C语言函数大全(s开头)(2)

文章作者 100test 发表时间 2007:03:10 17:25:35
来源 100Test.Com百考试题网

函数名: setvisualpage
功 能: 设置可见图形页号
用 法: void far setvisualpage(int pagenum).
程序例:
#include
#include
#include
#include
int main(void)
{
/* 0select a driver and mode that supports */
/* multiple pages. */
int gdriver = EGA, gmode = EGAHI, errorcode.
int x, y, ht.
/* 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 */
}
x = getmaxx() / 2.
y = getmaxy() / 2.
ht = textheight("W").
/* 0select the off screen page for drawing */
setactivepage(1).
/* draw a line on page #1 */
line(0, 0, getmaxx(), getmaxy()).
/* output a message on page #1 */
settextjustify(CENTER_TEXT, CENTER_TEXT).
outtextxy(x, y, "This is page #1:").
outtextxy(x, y ht, "Press any key to halt:").
/* 0select drawing to page #0 */
setactivepage(0).
/* output a message on page #0 */
outtextxy(x, y, "This is page #0.").
outtextxy(x, y ht, "Press any key to view page #1:").
getch().
/* 0select page #1 as the visible page */
setvisualpage(1).
/* clean up */
getch().
closegraph().
return 0.
}


函数名: setwritemode
功 能: 设置图形方式下画线的输出模式
用 法: void far setwritemode(int mode).
程序例:
#include
#include
#include
#include
int main()
{
/* request auto detection */
int gdriver = DETECT, gmode, errorcode.
int xmax, ymax.
/* 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 */
}
xmax = getmaxx().
ymax = getmaxy().
/* 0select XOR drawing mode */
setwritemode(XOR_PUT).
/* draw a line */
line(0, 0, xmax, ymax).
getch().
/* erase the line by drawing over it */
line(0, 0, xmax, ymax).
getch().
/* 0select overwrite drawing mode */
setwritemode(COPY_PUT).
/* draw a line */
line(0, 0, xmax, ymax).
/* clean up */
getch().
closegraph().
return 0.
}


函数名: signal