URL:
<http://gna.org/bugs/?17968>
Summary: Vision shape inconsistency
Project: Freeciv
Submitted by: alocritani
Submitted on: mer 30 mar 2011 11:19:09 GMT
Category: rulesets
Severity: 2 - Minor
Priority: 5 - Normal
Status: None
Assigned to: None
Originator Email:
Open/Closed: Open
Release:
Discussion Lock: Any
Operating System: GNU/Linux
Planned Release:
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Details:
Units like destroyers have vision_radius_sq = 8, ie: a 5x5 square
units like land units have vision_radius_sq = 2, ie: a 3x3 square
but the bonus for watchtower adds 8
; Vision benefit from fortress watchtowers
[effect_fortress_vision]
name = "Unit_Vision_Radius_Sq"
value = 8
reqs =
{ "type", "name", "range"
"Base", "Fortress", "tile"
"Tech", "Invention", "player"
}
bringing the total to 10, ie: a diamond-shape vision range.
I thing we should use the same shape (diamond or square) vision range for
every units/bonus.
if it can be useful for better understanding the differences, this is a very
useful comment from comment\city.h
/* The city's valid positions are in a circle around the city center.
* Depending on the value for the squared city radius the circle will be:
*
* - rectangular (max radius = 5; max squared radius = 26)
*
* 0 1 2 3 4 5 6 7 8 9 10
*
* 0 26 25 26 -5
* 1 25 20 17 16 17 20 25 -4
* 2 25 18 13 10 9 10 13 18 25 -3
* 3 20 13 8 5 4 5 8 13 20 -2
* 4 26 17 10 5 2 1 2 5 10 17 26 -1
* 5 25 16 9 4 1 0 1 4 9 16 25 +0
* 6 26 17 10 5 2 1 2 5 10 17 26 +1
* 7 20 13 8 5 4 5 8 13 20 +2
* 8 25 18 13 10 9 10 13 18 25 +3
* 9 25 20 17 16 17 20 25 +4
* 10 26 25 26 +5
*
* -5 -4 -3 -2 -1 +0 +1 +2 +3 +4 +5
*
* - hexagonal (max radius = 5; max squared radius = 26)
*
* 0 1 2 3 4 5 6 7 8 9 10
*
* 0 25 25 25 25 25 25 -5
* 1 25 16 16 16 16 16 25 -4
* 2 25 16 9 9 9 9 16 25 -3
* 3 25 16 9 4 4 4 9 16 25 -2
* 4 25 16 9 4 1 1 4 9 16 25 -1
* 5 25 16 9 4 1 0 1 4 9 16 25 +0
* 6 25 16 9 4 1 1 4 9 16 25 +1
* 7 25 16 9 4 4 4 9 16 25 +2
* 8 25 16 9 9 9 9 16 25 +3
* 9 25 16 16 16 16 16 25 +4
* 10 25 25 25 25 25 25 +5
*
* -5 -4 -3 -2 -1 +0 +1 +2 +3 +4 +5
*
* The following tabes show the tiles per city radii / squared city radii.
* '-' indicates no change compared to the previous value
*
* radius | 0 | 1 | | | 2 | | | | | 3
* radius_sq | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10
* ------------------+----+----+----+----+----+----+----+----+----+----
* tiles rectangular | 5 | 9 | - | 13 | 21 | - | - | 25 | 29 | 37
* tiles hexagonal | 7 | - | - | 19 | - | - | - | - | 37 | -
*
* radius | | | | | | | 4 | | |
* radius_sq | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20
* ------------------+----+----+----+----+----+----+----+----+----+----
* tiles rectangular | - | - | 45 | - | - | - | 49 | 57 | 61 | 69
* tiles hexagonal | - | - | - | - | - | 61 | - | - | - | -
*
* radius | | | | | | 5
* radius_sq | 21 | 22 | 23 | 24 | 25 | 26
* ------------------+----+----+----+----+----+----
* tiles rectangular | - | - | - | - | 81 | 89
* tiles hexagonal | - | - | - | - | 91 | -
*
* So radius_sq == 5 (radius == 2) corresponds to the "traditional"
* used city map.
*/
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