var util = require('../util'); /** * @class Node * A node. A node can be connected to other nodes via one or multiple edges. * @param {object} properties An object containing properties for the node. All * properties are optional, except for the id. * {number} id Id of the node. Required * {string} label Text label for the node * {number} x Horizontal position of the node * {number} y Vertical position of the node * {string} shape Node shape, available: * "database", "circle", "ellipse", * "box", "image", "text", "dot", * "star", "triangle", "triangleDown", * "square" * {string} image An image url * {string} title An title text, can be HTML * {anytype} group A group name or number * @param {Network.Images} imagelist A list with images. Only needed * when the node has an image * @param {Network.Groups} grouplist A list with groups. Needed for * retrieving group properties * @param {Object} constants An object with default values for * example for the color * */ function Node(properties, imagelist, grouplist, networkConstants) { var constants = util.selectiveBridgeObject(['nodes'],networkConstants); this.options = constants.nodes; this.selected = false; this.hover = false; this.edges = []; // all edges connected to this node this.dynamicEdges = []; this.reroutedEdges = {}; this.fontDrawThreshold = 3; // set defaults for the properties this.id = undefined; this.x = null; this.y = null; this.allowedToMoveX = false; this.allowedToMoveY = false; this.xFixed = false; this.yFixed = false; this.horizontalAlignLeft = true; // these are for the navigation controls this.verticalAlignTop = true; // these are for the navigation controls this.baseRadiusValue = networkConstants.nodes.radius; this.radiusFixed = false; this.level = -1; this.preassignedLevel = false; this.hierarchyEnumerated = false; this.labelDimensions = {top:0,left:0,width:0,height:0,yLine:0}; // could be cached this.dirtyLabel = true; this.imagelist = imagelist; this.grouplist = grouplist; // physics properties this.fx = 0.0; // external force x this.fy = 0.0; // external force y this.vx = 0.0; // velocity x this.vy = 0.0; // velocity y this.damping = networkConstants.physics.damping; // written every time gravity is calculated this.fixedData = {x:null,y:null}; this.setProperties(properties, constants); // creating the variables for clustering this.resetCluster(); this.dynamicEdgesLength = 0; this.clusterSession = 0; this.clusterSizeWidthFactor = networkConstants.clustering.nodeScaling.width; this.clusterSizeHeightFactor = networkConstants.clustering.nodeScaling.height; this.clusterSizeRadiusFactor = networkConstants.clustering.nodeScaling.radius; this.maxNodeSizeIncrements = networkConstants.clustering.maxNodeSizeIncrements; this.growthIndicator = 0; // variables to tell the node about the network. this.networkScaleInv = 1; this.networkScale = 1; this.canvasTopLeft = {"x": -300, "y": -300}; this.canvasBottomRight = {"x": 300, "y": 300}; this.parentEdgeId = null; } /** * (re)setting the clustering variables and objects */ Node.prototype.resetCluster = function() { // clustering variables this.formationScale = undefined; // this is used to determine when to open the cluster this.clusterSize = 1; // this signifies the total amount of nodes in this cluster this.containedNodes = {}; this.containedEdges = {}; this.clusterSessions = []; }; /** * Attach a edge to the node * @param {Edge} edge */ Node.prototype.attachEdge = function(edge) { if (this.edges.indexOf(edge) == -1) { this.edges.push(edge); } if (this.dynamicEdges.indexOf(edge) == -1) { this.dynamicEdges.push(edge); } this.dynamicEdgesLength = this.dynamicEdges.length; }; /** * Detach a edge from the node * @param {Edge} edge */ Node.prototype.detachEdge = function(edge) { var index = this.edges.indexOf(edge); if (index != -1) { this.edges.splice(index, 1); } index = this.dynamicEdges.indexOf(edge); if (index != -1) { this.dynamicEdges.splice(index, 1); } this.dynamicEdgesLength = this.dynamicEdges.length; }; /** * Set or overwrite properties for the node * @param {Object} properties an object with properties * @param {Object} constants and object with default, global properties */ Node.prototype.setProperties = function(properties, constants) { if (!properties) { return; } var fields = ['borderWidth','borderWidthSelected','shape','image','brokenImage','radius','fontColor', 'fontSize','fontFace','fontFill','group','mass' ]; util.selectiveDeepExtend(fields, this.options, properties); this.originalLabel = undefined; // basic properties if (properties.id !== undefined) {this.id = properties.id;} if (properties.label !== undefined) {this.label = properties.label; this.originalLabel = properties.label; this.dirtyLabel = true;} if (properties.title !== undefined) {this.title = properties.title;} if (properties.x !== undefined) {this.x = properties.x;} if (properties.y !== undefined) {this.y = properties.y;} if (properties.value !== undefined) {this.value = properties.value;} if (properties.level !== undefined) {this.level = properties.level; this.preassignedLevel = true;} // navigation controls properties if (properties.horizontalAlignLeft !== undefined) {this.horizontalAlignLeft = properties.horizontalAlignLeft;} if (properties.verticalAlignTop !== undefined) {this.verticalAlignTop = properties.verticalAlignTop;} if (properties.triggerFunction !== undefined) {this.triggerFunction = properties.triggerFunction;} if (this.id === undefined) { throw "Node must have an id"; } // copy group properties if (typeof this.options.group === 'number' || (typeof this.options.group === 'string' && this.options.group != '')) { var groupObj = this.grouplist.get(this.options.group); for (var prop in groupObj) { if (groupObj.hasOwnProperty(prop)) { this.options[prop] = groupObj[prop]; } } } // individual shape properties if (properties.radius !== undefined) {this.baseRadiusValue = this.options.radius;} if (properties.color !== undefined) {this.options.color = util.parseColor(properties.color);} if (this.options.image!== undefined && this.options.image!= "") { if (this.imagelist) { this.imageObj = this.imagelist.load(this.options.image, this.options.brokenImage); } else { throw "No imagelist provided"; } } if (properties.allowedToMoveX !== undefined) { this.xFixed = !properties.allowedToMoveX; this.allowedToMoveX = properties.allowedToMoveX; } else if (properties.x !== undefined && this.allowedToMoveX == false) { this.xFixed = true; } if (properties.allowedToMoveY !== undefined) { this.yFixed = !properties.allowedToMoveY; this.allowedToMoveY = properties.allowedToMoveY; } else if (properties.y !== undefined && this.allowedToMoveY == false) { this.yFixed = true; } this.radiusFixed = this.radiusFixed || (properties.radius !== undefined); if (this.options.shape == 'image') { this.options.radiusMin = constants.nodes.widthMin; this.options.radiusMax = constants.nodes.widthMax; } // choose draw method depending on the shape switch (this.options.shape) { case 'database': this.draw = this._drawDatabase; this.resize = this._resizeDatabase; break; case 'box': this.draw = this._drawBox; this.resize = this._resizeBox; break; case 'circle': this.draw = this._drawCircle; this.resize = this._resizeCircle; break; case 'ellipse': this.draw = this._drawEllipse; this.resize = this._resizeEllipse; break; // TODO: add diamond shape case 'image': this.draw = this._drawImage; this.resize = this._resizeImage; break; case 'text': this.draw = this._drawText; this.resize = this._resizeText; break; case 'dot': this.draw = this._drawDot; this.resize = this._resizeShape; break; case 'square': this.draw = this._drawSquare; this.resize = this._resizeShape; break; case 'triangle': this.draw = this._drawTriangle; this.resize = this._resizeShape; break; case 'triangleDown': this.draw = this._drawTriangleDown; this.resize = this._resizeShape; break; case 'star': this.draw = this._drawStar; this.resize = this._resizeShape; break; default: this.draw = this._drawEllipse; this.resize = this._resizeEllipse; break; } // reset the size of the node, this can be changed this._reset(); }; /** * select this node */ Node.prototype.select = function() { this.selected = true; this._reset(); }; /** * unselect this node */ Node.prototype.unselect = function() { this.selected = false; this._reset(); }; /** * Reset the calculated size of the node, forces it to recalculate its size */ Node.prototype.clearSizeCache = function() { this._reset(); }; /** * Reset the calculated size of the node, forces it to recalculate its size * @private */ Node.prototype._reset = function() { this.width = undefined; this.height = undefined; }; /** * get the title of this node. * @return {string} title The title of the node, or undefined when no title * has been set. */ Node.prototype.getTitle = function() { return typeof this.title === "function" ? this.title() : this.title; }; /** * Calculate the distance to the border of the Node * @param {CanvasRenderingContext2D} ctx * @param {Number} angle Angle in radians * @returns {number} distance Distance to the border in pixels */ Node.prototype.distanceToBorder = function (ctx, angle) { var borderWidth = 1; if (!this.width) { this.resize(ctx); } switch (this.options.shape) { case 'circle': case 'dot': return this.options.radius+ borderWidth; case 'ellipse': var a = this.width / 2; var b = this.height / 2; var w = (Math.sin(angle) * a); var h = (Math.cos(angle) * b); return a * b / Math.sqrt(w * w + h * h); // TODO: implement distanceToBorder for database // TODO: implement distanceToBorder for triangle // TODO: implement distanceToBorder for triangleDown case 'box': case 'image': case 'text': default: if (this.width) { return Math.min( Math.abs(this.width / 2 / Math.cos(angle)), Math.abs(this.height / 2 / Math.sin(angle))) + borderWidth; // TODO: reckon with border radius too in case of box } else { return 0; } } // TODO: implement calculation of distance to border for all shapes }; /** * Set forces acting on the node * @param {number} fx Force in horizontal direction * @param {number} fy Force in vertical direction */ Node.prototype._setForce = function(fx, fy) { this.fx = fx; this.fy = fy; }; /** * Add forces acting on the node * @param {number} fx Force in horizontal direction * @param {number} fy Force in vertical direction * @private */ Node.prototype._addForce = function(fx, fy) { this.fx += fx; this.fy += fy; }; /** * Perform one discrete step for the node * @param {number} interval Time interval in seconds */ Node.prototype.discreteStep = function(interval) { if (!this.xFixed) { var dx = this.damping * this.vx; // damping force var ax = (this.fx - dx) / this.options.mass; // acceleration this.vx += ax * interval; // velocity this.x += this.vx * interval; // position } else { this.fx = 0; this.vx = 0; } if (!this.yFixed) { var dy = this.damping * this.vy; // damping force var ay = (this.fy - dy) / this.options.mass; // acceleration this.vy += ay * interval; // velocity this.y += this.vy * interval; // position } else { this.fy = 0; this.vy = 0; } }; /** * Perform one discrete step for the node * @param {number} interval Time interval in seconds * @param {number} maxVelocity The speed limit imposed on the velocity */ Node.prototype.discreteStepLimited = function(interval, maxVelocity) { if (!this.xFixed) { var dx = this.damping * this.vx; // damping force var ax = (this.fx - dx) / this.options.mass; // acceleration this.vx += ax * interval; // velocity this.vx = (Math.abs(this.vx) > maxVelocity) ? ((this.vx > 0) ? maxVelocity : -maxVelocity) : this.vx; this.x += this.vx * interval; // position } else { this.fx = 0; this.vx = 0; } if (!this.yFixed) { var dy = this.damping * this.vy; // damping force var ay = (this.fy - dy) / this.options.mass; // acceleration this.vy += ay * interval; // velocity this.vy = (Math.abs(this.vy) > maxVelocity) ? ((this.vy > 0) ? maxVelocity : -maxVelocity) : this.vy; this.y += this.vy * interval; // position } else { this.fy = 0; this.vy = 0; } }; /** * Check if this node has a fixed x and y position * @return {boolean} true if fixed, false if not */ Node.prototype.isFixed = function() { return (this.xFixed && this.yFixed); }; /** * Check if this node is moving * @param {number} vmin the minimum velocity considered as "moving" * @return {boolean} true if moving, false if it has no velocity */ Node.prototype.isMoving = function(vmin) { var velocity = Math.sqrt(Math.pow(this.vx,2) + Math.pow(this.vy,2)); // this.velocity = Math.sqrt(Math.pow(this.vx,2) + Math.pow(this.vy,2)) return (velocity > vmin); }; /** * check if this node is selecte * @return {boolean} selected True if node is selected, else false */ Node.prototype.isSelected = function() { return this.selected; }; /** * Retrieve the value of the node. Can be undefined * @return {Number} value */ Node.prototype.getValue = function() { return this.value; }; /** * Calculate the distance from the nodes location to the given location (x,y) * @param {Number} x * @param {Number} y * @return {Number} value */ Node.prototype.getDistance = function(x, y) { var dx = this.x - x, dy = this.y - y; return Math.sqrt(dx * dx + dy * dy); }; /** * Adjust the value range of the node. The node will adjust it's radius * based on its value. * @param {Number} min * @param {Number} max */ Node.prototype.setValueRange = function(min, max) { if (!this.radiusFixed && this.value !== undefined) { if (max == min) { this.options.radius= (this.options.radiusMin + this.options.radiusMax) / 2; } else { var scale = (this.options.radiusMax - this.options.radiusMin) / (max - min); this.options.radius= (this.value - min) * scale + this.options.radiusMin; } } this.baseRadiusValue = this.options.radius; }; /** * Draw this node in the given canvas * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d"); * @param {CanvasRenderingContext2D} ctx */ Node.prototype.draw = function(ctx) { throw "Draw method not initialized for node"; }; /** * Recalculate the size of this node in the given canvas * The 2d context of a HTML canvas can be retrieved by canvas.getContext("2d"); * @param {CanvasRenderingContext2D} ctx */ Node.prototype.resize = function(ctx) { throw "Resize method not initialized for node"; }; /** * Check if this object is overlapping with the provided object * @param {Object} obj an object with parameters left, top, right, bottom * @return {boolean} True if location is located on node */ Node.prototype.isOverlappingWith = function(obj) { return (this.left < obj.right && this.left + this.width > obj.left && this.top < obj.bottom && this.top + this.height > obj.top); }; Node.prototype._resizeImage = function (ctx) { // TODO: pre calculate the image size if (!this.width || !this.height) { // undefined or 0 var width, height; if (this.value) { this.options.radius= this.baseRadiusValue; var scale = this.imageObj.height / this.imageObj.width; if (scale !== undefined) { width = this.options.radius|| this.imageObj.width; height = this.options.radius* scale || this.imageObj.height; } else { width = 0; height = 0; } } else { width = this.imageObj.width; height = this.imageObj.height; } this.width = width; this.height = height; this.growthIndicator = 0; if (this.width > 0 && this.height > 0) { this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeHeightFactor; this.options.radius+= Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeRadiusFactor; this.growthIndicator = this.width - width; } } }; Node.prototype._drawImage = function (ctx) { this._resizeImage(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var yLabel; if (this.imageObj.width != 0 ) { // draw the shade if (this.clusterSize > 1) { var lineWidth = ((this.clusterSize > 1) ? 10 : 0.0); lineWidth *= this.networkScaleInv; lineWidth = Math.min(0.2 * this.width,lineWidth); ctx.globalAlpha = 0.5; ctx.drawImage(this.imageObj, this.left - lineWidth, this.top - lineWidth, this.width + 2*lineWidth, this.height + 2*lineWidth); } // draw the image ctx.globalAlpha = 1.0; ctx.drawImage(this.imageObj, this.left, this.top, this.width, this.height); yLabel = this.y + this.height / 2; } else { // image still loading... just draw the label for now yLabel = this.y; } this._label(ctx, this.label, this.x, yLabel, undefined, "top"); }; Node.prototype._resizeBox = function (ctx) { if (!this.width) { var margin = 5; var textSize = this.getTextSize(ctx); this.width = textSize.width + 2 * margin; this.height = textSize.height + 2 * margin; this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeHeightFactor; this.growthIndicator = this.width - (textSize.width + 2 * margin); // this.options.radius+= Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeRadiusFactor; } }; Node.prototype._drawBox = function (ctx) { this._resizeBox(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var clusterLineWidth = 2.5; var borderWidth = this.options.borderWidth; var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth; ctx.strokeStyle = this.selected ? this.options.color.highlight.border : this.hover ? this.options.color.hover.border : this.options.color.border; // draw the outer border if (this.clusterSize > 1) { ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.roundRect(this.left-2*ctx.lineWidth, this.top-2*ctx.lineWidth, this.width+4*ctx.lineWidth, this.height+4*ctx.lineWidth, this.options.radius); ctx.stroke(); } ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.fillStyle = this.selected ? this.options.color.highlight.background : this.options.color.background; ctx.roundRect(this.left, this.top, this.width, this.height, this.options.radius); ctx.fill(); ctx.stroke(); this._label(ctx, this.label, this.x, this.y); }; Node.prototype._resizeDatabase = function (ctx) { if (!this.width) { var margin = 5; var textSize = this.getTextSize(ctx); var size = textSize.width + 2 * margin; this.width = size; this.height = size; // scaling used for clustering this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeHeightFactor; this.options.radius+= Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeRadiusFactor; this.growthIndicator = this.width - size; } }; Node.prototype._drawDatabase = function (ctx) { this._resizeDatabase(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var clusterLineWidth = 2.5; var borderWidth = this.options.borderWidth; var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth; ctx.strokeStyle = this.selected ? this.options.color.highlight.border : this.hover ? this.options.color.hover.border : this.options.color.border; // draw the outer border if (this.clusterSize > 1) { ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.database(this.x - this.width/2 - 2*ctx.lineWidth, this.y - this.height*0.5 - 2*ctx.lineWidth, this.width + 4*ctx.lineWidth, this.height + 4*ctx.lineWidth); ctx.stroke(); } ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.fillStyle = this.selected ? this.options.color.highlight.background : this.hover ? this.options.color.hover.background : this.options.color.background; ctx.database(this.x - this.width/2, this.y - this.height*0.5, this.width, this.height); ctx.fill(); ctx.stroke(); this._label(ctx, this.label, this.x, this.y); }; Node.prototype._resizeCircle = function (ctx) { if (!this.width) { var margin = 5; var textSize = this.getTextSize(ctx); var diameter = Math.max(textSize.width, textSize.height) + 2 * margin; this.options.radius = diameter / 2; this.width = diameter; this.height = diameter; // scaling used for clustering // this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeWidthFactor; // this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeHeightFactor; this.options.radius += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeRadiusFactor; this.growthIndicator = this.options.radius- 0.5*diameter; } }; Node.prototype._drawCircle = function (ctx) { this._resizeCircle(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var clusterLineWidth = 2.5; var borderWidth = this.options.borderWidth; var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth; ctx.strokeStyle = this.selected ? this.options.color.highlight.border : this.hover ? this.options.color.hover.border : this.options.color.border; // draw the outer border if (this.clusterSize > 1) { ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.circle(this.x, this.y, this.options.radius+2*ctx.lineWidth); ctx.stroke(); } ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.fillStyle = this.selected ? this.options.color.highlight.background : this.hover ? this.options.color.hover.background : this.options.color.background; ctx.circle(this.x, this.y, this.options.radius); ctx.fill(); ctx.stroke(); this._label(ctx, this.label, this.x, this.y); }; Node.prototype._resizeEllipse = function (ctx) { if (!this.width) { var textSize = this.getTextSize(ctx); this.width = textSize.width * 1.5; this.height = textSize.height * 2; if (this.width < this.height) { this.width = this.height; } var defaultSize = this.width; // scaling used for clustering this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeHeightFactor; this.options.radius += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeRadiusFactor; this.growthIndicator = this.width - defaultSize; } }; Node.prototype._drawEllipse = function (ctx) { this._resizeEllipse(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var clusterLineWidth = 2.5; var borderWidth = this.options.borderWidth; var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth; ctx.strokeStyle = this.selected ? this.options.color.highlight.border : this.hover ? this.options.color.hover.border : this.options.color.border; // draw the outer border if (this.clusterSize > 1) { ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.ellipse(this.left-2*ctx.lineWidth, this.top-2*ctx.lineWidth, this.width+4*ctx.lineWidth, this.height+4*ctx.lineWidth); ctx.stroke(); } ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.fillStyle = this.selected ? this.options.color.highlight.background : this.hover ? this.options.color.hover.background : this.options.color.background; ctx.ellipse(this.left, this.top, this.width, this.height); ctx.fill(); ctx.stroke(); this._label(ctx, this.label, this.x, this.y); }; Node.prototype._drawDot = function (ctx) { this._drawShape(ctx, 'circle'); }; Node.prototype._drawTriangle = function (ctx) { this._drawShape(ctx, 'triangle'); }; Node.prototype._drawTriangleDown = function (ctx) { this._drawShape(ctx, 'triangleDown'); }; Node.prototype._drawSquare = function (ctx) { this._drawShape(ctx, 'square'); }; Node.prototype._drawStar = function (ctx) { this._drawShape(ctx, 'star'); }; Node.prototype._resizeShape = function (ctx) { if (!this.width) { this.options.radius= this.baseRadiusValue; var size = 2 * this.options.radius; this.width = size; this.height = size; // scaling used for clustering this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeHeightFactor; this.options.radius+= Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * 0.5 * this.clusterSizeRadiusFactor; this.growthIndicator = this.width - size; } }; Node.prototype._drawShape = function (ctx, shape) { this._resizeShape(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; var clusterLineWidth = 2.5; var borderWidth = this.options.borderWidth; var selectionLineWidth = this.options.borderWidthSelected || 2 * this.options.borderWidth; var radiusMultiplier = 2; // choose draw method depending on the shape switch (shape) { case 'dot': radiusMultiplier = 2; break; case 'square': radiusMultiplier = 2; break; case 'triangle': radiusMultiplier = 3; break; case 'triangleDown': radiusMultiplier = 3; break; case 'star': radiusMultiplier = 4; break; } ctx.strokeStyle = this.selected ? this.options.color.highlight.border : this.hover ? this.options.color.hover.border : this.options.color.border; // draw the outer border if (this.clusterSize > 1) { ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx[shape](this.x, this.y, this.options.radius+ radiusMultiplier * ctx.lineWidth); ctx.stroke(); } ctx.lineWidth = (this.selected ? selectionLineWidth : borderWidth) + ((this.clusterSize > 1) ? clusterLineWidth : 0.0); ctx.lineWidth *= this.networkScaleInv; ctx.lineWidth = Math.min(this.width,ctx.lineWidth); ctx.fillStyle = this.selected ? this.options.color.highlight.background : this.hover ? this.options.color.hover.background : this.options.color.background; ctx[shape](this.x, this.y, this.options.radius); ctx.fill(); ctx.stroke(); if (this.label) { this._label(ctx, this.label, this.x, this.y + this.height / 2, undefined, 'top',true); } }; Node.prototype._resizeText = function (ctx) { if (!this.width) { var margin = 5; var textSize = this.getTextSize(ctx); this.width = textSize.width + 2 * margin; this.height = textSize.height + 2 * margin; // scaling used for clustering this.width += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeWidthFactor; this.height += Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeHeightFactor; this.options.radius+= Math.min(this.clusterSize - 1, this.maxNodeSizeIncrements) * this.clusterSizeRadiusFactor; this.growthIndicator = this.width - (textSize.width + 2 * margin); } }; Node.prototype._drawText = function (ctx) { this._resizeText(ctx); this.left = this.x - this.width / 2; this.top = this.y - this.height / 2; this._label(ctx, this.label, this.x, this.y); }; Node.prototype._label = function (ctx, text, x, y, align, baseline, labelUnderNode) { if (text && Number(this.options.fontSize) * this.networkScale > this.fontDrawThreshold) { ctx.font = (this.selected ? "bold " : "") + this.options.fontSize + "px " + this.options.fontFace; var lines = text.split('\n'); var lineCount = lines.length; var fontSize = (Number(this.options.fontSize) + 4); var yLine = y + (1 - lineCount) / 2 * fontSize; if (labelUnderNode == true) { yLine = y + (1 - lineCount) / (2 * fontSize); } // font fill from edges now for nodes! var width = ctx.measureText(lines[0]).width; for (var i = 1; i < lineCount; i++) { var lineWidth = ctx.measureText(lines[i]).width; width = lineWidth > width ? lineWidth : width; } var height = this.options.fontSize * lineCount; var left = x - width / 2; var top = y - height / 2; if (ctx.textBaseline == "top") { top += 0.5 * fontSize; } this.labelDimensions = {top:top,left:left,width:width,height:height,yLine:yLine}; // create the fontfill background if (this.options.fontFill !== undefined && this.options.fontFill !== null && this.options.fontFill !== "none") { ctx.fillStyle = this.options.fontFill; ctx.fillRect(left, top, width, height); } // draw text ctx.fillStyle = this.options.fontColor || "black"; ctx.textAlign = align || "center"; ctx.textBaseline = baseline || "middle"; for (var i = 0; i < lineCount; i++) { ctx.fillText(lines[i], x, yLine); yLine += fontSize; } } }; Node.prototype.getTextSize = function(ctx) { if (this.label !== undefined) { ctx.font = (this.selected ? "bold " : "") + this.options.fontSize + "px " + this.options.fontFace; var lines = this.label.split('\n'), height = (Number(this.options.fontSize) + 4) * lines.length, width = 0; for (var i = 0, iMax = lines.length; i < iMax; i++) { width = Math.max(width, ctx.measureText(lines[i]).width); } return {"width": width, "height": height}; } else { return {"width": 0, "height": 0}; } }; /** * this is used to determine if a node is visible at all. this is used to determine when it needs to be drawn. * there is a safety margin of 0.3 * width; * * @returns {boolean} */ Node.prototype.inArea = function() { if (this.width !== undefined) { return (this.x + this.width *this.networkScaleInv >= this.canvasTopLeft.x && this.x - this.width *this.networkScaleInv < this.canvasBottomRight.x && this.y + this.height*this.networkScaleInv >= this.canvasTopLeft.y && this.y - this.height*this.networkScaleInv < this.canvasBottomRight.y); } else { return true; } }; /** * checks if the core of the node is in the display area, this is used for opening clusters around zoom * @returns {boolean} */ Node.prototype.inView = function() { return (this.x >= this.canvasTopLeft.x && this.x < this.canvasBottomRight.x && this.y >= this.canvasTopLeft.y && this.y < this.canvasBottomRight.y); }; /** * This allows the zoom level of the network to influence the rendering * We store the inverted scale and the coordinates of the top left, and bottom right points of the canvas * * @param scale * @param canvasTopLeft * @param canvasBottomRight */ Node.prototype.setScaleAndPos = function(scale,canvasTopLeft,canvasBottomRight) { this.networkScaleInv = 1.0/scale; this.networkScale = scale; this.canvasTopLeft = canvasTopLeft; this.canvasBottomRight = canvasBottomRight; }; /** * This allows the zoom level of the network to influence the rendering * * @param scale */ Node.prototype.setScale = function(scale) { this.networkScaleInv = 1.0/scale; this.networkScale = scale; }; /** * set the velocity at 0. Is called when this node is contained in another during clustering */ Node.prototype.clearVelocity = function() { this.vx = 0; this.vy = 0; }; /** * Basic preservation of (kinectic) energy * * @param massBeforeClustering */ Node.prototype.updateVelocity = function(massBeforeClustering) { var energyBefore = this.vx * this.vx * massBeforeClustering; //this.vx = (this.vx < 0) ? -Math.sqrt(energyBefore/this.options.mass) : Math.sqrt(energyBefore/this.options.mass); this.vx = Math.sqrt(energyBefore/this.options.mass); energyBefore = this.vy * this.vy * massBeforeClustering; //this.vy = (this.vy < 0) ? -Math.sqrt(energyBefore/this.options.mass) : Math.sqrt(energyBefore/this.options.mass); this.vy = Math.sqrt(energyBefore/this.options.mass); }; module.exports = Node;