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50 lines
2.2 KiB
CoffeeScript
50 lines
2.2 KiB
CoffeeScript
# http://codingowl.com/readblog.php?blogid=124
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module.exports.CollisionCategory = class CollisionCategory
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@className: 'CollisionCategory'
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constructor: (name, @superteamIndex=null, @collisionSystem) ->
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# @superteamIndex is null for 'none', 'obstacles', and 'dead'.
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# It's 0 for 'ground', 'air', and 'ground_and_air' units with no superteams.
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# It's 1, 2, or 3 for the superteams it gets after that. We can only have 16 collision categories.
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@ground = name.search('ground') isnt -1
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@air = name.search('air') isnt -1
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@name = CollisionCategory.nameFor name, @superteamIndex
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@superteamIndex ?= 0 if @ground or @air
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@number = 1 << @collisionSystem.totalCategories++
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if @collisionSystem.totalCategories > 16 then console.log 'There should only be 16 collision categories!'
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@mask = 0
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@collisionSystem.allCategories[@name] = @
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for otherCatName, otherCat of @collisionSystem.allCategories
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if @collidesWith otherCat
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@mask = @mask | otherCat.number
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otherCat.mask = otherCat.mask | @number
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collidesWith: (cat) ->
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# 'none' collides with nothing
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return false if @name is 'none' or cat.name is 'none'
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# 'obstacles' collides with everything; could also try letting air units (but not ground_and_air) fly over these
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return true if cat.name is 'obstacles' or @name is 'obstacles'
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# 'dead' collides only with obstacles
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return cat.name is 'obstacles' if @name is 'dead'
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return @name is 'obstacles' if cat.name is 'dead'
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# 'ground_and_air_<team>' units don't hit ground or air units on their team (so missiles don't hit same team)
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sameTeam = @superteamIndex and cat.superteamIndex is @superteamIndex
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return false if sameTeam and @ground and @air
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# actually, 'ground_and_air<team>' units don't hit any ground_and_air units (temp missile collision fix)
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return false if @ground and @air and cat.ground and cat.air
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# 'ground' collides with 'ground'
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return true if cat.ground and @ground
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# 'air' collides with 'air'
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return true if cat.air and @air
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# doesn't collide (probably 'ground' and 'air')
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false
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@nameFor: (name, superteamIndex=null) ->
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return name unless name.match('ground') or name.match('air')
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name + '_' + (superteamIndex or 0)
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