有没有大佬懂下面嵌入式C语言画圆代码，特别是定义imax和sqmax，非常感谢！！

[weixin_43873384]

void LCD_FillCircle (U16 x0, U16 y0, U16 r) //填充圆 { U32 i; U32 imax = ((int)((int)r*707))/1000+1; U32 sqmax = (int)r*(int)r+(int)r/2; U16 x = r; LCD_DrawHLine(x0-r,y0,x0+r); for (i=1; i<= imax; i++) { if ((i*i+x*x) >sqmax) { if (x>imax) { LCD_DrawHLine (x0-i+1,y0+x, x0+i-1); LCD_DrawHLine (x0-i+1,y0-x, x0+i-1); } x--; } LCD_DrawHLine(x0-x,y0+i, x0+x); LCD_DrawHLine(x0-x,y0-i, x0+x); } }