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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