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词条 getaspectratio
释义

§ 词条解释

函数名: getaspectratio

功 能: 返回当前图形模式的纵横比

用 法: void far getaspectratio (int far *xasp, int far *yasp);

§ 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 xasp, yasp, midx, midy;

/* initialize graphics and local variables */

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

/* read result of initialization */

errorcode = graphresult();

/* an error occurred */

if (errorcode != grOk)

{

printf("Graphics error: %s\",

grapherrormsg(errorcode));

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

getch();

/* terminate with an error code */

exit(1);

}

midx = getmaxx() / 2;

midy = getmaxy() / 2;

setcolor(getmaxcolor());

/* get current aspect ratio settings */

getaspectratio(&xasp, &yasp);

/* draw normal circle */

circle(midx, midy, 100);

getch();

/* draw wide circle */

cleardevice();

setaspectratio(xasp/2, yasp);

circle(midx, midy, 100);

getch();

/* draw narrow circle */

cleardevice();

setaspectratio(xasp, yasp/2);

circle(midx, midy, 100);

/* clean up */

getch();

closegraph();

return 0;

}

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更新时间:2024/12/22 17:46:23