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f5adba2cb8
Before custom vector classes named Vector or vector could override hump vector class. This feature may result in confusing bugs, so it should better be removed.
92 lines
2.9 KiB
Lua
92 lines
2.9 KiB
Lua
--[[
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Copyright (c) 2010 Matthias Richter
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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Except as contained in this notice, the name(s) of the above copyright holders
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shall not be used in advertising or otherwise to promote the sale, use or
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other dealings in this Software without prior written authorization.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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]]--
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local _PATH = (...):match('^(.*[%./])[^%.%/]+$') or ''
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local vector = require(_PATH..'vector')
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local camera = {}
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camera.__index = camera
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local function new(pos, zoom, rot)
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local pos = pos or vector(love.graphics.getWidth(), love.graphics.getHeight()) / 2
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local zoom = zoom or 1
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local rot = rot or 0
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return setmetatable({pos = pos, zoom = zoom, rot = rot}, camera)
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end
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function camera:rotate(phi)
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self.rot = self.rot + phi
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return self
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end
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function camera:move(p,q)
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p = type(p) == "number" and vector(p,q) or p
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self.pos = self.pos + p
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return self
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end
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function camera:attach()
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local center = vector(love.graphics.getWidth(), love.graphics.getHeight()) / (self.zoom * 2)
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love.graphics.push()
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love.graphics.scale(self.zoom)
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love.graphics.translate(center:unpack())
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love.graphics.rotate(self.rot)
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love.graphics.translate((-self.pos):unpack())
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end
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function camera:detach()
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love.graphics.pop()
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end
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function camera:draw(func)
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self:attach()
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func()
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self:detach()
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end
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function camera:cameraCoords(p, q)
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p = type(p) == "number" and vector(p,q) or p
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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p = (p - self.pos):rotate_inplace(self.rot)
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return vector(p.x * self.zoom + w/2, p.y * self.zoom + h/2)
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end
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function camera:worldCoords(p, q)
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p = type(p) == "number" and vector(p,q) or p
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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p = vector((p.x-w/2) / self.zoom, (p.y-h/2) / self.zoom):rotate_inplace(-self.rot)
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return p + self.pos
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end
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function camera:mousepos()
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return self:worldCoords(vector(love.mouse.getPosition()))
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end
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-- the module
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return setmetatable({new = new},
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{__call = function(_, ...) return new(...) end})
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