import { selection, select } from "d3-selection";
import { max, min, sum, cumsum } from "d3-array";
import { tree, stratify } from "d3-hierarchy";
import { zoom, zoomIdentity } from "d3-zoom";
import { flextree } from 'd3-flextree';
import { linkHorizontal } from 'd3-shape';
const d3 = {
selection,
select,
max,
min,
sum,
cumsum,
tree,
stratify,
zoom,
zoomIdentity,
linkHorizontal,
}
export class OrgChart {
constructor() {
// Exposed variables
const attrs = {
id: `ID${Math.floor(Math.random() * 1000000)}`, // Id for event handlings
firstDraw: true,
svgWidth: 800,
svgHeight: window.innerHeight - 100,
scaleExtent:[0.001, 20],
container: "body",
defaultTextFill: "#2C3E50",
defaultFont: "Helvetica",
ctx: document.createElement('canvas').getContext('2d'),
data: null,
duration: 400,
setActiveNodeCentered: true,
expandLevel: 3,
compact: true,
rootMargin: 40,
nodeDefaultBackground: 'none',
connections: [],
lastTransform: { x: 0, y: 0, k: 1 },
nodeId: d => d.nodeId || d.id,
parentNodeId: d => d.parentNodeId || d.parentId,
backgroundColor: 'none',
zoomBehavior: null,
defs: function (state, visibleConnections) {
return `
${visibleConnections.map(conn => {
const labelWidth = this.getTextWidth(conn.label, { ctx: state.ctx, fontSize: 2, defaultFont: state.defaultFont });
return `
${conn.label || ''}
`}).join("")}
`},
connectionsUpdate: function (d, i, arr) {
d3.select(this)
.attr("stroke", d => '#152785')
.attr('stroke-linecap', 'round')
.attr("stroke-width", d => '5')
.attr('pointer-events', 'none')
.attr("marker-start", d => `url(#${d.from + "_" + d.to})`)
.attr("marker-end", d => `url(#arrow-${d.from + "_" + d.to})`)
},
linkUpdate: function (d, i, arr) {
d3.select(this)
.attr("stroke", d => d.data._upToTheRootHighlighted ? '#152785' : 'lightgray')
.attr("stroke-width", d => d.data._upToTheRootHighlighted ? 5 : 2)
if (d.data._upToTheRootHighlighted) {
d3.select(this).raise()
}
},
nodeUpdate: function (d, i, arr) {
d3.select(this)
.select('.node-rect')
.attr("stroke", d => d.data._highlighted || d.data._upToTheRootHighlighted ? '#152785' : 'none')
.attr("stroke-width", d.data._highlighted || d.data._upToTheRootHighlighted ? 10 : 1)
},
nodeWidth: d3Node => 250,
nodeHeight: d => 150,
siblingsMargin: d3Node => 20,
childrenMargin: d => 60,
neightbourMargin: (n1, n2) => 80,
compactMarginPair: d => 100,
compactMarginBetween: (d3Node => 20),
onNodeClick: (d) => d,
linkGroupArc: d3.linkHorizontal().x(d => d.x).y(d => d.y),
// ({ source, target }) => {
// return
// return `M ${source.x} , ${source.y} Q ${(source.x + target.x) / 2 + 100},${source.y-100} ${target.x}, ${target.y}`;
// },
nodeContent: d => `Sample Node(id=${d.id}), override using
chart
.nodeContent({data}=>{
return '' // Custom HTML
})
Or check different
layout examples
‹
` : `›
`,
"bottom": d => d ? `ˬ
` : `ˆ
`,
"right": d => d ? `›
` : `‹
`,
"top": d => d ? `ˆ
` : `ˬ
`,
}
return ` ${icons[state.layout](node.children)}
`
},
layoutBindings: {
"left": {
"nodeLeftX": node => 0,
"nodeRightX": node => node.width,
"nodeTopY": node => - node.height / 2,
"nodeBottomY": node => node.height / 2,
"nodeJoinX": node => node.x + node.width,
"nodeJoinY": node => node.y - node.height / 2,
"linkJoinX": node => node.x + node.width,
"linkJoinY": node => node.y,
"linkX": node => node.x,
"linkY": node => node.y,
"linkCompactXStart": node => node.x + node.width / 2,//node.x + (node.compactEven ? node.width / 2 : -node.width / 2),
"linkCompactYStart": node => node.y + (node.compactEven ? node.height / 2 : -node.height / 2),
"compactLinkMidX": (node, state) => node.firstCompactNode.x,// node.firstCompactNode.x + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"compactLinkMidY": (node, state) => node.firstCompactNode.y + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"linkParentX": node => node.parent.x + node.parent.width,
"linkParentY": node => node.parent.y,
"buttonX": node => node.width,
"buttonY": node => node.height / 2,
"centerTransform": ({ root, rootMargin, centerY, scale, centerX }) => `translate(${rootMargin},${centerY}) scale(${scale})`,
"compactDimension": {
sizeColumn: node => node.height,
sizeRow: node => node.width,
reverse: arr => arr.slice().reverse()
},
"nodeFlexSize": ({ height, width, siblingsMargin, childrenMargin, state, node }) => {
if (state.compact && node.flexCompactDim) {
const result = [node.flexCompactDim[0], node.flexCompactDim[1]]
return result;
};
return [height + siblingsMargin, width + childrenMargin]
},
"zoomTransform": ({ centerY, scale }) => `translate(${0},${centerY}) scale(${scale})`,
"diagonal": this.hdiagonal.bind(this),
"swap": d => { const x = d.x; d.x = d.y; d.y = x; },
"nodeUpdateTransform": ({ x, y, width, height }) => `translate(${x},${y - height / 2})`,
},
"top": {
"nodeLeftX": node => -node.width / 2,
"nodeRightX": node => node.width / 2,
"nodeTopY": node => 0,
"nodeBottomY": node => node.height,
"nodeJoinX": node => node.x - node.width / 2,
"nodeJoinY": node => node.y + node.height,
"linkJoinX": node => node.x,
"linkJoinY": node => node.y + node.height,
"linkCompactXStart": node => node.x + (node.compactEven ? node.width / 2 : -node.width / 2),
"linkCompactYStart": node => node.y + node.height / 2,
"compactLinkMidX": (node, state) => node.firstCompactNode.x + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"compactLinkMidY": node => node.firstCompactNode.y,
"compactDimension": {
sizeColumn: node => node.width,
sizeRow: node => node.height,
reverse: arr => arr,
},
"linkX": node => node.x,
"linkY": node => node.y,
"linkParentX": node => node.parent.x,
"linkParentY": node => node.parent.y + node.parent.height,
"buttonX": node => node.width / 2,
"buttonY": node => node.height,
"centerTransform": ({ root, rootMargin, centerY, scale, centerX }) => `translate(${centerX},${rootMargin}) scale(${scale})`,
"nodeFlexSize": ({ height, width, siblingsMargin, childrenMargin, state, node, compactViewIndex }) => {
if (state.compact && node.flexCompactDim) {
const result = [node.flexCompactDim[0], node.flexCompactDim[1]]
return result;
};
return [width + siblingsMargin, height + childrenMargin];
},
"zoomTransform": ({ centerX, scale }) => `translate(${centerX},0}) scale(${scale})`,
"diagonal": this.diagonal.bind(this),
"swap": d => { },
"nodeUpdateTransform": ({ x, y, width, height }) => `translate(${x - width / 2},${y})`,
},
"bottom": {
"nodeLeftX": node => -node.width / 2,
"nodeRightX": node => node.width / 2,
"nodeTopY": node => -node.height,
"nodeBottomY": node => 0,
"nodeJoinX": node => node.x - node.width / 2,
"nodeJoinY": node => node.y - node.height - node.height,
"linkJoinX": node => node.x,
"linkJoinY": node => node.y - node.height,
"linkCompactXStart": node => node.x + (node.compactEven ? node.width / 2 : -node.width / 2),
"linkCompactYStart": node => node.y - node.height / 2,
"compactLinkMidX": (node, state) => node.firstCompactNode.x + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"compactLinkMidY": node => node.firstCompactNode.y,
"linkX": node => node.x,
"linkY": node => node.y,
"compactDimension": {
sizeColumn: node => node.width,
sizeRow: node => node.height,
reverse: arr => arr,
},
"linkParentX": node => node.parent.x,
"linkParentY": node => node.parent.y - node.parent.height,
"buttonX": node => node.width / 2,
"buttonY": node => 0,
"centerTransform": ({ root, rootMargin, centerY, scale, centerX, chartHeight }) => `translate(${centerX},${chartHeight - rootMargin}) scale(${scale})`,
"nodeFlexSize": ({ height, width, siblingsMargin, childrenMargin, state, node }) => {
if (state.compact && node.flexCompactDim) {
const result = [node.flexCompactDim[0], node.flexCompactDim[1]]
return result;
};
return [width + siblingsMargin, height + childrenMargin]
},
"zoomTransform": ({ centerX, scale }) => `translate(${centerX},0}) scale(${scale})`,
"diagonal": this.diagonal.bind(this),
"swap": d => { d.y = -d.y; },
"nodeUpdateTransform": ({ x, y, width, height }) => `translate(${x - width / 2},${y - height})`,
},
"right": {
"nodeLeftX": node => -node.width,
"nodeRightX": node => 0,
"nodeTopY": node => - node.height / 2,
"nodeBottomY": node => node.height / 2,
"nodeJoinX": node => node.x - node.width - node.width,
"nodeJoinY": node => node.y - node.height / 2,
"linkJoinX": node => node.x - node.width,
"linkJoinY": node => node.y,
"linkX": node => node.x,
"linkY": node => node.y,
"linkParentX": node => node.parent.x - node.parent.width,
"linkParentY": node => node.parent.y,
"buttonX": node => 0,
"buttonY": node => node.height / 2,
"linkCompactXStart": node => node.x - node.width / 2,//node.x + (node.compactEven ? node.width / 2 : -node.width / 2),
"linkCompactYStart": node => node.y + (node.compactEven ? node.height / 2 : -node.height / 2),
"compactLinkMidX": (node, state) => node.firstCompactNode.x,// node.firstCompactNode.x + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"compactLinkMidY": (node, state) => node.firstCompactNode.y + node.firstCompactNode.flexCompactDim[0] / 4 + state.compactMarginPair(node) / 4,
"centerTransform": ({ root, rootMargin, centerY, scale, centerX, chartWidth }) => `translate(${chartWidth - rootMargin},${centerY}) scale(${scale})`,
"nodeFlexSize": ({ height, width, siblingsMargin, childrenMargin, state, node }) => {
if (state.compact && node.flexCompactDim) {
const result = [node.flexCompactDim[0], node.flexCompactDim[1]]
return result;
};
return [height + siblingsMargin, width + childrenMargin]
},
"compactDimension": {
sizeColumn: node => node.height,
sizeRow: node => node.width,
reverse: arr => arr.slice().reverse()
},
"zoomTransform": ({ centerY, scale }) => `translate(${0},${centerY}) scale(${scale})`,
"diagonal": this.hdiagonal.bind(this),
"swap": d => { const x = d.x; d.x = -d.y; d.y = x; },
"nodeUpdateTransform": ({ x, y, width, height }) => `translate(${x - width},${y - height / 2})`,
},
}
};
this.getChartState = () => attrs;
// Dynamically set getter and setter functions for Chart class
Object.keys(attrs).forEach((key) => {
//@ts-ignore
this[key] = function (_) {
if (!arguments.length) {
return attrs[key];
} else {
attrs[key] = _;
}
return this;
};
});
this.initializeEnterExitUpdatePattern();
}
initializeEnterExitUpdatePattern() {
d3.selection.prototype.patternify = function (params) {
var container = this;
var selector = params.selector;
var elementTag = params.tag;
var data = params.data || [selector];
// Pattern in action
var selection = container.selectAll("." + selector).data(data, (d, i) => {
if (typeof d === "object") {
if (d.id) { return d.id; }
}
return i;
});
selection.exit().remove();
selection = selection.enter().append(elementTag).merge(selection);
selection.attr("class", selector);
return selection;
};
}
// This method retrieves passed node's children IDs (including node)
getNodeChildren({ data, children, _children }, nodeStore) {
// Store current node ID
nodeStore.push(data);
// Loop over children and recursively store descendants id (expanded nodes)
if (children) {
children.forEach((d) => {
this.getNodeChildren(d, nodeStore);
});
}
// Loop over _children and recursively store descendants id (collapsed nodes)
if (_children) {
_children.forEach((d) => {
this.getNodeChildren(d, nodeStore);
});
}
// Return result
return nodeStore;
}
// This method can be invoked via chart.setZoomFactor API, it zooms to particulat scale
initialZoom(zoomLevel) {
const attrs = this.getChartState();
attrs.lastTransform.k = zoomLevel;
return this;
}
render() {
//InnerFunctions which will update visuals
const attrs = this.getChartState();
if (!attrs.data || attrs.data.length == 0) {
console.log('ORG CHART - Data is empty')
return this;
}
//Drawing containers
const container = d3.select(attrs.container);
const containerRect = container.node().getBoundingClientRect();
if (containerRect.width > 0) attrs.svgWidth = containerRect.width;
//Calculated properties
const calc = {
id: `ID${Math.floor(Math.random() * 1000000)}`, // id for event handlings,
chartWidth: attrs.svgWidth,
chartHeight: attrs.svgHeight
};
attrs.calc = calc;
// Calculate max node depth (it's needed for layout heights calculation)
calc.centerX = calc.chartWidth / 2;
calc.centerY = calc.chartHeight / 2;
// ******************* BEHAVIORS **********************
if (attrs.firstDraw) {
const behaviors = {
zoom: null
};
// Get zooming function
behaviors.zoom = d3.zoom().on("zoom", (event, d) => this.zoomed(event, d)).scaleExtent(attrs.scaleExtent)
attrs.zoomBehavior = behaviors.zoom;
}
//****************** ROOT node work ************************
attrs.flexTreeLayout = flextree({
nodeSize: node => {
const width = attrs.nodeWidth(node);;
const height = attrs.nodeHeight(node);
const siblingsMargin = attrs.siblingsMargin(node)
const childrenMargin = attrs.childrenMargin(node);
return attrs.layoutBindings[attrs.layout].nodeFlexSize({
state: attrs,
node: node,
width,
height,
siblingsMargin,
childrenMargin
});
}
})
.spacing((nodeA, nodeB) => nodeA.parent == nodeB.parent ? 0 : attrs.neightbourMargin(nodeA, nodeB));
this.setLayouts({ expandNodesFirst: false });
// ************************* DRAWING **************************
//Add svg
const svg = container
.patternify({
tag: "svg",
selector: "svg-chart-container"
})
.style('background-color', attrs.backgroundColor)
.attr("width", attrs.svgWidth)
.attr("height", attrs.svgHeight)
.attr("font-family", attrs.defaultFont)
if (attrs.firstDraw) {
svg.call(attrs.zoomBehavior)
.on("dblclick.zoom", null)
.attr("cursor", "move")
}
attrs.svg = svg;
//Add container g element
const chart = svg
.patternify({
tag: "g",
selector: "chart"
})
// Add one more container g element, for better positioning controls
attrs.centerG = chart
.patternify({
tag: "g",
selector: "center-group"
})
attrs.linksWrapper = attrs.centerG.patternify({
tag: "g",
selector: "links-wrapper"
})
attrs.nodesWrapper = attrs.centerG.patternify({
tag: "g",
selector: "nodes-wrapper"
})
attrs.connectionsWrapper = attrs.centerG.patternify({
tag: "g",
selector: "connections-wrapper"
})
attrs.defsWrapper = svg.patternify({
tag: "g",
selector: "defs-wrapper"
})
if (attrs.firstDraw) {
attrs.centerG.attr("transform", () => {
return attrs.layoutBindings[attrs.layout].centerTransform({
centerX: calc.centerX,
centerY: calc.centerY,
scale: attrs.lastTransform.k,
rootMargin: attrs.rootMargin,
root: attrs.root,
chartHeight: calc.chartHeight,
chartWidth: calc.chartWidth
})
});
}
attrs.chart = chart;
// Display tree contenrs
this.update(attrs.root);
//######################################### UTIL FUNCS ##################################
// This function restyles foreign object elements ()
d3.select(window).on(`resize.${attrs.id}`, () => {
const containerRect = d3.select(attrs.container).node().getBoundingClientRect();
attrs.svg.attr('width', containerRect.width)
});
if (attrs.firstDraw) {
attrs.firstDraw = false;
}
return this;
}
// This function can be invoked via chart.addNode API, and it adds node in tree at runtime
addNode(obj) {
const attrs = this.getChartState();
const nodeFound = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) === attrs.nodeId(obj))[0];
const parentFound = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) === attrs.parentNodeId(obj))[0];
if (nodeFound) {
console.log(`ORG CHART - ADD - Node with id "${attrs.nodeId(obj)}" already exists in tree`)
return this;
}
if (!parentFound) {
console.log(`ORG CHART - ADD - Parent node with id "${attrs.parentNodeId(obj)}" not found in the tree`)
return this;
}
if (obj._centered && !obj._expanded) obj._expanded = true;
attrs.data.push(obj);
// Update state of nodes and redraw graph
this.updateNodesState();
return this;
}
addAyncNode(obj) {
const attrs = this.getChartState();
const nodeFound = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) === attrs.nodeId(obj))[0];
const parentFound = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) === attrs.parentNodeId(obj))[0];
if (nodeFound) {
console.log(`ORG CHART - ADD - Node with id "${attrs.nodeId(obj)}" already exists in tree`)
return this;
}
if (!parentFound) {
console.log(`ORG CHART - ADD - Parent node with id "${attrs.parentNodeId(obj)}" not found in the tree`)
return this;
}
obj._expanded = true;
attrs.data.push(obj);
// Update state of nodes and redraw graph
this.updateNodesState();
return this;
}
// This function can be invoked via chart.removeNode API, and it removes node from tree at runtime
removeNode(nodeId) {
const attrs = this.getChartState();
const node = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) == nodeId)[0];
if (!node) {
console.log(`ORG CHART - REMOVE - Node with id "${nodeId}" not found in the tree`);
return this;
}
// Remove all node childs
// Retrieve all children nodes ids (including current node itself)
node.descendants()
.forEach(d => d.data._filteredOut = true)
const descendants = this.getNodeChildren(node, [], attrs.nodeId);
descendants.forEach(d => d._filtered = true)
// Filter out retrieved nodes and reassign data
attrs.data = attrs.data.filter(d => !d._filtered);
const updateNodesState = this.updateNodesState.bind(this);
// Update state of nodes and redraw graph
updateNodesState();
return this;
}
groupBy(array, accessor, aggegator) {
const grouped = {}
array.forEach(item => {
const key = accessor(item)
if (!grouped[key]) {
grouped[key] = []
}
grouped[key].push(item)
})
Object.keys(grouped).forEach(key => {
grouped[key] = aggegator(grouped[key])
})
return Object.entries(grouped);
}
calculateCompactFlexDimensions(root) {
const attrs = this.getChartState();
root.eachBefore(node => {
node.firstCompact = null;
node.compactEven = null;
node.flexCompactDim = null;
node.firstCompactNode = null;
})
root.eachBefore(node => {
if (node.children && node.children.length > 1) {
const compactChildren = node.children.filter(d => !d.children);
if (compactChildren.length < 2) return;
compactChildren.forEach((child, i) => {
if (!i) child.firstCompact = true;
if (i % 2) child.compactEven = false;
else child.compactEven = true;
child.row = Math.floor(i / 2);
})
const evenMaxColumnDimension = d3.max(compactChildren.filter(d => d.compactEven), attrs.layoutBindings[attrs.layout].compactDimension.sizeColumn);
const oddMaxColumnDimension = d3.max(compactChildren.filter(d => !d.compactEven), attrs.layoutBindings[attrs.layout].compactDimension.sizeColumn);
const columnSize = Math.max(evenMaxColumnDimension, oddMaxColumnDimension) * 2;
const rowsMapNew = this.groupBy(compactChildren, d => d.row, reducedGroup => d3.max(reducedGroup, d => attrs.layoutBindings[attrs.layout].compactDimension.sizeRow(d) + attrs.compactMarginBetween(d)));
const rowSize = d3.sum(rowsMapNew.map(v => v[1]))
compactChildren.forEach(node => {
node.firstCompactNode = compactChildren[0];
if (node.firstCompact) {
node.flexCompactDim = [
columnSize + attrs.compactMarginPair(node),
rowSize - attrs.compactMarginBetween(node)
];
} else {
node.flexCompactDim = [0, 0];
}
})
node.flexCompactDim = null;
}
})
}
calculateCompactFlexPositions(root) {
const attrs = this.getChartState();
root.eachBefore(node => {
if (node.children) {
const compactChildren = node.children.filter(d => d.flexCompactDim);
const fch = compactChildren[0];
if (!fch) return;
compactChildren.forEach((child, i, arr) => {
if (i == 0) fch.x -= fch.flexCompactDim[0] / 2;
if (i & i % 2 - 1) child.x = fch.x + fch.flexCompactDim[0] * 0.25 - attrs.compactMarginPair(child) / 4;
else if (i) child.x = fch.x + fch.flexCompactDim[0] * 0.75 + attrs.compactMarginPair(child) / 4;
})
const centerX = fch.x + fch.flexCompactDim[0] * 0.5;
fch.x = fch.x + fch.flexCompactDim[0] * 0.25 - attrs.compactMarginPair(fch) / 4;
const offsetX = node.x - centerX;
if (Math.abs(offsetX) < 10) {
compactChildren.forEach(d => d.x += offsetX);
}
const rowsMapNew = this.groupBy(compactChildren, d => d.row, reducedGroup => d3.max(reducedGroup, d => attrs.layoutBindings[attrs.layout].compactDimension.sizeRow(d)));
const cumSum = d3.cumsum(rowsMapNew.map(d => d[1] + attrs.compactMarginBetween(d)));
compactChildren
.forEach((node, i) => {
if (node.row) {
node.y = fch.y + cumSum[node.row - 1]
} else {
node.y = fch.y;
}
})
}
})
}
// This function basically redraws visible graph, based on nodes state
update({ x0, y0, x = 0, y = 0, width, height }) {
const attrs = this.getChartState();
const calc = attrs.calc;
if (attrs.compact) {
this.calculateCompactFlexDimensions(attrs.root);
}
// Assigns the x and y position for the nodes
const treeData = attrs.flexTreeLayout(attrs.root);
// Reassigns the x and y position for the based on the compact layout
if (attrs.compact) {
this.calculateCompactFlexPositions(attrs.root);
}
const nodes = treeData.descendants();
// console.table(nodes.map(d => ({ x: d.x, y: d.y, width: d.width, height: d.height, flexCompactDim: d.flexCompactDim + "" })))
// Get all links
const links = treeData.descendants().slice(1);
nodes.forEach(attrs.layoutBindings[attrs.layout].swap)
// Connections
const connections = attrs.connections;
const allNodesMap = {};
attrs.allNodes.forEach(d => allNodesMap[attrs.nodeId(d.data)] = d);
const visibleNodesMap = {}
nodes.forEach(d => visibleNodesMap[attrs.nodeId(d.data)] = d);
connections.forEach(connection => {
const source = allNodesMap[connection.from];
const target = allNodesMap[connection.to];
connection._source = source;
connection._target = target;
})
const visibleConnections = connections.filter(d => visibleNodesMap[d.from] && visibleNodesMap[d.to]);
const defsString = attrs.defs.bind(this)(attrs, visibleConnections);
const existingString = attrs.defsWrapper.html();
if (defsString !== existingString) {
attrs.defsWrapper.html(defsString)
}
// -------------------------- LINKS ----------------------
// Get links selection
const linkSelection = attrs.linksWrapper
.selectAll("path.link")
.data(links, (d) => attrs.nodeId(d.data));
// Enter any new links at the parent's previous position.
const linkEnter = linkSelection
.enter()
.insert("path", "g")
.attr("class", "link")
.attr("d", (d) => {
const xo = attrs.layoutBindings[attrs.layout].linkJoinX({ x: x0, y: y0, width, height });
const yo = attrs.layoutBindings[attrs.layout].linkJoinY({ x: x0, y: y0, width, height });
const o = { x: xo, y: yo };
return attrs.layoutBindings[attrs.layout].diagonal(o, o, o);
});
// Get links update selection
const linkUpdate = linkEnter.merge(linkSelection);
// Styling links
linkUpdate
.attr("fill", "none")
// Allow external modifications
linkUpdate.each(attrs.linkUpdate);
// Transition back to the parent element position
linkUpdate
.transition()
.duration(attrs.duration)
.attr("d", (d) => {
const n = attrs.compact && d.flexCompactDim ?
{
x: attrs.layoutBindings[attrs.layout].compactLinkMidX(d, attrs),
y: attrs.layoutBindings[attrs.layout].compactLinkMidY(d, attrs)
} :
{
x: attrs.layoutBindings[attrs.layout].linkX(d),
y: attrs.layoutBindings[attrs.layout].linkY(d)
};
const p = {
x: attrs.layoutBindings[attrs.layout].linkParentX(d),
y: attrs.layoutBindings[attrs.layout].linkParentY(d),
};
const m = attrs.compact && d.flexCompactDim ? {
x: attrs.layoutBindings[attrs.layout].linkCompactXStart(d),
y: attrs.layoutBindings[attrs.layout].linkCompactYStart(d),
} : n;
return attrs.layoutBindings[attrs.layout].diagonal(n, p, m);
});
// Remove any links which is exiting after animation
const linkExit = linkSelection
.exit()
.transition()
.duration(attrs.duration)
.attr("d", (d) => {
const xo = attrs.layoutBindings[attrs.layout].linkJoinX({ x, y, width, height });
const yo = attrs.layoutBindings[attrs.layout].linkJoinY({ x, y, width, height });
const o = { x: xo, y: yo };
return attrs.layoutBindings[attrs.layout].diagonal(o, o);
})
.remove();
// -------------------------- CONNECTIONS ----------------------
const connectionsSel = attrs.connectionsWrapper
.selectAll("path.connection")
.data(visibleConnections)
// Enter any new connections at the parent's previous position.
const connEnter = connectionsSel
.enter()
.insert("path", "g")
.attr("class", "connection")
.attr("d", (d) => {
const xo = attrs.layoutBindings[attrs.layout].linkJoinX({ x: x0, y: y0, width, height });
const yo = attrs.layoutBindings[attrs.layout].linkJoinY({ x: x0, y: y0, width, height });
const o = { x: xo, y: yo };
return attrs.layoutBindings[attrs.layout].diagonal(o, o);
});
// Get connections update selection
const connUpdate = connEnter.merge(connectionsSel);
// Styling connections
connUpdate.attr("fill", "none")
// Transition back to the parent element position
connUpdate
.transition()
.duration(attrs.duration)
.attr('d', (d) => {
const xs = attrs.layoutBindings[attrs.layout].linkX({ x: d._source.x, y: d._source.y, width: d._source.width, height: d._source.height });
const ys = attrs.layoutBindings[attrs.layout].linkY({ x: d._source.x, y: d._source.y, width: d._source.width, height: d._source.height });
const xt = attrs.layoutBindings[attrs.layout].linkJoinX({ x: d._target.x, y: d._target.y, width: d._target.width, height: d._target.height });
const yt = attrs.layoutBindings[attrs.layout].linkJoinY({ x: d._target.x, y: d._target.y, width: d._target.width, height: d._target.height });
return attrs.linkGroupArc({ source: { x: xs, y: ys }, target: { x: xt, y: yt } })
})
// Allow external modifications
connUpdate.each(attrs.connectionsUpdate);
// Remove any links which is exiting after animation
const connExit = connectionsSel
.exit()
.transition()
.duration(attrs.duration)
.attr('opacity', 0)
.remove();
// -------------------------- NODES ----------------------
// Get nodes selection
const nodesSelection = attrs.nodesWrapper
.selectAll("g.node")
.data(nodes, ({ data }) => attrs.nodeId(data));
// Enter any new nodes at the parent's previous position.
const nodeEnter = nodesSelection
.enter()
.append("g")
.attr("class", "node")
.attr("transform", (d) => {
if (d == attrs.root) return `translate(${x0},${y0})`
const xj = attrs.layoutBindings[attrs.layout].nodeJoinX({ x: x0, y: y0, width, height });
const yj = attrs.layoutBindings[attrs.layout].nodeJoinY({ x: x0, y: y0, width, height });
return `translate(${xj},${yj})`
})
.attr("cursor", "pointer")
.on("click", (event, { data }) => {
if ([...event.srcElement.classList].includes("node-button-foreign-object")) {
return;
}
attrs.onNodeClick(attrs.nodeId(data));
});
// Add background rectangle for the nodes
nodeEnter
.patternify({
tag: "rect",
selector: "node-rect",
data: (d) => [d]
})
// Node update styles
const nodeUpdate = nodeEnter
.merge(nodesSelection)
.style("font", "12px sans-serif");
// Add foreignObject element inside rectangle
const fo = nodeUpdate.patternify({
tag: "foreignObject",
selector: "node-foreign-object",
data: (d) => [d]
})
.style('overflow', 'visible')
// Add foreign object
fo.patternify({
tag: "xhtml:div",
selector: "node-foreign-object-div",
data: (d) => [d]
})
this.restyleForeignObjectElements();
// Add Node button circle's group (expand-collapse button)
const nodeButtonGroups = nodeEnter
.patternify({
tag: "g",
selector: "node-button-g",
data: (d) => [d]
})
.on("click", (event, d) => this.onButtonClick(event, d));
nodeButtonGroups.patternify({
tag: 'rect',
selector: 'node-button-rect',
data: (d) => [d]
})
.attr('opacity', 0)
.attr('pointer-events', 'all')
.attr('width', 40)
.attr('height', 40)
.attr('x', -20)
.attr('y', -20)
// Add expand collapse button content
const nodeFo = nodeButtonGroups
.patternify({
tag: "foreignObject",
selector: "node-button-foreign-object",
data: (d) => [d]
})
.attr('width', 40)
.attr('height', 40)
.attr('x', -20)
.attr('y', -20)
.style('overflow', 'visible')
.patternify({
tag: "xhtml:div",
selector: "node-button-div",
data: (d) => [d]
})
.style('pointer-events', 'none')
.style('display', 'flex')
.style('width', '100%')
.style('height', '100%')
// Transition to the proper position for the node
nodeUpdate
.transition()
.attr("opacity", 0)
.duration(attrs.duration)
.attr("transform", ({ x, y, width, height }) => {
return attrs.layoutBindings[attrs.layout].nodeUpdateTransform({ x, y, width, height });
})
.attr("opacity", 1);
// Style node rectangles
nodeUpdate
.select(".node-rect")
.attr("width", ({ width }) => width)
.attr("height", ({ height }) => height)
.attr("x", ({ width }) => 0)
.attr("y", ({ height }) => 0)
.attr("cursor", "pointer")
.attr('rx', 3)
.attr("fill", attrs.nodeDefaultBackground)
// Move node button group to the desired position
nodeUpdate
.select(".node-button-g")
.attr("transform", ({ data, width, height }) => {
const x = attrs.layoutBindings[attrs.layout].buttonX({ width, height });
const y = attrs.layoutBindings[attrs.layout].buttonY({ width, height });
return `translate(${x},${y})`
})
.attr("display", ({ data }) => {
return data._directSubordinates > 0 ? null : 'none';
})
.attr("opacity", ({ children, _children }) => {
if (children || _children) {
return 1;
}
return 0;
});
// Restyle node button circle
nodeUpdate
.select(".node-button-foreign-object .node-button-div")
.html((node) => {
return attrs.buttonContent({ node, state: attrs })
})
// Restyle button texts
nodeUpdate
.select(".node-button-text")
.attr("text-anchor", "middle")
.attr("alignment-baseline", "middle")
.attr("fill", attrs.defaultTextFill)
.attr("font-size", ({ children }) => {
if (children) return 40;
return 26;
})
.text(({ children }) => {
if (children) return "-";
return "+";
})
.attr("y", this.isEdge() ? 10 : 0);
nodeUpdate.each(attrs.nodeUpdate)
// Remove any exiting nodes after transition
const nodeExitTransition = nodesSelection
.exit()
.attr("opacity", 1)
.transition()
.duration(attrs.duration)
.attr("transform", (d) => {
const ex = attrs.layoutBindings[attrs.layout].nodeJoinX({ x, y, width, height });
const ey = attrs.layoutBindings[attrs.layout].nodeJoinY({ x, y, width, height });
return `translate(${ex},${ey})`
})
.on("end", function () {
d3.select(this).remove();
})
.attr("opacity", 0);
// Store the old positions for transition.
nodes.forEach((d) => {
d.x0 = d.x;
d.y0 = d.y;
});
// CHECK FOR CENTERING
const centeredNode = attrs.allNodes.filter(d => d.data._centered)[0]
if (centeredNode) {
const centeredNodes = centeredNode.data._centeredWithDescendants ? centeredNode.descendants().filter((d, i) => i < 7) : [centeredNode]
centeredNode.data._centeredWithDescendants = null;
centeredNode.data._centered = null;
this.fit({
animate: true,
scale: false,
nodes: centeredNodes
})
}
}
// This function detects whether current browser is edge
isEdge() {
return window.navigator.userAgent.includes("Edge");
}
// Generate horizontal diagonal - play with it here - https://observablehq.com/@bumbeishvili/curved-edges-horizontal-d3-v3-v4-v5-v6
hdiagonal(s, t, m) {
// Define source and target x,y coordinates
const x = s.x;
const y = s.y;
const ex = t.x;
const ey = t.y;
let mx = m && m.x || x;
let my = m && m.y || y;
// Values in case of top reversed and left reversed diagonals
let xrvs = ex - x < 0 ? -1 : 1;
let yrvs = ey - y < 0 ? -1 : 1;
// Define preferred curve radius
let rdef = 35;
// Reduce curve radius, if source-target x space is smaller
let r = Math.abs(ex - x) / 2 < rdef ? Math.abs(ex - x) / 2 : rdef;
// Further reduce curve radius, is y space is more small
r = Math.abs(ey - y) / 2 < r ? Math.abs(ey - y) / 2 : r;
// Defin width and height of link, excluding radius
let h = Math.abs(ey - y) / 2 - r;
let w = Math.abs(ex - x) / 2 - r;
// Build and return custom arc command
return `
M ${mx} ${my}
L ${mx} ${y}
L ${x} ${y}
L ${x + w * xrvs} ${y}
C ${x + w * xrvs + r * xrvs} ${y}
${x + w * xrvs + r * xrvs} ${y}
${x + w * xrvs + r * xrvs} ${y + r * yrvs}
L ${x + w * xrvs + r * xrvs} ${ey - r * yrvs}
C ${x + w * xrvs + r * xrvs} ${ey}
${x + w * xrvs + r * xrvs} ${ey}
${ex - w * xrvs} ${ey}
L ${ex} ${ey}
`;
}
// Generate custom diagonal - play with it here - https://observablehq.com/@bumbeishvili/curved-edges
diagonal(s, t, m) {
const x = s.x;
const y = s.y;
const ex = t.x;
const ey = t.y;
let mx = m && m.x || x;
let my = m && m.y || y;
let xrvs = ex - x < 0 ? -1 : 1;
let yrvs = ey - y < 0 ? -1 : 1;
let rdef = 35;
let r = Math.abs(ex - x) / 2 < rdef ? Math.abs(ex - x) / 2 : rdef;
r = Math.abs(ey - y) / 2 < r ? Math.abs(ey - y) / 2 : r;
let h = Math.abs(ey - y) / 2 - r;
let w = Math.abs(ex - x) - r * 2;
//w=0;
const path = `
M ${mx} ${my}
L ${x} ${my}
L ${x} ${y}
L ${x} ${y + h * yrvs}
C ${x} ${y + h * yrvs + r * yrvs} ${x} ${y + h * yrvs + r * yrvs
} ${x + r * xrvs} ${y + h * yrvs + r * yrvs}
L ${x + w * xrvs + r * xrvs} ${y + h * yrvs + r * yrvs}
C ${ex} ${y + h * yrvs + r * yrvs} ${ex} ${y + h * yrvs + r * yrvs
} ${ex} ${ey - h * yrvs}
L ${ex} ${ey}
`;
return path;
}
restyleForeignObjectElements() {
const attrs = this.getChartState();
attrs.svg
.selectAll(".node-foreign-object")
.attr("width", ({ width }) => width)
.attr("height", ({ height }) => height)
.attr("x", ({ width }) => 0)
.attr("y", ({ height }) => 0);
attrs.svg
.selectAll(".node-foreign-object-div")
.style("width", ({ width }) => `${width}px`)
.style("height", ({ height }) => `${height}px`)
.html(function (d, i, arr) { return attrs.nodeContent.bind(this)(d, i, arr, attrs) })
}
// Toggle children on click.
onButtonClick(event, d) {
const attrs = this.getChartState();
if (attrs.setActiveNodeCentered) {
d.data._centered = true;
d.data._centeredWithDescendants = true;
}
// If childrens are expanded
if (d.children) {
//Collapse them
d._children = d.children;
d.children = null;
// Set descendants expanded property to false
this.setExpansionFlagToChildren(d, false);
} else {
// Expand children
d.children = d._children;
d._children = null;
// Set each children as expanded
if (d.children) {
d.children.forEach(({ data }) => (data._expanded = true));
}
}
// Redraw Graph
this.update(d);
}
// This function changes `expanded` property to descendants
setExpansionFlagToChildren({ data, children, _children }, flag) {
// Set flag to the current property
data._expanded = flag;
// Loop over and recursively update expanded children's descendants
if (children) {
children.forEach((d) => {
this.setExpansionFlagToChildren(d, flag);
});
}
// Loop over and recursively update collapsed children's descendants
if (_children) {
_children.forEach((d) => {
this.setExpansionFlagToChildren(d, flag);
});
}
}
// Method which only expands nodes, which have property set "expanded=true"
expandSomeNodes(d) {
// If node has expanded property set
if (d.data._expanded) {
// Retrieve node's parent
let parent = d.parent;
// While we can go up
while (parent) {
// Expand all current parent's children
if (parent._children) {
parent.children = parent._children;
}
// Replace current parent holding object
parent = parent.parent;
}
}
// Recursivelly do the same for collapsed nodes
if (d._children) {
d._children.forEach((ch) => this.expandSomeNodes(ch));
}
// Recursivelly do the same for expanded nodes
if (d.children) {
d.children.forEach((ch) => this.expandSomeNodes(ch));
}
}
// This function updates nodes state and redraws graph, usually after data change
updateNodesState() {
const attrs = this.getChartState();
this.setLayouts({ expandNodesFirst: true });
// Redraw Graphs
this.update(attrs.root);
}
setLayouts({ expandNodesFirst = true }) {
const attrs = this.getChartState();
// Store new root by converting flat data to hierarchy
attrs.root = d3
.stratify()
.id((d) => attrs.nodeId(d))
.parentId(d => attrs.parentNodeId(d))(attrs.data);
attrs.root.each((node, i, arr) => {
let width = attrs.nodeWidth(node);
let height = attrs.nodeHeight(node);
Object.assign(node, { width, height })
})
// Store positions, where children appear during their enter animation
attrs.root.x0 = 0;
attrs.root.y0 = 0;
attrs.allNodes = attrs.root.descendants();
// Store direct and total descendants count
attrs.allNodes.forEach((d) => {
Object.assign(d.data, {
_directSubordinates: d.children ? d.children.length : 0,
_totalSubordinates: d.descendants().length - 1
});
});
if (attrs.root.children) {
if (expandNodesFirst) {
// Expand all nodes first
attrs.root.children.forEach(this.expand)
attrs.root.children.forEach(item => {
item.children.forEach(this.expand)
})
}
// Then collapse them all
attrs.root.children.forEach((d) => this.collapse(d));
// Collapse root if level is 0
if (attrs.expandLevel == 0) {
attrs.root._children = attrs.root.children;
attrs.root.children = null;
}
// Then only expand nodes, which have expanded proprty set to true
[attrs.root].forEach((ch) => this.expandSomeNodes(ch));
}
}
// Function which collapses passed node and it's descendants
collapse(d) {
if (d.children) {
d._children = d.children;
d._children.forEach((ch) => this.collapse(ch));
d.children = null;
}
}
// Function which expands passed node and it's descendants
expand(d) {
if (d._children) {
d.children = d._children;
d.children.forEach((ch) => this.expand(ch));
d._children = null;
}
}
// Zoom handler function
zoomed(event, d) {
const attrs = this.getChartState();
const chart = attrs.chart;
// Get d3 event's transform object
const transform = event.transform;
// Store it
attrs.lastTransform = transform;
// Reposition and rescale chart accordingly
chart.attr("transform", transform);
// Apply new styles to the foreign object element
if (this.isEdge()) {
this.restyleForeignObjectElements();
}
}
zoomTreeBounds({ x0, x1, y0, y1, params = { animate: true, scale: true } }) {
const { centerG, svgWidth: w, svgHeight: h, svg, zoomBehavior, duration, lastTransform } = this.getChartState()
let scaleVal = Math.min(8, 0.9 / Math.max((x1 - x0) / w, (y1 - y0) / h));
let identity = d3.zoomIdentity.translate(w / 2, h / 2)
identity = identity.scale(params.scale ? scaleVal : lastTransform.k)
identity = identity.translate(-(x0 + x1) / 2, -(y0 + y1) / 2);
// Transition zoom wrapper component into specified bounds
svg.transition().duration(params.animate ? duration : 0).call(zoomBehavior.transform, identity);
centerG.transition().duration(params.animate ? duration : 0).attr('transform', 'translate(0,0)')
}
fit({ animate = true, nodes, scale = true } = {}) {
const attrs = this.getChartState();
const { root } = attrs;
let descendants = nodes ? nodes : root.descendants();
const minX = d3.min(descendants, d => d.x + attrs.layoutBindings[attrs.layout].nodeLeftX(d))
const maxX = d3.max(descendants, d => d.x + attrs.layoutBindings[attrs.layout].nodeRightX(d))
const minY = d3.min(descendants, d => d.y + attrs.layoutBindings[attrs.layout].nodeTopY(d))
const maxY = d3.max(descendants, d => d.y + attrs.layoutBindings[attrs.layout].nodeBottomY(d))
this.zoomTreeBounds({
params: { animate: animate, scale },
x0: minX - 50,
x1: maxX + 50,
y0: minY - 50,
y1: maxY + 50,
});
return this;
}
// This function can be invoked via chart.setExpanded API, it expands or collapses particular node
setExpanded(id, expandedFlag = true) {
const attrs = this.getChartState();
// Retrieve node by node Id
const node = attrs.allNodes.filter(({ data }) => attrs.nodeId(data) == id)[0];
if (!node) {
console.log(`ORG CHART - ${expandedFlag ? "EXPAND" : "COLLAPSE"} - Node with id (${id}) not found in the tree`)
return this;
}
node.data._expanded = expandedFlag;
return this;
}
setCentered(nodeId) {
const attrs = this.getChartState();
// this.setExpanded(nodeId)
const node = attrs.allNodes.filter(d => attrs.nodeId(d.data) === nodeId)[0];
if (!node) {
console.log(`ORG CHART - CENTER - Node with id (${nodeId}) not found in the tree`)
return this;
}
node.data._centered = true;
node.data._expanded = true;
return this;
}
setHighlighted(nodeId) {
const attrs = this.getChartState();
const node = attrs.allNodes.filter(d => attrs.nodeId(d.data) === nodeId)[0];
if (!node) {
console.log(`ORG CHART - HIGHLIGHT - Node with id (${nodeId}) not found in the tree`);
return this
}
node.data._highlighted = true;
node.data._expanded = true;
node.data._centered = true;
return this;
}
setUpToTheRootHighlighted(nodeId) {
const attrs = this.getChartState();
const node = attrs.allNodes.filter(d => attrs.nodeId(d.data) === nodeId)[0];
if (!node) {
console.log(`ORG CHART - HIGHLIGHTROOT - Node with id (${nodeId}) not found in the tree`)
return this;
}
node.data._upToTheRootHighlighted = true;
node.data._expanded = true;
node.ancestors().forEach(d => d.data._upToTheRootHighlighted = true)
return this;
}
clearHighlighting() {
const attrs = this.getChartState();
attrs.allNodes.forEach(d => {
d.data._highlighted = false;
d.data._upToTheRootHighlighted = false;
})
this.update(attrs.root)
}
// It can take selector which would go fullscreen
fullscreen(elem) {
const attrs = this.getChartState();
const el = d3.select(elem || attrs.container).node();
d3.select(document).on('fullscreenchange.' + attrs.id, function (d) {
const fsElement = document.fullscreenElement || document.mozFullscreenElement || document.webkitFullscreenElement;
if (fsElement == el) {
setTimeout(d => {
attrs.svg.attr('height', window.innerHeight - 40);
}, 500)
} else {
attrs.svg.attr('height', attrs.svgHeight)
}
})
if (el.requestFullscreen) {
el.requestFullscreen();
} else if (el.mozRequestFullScreen) {
el.mozRequestFullScreen();
} else if (el.webkitRequestFullscreen) {
el.webkitRequestFullscreen();
} else if (el.msRequestFullscreen) {
el.msRequestFullscreen();
}
}
// Zoom in exposed method
zoomIn() {
const { svg, zoomBehavior } = this.getChartState();
svg.transition().call(zoomBehavior.scaleBy, 1.3);
}
// Zoom out exposed method
zoomOut() {
const { svg, zoomBehavior } = this.getChartState();
svg.transition().call(zoomBehavior.scaleBy, 0.78);
}
toDataURL(url, callback) {
var xhr = new XMLHttpRequest();
xhr.onload = function () {
var reader = new FileReader();
reader.onloadend = function () {
callback(reader.result);
}
reader.readAsDataURL(xhr.response);
};
xhr.open('GET', url);
xhr.responseType = 'blob';
xhr.send();
}
exportImg({ full = false, scale = 3, onLoad = d => d, save = true } = {}) {
const that = this;
const attrs = this.getChartState();
const { svg: svgImg, root } = attrs
let count = 0;
const selection = svgImg.selectAll('img')
let total = selection.size()
const exportImage = () => {
const transform = JSON.parse(JSON.stringify(that.lastTransform()));
const duration = that.duration();
if (full) {
that.fit();
}
const { svg } = that.getChartState()
setTimeout(d => {
that.downloadImage({
node: svg.node(), scale, isSvg: false,
onAlreadySerialized: d => {
that.update(root)
},
onLoad: onLoad,
save
})
}, full ? duration + 10 : 0)
}
if (total > 0) {
selection
.each(function () {
that.toDataURL(this.src, (dataUrl) => {
this.src = dataUrl;
if (++count == total) {
exportImage();
}
})
})
} else {
exportImage();
}
}
exportSvg() {
const { svg } = this.getChartState();
this.downloadImage({ node: svg.node(), scale: 3, isSvg: true })
return this;
}
expandAll() {
const { allNodes, root } = this.getChartState();
allNodes.forEach(d => d.data._expanded = true);
this.render()
return this;
}
expandExpandNodes() {
const { allNodes, root } = this.getChartState();
// allNodes.forEach(d => d.data._expanded = true);
allNodes.forEach(d => d.data._expanded = d.data.expand === "1" ? true : false);
this.render()
return this;
}
collapseAll() {
const { allNodes, root } = this.getChartState();
allNodes.forEach(d => d.data._expanded = false);
this.expandLevel(0)
this.render();
return this;
}
downloadImage({ node, scale = 2, isSvg = false, save = true, onAlreadySerialized = d => { }, onLoad = d => { } }) {
// Retrieve svg node
const svgNode = node;
if (isSvg) {
let source = serializeString(svgNode);
//add xml declaration
source = '\r\n' + source;
//convert svg source to URI data scheme.
var url = "data:image/svg+xml;charset=utf-8," + encodeURIComponent(source);
saveAs(url, "graph.svg");
onAlreadySerialized()
return;
}
// Get image quality index (basically, index you can zoom in)
const quality = scale
// Create image
const image = document.createElement('img');
image.onload = function () {
// Create image canvas
const canvas = document.createElement('canvas');
// Set width and height based on SVG node
const rect = svgNode.getBoundingClientRect();
canvas.width = rect.width * quality;
canvas.height = rect.height * quality;
// Draw background
const context = canvas.getContext('2d');
context.fillStyle = '#FAFAFA';
context.fillRect(0, 0, rect.width * quality, rect.height * quality);
context.drawImage(image, 0, 0, rect.width * quality, rect.height * quality);
// Set some image metadata
let dt = canvas.toDataURL('image/png');
if (onLoad) {
onLoad(dt)
}
if (save) {
// Invoke saving function
saveAs(dt, 'graph.png');
}
};
var url = 'data:image/svg+xml; charset=utf8, ' + encodeURIComponent(serializeString(svgNode));
onAlreadySerialized()
image.src = url// URL.createObjectURL(blob);
// This function invokes save window
function saveAs(uri, filename) {
// create link
var link = document.createElement('a');
if (typeof link.download === 'string') {
document.body.appendChild(link); // Firefox requires the link to be in the body
link.download = filename;
link.href = uri;
link.click();
document.body.removeChild(link); // remove the link when done
} else {
location.replace(uri);
}
}
// This function serializes SVG and sets all necessary attributes
function serializeString(svg) {
const xmlns = 'http://www.w3.org/2000/xmlns/';
const xlinkns = 'http://www.w3.org/1999/xlink';
const svgns = 'http://www.w3.org/2000/svg';
svg = svg.cloneNode(true);
const fragment = window.location.href + '#';
const walker = document.createTreeWalker(svg, NodeFilter.SHOW_ELEMENT, null, false);
while (walker.nextNode()) {
for (const attr of walker.currentNode.attributes) {
if (attr.value.includes(fragment)) {
attr.value = attr.value.replace(fragment, '#');
}
}
}
svg.setAttributeNS(xmlns, 'xmlns', svgns);
svg.setAttributeNS(xmlns, 'xmlns:xlink', xlinkns);
const serializer = new XMLSerializer();
const string = serializer.serializeToString(svg);
return string;
}
}
// Calculate what size text will take
getTextWidth(text, {
fontSize = 14,
fontWeight = 400,
defaultFont = "Helvetice",
ctx
} = {}) {
ctx.font = `${fontWeight || ''} ${fontSize}px ${defaultFont} `
const measurement = ctx.measureText(text);
return measurement.width;
}
}