imagesize

编辑:离愁网互动百科 时间:2019-11-22 16:46:35
编辑 锁定
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中文名
imagesize
外文名
 imagesize
功 能
返回保存位图像所需的字节数

imagesize基本信息

编辑
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);
头文件: conio.h

imagesize程序举例

编辑
#include <stdio.h>
#include <conio.h>
#include <dos.h>
#include <graphics.h>
#define ARROW_SIZE 10
void draw_arrow(int x,int y);
int main(void)
{
int gdriver,gmode,errorcode;
int x,y,maxx;
int *arrow;
unsigned size;
/* initialize graphics and local variables */
gdriver=DETECT;
initgraph(&gdriver,&gmode,"");
/* read the result of initialization */
errorcode=graphresult();
if(errorcode!=grOk) /* an error occurred */
{
printf("Graphics error: %s\n",grapherrormsg(errorcode));
getch();
exit(1); /* terminate with an error code */
}
maxx=getmaxx();
x=0;
y=getmaxy()/2;
/* calculate the size of the image */
size=imagesize(x,y-ARROW_SIZE,x+2*ARROW_SIZE,y+ARROW_SIZE);
/* allocate memory to hold the image */
arrow=(int*)malloc(size);
/* grab the image */
getimage(x,y-ARROW_SIZE,x+2*ARROW_SIZE,y+ARROW_SIZE,arrow);
/* repeat until a key is pressed */
while(!kbhit())
{
/* plot new image */
draw_arrow(x,y);
delay(400); /* delay time */
/* erase old image */
putimage(x,y-ARROW_SIZE,arrow,AND_PUT);
x+=2*ARROW_SIZE;
if(maxx-x<2*ARROW_SIZE) x=0;
}
/* clean up */
free(arrow);
closegraph();
return 0;
}
/* draw an arrow on the screen */
void draw_arrow(int x,int y)
{
moveto(x,y);
linerel(0,-1*ARROW_SIZE);
linerel(2*ARROW_SIZE,ARROW_SIZE);
linerel(-2*ARROW_SIZE,ARROW_SIZE);
linerel(0,-1*ARROW_SIZE);
}
词条标签:
计算机学