this._element.__controller = this;

    this._renderer.node_layer.activate();

    this.type = "node";

    this.node_circle.fillColor = '#ffffff';

    this.node_circle.__controller = this;

    this.node_text = new paper.PointText([0,0]);

    this.node_text.characterStyle = {

        fontSize: 14,

        fillColor: 'black'

    };

    this.node_text.paragraphStyle.justification = 'center';

    this.node_text.__controller = this;

    this.node_model_coords = new paper.Point(this._element.position.x, this._element.position.y);

    this.node_paper_coords = this._renderer.toPaperCoords(this.node_model_coords);

    this.node_circle.position = this.node_paper_coords;

    this.node_text.content = this._element.title;

    this.node_text.position = this.node_paper_coords.add([0, 35]);

Rkns.Renderers.Paper__Controllers.Node.prototype.paperShift = function(_delta) {

    this.node_paper_coords = this.node_paper_coords.add(_delta);

    this.node_model_coords = this._renderer.toModelCoords(this.node_paper_coords);

    this._element.position.x = this.node_model_coords.x;

    this._element.position.y = this.node_model_coords.y;

    this._renderer.redraw();

}

/* */

Rkns.Renderers.Paper__Controllers.Edge = Rkns.Utils.inherit(Rkns.Renderers.Paper__Controllers._Base);

Rkns.Renderers.Paper__Controllers.Edge.prototype._init = function() {

    this._renderer.edge_layer.activate();

    this.type = "edge";

    this.from_node_controller = this._element.from.__controller;

    this.to_node_controller = this._element.to.__controller;

    this.edge_line = new paper.Path();

    this.edge_line.add([0,0],[0,0]);

    this.edge_line.__controller = this;

    this.edge_text = new paper.PointText();

    this.edge_text.characterStyle = {

        fontSize: 10,

        fillColor: 'black'

    };

    this.edge_text.paragraphStyle.justification = 'center';

    this.edge_text.__controller = this;

    this.edge_angle = 0;

}

Rkns.Renderers.Paper__Controllers.Edge.prototype.redraw = function() {

    this.edge_line.strokeColor = this._element.created_by.color;

    var _p0 = this.from_node_controller.node_paper_coords,

        _p1 = this.to_node_controller.node_paper_coords,

        _a = _p1.subtract(_p0).angle;

    this.edge_line.segments[0].point = _p0;

    this.edge_line.segments[1].point = _p1;

    this.edge_text.content = this._element.title;

    this.edge_text.position = _p0.add(_p1).divide(2);

    if (_a > 90) {

        _a -= 180;

    }

    if (_a < -90) {

        _a += 180;

    }

    this.edge_text.rotate(_a - this.edge_angle);

    this.edge_angle = _a;

}

Rkns.Renderers.Paper__Controllers.Edge.prototype.paperShift = function(_delta) {

    this.from_node_controller.paperShift(_delta);

    this.to_node_controller.paperShift(_delta);

    this._renderer.redraw();

}

/* */

    this.scale = 1;

    this.offset = paper.view.center;

    this.totalScroll = 0;

    this.dragging_target = null;

    this.edge_layer = new paper.Layer();

    this.node_layer = new paper.Layer();

    var _tool = new paper.Tool(),

        _this = this;

    _tool.onMouseDown = function(_event) {

        _this.onMouseDown(_event);

    }

    _tool.onMouseDrag = function(_event) {

        _this.onMouseDrag(_event);

    }

    Rkns.$("#"+this._project._opts.canvas_id).mousewheel(function(_event, _delta) {

        _this.onScroll(_event, _delta);

    })

    paper.view.onResize = function(_event) {

        _this.offset = _this.offset.add(_event.delta.divide(2));

        _this.redraw();

    }

}

Rkns.Renderers.Paper.prototype.toPaperCoords = function(_point) {

    return _point.multiply(this.scale).add(this.offset);

}

Rkns.Renderers.Paper.prototype.toModelCoords = function(_point) {

    return _point.subtract(this.offset).divide(this.scale);

    var _this = this,

        _xx = this._project.nodes.map(function(_node) { return _node.position.x }),

        _yy = this._project.nodes.map(function(_node) { return _node.position.y }),

        _minx = Math.min.apply(Math, _xx),

        _miny = Math.min.apply(Math, _yy),

        _maxx = Math.max.apply(Math, _xx),

        _maxy = Math.max.apply(Math, _yy);

    this.scale = Math.min((paper.view.size.width - 100) / (_maxx - _minx), (paper.view.size.height - 100) / (_maxy - _miny));

    this.offset = paper.view.center.subtract(new paper.Point([(_maxx + _minx) / 2, (_maxy + _miny) / 2]).multiply(this.scale));

    this.edges = this._project.edges.map(function(_edge) {

        return new Rkns.Renderers.Paper__Controllers.Edge(_this, _edge);

    });

    this.redraw();

    });

    Rkns._(this.edges).each(function(_edge) {

        _edge.redraw();

    });

    paper.view.draw();

}

Rkns.Renderers.Paper.prototype.onMouseDown = function(_event) {

    var _hitResult = paper.project.hitTest(_event.point);

    if (_hitResult && typeof _hitResult.item.__controller !== "undefined") {

        this.dragging_target = _hitResult.item.__controller;

    } else {

        this.dragging_target = null;

    }

Rkns.Renderers.Paper.prototype.onMouseDrag = function(_event) {

    if (this.dragging_target && typeof this.dragging_target.paperShift === "function") {

        this.dragging_target.paperShift(_event.delta);

    } else {

        this.offset = this.offset.add(_event.delta);

        this.redraw();

    }

}

Rkns.Renderers.Paper.prototype.onScroll = function(_event, _delta) {

    this.totalScroll += _delta;

    if (Math.abs(this.totalScroll) >= 1) {

        if (this.totalScroll > 0) {

            this.scale *= Math.SQRT2;

        } else {

            this.scale *= Math.SQRT1_2;

        }

        console.log(this.scale);

        this.totalScroll = 0;

        this.redraw();

    }

}