0005853: Bridge Support logic incorrect for left corners

ID	Project	Category	View Status	Date Submitted	Last Update

0005853	Dwarf Fortress	Dwarf Mode -- Buildings, General	public	2012-04-30 10:17	2012-04-30 10:21

Reporter	Quietust	Assigned To
Priority	normal	Severity	minor	Reproducibility	have not tried
Status	new	Resolution	open
Product Version	0.34.07

Summary	0005853: Bridge Support logic incorrect for left corners
Description	If a retracting bridge is not supported by a floor tile at any of its edges, it will deconstruct as soon as it realizes something is wrong (e.g. when digging nearby or trying to retract it). However, the logic for ignoring the corner tiles is broken - the upper-left and lower-left corners provide support, but the 3rd-from-left tiles along the top and bottom do not provide support. Intended "support" tiles for a 5x5 bridge ("B" = bridge, "+" = good, "x" = bad): `x+++++x +BBBBB+ +BBBBB+ +BBBBB+ +BBBBB+ +BBBBB+ x+++++x` Actual "support" tiles for a 5x5 bridge ("B" = bridge, "+" = good, "x" = bad): `++x+++x +BBBBB+ +BBBBB+ +BBBBB+ +BBBBB+ +BBBBB+ ++x+++x`
Additional Information	This was originally discovered by angavrilov while examining parts of the code for constructing buildings (in order to figure out how to construct buildings within DFHack) - apparently, the code is using "x+1" instead of "x-1" for the upper-left and lower-left tiles.
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Note

Date Modified	Username	Field	Change
2012-04-30 10:17	Quietust	New Issue
2012-04-30 10:21	Quietust	Note Added: 0022403
2016-07-31 07:22	Loci	Relationship added	related to 0009946

Quietust 2012-04-30 10:21 reporter ~0022403	I have a save file which individually tests every possible support tile for a 5x5 bridge - 24 bridges were built and linked to single lever (in case digging out their support tiles didn't trigger a collapse), and all appropriate tiles were designated for channeling. If necessary, I will post it on DFFD.