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cleardevice

By Veronica Murray,2014-08-27 18:39
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cleardevice

函数名: cleardevice

     : 清除图形屏幕

     : #include <graphics.h>

     void far cleardevice(void); 程序例:

    #include <graphics.h>

    #include <stdlib.h>

    #include <stdio.h>

    #include <conio.h>

    int main(void)

    {

     /* request auto detection */

     int gdriver = DETECT, gmode, errorcode;

     int midx, midy;

     /* initialize graphics and local variables */

     initgraph(&gdriver, &gmode, "");

     /* read result of initialization */

     errorcode = graphresult();

     if (errorcode != grOk) /* an error occurred */

     {

     printf("Graphics error: %s\n", grapherrormsg(errorcode));

     printf("Press any key to halt:");

     getch();

     exit(1); /* terminate with an error code */

     }

     midx = getmaxx() / 2;

     midy = getmaxy() / 2;

     setcolor(getmaxcolor());

     /* for centering screen messages */

     settextjustify(CENTER_TEXT, CENTER_TEXT);

     /* output a message to the screen */

     outtextxy(midx, midy, "press any key to clear the screen:");

     /* wait for a key */

     getch();

     /* clear the screen */

     cleardevice();

     /* output another message */

     outtextxy(midx, midy, "press any key to quit:");

     /* clean up */

     getch();

     closegraph();

     return 0;

    }

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