setviewport

函數名: setviewport

功 能: 為圖形輸出設置當前視口

用 法: void far setviewport(int left, int top, int right, int bottom, int clipflag);

程序例:

#include

#include

#include

#include

#define CLIP_ON 1

int main(void)

{

int gdriver = DETECT, gmode, errorcode;

initgraph(&gdriver, &gmode, "");

errorcode = graphresult();

if (errorcode != grOk)

{

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

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

getch();

exit(1);

}

setcolor(getmaxcolor());

outtextxy(0, 0, "* <-- (0, 0) in default viewport");

setviewport(50, 50, getmaxx()-50, getmaxy()-50, CLIP_ON);

outtextxy(0, 0, "* <-- (0, 0) in smaller viewport");

getch();

closegraph();

return 0;

}