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https://github.com/vrld/hump.git
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87 lines
2.8 KiB
Lua
87 lines
2.8 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 = vector or Vector or 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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end
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function camera:translate(t)
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self.pos = self.pos + t
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end
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camera.move = camera.translate
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function camera:predraw()
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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:postdraw()
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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:predraw()
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func()
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self:postdraw()
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end
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function camera:toCameraCoords(p)
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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local 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:toWorldCoords(p)
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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local 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:toWorldCoords(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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