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# Program to draw a line using Cartesian Slope-Intercept Equation

Posted By: Easy Tutor     Category: C++ Programming     Views: 17569

## Code for Program to draw a line using Cartesian Slope-Intercept Equation in C++ Programming

``` # include <iostream.h>
# include <graphics.h>
# include    <conio.h>
# include     <math.h>

void show_screen( );

void slope_intercept_line(constint,constint,constint,constint);

int main( )
{
int driver=VGA;
int mode=VGAHI;

int x_1=0;
int y_1=0;

int x_2=0;
int y_2=0;

do
{
show_screen( );

gotoxy(8,10);
cout<<"Coordinates of Point-I (x1,y1) :";

gotoxy(8,11);
cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

gotoxy(12,13);
cout<<"Enter the value of x1 = ";
cin>>x_1;

gotoxy(12,14);
cout<<"Enter the value of y1 = ";
cin>>y_1;

gotoxy(8,18);
cout<<"Coordinates of Point-II (x2,y2) :";

gotoxy(8,19);
cout<<"ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ";

gotoxy(12,21);
cout<<"Enter the value of x2 = ";
cin>>x_2;

gotoxy(12,22);
cout<<"Enter the value of y2 = ";
cin>>y_2;

initgraph(&driver,&mode,"..\\Bgi");

setcolor(15);
slope_intercept_line(x_1,y_1,x_2,y_2);

setcolor(15);
outtextxy(110,460,"Press <Enter> to continue or any other key to exit.");

int key=int(getch( ));

if(key!=13)
break;
}
while(1);

return 0;
}

/*************************************************************************//*************************************************************************///------------------------  Funcion Definitions  ------------------------///*************************************************************************//*************************************************************************//*************************************************************************///------------------------  slope_intercept_line( )  --------------------///*************************************************************************/void slope_intercept_line(constint x_1,constint y_1,
constint x_2,constint y_2)
{
int color=getcolor( );

if(x_1!=x_2)
{
float x=x_1;
float y=y_1;

float dx=(x_2-x_1);
float dy=(y_2-y_1);

float m=(dy/dx);
float b=(y-(m*x));

if(abs(dx)>=abs(dy))
{
float x_inc=((x_2>=x_1)?1:-1);

putpixel(x,y,color);

while((int)(x+0.5)!=x_2)
{
x+=x_inc;
y=((m*x)+b);

putpixel((int)(x+0.5),(int)(y+0.5),color);
}
}

else
{
float y_inc=((y_2>=y_1)?1:-1);

putpixel(x,y,15);

while((int)(y+0.5)!=y_2)
{
y+=y_inc;
x=((1/m)*(y-b));

putpixel((int)(x+0.5),(int)(y+0.5),color);
}
}
}

else
{
int x=x_1;
int y=y_1;

int y_inc=((y_2>=y_1)?1:-1);

putpixel(x,y,color);

while(y!=y_2)
{
y+=y_inc;

putpixel(x,y,color);
}
}
}

/*************************************************************************///--------------------------  show_screen( )  ---------------------------///*************************************************************************/void show_screen( )
{
restorecrtmode( );
textmode(C4350);

cprintf("\n********************************************************************************");
cprintf("********************-                                      -********************");
cprintf("*-------------------- ");

textbackground(1);
cprintf(" Cartesian Slope Intercept Equation ");
textbackground(8);

cprintf(" --------------------*");
cprintf("*-******************-                                      -******************-*");
cprintf("*-****************************************************************************-*");

for(int count=0;count<42;count++)
cprintf("*-*                                                                          *-*");

gotoxy(1,46);
cprintf("*-****************************************************************************-*");
cprintf("*------------------------------------------------------------------------------*");
cprintf("********************************************************************************");

gotoxy(1,2);
}

```
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 Easy Tutor author of Program to draw a line using Cartesian Slope-Intercept Equation is from United States. Easy Tutor says Hello Friends,I am Free Lance Tutor, who helped student in completing their homework. I have 4 Years of hands on experience on helping student in completing their homework. I also guide them in doing their final year projects.I have share many programs on this website for everyone to use freely, if you need further assistance, than please contact me on easytutor.2ya [at the rate] gmail [dot] comI have special discount scheme for providing tutor services. I am providing tutor service to students from various contries, currently most of my students are from United States, India, Australia, Pakistan, Germany, UK and Canada. I am also here to expand my technical network to receive more opportunity in my career, make friends to help them in resolving their technical problem, learn and share my knowledge, If you like to be my friend, Please send me friend request.Thanks,Happy Programming :) View All Articles

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