From 9c3ef4ce65263bb5b6c667c4ad0a47631a7b23b5 Mon Sep 17 00:00:00 2001 From: Kazhnuz Date: Mon, 29 Apr 2019 08:44:10 +0200 Subject: [PATCH] modules/world: add initial basic camera system --- gamecore/modules/world/camera.lua | 97 +++++++++ gamecore/modules/world/libs/hump/camera.lua | 216 ++++++++++++++++++++ 2 files changed, 313 insertions(+) create mode 100644 gamecore/modules/world/camera.lua create mode 100644 gamecore/modules/world/libs/hump/camera.lua diff --git a/gamecore/modules/world/camera.lua b/gamecore/modules/world/camera.lua new file mode 100644 index 0000000..d70057c --- /dev/null +++ b/gamecore/modules/world/camera.lua @@ -0,0 +1,97 @@ +-- 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 diff --git a/gamecore/modules/world/libs/hump/camera.lua b/gamecore/modules/world/libs/hump/camera.lua new file mode 100644 index 0000000..cb86a79 --- /dev/null +++ b/gamecore/modules/world/libs/hump/camera.lua @@ -0,0 +1,216 @@ +--[[ +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})