Save and load a snapshot of a Box2D scene using JSON

SaveBox2DStateAsJson

--# Main
-- Json Test
supportedOrientations(LANDSCAPE_LEFT)
displayMode(OVERLAY)
-- Use this function to perform your initial setup
function setup()    
    parameter.action("Take snapshot", function() tabSave(objects, "Test") end)
    parameter.action("Load from snapshot", function() killBodies() loadBodies() end)
    AddToJson()  --establish metamethods for encoding vec2, vec3, vec4, matrix as json objects
    meshes={mesh(),mesh()}
    meshes[1].texture="Platformer Art:Coin"
    meshes[2].texture="Platformer Art:Block Grass"
    walls={}
    local corners = {vec2(0,0), vec2(WIDTH,0), vec2(WIDTH,HEIGHT), vec2(0,HEIGHT), vec2(0,0)}
    for i=1,#corners-1 do
        walls[i]=physics.body(EDGE, corners[i],corners[i+1])
    end
    
    --resetBodies()
    loadBodies()
end

function draw()
    physics.gravity(Gravity)
    for i,v in ipairs(objects) do
        v:update()
    end
    background(0)
    meshes[1]:draw()
    meshes[2]:draw()
end

function resetBodies()
    local rnd = math.random
    objects={}

    for i=1,15 do
        --circular bodies
        local x,y =rnd()*WIDTH*0.6+WIDTH*0.2, rnd()*HEIGHT*0.6+HEIGHT*0.2
        local r = rnd(20)+20
        objects[#objects+1]=Entity{
        body=physics.body(CIRCLE, r),
        bodyProperties={position=vec2(x,y), restitution=rnd()+0.5},
        rectProperties={meshId=1, width=r * 2, color=color(rnd(255), rnd(255), rnd(255))}
        }
        
        --square bodies
        local w,h = rnd(20)+20, rnd(20)+20
        x,y =rnd()*WIDTH*0.6+WIDTH*0.2, rnd()*HEIGHT*0.6+HEIGHT*0.2
        
        objects[#objects+1]=Entity{
        body=physics.body(POLYGON, vec2(-w,-h), vec2(-w,h), vec2(w,h), vec2(w,-h)),   
        bodyProperties={position=vec2(x,y), restitution=rnd(), },      
        rectProperties={meshId=2, width=w*2, height =h*2, color=color(rnd(255), rnd(255), rnd(255))}
        }
    end
    tabSave(objects, "Test") --save these objects
end

function killBodies()
    meshes[1]:clear()
    meshes[2]:clear()
    for i,v in ipairs(objects) do
        v.body:destroy()
    end
end

function loadBodies()
    local loadBack=tabLoad("Test")
    loadBack=tabIterate(loadBack) --decode json objects back to vec2, vec3, vec4
    objects={}
    for i,v in ipairs(loadBack) do
        local b=v.body.__rigidbody
        local body
        if b.radius then 
            body=physics.body(b.shapeType, b.radius) 
        else 
            body=physics.body(b.shapeType, table.unpack(b.points)) 
        end
        objects[i]=Entity{
        body=body,
        bodyProperties=v.body.__rigidbodyProperties,   
        rectProperties={meshId=v.meshId, width=v.width, height=v.height, color=v.color}
        }
    end
end

--# Json
--meta-methods
function AddToJson()
    local meta = getmetatable(vec2())
    meta.__tojson = function(t)
        return json.encode({__vec2={x=t.x,y=t.y}})
    end
    meta = getmetatable(vec3())
    meta.__tojson = function(t)
        return json.encode({__vec3={x=t.x,y=t.y,z=t.z}})
    end
    meta = getmetatable(vec4())
    meta.__tojson = function(t)
        return json.encode({__vec4={x=t.x,y=t.y,z=t.z,w=t.w}})
    end
    meta = getmetatable(matrix())
    meta.__tojson = function(t)
        return json.encode({__mat4={t[1],t[2],t[3],t[4], t[5],t[6],t[7],t[8], t[9],t[10],t[11],t[12], t[13],t[14],t[15],t[16]}}) --a matrix.unpack function would've been handy here!
    end
    meta = getmetatable(color())
    meta.__tojson = function(t)
        return json.encode({__color={r=t.r, g=t.g, b=t.b, a=t.a}})
    end
    meta = getmetatable(mesh())
    meta.__tojson = function(t)
        return json.encode({nil}) --({__mesh=t.id})
    end
    
    local dummy = physics.body(CIRCLE, 10)
    meta = getmetatable(dummy)
    dummy:destroy()

    meta.__tojson = function(t)
    return json.encode({
    __rigidbody={shapeType=t.shapeType, radius=t.radius, points=t.points},
    __rigidbodyProperties={type=t.type, position=t.position, angle=t.angle, linearVelocity=t.linearVelocity, angularVelocity=t.angularVelocity, restitution=t.restitution, friction=t.friction, linearDamping=t.linearDamping, angularDamping=t.angularDamping
    }})
       end 
    --add extra categories from below according to needs
    --gravityScale=t.gravityScale, info=t.info, density=t.density, sensor=t.sensor, categories=t.categories, mask=t.mask, fixedRotation=t.fixedRotation, active=t.active, awake=t.awake, sleepingAllowed=t.sleepingAllowed, interpolate=t.interpolate, joints=t.joints, bullet=t.bullet, 
    
end

function tabSave(tab, loc)
    local str=json.encode(tab, {indent = true, exception = jsonException})
    saveProjectTab(loc, "--["..str.."]\n")
end

function tabLoad(loc)
    local str=readProjectTab(loc)
    return json.decode(string.sub(str,4,-3))
end

local underscore = {"=","~","-","."} --underscore characters indicate table depth

function tabIterate(tab, verbose, i) --set verbose to true for print out (debugging)
    local new = {}
    local i = i or 0
    local indent = string.rep(" ", i*3) --depth of indentation
    for k,v in pairs(tab) do
        local report = indent..k
        if type(v)=="table" then --check first whether its a pseudo-table representing a vec2, vec3, vec4, mat4
            if v.__vec2 then --convert back to vec2
                local vec = v.__vec2
                new[k] = vec2(vec.x, vec.y)
            elseif v.__vec3 then --convert back to vec3
                local vec = v.__vec3
                new[k] = vec3(vec.x, vec.y, vec.z)
            elseif v.__vec4 then --convert back to vec4
                local vec = v.__vec4
                new[k] = vec4(vec.x, vec.y, vec.z, vec.w)
            elseif v.__color then --convert back to vec4
                local vec = v.__color
                new[k] = color(vec.r, vec.g, vec.b, vec.a)
            elseif v.__mat4 then --convert back to matrix
                new[k] = matrix(table.unpack(v.__mat4))
            else --genuine table
                if verbose then
                    local under = string.rep(underscore[math.min(#underscore, i+1)], string.len(k))
                    report = report.."\n"..indent..under
                    print(report)
                end
                new[k]=tabIterate(v, verbose, i+1) --increase indent upon recursion
            end          
        else
            new[k]=v
        end
        if verbose and type(new[k])~="table" then
            report = report..": "..tostring(new[k])            
            print(report)
        end
    end
    return new
end
--# Entity
Entity = class()

function Entity:init(t)
    if t.body then
        self.body = t.body
        self.body.interpolate = true
        for k,v in pairs(t.bodyProperties) do
            self.body[k]=v
        end
    end
    if t.rectProperties then
        for k,v in pairs(t.rectProperties) do
            self[k]=v
        end
        self.mesh = meshes[self.meshId]
        if not self.height then self.height=self.width end
        self.r = self.mesh:addRect(0,0, self.width, self.height)
        self.mesh:setRectColor(self.r, self.color)
    end
end

function Entity:update()
    self.mesh:setRect(self.r,self.body.x,self.body.y,self.width, self.height, math.rad(self.body.angle))
end

--# Test
--[[{
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    "width":56,
    "body":{"__rigidbody":{"radius":28.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-123.60840606689,"y":50.084274291992}},"angularVelocity":54.199081026425,"angle":-111.11995828615,"restitution":0.53865760564804,"position":{"__vec2":{"x":891.244140625,"y":65.013198852539}}}},
    "r":1,
    "mesh":[],
    "height":56,
    "meshId":1
  },{
    "color":{"__color":{"b":31.0,"a":255.0,"r":78.0,"g":159.0}},
    "width":78,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-39.0,"y":-40.0}},{"__vec2":{"x":-39.0,"y":40.0}},{"__vec2":{"x":39.0,"y":40.0}},{"__vec2":{"x":39.0,"y":-40.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-181.04208374023,"y":60.860694885254}},"angularVelocity":-117.16934072082,"angle":-294.336975564,"restitution":0.98746371269226,"position":{"__vec2":{"x":220.08139038086,"y":236.96911621094}}}},
    "r":1,
    "mesh":[],
    "height":80,
    "meshId":2
  },{
    "color":{"__color":{"b":157.0,"a":255.0,"r":162.0,"g":236.0}},
    "width":50,
    "body":{"__rigidbody":{"radius":25.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-106.57793426514,"y":211.66331481934}},"angularVelocity":393.29024274953,"angle":753.4569640247,"restitution":1.2879832983017,"position":{"__vec2":{"x":844.59521484375,"y":595.62585449219}}}},
    "r":2,
    "mesh":[],
    "height":50,
    "meshId":1
  },{
    "color":{"__color":{"b":90.0,"a":255.0,"r":4.0,"g":229.0}},
    "width":52,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-26.0,"y":-37.0}},{"__vec2":{"x":-26.0,"y":37.0}},{"__vec2":{"x":26.0,"y":37.0}},{"__vec2":{"x":26.0,"y":-37.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-117.25454711914,"y":-11.668020248413}},"angularVelocity":27.321036717807,"angle":-2.2482397947968,"restitution":0.073303528130054,"position":{"__vec2":{"x":950.36328125,"y":38.470054626465}}}},
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    "mesh":[],
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    "meshId":2
  },{
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  },{
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    "width":68,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-34.0,"y":-21.0}},{"__vec2":{"x":-34.0,"y":21.0}},{"__vec2":{"x":34.0,"y":21.0}},{"__vec2":{"x":34.0,"y":-21.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-134.68103027344,"y":15.991744041443}},"angularVelocity":34.847403164257,"angle":31.624400819468,"restitution":0.72237491607666,"position":{"__vec2":{"x":613.81604003906,"y":94.739562988281}}}},
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  },{
    "color":{"__color":{"b":68.0,"a":255.0,"r":233.0,"g":241.0}},
    "width":50,
    "body":{"__rigidbody":{"radius":25.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-148.81484985352,"y":45.380233764648}},"angularVelocity":39.119990433518,"angle":391.09635866736,"restitution":0.98836261034012,"position":{"__vec2":{"x":664.71948242188,"y":125.48670959473}}}},
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  },{
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    "width":76,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-38.0,"y":-27.0}},{"__vec2":{"x":-38.0,"y":27.0}},{"__vec2":{"x":38.0,"y":27.0}},{"__vec2":{"x":38.0,"y":-27.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-131.43852233887,"y":46.389877319336}},"angularVelocity":54.057375091715,"angle":45.509990986996,"restitution":0.55343943834305,"position":{"__vec2":{"x":848.31091308594,"y":296.7421875}}}},
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  },{
    "color":{"__color":{"b":24.0,"a":255.0,"r":185.0,"g":249.0}},
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    "height":68,
    "meshId":2
  },{
    "color":{"__color":{"b":239.0,"a":255.0,"r":48.0,"g":71.0}},
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    "body":{"__rigidbody":{"radius":23.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-42.670429229736,"y":-12.567100524902}},"angularVelocity":-63.234977336056,"angle":-60559611133.099,"restitution":0.54409992694855,"position":{"__vec2":{"x":908.58728027344,"y":206.16510009766}}}},
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    "meshId":1
  },{
    "color":{"__color":{"b":124.0,"a":255.0,"r":231.0,"g":164.0}},
    "width":60,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-30.0,"y":-33.0}},{"__vec2":{"x":-30.0,"y":33.0}},{"__vec2":{"x":30.0,"y":33.0}},{"__vec2":{"x":30.0,"y":-33.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-213.52442932129,"y":187.59973144531}},"angularVelocity":-132.2114253488,"angle":-98.913187635481,"restitution":0.30837768316269,"position":{"__vec2":{"x":763.95880126953,"y":492.74505615234}}}},
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    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-38.0,"y":-36.0}},{"__vec2":{"x":-38.0,"y":36.0}},{"__vec2":{"x":38.0,"y":36.0}},{"__vec2":{"x":38.0,"y":-36.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-156.5302734375,"y":31.297170639038}},"angularVelocity":-6.5132030788402,"angle":34.254156838612,"restitution":0.020476881414652,"position":{"__vec2":{"x":768.10919189453,"y":51.674556732178}}}},
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    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-24.0,"y":-22.0}},{"__vec2":{"x":-24.0,"y":22.0}},{"__vec2":{"x":24.0,"y":22.0}},{"__vec2":{"x":24.0,"y":-22.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-11.814755439758,"y":56.638793945312}},"angularVelocity":-162.06137375775,"angle":89.901859516294,"restitution":0.64327186346054,"position":{"__vec2":{"x":41.21203994751,"y":258.74853515625}}}},
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    "body":{"__rigidbody":{"radius":25.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-106.67462921143,"y":114.15914154053}},"angularVelocity":82.9881576233,"angle":-261.31948594632,"restitution":0.7956166267395,"position":{"__vec2":{"x":739.06384277344,"y":181.02383422852}}}},
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    "mesh":[],
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    "meshId":1
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    "color":{"__color":{"b":148.0,"a":255.0,"r":211.0,"g":75.0}},
    "width":76,
    "body":{"__rigidbody":{"shapeType":2.0,"points":[{"__vec2":{"x":-38.0,"y":-40.0}},{"__vec2":{"x":-38.0,"y":40.0}},{"__vec2":{"x":38.0,"y":40.0}},{"__vec2":{"x":38.0,"y":-40.0}}]},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":53.928527832031,"y":228.02954101562}},"angularVelocity":326.95776779468,"angle":192.71982531914,"restitution":0.92627036571503,"position":{"__vec2":{"x":51.547519683838,"y":477.72268676758}}}},
    "r":10,
    "mesh":[],
    "height":80,
    "meshId":2
  },{
    "color":{"__color":{"b":174.0,"a":255.0,"r":188.0,"g":14.0}},
    "width":56,
    "body":{"__rigidbody":{"radius":28.0,"shapeType":0.0},"__rigidbodyProperties":{"linearDamping":0.0,"angularDamping":0.0,"type":2,"friction":0.20000000298023,"linearVelocity":{"__vec2":{"x":-77.450538635254,"y":13.783011436462}},"angularVelocity":5.765506966154,"angle":-96.576368184555,"restitution":1.3774162530899,"position":{"__vec2":{"x":901.56304931641,"y":144.84625244141}}}},
    "r":11,
    "mesh":[],
    "height":56,
    "meshId":1
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