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48 lines
2.1 KiB
CoffeeScript
48 lines
2.1 KiB
CoffeeScript
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# 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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# "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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