GetDistanceInTiles - Revision history

Batlin: Protected "GetDistanceInTiles" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

2010-04-14T22:44:02Z

Protected "GetDistanceInTiles" ([edit=sysop] (indefinite) [move=sysop] (indefinite))

Batlin at 22:43, 14 April 2010

2010-04-14T22:43:39Z

Batlin at 22:41, 14 April 2010

2010-04-14T22:41:23Z

Batlin: decompilation fix

2010-04-14T22:40:36Z

decompilation fix

Batlin: Created page with 'integer '''getDistanceInTiles'''(location ''A'', location ''B'');
This function will return 9999 if A.x or B.x is greater or equal to 5120. Otherwise the absolute value of t…'

2010-04-14T22:33:19Z

Created page with 'integer '''getDistanceInTiles'''(location ''A'', location ''B'');<br> This function will return 9999 if A.x or B.x is greater or equal to 5120. Otherwise the absolute value of t…'

New page

integer '''getDistanceInTiles'''(location ''A'', location ''B'');<br>

This function will return 9999 if A.x or B.x is greater or equal to 5120. Otherwise the absolute value of the difference between A and B is made for both x and y and the highest value of the two is returned. The Z value is ignored when calculating the difference.
Pseudo-code (using signed integers):<pre>
integer DistanceInTiles(location A, location B)
{
if(A.x >= 5120 || B.x >= 5120)
return 9999;

Xdiff = A.x - B.x;
ydiff = A.y - B.y;

if(xdiff < 0)
xdiff = -xdiff;
if(ydiff < 0)
ydiff = -ydiff;

if(A.x < 5120) // OSI-bug (?), A.x is always lower than 5120
{
if(5120 - xdiff > xdiff)
xdiff = 5120 - xdiff;
if(4096 - ydiff > ydiff)
ydiff = 4096 - ydiff;
}

if(xdiff > ydiff)
retval = xdiff;
else
retval = ydiff;

return retval;
}</pre>

Return to the [[Command List]].

@@ Line 5: / Line 5: @@
 integer getDistanceInTiles(location A, location B)
+{
-   // NOTE TO SELF: I should clear this up when I'm not so sleepy
+   // NOTE TO SELF: I should explain this better when I'm not so sleepy
-   tmpx = A.x >= 5120 ? 1 : 0;
+   Ax_is_invalid = A.x >= 5120 ? 1 : 0;
-   tmpy = B.x >= 5120 ? 1 : 0;
+   Bx_is_invalid = B.x >= 5120 ? 1 : 0;
-   if(tmpx ^ tmpy != 0)
+   if(Ax_is_invalid ^ Bx_is_invalid != 0) // Indeed, XOR is used here
      return 9999;

@@ Line 3: / Line 3: @@
 This function will calculate the absolute value of the difference between A and B (for both x and y) and the highest value of the two is returned. The Z value is ignored when calculating the difference.
 Pseudo-code (using signed integers):<pre>
-integer DistanceInTiles(location A, location B)
+integer getDistanceInTiles(location A, location B)
+{
    // NOTE TO SELF: I should clear this up when I'm not so sleepy

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