萌新请教\pos与\an关联性的问题

对于已经通过\pos和\an固定好的字符，如何得到在另一种\an之下与其位置完全重合的\pos数值

比如先有了一个\an7的蛤，然后增加一个\an5的蛤，除了手工瞄准，可不可以通过算法计算\pos得出一个与其完全重合的\an5的蛤

以前写的，在我修的某个字幕中有用过来作特效。
已经考虑过\an标签、\pos标签、margin_l、margin_r、margin_v设置的情况(\move标签不适用)，非特殊情况下使用按理说没问题。
注意设置好字幕文件中的PlayResX、PlayResY属性，否则要在函数调用中传入字幕空间的长、宽。

用法：

!line_screen_pos_xy_tag(7)!    则输出   \an7\pos(xxx1, yyy1)
!line_screen_pos_xy_tag(3, 1920, 1080)!    则输出   \an3\pos(xxx2, yyy2)

附加功能
!line_screen_pos_xy(7)!    则输出两个值   xxx, yyy
!line_screen_ltrb_pos()!   则输出四个值  left, top, right, bottom  (计算内联坐标\pos后的四个边的值，不带边界阴影)
!line_screen_ltrb_pos_with_bord_shad()!   则输出四个值  left, top, right, bottom  (计算内联坐标\pos后的四个边的值，带边界阴影。这个函数没写在测试文件中，仅在下面列出)

其它的例子就看测试文件（注释掉样式为fx且层为1的行，就能看到原始行，也就能检查是否重合）。

1. function pos_map_vector(src_an, src_x, src_y, trg_an, trg_x, trg_y, width, height)
   
2.   local src_left, src_top, trg_left, trg_top;
   
3. 
   
4.   src_left = src_x - (src_an%3==1 and 0 or (src_an%3==2 and width/2 or width));
   
5.   src_top = src_y - (src_an<=3 and height or (src_an<=6 and height/2 or 0));
   
6.   
   
7.   trg_left = trg_x - (trg_an%3==1 and 0 or (trg_an%3==2 and width/2 or width));
   
8.   trg_top = trg_y - (trg_an<=3 and height or (trg_an<=6 and height/2 or 0));
   
9. 
   
10.   return trg_left - src_left, trg_top - src_top;
    
11. end
    
12. 
    
13. function line_screen_ltrb_pos(screen_width, screen_height)
    
14.   local vline = orgline;
    
15.   screen_width = screen_width or meta.res_x;
    
16.   screen_height = screen_height or meta.res_y;
    
17.   local src_an = vline.styleref.align;
    
18.   local trg_an = _G.tonumber(string.match(vline.text, "\\an%s*(%d)")) or src_an;
    
19.   local trg_x, trg_y = string.match(vline.text, "\\pos%(%s*(%-?[%d.]+)%s*,%s*(-?[%d.]+)%s*%)");
    
20.   if trg_x == nil or trg_y == nil then
    
21.     if trg_an == src_an then
    
22.       trg_x, trg_y = vline.x, vline.y;
    
23.     else
    
24.       trg_x = (trg_an%3==1 and vline.eff_margin_l or (trg_an%3==2 and (screen_width+vline.eff_margin_l-vline.eff_margin_r)/2 or screen_width-vline.eff_margin_r));
    
25.       trg_y = (trg_an<=3 and screen_height-line.eff_margin_v or (trg_an<=6 and screen_height/2 or line.eff_margin_v));
    
26.     end
    
27.   else
    
28.     trg_x, trg_y = _G.tonumber(trg_x), _G.tonumber(trg_y);
    
29.   end
    
30.   
    
31.   local dx, dy = pos_map_vector(src_an, vline.x, vline.y, trg_an, trg_x, trg_y, vline.right-vline.left, vline.bottom-vline.top);
    
32.   return vline.left + dx, vline.top + dy, vline.right + dx, vline.bottom + dy;
    
33. end
    
34. 
    
35. function line_screen_pos_xy(an, screen_width, screen_height)
    
36.   local vline = orgline;
    
37.   local left, top, right, bottom = line_screen_ltrb_pos(screen_width, screen_height);
    
38.   an = an or _G.tonumber(string.match(vline.text, "\\an%s*(%d)")) or vline.styleref.align;
    
39.   local x = (an%3==1 and left or (an%3==2 and (left+right)/2 or right));
    
40.   local y = (an<=3 and bottom or (an<=6 and (top+bottom)/2 or top));
    
41.   return x, y;
    
42. end
    
43. 
    
44. function line_screen_pos_xy_tag(an, screen_width, screen_height, precision)
    
45.   precision = precision or 2;
    
46.   local vline = orgline;
    
47.   local an_str = an and "\\an"..an or _G.table.concat({string.match(vline.text, "(\\an)%s*(%d)")}, "");
    
48.   local pfmt = string.format("%s\\pos(%%.%df,%%.%df)", an_str, precision, precision);
    
49.   return pfmt:format(line_screen_pos_xy(an, screen_width, screen_height));
    
50. end
    
51. 
    
52. -- ;附送方法
    
53. function line_screen_ltrb_pos_with_bord_shad(screen_width, screen_height)
    
54.   local vline = orgline;
    
55.   local left, top, right, bottom = line_screen_ltrb_pos(screen_width, screen_height);
    
56.   local bord = _G.tonumber(string.match(vline.text, "\\bord%s*(%-?[%d.]+)")) or vline.styleref.outline;
    
57.   local xshad = _G.tonumber(string.match(vline.text, "\\x?shad%s*(%-?[%d.]+)")) or vline.styleref.shadow;
    
58.   local yshad = _G.tonumber(string.match(vline.text, "\\y?shad%s*(%-?[%d.]+)")) or vline.styleref.shadow;
    
59.   left = left - bord - (xshad<0 and -xshad or 0);
    
60.   top = top - bord - (yshad<0 and -yshad or 0);
    
61.   right = right + bord + (xshad>0 and xshad or 0);
    
62.   bottom = bottom + bord + (yshad>0 and yshad or 0);
    
63.   return left, top, right, bottom;
    
64. end
    
65. 
    

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