metamaps--metamaps/app/assets/javascripts/Jit/graphsettings.js

/*
 * @file
 * This function defines all settings and event callbacks for the JIT graph. Some are found in other files
 * First is the common settings (the same as arranged or chaotic)
 * Then if it's a centred graph additional settings are added.
 */

function graphSettings(type, embed) {
    var t = {
        //id of the visualization container
        injectInto: 'infovis',
        //Enable zooming and panning
        //by scrolling and DnD
        Navigation: {
            enable: true,
            //Enable panning events only if we're dragging the empty
            //canvas (and not a node).
            panning: 'avoid nodes',
            zooming: 28 //zoom speed. higher is more sensible
        },
        // Change node and edge styles such as
        // color and width.
        // These properties are also set per node
        // with dollar prefixed data-properties in the
        // JSON structure.
        Node: {
            overridable: true,
            color: '#2D6A5D',
            type: 'customNode',
            dim: 25
        },
        Edge: {
            overridable: true,
            color: '#222222',
            type: 'customEdge',
            lineWidth: 2,
            alpha: 0.4
        },
        //Native canvas text styling
        Label: {
            type: 'Native', //Native or HTML
            size: 20,
            family: 'arial',
            textBaseline: 'hanging',
            color: '#DDD'
            //style: 'bold'
        },
        //Add Tips
        Tips: {
            enable: false,
            onShow: function (tip, node) {}
        },
        // Add node events
        Events: {
            enable: true,
            enableForEdges: true,
            onMouseMove: function (node, eventInfo, e) {
                onMouseMoveHandler(node, eventInfo, e);
            },
            //Update node positions when dragged
            onDragMove: function (node, eventInfo, e) {
                onDragMoveTopicHandler(node, eventInfo, e);
            },
            onDragEnd: function (node, eventInfo, e) {
                onDragEndTopicHandler(node, eventInfo, e, false);
            },
            onDragCancel: function (node, eventInfo, e) {
                onDragCancelHandler(node, eventInfo, e, false);
            },
            //Implement the same handler for touchscreens
            onTouchStart: function (node, eventInfo, e) {
                //$jit.util.event.stop(e); //stop default touchmove event
                //Mconsole.events.onMouseDown(e, null, eventInfo);
                Mconsole.events.touched = true;
                touchPos = eventInfo.getPos();
                var canvas = Mconsole.canvas,
                    ox = canvas.translateOffsetX;
                oy = canvas.translateOffsetY,
                sx = canvas.scaleOffsetX,
                sy = canvas.scaleOffsetY;
                touchPos.x *= sx;
                touchPos.y *= sy;
                touchPos.x += ox;
                touchPos.y += oy;

                touchDragNode = node;
            },
            //Implement the same handler for touchscreens
            onTouchMove: function (node, eventInfo, e) {
                if (touchDragNode) onDragMoveTopicHandler(touchDragNode, eventInfo, e);
                else {
                    touchPanZoomHandler(eventInfo, e);
                    Mconsole.labels.hideLabel(Mconsole.graph.getNode(MetamapsModel.showcardInUse));
                }
            },
            //Implement the same handler for touchscreens
            onTouchEnd: function (node, eventInfo, e) {

            },
            //Implement the same handler for touchscreens
            onTouchCancel: function (node, eventInfo, e) {

            },
            //Add also a click handler to nodes
            onClick: function (node, eventInfo, e) {
                if (MetamapsModel.boxStartCoordinates) {
                    Mconsole.busy = false;
                    MetamapsModel.boxEndCoordinates = eventInfo.getPos();
                    selectNodesWithBox();
                    return;
                }

                if (e.target.id != "infovis-canvas") return false;

                //clicking on a edge, node, or clicking on blank part of canvas?
                if (node.nodeFrom) {
                    selectEdgeOnClickHandler(node, e);
                } else if (node && !node.nodeFrom) {
                    selectNodeOnClickHandler(node, e);
                } else {
                    //topic and synapse editing cards
                    if (!MetamapsModel.didPan) {
                        hideCards();
                    }
                    canvasDoubleClickHandler(eventInfo.getPos(), e);
                } //if
            },
            onRightClick: function (node, eventInfo, e) {
                e.preventDefault();
                e.stopPropagation();

                if (node && !node.nodeFrom) {
                    selectNodeOnRightClickHandler(node, e);
                } else if (node && node.nodeFrom) { // the variable 'node' is actually an edge/adjacency
                    // open right click menu
                    selectEdgeOnRightClickHandler(node, e);
                } else {
                    // right click on open canvas, options here?
                }
            }
        },
        //Number of iterations for the FD algorithm
        iterations: 200,
        //Edge length
        levelDistance: 200
    };

    if (embed) {
        t.Edge.type = 'customEdgeEmbed';
    }

    if (type == "centered") {
        t.background = {
            CanvasStyles: {
                strokeStyle: '#333',
                lineWidth: 1.5
            }
        };
        t.levelDistance = 280;
        t.Events.enableForEdges = true;
        t.Events.onDragEnd = function (node, eventInfo, e) {
            //different because we can't go realtime
            onDragEndTopicHandler(node, eventInfo, e, false);
        };
        t.Events.onDragCancel = function (node, eventInfo, e) {
            //different because we're centred
            onDragCancelHandler(node, eventInfo, e, true);
        };
    } //if

    return t;
} //graphSettings

function hideCards() {
    $('#edit_synapse').hide();
    MetamapsModel.edgecardInUse = null;
    hideCurrentCard();
    // delete right click menu
    $('.rightclickmenu').remove();
}

// defining code to draw edges with arrows pointing in one direction
var renderMidArrow = function (from, to, dim, swap, canvas, placement, newSynapse) {
    var ctx = canvas.getCtx();
    // invert edge direction 
    if (swap) {
        var tmp = from;
        from = to;
        to = tmp;
    }
    // vect represents a line from tip to tail of the arrow 
    var vect = new $jit.Complex(to.x - from.x, to.y - from.y);
    // scale it 
    vect.$scale(dim / vect.norm());
    // compute the midpoint of the edge line 
    var newX = (to.x - from.x) * placement + from.x;
    var newY = (to.y - from.y) * placement + from.y;
    var midPoint = new $jit.Complex(newX, newY);

    // move midpoint by half the "length" of the arrow so the arrow is centered on the midpoint 
    var arrowPoint = new $jit.Complex((vect.x / 0.7) + midPoint.x, (vect.y / 0.7) + midPoint.y);
    // compute the tail intersection point with the edge line 
    var intermediatePoint = new $jit.Complex(arrowPoint.x - vect.x, arrowPoint.y - vect.y);
    // vector perpendicular to vect 
    var normal = new $jit.Complex(-vect.y / 2, vect.x / 2);
    var v1 = intermediatePoint.add(normal);
    var v2 = intermediatePoint.$add(normal.$scale(-1));

    if (newSynapse) {
        ctx.strokeStyle = "#222222";
        ctx.lineWidth = 2;
        ctx.globalAlpha = 0.4;
    }
    ctx.beginPath();
    ctx.moveTo(from.x, from.y);
    ctx.lineTo(to.x, to.y);
    ctx.stroke();
    ctx.beginPath();
    ctx.moveTo(v1.x, v1.y);
    ctx.lineTo(arrowPoint.x, arrowPoint.y);
    ctx.lineTo(v2.x, v2.y);
    ctx.stroke();
};

// defining custom node type	
var nodeSettings = {
    'customNode': {
        'render': function (node, canvas) {
            var pos = node.pos.getc(true),
                dim = node.getData('dim'),
                cat = node.getData('metacode'),
                whiteCircle = node.getData('whiteCircle'),
                ctx = canvas.getCtx();

            // if the topic is on the Canvas draw a white circle around it
            if (whiteCircle) {
                ctx.beginPath();
                ctx.arc(pos.x, pos.y, dim + 3, 0, 2 * Math.PI, false);
                if (!MetamapsModel.embed) ctx.strokeStyle = 'white';
                if (MetamapsModel.embed) ctx.strokeStyle = '#999';
                ctx.lineWidth = 2;
                ctx.stroke();
            }
            ctx.drawImage(imgArray[cat], pos.x - dim, pos.y - dim, dim * 2, dim * 2);

        },
        'contains': function (node, pos) {
            var npos = node.pos.getc(true),
                dim = node.getData('dim');
            return this.nodeHelper.circle.contains(npos, pos, dim);
        }
    }
}

var renderEdgeArrows = function (edgeHelper, adj) {
        var canvas = Mconsole.canvas;
        var directionCat = adj.getData('category');
        var direction = adj.getData('direction');
        var pos = adj.nodeFrom.pos.getc(true);
        var posChild = adj.nodeTo.pos.getc(true);

        //plot arrow edge 
        if (directionCat == "none") {
            edgeHelper.line.render({
                x: pos.x,
                y: pos.y
            }, {
                x: posChild.x,
                y: posChild.y
            }, canvas);
        } else if (directionCat == "both") {
            renderMidArrow({
                x: pos.x,
                y: pos.y
            }, {
                x: posChild.x,
                y: posChild.y
            }, 13, true, canvas, 0.7);
            renderMidArrow({
                x: pos.x,
                y: pos.y
            }, {
                x: posChild.x,
                y: posChild.y
            }, 13, false, canvas, 0.7);
        } else if (directionCat == "from-to") {
            var direction = adj.data.$direction;
            var inv = (direction && direction.length > 1 && direction[0] != adj.nodeFrom.id);
            renderMidArrow({
                x: pos.x,
                y: pos.y
            }, {
                x: posChild.x,
                y: posChild.y
            }, 13, inv, canvas, 0.7);
            renderMidArrow({
                x: pos.x,
                y: pos.y
            }, {
                x: posChild.x,
                y: posChild.y
            }, 13, inv, canvas, 0.3);
        }
    } //renderEdgeArrow

// defining custom edges
var edgeSettings = {
    'customEdge': {
        'render': function (adj, canvas) {
            //get nodes cartesian coordinates 
            var pos = adj.nodeFrom.pos.getc(true);
            var posChild = adj.nodeTo.pos.getc(true);

            var directionCat = adj.getData("category");
            //label placement on edges 
            renderEdgeArrows(this.edgeHelper, adj);

            //check for edge label in data  
            var desc = adj.getData("desc");
            var showDesc = adj.getData("showDesc");
            if (desc != "" && showDesc) {
                // '&' to '&'
                desc = decodeEntities(desc);

                //now adjust the label placement 
                var ctx = canvas.getCtx();
                ctx.font = 'bold 14px arial';
                ctx.fillStyle = '#FFF';
                ctx.textBaseline = 'hanging';

                // helper function to determine how many lines are needed
                // Line Splitter Function
                // copyright Stephen Chapman, 19th April 2006
                // you may copy this code but please keep the copyright notice as well
                function splitLine(st, n) {
                    var b = '';
                    var s = st;
                    while (s.length > n) {
                        var c = s.substring(0, n);
                        var d = c.lastIndexOf(' ');
                        var e = c.lastIndexOf('\n');
                        if (e != -1) d = e;
                        if (d == -1) d = n;
                        b += c.substring(0, d) + '\n';
                        s = s.substring(d + 1);
                    }
                    return b + s;
                }
                var arrayOfLabelLines = splitLine(desc, 30).split('\n');
                var index, lineWidths = [];
                for (index = 0; index < arrayOfLabelLines.length; ++index) {
                    lineWidths.push(ctx.measureText(arrayOfLabelLines[index]).width)
                }
                var width = Math.max.apply(null, lineWidths) + 8;
                var height = (16 * arrayOfLabelLines.length) + 8;

                var x = (pos.x + posChild.x - width) / 2;
                var y = ((pos.y + posChild.y) / 2) - height / 2;
                var radius = 5;

                //render background
                ctx.beginPath();
                ctx.moveTo(x + radius, y);
                ctx.lineTo(x + width - radius, y);
                ctx.quadraticCurveTo(x + width, y, x + width, y + radius);
                ctx.lineTo(x + width, y + height - radius);
                ctx.quadraticCurveTo(x + width, y + height, x + width - radius, y + height);
                ctx.lineTo(x + radius, y + height);
                ctx.quadraticCurveTo(x, y + height, x, y + height - radius);
                ctx.lineTo(x, y + radius);
                ctx.quadraticCurveTo(x, y, x + radius, y);
                ctx.closePath();
                ctx.fill();

                //render text
                ctx.fillStyle = '#222222';
                ctx.textAlign = 'center';
                for (index = 0; index < arrayOfLabelLines.length; ++index) {
                    ctx.fillText(arrayOfLabelLines[index], x + (width / 2), y + 5 + (16 * index));
                }
            }
        },
        'contains': function (adj, pos) {
            var from = adj.nodeFrom.pos.getc(true),
                to = adj.nodeTo.pos.getc(true);
            return this.edgeHelper.line.contains(from, to, pos, adj.Edge.epsilon);
        }
    }
}

var edgeSettingsEmbed = {
    'customEdgeEmbed': {
        'render': function (adj, canvas) {
            //get nodes cartesian coordinates 
            var pos = adj.nodeFrom.pos.getc(true);
            var posChild = adj.nodeTo.pos.getc(true);

            var directionCat = adj.getData("category");
            //label placement on edges 
            renderEdgeArrows(this.edgeHelper, adj);

            //check for edge label in data  
            var desc = adj.getData("desc");
            var showDesc = adj.getData("showDesc");
            if (desc != "" && showDesc) {
                // '&amp;' to '&'
                desc = decodeEntities(desc);

                //now adjust the label placement 
                var ctx = canvas.getCtx();
                var radius = canvas.getSize();
                var x = parseInt((pos.x + posChild.x - (desc.length * 5)) / 2);
                var y = parseInt((pos.y + posChild.y) / 2);
                ctx.font = 'bold 14px arial';

                //render background
                ctx.fillStyle = '#999';
                var margin = 5;
                var height = 14 + margin; //font size + margin
                var CURVE = height / 2; //offset for curvy corners
                var width = ctx.measureText(desc).width + 2 * margin - 2 * CURVE
                var labelX = x - margin + CURVE;
                var labelY = y - height + margin;
                ctx.fillRect(labelX, labelY, width, height);

                //curvy corners woo - circles in place of last CURVE pixels of rect
                ctx.beginPath();
                ctx.arc(labelX, labelY + CURVE, CURVE, 0, 2 * Math.PI, false);
                ctx.arc(labelX + width, labelY + CURVE, CURVE, 0, 2 * Math.PI, false);
                ctx.fill();

                //render text
                ctx.fillStyle = '#000';
                ctx.fillText(desc, x, y);
            }
        },
        'contains': function (adj, pos) {
            var from = adj.nodeFrom.pos.getc(true),
                to = adj.nodeTo.pos.getc(true);
            return this.edgeHelper.line.contains(from, to, pos, adj.Edge.epsilon);
        }
    }
}

function drawSelectBox(eventInfo, e) {
    Mconsole.plot();
    var ctx = Mconsole.canvas.getCtx();

    var startX = MetamapsModel.boxStartCoordinates.x,
        startY = MetamapsModel.boxStartCoordinates.y,
        currX = eventInfo.getPos().x,
        currY = eventInfo.getPos().y;

    Mconsole.plot();
    ctx.beginPath();
    ctx.moveTo(startX, startY);
    ctx.lineTo(startX, currY);
    ctx.lineTo(currX, currY);
    ctx.lineTo(currX, startY);
    ctx.lineTo(startX, startY);
    ctx.strokeStyle = "black";
    ctx.stroke();
}

function selectNodesWithBox() {

    var sX = MetamapsModel.boxStartCoordinates.x,
        sY = MetamapsModel.boxStartCoordinates.y,
        eX = MetamapsModel.boxEndCoordinates.x,
        eY = MetamapsModel.boxEndCoordinates.y;


    Mconsole.graph.eachNode(function (n) {
        var x = gType == "centered" ? n.pos.toComplex().x : n.pos.x,
            y = gType == "centered" ? n.pos.toComplex().y : n.pos.y;

        if ((sX < x && x < eX && sY < y && y < eY) || (sX > x && x > eX && sY > y && y > eY) || (sX > x && x > eX && sY < y && y < eY) || (sX < x && x < eX && sY > y && y > eY)) {
            var nodeIsSelected = MetamapsModel.selectedNodes.indexOf(n);
            if (nodeIsSelected == -1) selectNode(n); // the node is not selected, so select it
            else if (nodeIsSelected != -1) deselectNode(n); // the node is selected, so deselect it

        }
    });

    MetamapsModel.boxStartCoordinates = false;
    MetamapsModel.boxEndCoordinates = false;
    Mconsole.plot();
}

function onMouseMoveHandler(node, eventInfo, e) {

    if (Mconsole.busy) return;

    var node = eventInfo.getNode();
    var edge = eventInfo.getEdge();

    //if we're on top of a node object, act like there aren't edges under it
    if (node != false) {
        if (MetamapsModel.edgeHoveringOver) {
            onMouseLeave(MetamapsModel.edgeHoveringOver);
        }
        $('canvas').css('cursor', 'pointer');
        return;
    }

    if (edge == false && MetamapsModel.edgeHoveringOver != false) {
        //mouse not on an edge, but we were on an edge previously
        onMouseLeave(MetamapsModel.edgeHoveringOver);
    } else if (edge != false && MetamapsModel.edgeHoveringOver == false) {
        //mouse is on an edge, but there isn't a stored edge
        onMouseEnter(edge);
    } else if (edge != false && MetamapsModel.edgeHoveringOver != edge) {
        //mouse is on an edge, but a different edge is stored
        onMouseLeave(MetamapsModel.edgeHoveringOver)
        onMouseEnter(edge);
    }

    //could be false
    MetamapsModel.edgeHoveringOver = edge;

    if (!node && !edge) {
        $('canvas').css('cursor', 'default');
    }
}

function onMouseEnter(edge) {
    $('canvas').css('cursor', 'pointer');
    var edgeIsSelected = MetamapsModel.selectedEdges.indexOf(edge);
    //following if statement only executes if the edge being hovered over is not selected
    if (edgeIsSelected == -1) {
        edge.setData('showDesc', true, 'current');
        edge.setDataset('end', {
            lineWidth: 4,
            alpha: 1
        });
        Mconsole.fx.animate({
            modes: ['edge-property:lineWidth:color:alpha'],
            duration: 100
        });
        Mconsole.plot();
    }
}

function onMouseLeave(edge) {
    $('canvas').css('cursor', 'default');
    var edgeIsSelected = MetamapsModel.selectedEdges.indexOf(edge);
    //following if statement only executes if the edge being hovered over is not selected
    if (edgeIsSelected == -1) {
        edge.setData('showDesc', false, 'current');
        edge.setDataset('end', {
            lineWidth: 2,
            alpha: 0.4
        });
        Mconsole.fx.animate({
            modes: ['edge-property:lineWidth:color:alpha'],
            duration: 100
        });
    }
    Mconsole.plot();
}

function onDragEndTopicHandler(node, eventInfo, e, allowRealtime) {
    if (tempInit && tempNode2 == null) {
        $('#topic_addSynapse').val("true");
        $('#new_topic').fadeIn('fast');
        $('#topic_name').focus();
    } else if (tempInit && tempNode2 != null) {
        $('#topic_addSynapse').val("false");
        $('#synapse_topic1id').val(tempNode.id);
        $('#synapse_topic2id').val(tempNode2.id);
        $('#new_synapse').fadeIn('fast');
        $('#synapse_desc').typeahead('setQuery', '').focus();
        tempNode = null;
        tempNode2 = null;
        tempInit = false;
    } else if (dragged && dragged != 0 && goRealtime) {
        saveLayout(dragged);
        for (var i = 0; i < MetamapsModel.selectedNodes.length; i++) {
            saveLayout(MetamapsModel.selectedNodes[i].id);
        }
    }
} //onDragEndTopicHandler

function onDragCancelHandler(node, eventInfo, e, centred) {
    tempNode = null;
    tempNode2 = null;
    tempInit = false;

    //not sure why this doesn't happen for centred graphs
    if (!centred) {
        $('#topic_addSynapse').val("false");
        $('#topic_topic1id').val(0);
        $('#topic_topic2id').val(0);
    }
    Mconsole.plot();
}

// thanks to http://stackoverflow.com/questions/4338963/
// convert-html-character-entities-back-to-regular-text-using-javascript
function decodeEntities(desc) {
    var str, temp = document.createElement('p');
    temp.innerHTML = desc; //browser handles the entities
    str = temp.textContent || temp.innerText;
    temp = null; //delete the element;
    return str;
} //decodeEntities