📜  C语言中的getpixel()函数

📅  最后修改于: 2021-05-25 21:58:05             🧑  作者: Mango

头文件graphics.h包含getpixel()函数,该函数返回在位置(x,y)处存在的像素的颜色。

句法 :

int getpixel(int x, int y);

注意:默认情况下,屏幕为黑色,因此(0,0)处像素的颜色为黑色。

以下是getpixel()函数。

// C Implementation for getpixel()
#include 
#include 
  
// 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;
}

输出 :

说明:由于屏幕上未画任何东西,并且默认情况下屏幕为黑色,因此(0,0)处像素的颜色为黑色,因为0表示黑色。

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