C语言函数大全(i开头)

文章作者 100test 发表时间 2007:03:10 17:26:05
来源 100Test.Com百考试题网

函数名: imagesize
功 能: 返回保存位图像所需的字节数
用 法: unsigned far imagesize(int left, int top, int right, int bottom).
程序例:
#include
#include
#include
#include
#define ARROW_SIZE 10
void draw_arrow(int x, int y).
int main(void)
{
/* request autodetection */
int gdriver = DETECT, gmode, errorcode.
void *arrow.
int x, y, maxx.
unsigned int size.
/* 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 */
}
maxx = getmaxx().
x = 0.
y = getmaxy() / 2.
/* draw the image to be grabbed */
draw_arrow(x, y).
/* calculate the size of the image */
size = imagesize(x, y-ARROW_SIZE, x (4*ARROW_SIZE), y ARROW_SIZE).
/* allocate memory to hold the image */
arrow = malloc(size).
/* grab the image */
getimage(x, y-ARROW_SIZE, x (4*ARROW_SIZE), y ARROW_SIZE, arrow).
/* repeat until a key is pressed */
while (!kbhit())
{
/* erase old image */
putimage(x, y-ARROW_SIZE, arrow, XOR_PUT).
x = ARROW_SIZE.
if (x >= maxx)
x = 0.
/* plot new image */
putimage(x, y-ARROW_SIZE, arrow, XOR_PUT).
}
/* clean up */
free(arrow).
closegraph().
return 0.
}
void draw_arrow(int x, int y)
{
/* draw an arrow on the screen */
moveto(x, y).
linerel(4*ARROW_SIZE, 0).
linerel(-2*ARROW_SIZE, -1*ARROW_SIZE).
linerel(0, 2*ARROW_SIZE).
linerel(2*ARROW_SIZE, -1*ARROW_SIZE).
}