Difference between revisions of "GetDistanceInTiles"
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m (Protected "GetDistanceInTiles" ([edit=sysop] (indefinite) [move=sysop] (indefinite))) |
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integer getDistanceInTiles(location A, location B) | integer getDistanceInTiles(location A, location B) | ||
{ | { | ||
| − | // NOTE TO SELF: I should | + | // NOTE TO SELF: I should explain this better when I'm not so sleepy |
| − | + | Ax_is_invalid = A.x >= 5120 ? 1 : 0; | |
| − | + | Bx_is_invalid = B.x >= 5120 ? 1 : 0; | |
| − | if( | + | if(Ax_is_invalid ^ Bx_is_invalid != 0) // Indeed, XOR is used here |
return 9999; | return 9999; | ||
Latest revision as of 22:44, 14 April 2010
integer getDistanceInTiles(location A, location B);
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):
integer getDistanceInTiles(location A, location B)
{
// NOTE TO SELF: I should explain this better when I'm not so sleepy
Ax_is_invalid = A.x >= 5120 ? 1 : 0;
Bx_is_invalid = B.x >= 5120 ? 1 : 0;
if(Ax_is_invalid ^ Bx_is_invalid != 0) // Indeed, XOR is used here
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)
{
if(5120 - xdiff > xdiff)
xdiff = 5120 - xdiff;
if(4096 - ydiff > ydiff)
ydiff = 4096 - ydiff;
}
if(xdiff > ydiff)
retval = xdiff;
else
retval = ydiff;
return retval;
}
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