getpixel() function in C
The header file graphics.h contains getpixel() function which returns the color of pixel present at location (x, y).
Syntax :
int getpixel(int x, int y);
Note : By default the screen is BLACK, therefore color of pixel at (0,0) is BLACK.
Below is the implementation of getpixel() function.
// C Implementation for getpixel() #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, color; char arr[50]; // initgraph initializes the // graphics system by loading a // graphics driver from disk initgraph(&gd, &gm, "" ); // getpixel function color = getpixel(0, 0); // sprintf stands for “String print”. // Instead of printing on console, // it store output on char buffer // which are specified in sprintf sprintf (arr, "color of pixel at (0,0) = %d" , color); // outtext function displays text // at current position. outtext(arr); getch(); // closegraph function closes the // graphics mode and deallocates // all memory allocated by // graphics system . closegraph(); return 0; } |
Output :
Explanation : As nothing is drawn anything on screen and by default screen is BLACK, therefore color of pixel at (0, 0) is BLACK as 0 indicates BLACK color.
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