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Draw a line in C++ graphics

  • Difficulty Level : Easy
  • Last Updated : 25 Jan, 2018

graphics.h library is used to include and facilitate graphical operations in program. graphics.h functions can be used to draw different shapes, display text in different fonts, change colors and many more. Using functions of graphics.h you can make graphics programs, animations, projects and games. You can draw circles, lines, rectangles, bars and many other geometrical figures. You can change their colors using the available functions and fill them.


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For line 1, Input : x1 = 150, y1 = 150, x2 = 450, y2 = 150
For line 2, Input : x1 = 150, y1 = 200, x2 = 450, y2 = 200
For line 2, Input : x1 = 150, y1 = 250, x2 = 450, y2 = 250
Output :

Explanation :The header file graphics.h contains line() function which is described below :

Declaration : void line(int x1, int y1, int x2, int y2);

line function is used to draw a line from a point(x1,y1) to point(x2,y2) i.e. (x1,y1) and (x2,y2) are end points of the line.The code given below draws a line.

// C++ Implementation for drawing line
#include <graphics.h>
// driver code
int main()
    // gm is Graphics mode which is a computer display
    // mode that generates image using pixels.
    // DETECT is a macro defined in "graphics.h" header file
    int gd = DETECT, gm;
    // initgraph initializes the graphics system
    // by loading a graphics driver from disk
    initgraph(&gd, &gm, "");
    // line for x1, y1, x2, y2
    line(150, 150, 450, 150);
    // line for x1, y1, x2, y2
    line(150, 200, 450, 200);
    // line for x1, y1, x2, y2
    line(150, 250, 450, 250);
    // closegraph function closes the graphics
    // mode and deallocates all memory allocated
    // by graphics system .


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