linerel() function in C
The header file graphics.h contains linerel() function which draws a line from the current position (x_pos1, y_pos1) to a point that is at a relative distance (x, y) from the Current Position, then advances the Current Position by (x, y).
Note : Use getx() and gety() to find the current position.
Syntax :
linerel(int x, int y); The end position is calculated as : x_pos2 = x_pos1 + x; y_pos2 = y_pos1 + y;
Examples :
Input : x_pos1 = 0, y_pos1 =0, x = 200, y = 100 Output : Input : x_pos1 = 100, y_pos1 = 150, x = 150, y = 60 Output :
CASE 1 : When the current position is at origin i.e, (0,0)
Below is the implementation of linerel() function in C:
// C Implementation for linerel() #include <graphics.h> #include<stdio.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; char arr[100]; // initgraph initializes the // graphics system by loading a // graphics driver from disk initgraph(&gd, &gm, "" ); // linerel function linerel(200, 100); // sprintf stands for “String print”. // Instead of printing on console, // it store output on char buffer // which are specified in sprintf sprintf (arr, "Current x position = %d and " "y position = %d" , getx(), gety()); // outtext function displays // text at current position. outtextxy(100, 150, arr); getch(); // closegraph function closes the // graphics mode and deallocates // all memory allocated by // graphics system . closegraph(); return 0; } |
Output :
CASE 2 : When the current position is other than origin, (100, 150).
Below is the implementation of linerel() function in C:
// C Implementation for linerel() #include <graphics.h> #include<stdio.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; char arr[100]; // initgraph initializes the // graphics system by loading a // graphics driver from disk initgraph(&gd, &gm, "" ); // Change current position using // moveto function moveto(100, 150); // linerel function linerel(150, 60); // sprintf stands for “String print”. // Instead of printing on console, // it store output on char buffer // which are specified in sprintf sprintf (arr, "Current x position = %d and " "y position = %d" , getx(), gety()); // outtext function displays // text at current position. outtextxy(100, 150, arr); getch(); // closegraph function closes the // graphics mode and deallocates // all memory allocated by // graphics system . closegraph(); return 0; } |
Output :
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