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modules/world: add initial basic camera system

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Kazhnuz 2019-04-29 08:44:10 +02:00
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gamecore/modules/world/camera.lua Normal file
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-- camera.lua :: a basic camera adapted to the asset/world system.
-- Use hump.camera as the view backend.
--[[
Copyright © 2019 Kazhnuz
Permission is hereby granted, free of charge, to any person obtaining a copy of
this software and associated documentation files (the "Software"), to deal in
the Software without restriction, including without limitation the rights to
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
the Software, and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]
local cwd = (...):gsub('%.camera$', '') .. "."
local CameraSystem = Object:extend()
local View = require(cwd .. "libs.hump.camera")
local SPLITSCREEN_ISVERTICAL = false
-- INIT FUNCTIONS
-- Initialize the camera system
function CameraSystem:new(world)
self.scene = world.scene
self.world = world
self.verticalSplit = SPLITSCREEN_ISVERTICAL
self:initViews()
end
function CameraSystem:initViews()
self.views = {}
self.views.list = {}
self.views.width, self.views.height = core.screen:getDimensions()
end
-- INFO FUNCTIONS
-- Get informations from the camera system
function CameraSystem:getViewNumber()
return #self.views.list
end
function CameraSystem:haveView()
return (self:getViewNumber() == 0)
end
-- WRAPPER and UTILS
-- Access data from the views
function CameraSystem:addView(x, y)
local view = {}
view.cam = View(x, y, 1, 0, true)
-- TODO: add a target system in order to make a camera able
-- to target a specific object
table.insert(self.views.list, view)
end
function CameraSystem:getView(id)
return self.views.list[id]
end
function CameraSystem:getViewCam(id)
local view = self:getView(id)
return view.cam
end
function CameraSystem:attachView(id)
local cam = self:getViewCam(id)
cam:attach()
end
function CameraSystem:detachView(id)
local cam = self:getViewCam(id)
cam:detach()
end
return CameraSystem

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gamecore/modules/world/libs/hump/camera.lua Normal file
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--[[
Copyright (c) 2010-2015 Matthias Richter
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
Except as contained in this notice, the name(s) of the above copyright holders
shall not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
]]--
local _PATH = (...):match('^(.*[%./])[^%.%/]+$') or ''
local cos, sin = math.cos, math.sin
local camera = {}
camera.__index = camera
-- Movement interpolators (for camera locking/windowing)
camera.smooth = {}
function camera.smooth.none()
return function(dx,dy) return dx,dy end
end
function camera.smooth.linear(speed)
assert(type(speed) == "number", "Invalid parameter: speed = "..tostring(speed))
return function(dx,dy, s)
-- normalize direction
local d = math.sqrt(dx*dx+dy*dy)
local dts = math.min((s or speed) * love.timer.getDelta(), d) -- prevent overshooting the goal
if d > 0 then
dx,dy = dx/d, dy/d
end
return dx*dts, dy*dts
end
end
function camera.smooth.damped(stiffness)
assert(type(stiffness) == "number", "Invalid parameter: stiffness = "..tostring(stiffness))
return function(dx,dy, s)
local dts = love.timer.getDelta() * (s or stiffness)
return dx*dts, dy*dts
end
end
local function new(x,y, zoom, rot, smoother)
x,y = x or love.graphics.getWidth()/2, y or love.graphics.getHeight()/2
zoom = zoom or 1
rot = rot or 0
smoother = smoother or camera.smooth.none() -- for locking, see below
return setmetatable({x = x, y = y, scale = zoom, rot = rot, smoother = smoother}, camera)
end
function camera:lookAt(x,y)
self.x, self.y = x, y
return self
end
function camera:move(dx,dy)
self.x, self.y = self.x + dx, self.y + dy
return self
end
function camera:position()
return self.x, self.y
end
function camera:rotate(phi)
self.rot = self.rot + phi
return self
end
function camera:rotateTo(phi)
self.rot = phi
return self
end
function camera:zoom(mul)
self.scale = self.scale * mul
return self
end
function camera:zoomTo(zoom)
self.scale = zoom
return self
end
function camera:attach(x,y,w,h, noclip)
x,y = x or 0, y or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
self._sx,self._sy,self._sw,self._sh = love.graphics.getScissor()
if not noclip then
love.graphics.setScissor(x,y,w,h)
end
local cx,cy = x+w/2, y+h/2
love.graphics.push()
love.graphics.translate(cx, cy)
love.graphics.scale(self.scale)
love.graphics.rotate(self.rot)
love.graphics.translate(-self.x, -self.y)
end
function camera:detach()
love.graphics.pop()
love.graphics.setScissor(self._sx,self._sy,self._sw,self._sh)
end
function camera:draw(...)
local x,y,w,h,noclip,func
local nargs = select("#", ...)
if nargs == 1 then
func = ...
elseif nargs == 5 then
x,y,w,h,func = ...
elseif nargs == 6 then
x,y,w,h,noclip,func = ...
else
error("Invalid arguments to camera:draw()")
end
self:attach(x,y,w,h,noclip)
func()
self:detach()
end
-- world coordinates to camera coordinates
function camera:cameraCoords(x,y, ox,oy,w,h)
ox, oy = ox or 0, oy or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
-- x,y = ((x,y) - (self.x, self.y)):rotated(self.rot) * self.scale + center
local c,s = cos(self.rot), sin(self.rot)
x,y = x - self.x, y - self.y
x,y = c*x - s*y, s*x + c*y
return x*self.scale + w/2 + ox, y*self.scale + h/2 + oy
end
-- camera coordinates to world coordinates
function camera:worldCoords(x,y, ox,oy,w,h)
ox, oy = ox or 0, oy or 0
w,h = w or love.graphics.getWidth(), h or love.graphics.getHeight()
-- x,y = (((x,y) - center) / self.scale):rotated(-self.rot) + (self.x,self.y)
local c,s = cos(-self.rot), sin(-self.rot)
x,y = (x - w/2 - ox) / self.scale, (y - h/2 - oy) / self.scale
x,y = c*x - s*y, s*x + c*y
return x+self.x, y+self.y
end
function camera:mousePosition(ox,oy,w,h)
local mx,my = love.mouse.getPosition()
return self:worldCoords(mx,my, ox,oy,w,h)
end
-- camera scrolling utilities
function camera:lockX(x, smoother, ...)
local dx, dy = (smoother or self.smoother)(x - self.x, self.y, ...)
self.x = self.x + dx
return self
end
function camera:lockY(y, smoother, ...)
local dx, dy = (smoother or self.smoother)(self.x, y - self.y, ...)
self.y = self.y + dy
return self
end
function camera:lockPosition(x,y, smoother, ...)
return self:move((smoother or self.smoother)(x - self.x, y - self.y, ...))
end
function camera:lockWindow(x, y, x_min, x_max, y_min, y_max, smoother, ...)
-- figure out displacement in camera coordinates
x,y = self:cameraCoords(x,y)
local dx, dy = 0,0
if x < x_min then
dx = x - x_min
elseif x > x_max then
dx = x - x_max
end
if y < y_min then
dy = y - y_min
elseif y > y_max then
dy = y - y_max
end
-- transform displacement to movement in world coordinates
local c,s = cos(-self.rot), sin(-self.rot)
dx,dy = (c*dx - s*dy) / self.scale, (s*dx + c*dy) / self.scale
-- move
self:move((smoother or self.smoother)(dx,dy,...))
end
-- the module
return setmetatable({new = new, smooth = camera.smooth},
{__call = function(_, ...) return new(...) end})