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hump.camera is not independent of hump.vector-light. camera:pos() returns the camera position. camera:rotation() returns the camera rotation.
102 lines
3.1 KiB
Lua
102 lines
3.1 KiB
Lua
--[[
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Copyright (c) 2010-2012 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 cos, sin = math.cos, math.sin
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local camera = {}
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camera.__index = camera
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local function new(x,y, zoom, rot)
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x,y = x or love.graphics.getWidth()/2, y or love.graphics.getHeight()/2
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zoom = zoom or 1
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rot = rot or 0
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return setmetatable({x = x, y = y, 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:rotation()
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return self.rot
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end
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function camera:move(x,y)
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self.x, self.y = self.x + x, self.y + y
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return self
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end
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function camera:pos()
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return self.x, self.y
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end
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function camera:attach()
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local cx,cy = love.graphics.getWidth()/(2*self.zoom), love.graphics.getHeight()/(2*self.zoom)
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love.graphics.push()
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love.graphics.scale(self.zoom)
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love.graphics.translate(cx, cy)
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love.graphics.rotate(self.rot)
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love.graphics.translate(-self.x, -self.y)
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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(x,y)
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-- x,y = ((x,y) - (self.x, self.y)):rotated(self.rot) * self.zoom + center
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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local c,s = cos(self.rot), sin(self.rot)
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x,y = x - self.x, y - self.y
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x,y = c*x - s*y, s*x + c*y
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return x*self.zoom + w/2, y*self.zoom + h/2
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end
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function camera:worldCoords(x,y)
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-- x,y = (((x,y) - center) / self.zoom):rotated(-self.rot) + (self.x,self.y)
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local w,h = love.graphics.getWidth(), love.graphics.getHeight()
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local c,s = cos(-self.rot), sin(-self.rot)
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x,y = (x - w/2) / self.zoom, (y - h/2) / self.zoom
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x,y = c*x - s*y, s*x + c*y
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return x+self.x, y+self.y
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end
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function camera:mousepos()
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return self:worldCoords(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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