# A-Frame & VWF simple scene
# Copyright 2017 Krestianstvo.org project
---
extends: http://vwf.example.com/aframe/ascene.vwf
properties:
    assets: "assets.json"
children:
    sky:
        extends: http://vwf.example.com/aframe/asky.vwf
        properties:
            color: "#ECECEC"
    groundPlane:
        extends: http://vwf.example.com/aframe/aplane.vwf
        properties:
            height: 50
            width: 50
            repeat: "10 10"
            rotation: [-90, 0, 0]
            wireframe: false
            src: "#bg2"
    turtle:
        extends: http://vwf.example.com/aframe/asphere.vwf
        properties:
            position: [1, 1.25, -4]
            color: "#e0e014"
            radius: 0.3
            wireframe: true
            angleInRadians: 0
            counter: 1
            iteration:
                set: |
                    this.iteration = value;
                    this.makeLSys();
                value: 3
            angle:
                set: |
                    this.angle = value;
                    this.makeLSys();
                value: 60  
            stepLength: 
                set: |
                    this.stepLength = value;
                    this.makeLSys();
                value: 0.5  
            rule: 
                set: |
                    this.rule = value;
                    this.makeLSys();
                value: 'F++F++F'
            axiomF: 
                set: |
                    this.axiomF = value;
                    this.makeLSys();
                value: 'F-F++F-F'
            axiomG:
                set: |
                    this.axiomG = value;
                    this.makeLSys();
                value: ''
            lsys: ''
            ready: false
        children:
            drawNode:
                extends: http://vwf.example.com/aframe/aentity.vwf
            lsysLang:
                extends: http://vwf.example.com/ohm/node.vwf
                properties:
                    grammar:
                    semantics:
                    ohmLang: |
                        LSys { Gen<x> 
                                = ReadRule+ 
                                ReadRule 
                                = letters | symbols
                                letters  = "F" | "G" 
                                symbols  = "-" | "+" }
                methods:
                    initLang:
                        body: |
                            console.log("add operations to semantics")
                            this.addOperationLang();
                    addOperationLang:
                        body: |
                            this.semantics.addOperation('gen(x)', {
                                Gen: function(e)
                                {
                                    return e.gen(this.args.x);
                                },
                                ReadRule: function(e)
                                {
                                    return e.gen(this.args.x);
                                },
                                letters: function(_)
                                {
                                    for (var propName in this.args.x)
                                    {
                                        if (propName == this.sourceString)
                                            return this.args.x[propName]
                                    }
                                    return this.sourceString
                                },
                                symbols: function(_)
                                {
                                    return this.sourceString;
                                }
                            });
            turtleLang:
                extends: http://vwf.example.com/ohm/node.vwf
                properties:
                    grammar:
                    semantics:
                    ohmLang: |
                        Turtle {
                        Draw<x, y> 
                            = (drawLetter | turn)+ 
                        drawLetter 
                            = letter
                        turn 
                            = "+" | "-" }
                methods:
                    initLang:
                        body: |
                            console.log("add operations to semantics")
                            this.addOperationLang();
                    addOperationLang:
                        body: |
                            var turtleID = this.parent.id;
                            var self = this;
                            this.semantics.addOperation('draw(x,y)', {
                                Draw: function(e)
                                {
                                    e.draw(this.args.x, this.args.y);
                                },
                                drawLetter: function(e)
                                {
                                    //vwf_view.kernel.callMethod(turtleID, 'goForward', [this.args.x]);
                                    self.parent.goForward(this.args.x);
                                },
                                turn: function(e)
                                {
                                    if (this.sourceString == "+")
                                        //vwf_view.kernel.callMethod(turtleID, 'turn', [this.args.y]);
                                        self.parent.turn(this.args.y);
                                    if (this.sourceString == "-")
                                        // vwf_view.kernel.callMethod(turtleID, 'turn', [-1 * this.args.y]);
                                        self.parent.turn(-1*this.args.y);
                                    }
                            });  
        methods:
            clearDraw: |
                let self = this
                let drawDef = {
                    "extends": "http://vwf.example.com/aframe/aentity.vwf",
                }
                this.children.delete(this.drawNode);
                this.children.create("drawNode", drawDef);
                this.angleInRadians = 0
                //this.drawNode.children.forEach(el => {
                //   self.drawNode.children.delete(el)
                //})
            parseLSys: |
                var str = this.rule;
                var axioms = {"F": this.axiomF, "G": this.axiomG};
                for (var i = 1; i < this.iteration; i++)
                {
                    var match = this.lsysLang.grammar.match(str, 'Gen<"y">');
                    if (match.succeeded()){
                    var res = this.lsysLang.semantics(match).gen(axioms);
                    str = res.join("");
                    }
                }
                console.log(str);
                this.lsys = str;
            makeLSys: |
                if (this.ready) 
                {
                //this.clearDraw();
                this.parseLSys();
                this.future(0.1).drawLSys();
                }
            drawLSys: |
                var match = this.turtleLang.grammar.match(this.lsys, 'Draw<"1","1">');
                if (match.succeeded()){
                    var res = this.turtleLang.semantics(match).draw(this.stepLength, this.angle);
                }
            makeMe:
                parameters:
                        - childName
                        - startPosition
                        - endPosition
                body: |
                        //let nodeId = this.drawNode.id;
                        var childComponent = {
                                            "extends": "http://vwf.example.com/aframe/lineComponent.vwf",
                                            "type": "component",
                                            "properties": {
                                                "start": startPosition,
                                                "end": endPosition,
                                                "color": "green"
                                            }
                                        }
                            //vwf_view.kernel.createChild(this.id, childName, childComponent);
                            this.drawNode.children.create(childName, childComponent);
            turn:
                parameters:
                    - angle
                body: |
                    var angle0 = this.angleInRadians;
                    var targetAngle = angle * Math.PI / 180.0;
                    this.angleInRadians = angle0 + targetAngle;
            goForward:
                parameters:
                    - step
                body: |
                    let pos = AFRAME.utils.coordinates.parse(this.drawNode.position);
                    var x0 = pos.x;
                    var y0 = pos.y;
                    var xx = Math.sin(this.angleInRadians);
                    var yy = Math.cos(this.angleInRadians);
                    let endPosition = AFRAME.utils.coordinates.stringify({x: x0 + step * xx, y: y0 + step * yy, z: pos.z});
                    this.counter = this.counter + 1;
                    this.makeMe('line__' + this.counter, this.drawNode.position, endPosition);
                    this.drawNode.position = endPosition;
            initialize:
                body: |
                   // vwf_view.kernel.createProperty(this.id, "angle", function() { return 90 })
                    this.ready = true;
                    //this.makeLSys();
                    console.log("initialising turtle");
                    //vwf_view.kernel.callMethod(this.id, "testDrawLsys");
methods:
  initialize:
    body: |
        //this.turtle.ready = true;
        console.log("initialising scene");
        //vwf_view.kernel.callMethod(this.id, "testDrawLsys");
  drawLSys1: |
    this.turtle.makeLSys()
  createNewTurtle: |
        console.log("create new turtle");
        let newTurtle = vwf.getNode(this.turtle.id, true);
        let randomName = "turtle-" + this.random();
        this.children.create(randomName, newTurtle);
  testTurtle: |
    this.turtle.goForward(1);
    this.turtle.goForward(1);
    this.turtle.turn(45);
    this.turtle.goForward(1);
    this.turtle.goForward(1);
    this.turtle.turn(45);
    this.turtle.goForward(1);