C语言中的imagesize（）函数-yiteyi-C++库

头文件显示图形。h包含 imagesize（） 函数，返回存储位图像所需的字节数。 语法：

null

unsigned int imagesize(int left, int top,
                    int right, int bottom);

where,
left, top, right, and bottom
define the area of the screen 
in which image is stored.

下面是imagesize（）函数的实现。

                     // C Implementation for imagesize()                   
                     #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, bytes;                   
                                         char                               arr[100];                   
                             
                                         // initgraph initializes the                   
                                         // graphics system by loading a                   
                                         // graphics driver from disk                   
                                         initgraph(&gd, &gm,                               ""                               );                   
                             
                                         // Draws a circle with center at                   
                                         // (200, 200) and radius as 50.                   
                                         circle(200, 200, 50);                   
                             
                                         // draws a line with 2 points                   
                                         line(150, 200, 250, 200);                   
                             
                                         // draws a line with 2 points                   
                                         line(200, 150, 200, 250);                   
                             
                                         // imagesize function                   
                                         bytes = imagesize(150, 150, 250, 250);                   
                             
                                         // sprintf stands for “String print”.                   
                                         // Instead of printing on console,                   
                                         // it store output on char buffer                   
                                         // which are specified in sprintf                   
                                         sprintf                               (arr,                               "Number of bytes required "                   
                                         "to store required area = %d"                               , bytes);                   
                             
                                         // outtext function displays text                   
                                         // at current position.                   
                                         outtextxy(20, 280, arr);                   
                             
                                         getch();                   
                             
                                         // closegraph function closes the                   
                                         // graphics mode and deallocates                   
                                         // all memory allocated by                   
                                         // graphics system .                   
                                         closegraph();                   
                             
                                         return                               0;                   
                     }                   

输出：

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