dx,dy,steps;
if(x2>x1){
dx=x2-x1;
}
else{
dx=x1-x2;
}
if(y2>y1){
dy=y2-y1;
}
else{
dy=y1-y2;
}
if(dx>=dy)
steps=dx;
else
steps=dy;
dx=dx/steps;
int sx;
if(dx>=0)
sx=1;
else
sx=-1;
dy=dy/steps;
int sy;
if(dy>=0)
sy=1;
else
sy=-1;
float x=x1+0.5*sx;
float y=y1+0.5*sy;
int i=0;
while(i<=steps){
if(i%9<2){
	///Do something
}
else if(i%9<6){
putpixel(int(x),int(y),3);
}
else
	putpixel(int(x),int(y),3);
	x=x+dx;
	y=y+dy;
	i++;
}
getch();
closegraph();
}

void draw::dash_dott(){
int gd=DETECT,gm;
initgraph(&gd,&gm,NULL);
int dx,dy,steps;
if(x2>x1){
dx=x2-x1;
}
else{
dx=x1-x2;
}
if(y2>y1){
 dy=y2-y1;
}
else{
 dy=y1-y2;
}
if(dx>=dy)
steps=dx;
else
steps=dy;
dx=dx/steps;
int sx;
if(dx>=0)
sx=1;
else
sx=-1;
dy=dy/steps;
int sy;
if(dy>=0)
sy=1;
else
sy=-1;
float x=x1+0.5*sx;
float y=y1+0.5*sy;
int i=0;
while(i<=steps){
if(i%9<2){
	///Do something
}
 else if(i%9<6){
putpixel(int(x),int(y),3);
}
else if(i%9==7){
	///Do something
}
else
	putpixel(int(x),int(y),3);
	x=x+dx;
	y=y+dy;
	i++;
}
getch();
closegraph();
}


void draw::solid()
{
int gd=DETECT,gm;
initgraph(&gd,&gm,NULL);
int dx,dy,steps;
if(x2>x1){
 dx=x2-x1;
}
else{
  dx=x1-x2;
}
if(y2>y1){
 dy=y2-y1;
}
else{
 dy=y1-y2;
}
if(dx>=dy)
  steps=dx;
else
  steps=dy;
  dx=dx/steps;
int sx;
if(dx>=0)
 sx=1;
else
 sx=-1;
 dy=dy/steps;
int sy;
if(dy>=0)
  sy=1;
else
 sy=-1;
float x=x1+0.5*sx;
float y=y1+0.5*sy;
int i=0;
while(i<=steps){
	putpixel(int(x),int(y),3);
	x=x+dx;
	y=y+dy;
	i++;
}
getch();
closegraph();
}

void draw::normal_call(){
accept();
int ch;
do{
cout<<"1.Dotted   2.Dashed    3.Dash-dott     4.Solid(Regular)    5.Exit"<<endl;
cin>>ch;
switch(ch){
	case 1:
		dotted();
		restorecrtmode();
    break;
	case 2:
		dashed();
		restorecrtmode();
	break;
	case 3:
		dash_dott();
		restorecrtmode();
	break;
	case 4:
		solid();
		restorecrtmode();
	break;
  }
}while(ch!=5);
}

int main(){
draw d;
d.normal_call();
return 0;
}