generated from sage/tiny-ecs-love-template
37 lines
1.0 KiB
Lua
37 lines
1.0 KiB
Lua
local world = require("world")
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local camera = {
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pan = {
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x = 0,
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y = 0,
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},
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}
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local expireBelowScreen =
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world:filteredSystem("expireBelowScreen", { position = T.XyPair, expireBelowScreenBy = T.number })
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local focusPriority = {}
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cameraPanSystem = world:filteredSystem("cameraPan", { focusPriority = T.number, position = T.XyPair }, function(e, _)
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if e.focusPriority >= focusPriority.priority then
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focusPriority.position = e.position
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end
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end)
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function cameraPanSystem.preProcess()
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focusPriority.priority = 0
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focusPriority.position = { x = 0, y = 0 }
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end
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function cameraPanSystem:postProcess()
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camera.pan.x = math.max(0, focusPriority.position.x - 200)
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camera.pan.y = math.min(0, focusPriority.position.y - 120)
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love.graphics.translate(0, -camera.pan.y)
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for _, entity in pairs(expireBelowScreen.entities) do
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if entity.position.y - (camera.pan.y + 240) > entity.expireBelowScreenBy then
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self.world:removeEntity(entity)
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end
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end
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end
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