头文件graphics.h包含getarccoords()函数,该函数用于获取最近绘制的弧的坐标。 arccoordstype是预定义的结构,定义如下:
用法:
struct arccoordstype { // center point of arc int x, y; // start position int xstart, ystart; // end position int xend, yend; };
注意:类型为arccoordstype的结构变量的地址传递给函数getarccoords。
用法:
void getarccoords(struct arccoordstype *var);
例:
Input:x = 250, y = 200, s_angle = 0 , e_angle = 90, radius = 100 Output:
下面是getarccoords()函数的实现
// C Implementation for getarccoords()
#include <graphics.h>
#include <stdio.h>
// driver code
int main()
{
// gm is Graphics mode which is
// a computer display mode that
// generates image using pixels.
// DETECT is a macro defined in
// "graphics.h" header file
int gd = DETECT, gm;
// p is structure variable
// of type arccoordstype
struct arccoordstype p;
char arr[100];
// initgraph initializes the
// graphics system by loading a
// graphics driver from disk
initgraph(&gd, &gm, "");
// arc function is used to draw an
// arc the first 2 arguments are
// center of arc 3rd and 4th
// arguments are starting and
// ending angles. Last argument
// is the radius.
arc(250, 200, 0, 90, 100);
// getarccoords function which takes
// address of a structure variable of
// type arccoordstype as an argument.
getarccoords(&p);
// sprintf stands for “String print”.
// Instead of printing on console, it
// store output on char buffer which
// are specified in sprintf
sprintf(arr, "(%d, %d)", p.xstart,
p.ystart);
// outtext function displays text
// at current position.
outtextxy(360, 195, arr);
sprintf(arr, "(%d, %d)", p.xend,
p.yend);
outtextxy(245, 85, arr);
getch();
// closegraph function closes the
// graphics mode and deallocates
// all memory allocated by
// graphics system .
closegraph();
return 0;
}
输出:
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注:本文由纯净天空筛选整理自Sahil_Bansall大神的英文原创作品 getarcoords() function in C。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。