element provides an accessible, short-text description of any SVG container element or graphics element. //Text in a <title> element is not rendered as part of the graphic, but browsers usually display it as a tooltip. link.append("title") .text(d => d.type); const edgepaths = svg.selectAll(".edgepath") //make path go along with the link provide position for link labels .data(dataset.links) .enter() .append('path') .attr('class', 'edgepath') .attr('fill-opacity', 0) .attr('stroke-opacity', 0) .attr('id', function (d, i) {return 'edgepath' + i}) .style("pointer-events", "none"); const edgelabels = svg.selectAll(".edgelabel") .data(dataset.links) .enter() .append('text') .style("pointer-events", "none") .attr('class', 'edgelabel') .attr('id', function (d, i) {return 'edgelabel' + i}) .attr('font-size', 10) .attr('fill', '#aaa'); edgelabels.append('textPath') //To render text along the shape of a <path>, enclose the text in a <textPath> element that has an href attribute with a reference to the <path> element. .attr('xlink:href', function (d, i) {return '#edgepath' + i}) .style("text-anchor", "middle") .style("pointer-events", "none") .attr("startOffset", "50%") .text(d => d.type); // Initialize the nodes const node = svg.selectAll(".nodes") .data(dataset.nodes) .enter() .append("g") .attr("class", "nodes") .call(d3.drag() //sets the event listener for the specified typenames and returns the drag behavior. .on("start", dragstarted) //start - after a new pointer becomes active (on mousedown or touchstart). .on("drag", dragged) //drag - after an active pointer moves (on mousemove or touchmove). ); node.append("circle") .attr("r", d=> circleSize) .style("stroke", "grey") .style("stroke-width", d => 1) .style("fill", d => colorScale(d.group)) node.append("title") .text(d => d.id + ": " + d.name + " - " + d.group); node.append("text") .attr("dy", 4) .text(d => d.name) .style("text-anchor", "middle"); //Listen for tick events to render the nodes as they update in your Canvas or SVG. simulation .nodes(dataset.nodes) .on("tick", ticked); simulation.force("link") .links(dataset.links); // This function is run at each iteration of the force algorithm, updating the nodes position (the nodes data array is directly manipulated). function ticked() { link.attr("x1", d => d.source.x) .attr("y1", d => d.source.y) .attr("x2", d => d.target.x) .attr("y2", d => d.target.y); node.attr("transform", d => `translate(${d.x},${d.y})`); edgepaths.attr('d', d => 'M ' + d.source.x + ' ' + d.source.y + ' L ' + d.target.x + ' ' + d.target.y); } //When the drag gesture starts, the targeted node is fixed to the pointer //The simulation is temporarily “heated” during interaction by setting the target alpha to a non-zero value. function dragstarted(d) { if (!d3.event.active) simulation.alphaTarget(0.3).restart();//sets the current target alpha to the specified number in the range [0,1]. d.fy = d.y; //fx - the node’s fixed x-position. Original is null. d.fx = d.x; //fy - the node’s fixed y-position. Original is null. } //When the drag gesture starts, the targeted node is fixed to the pointer function dragged(d) { d.fx = d3.event.x; d.fy = d3.event.y; } //drawing the legend const legend_g = svg.selectAll(".legend") .data(colorScale.domain()) .enter().append("g") .attr("transform", (d, i) => `translate(${width},${i * 20})`); legend_g.append("circle") .attr("cx", 0) .attr("cy", 0) .attr("r", 5) .attr("fill", colorScale); legend_g.append("text") .attr("x", 10) .attr("y", 5) .text(d => d); return div }</article></body></html>

myChart={ const circleSize = 30; const div = html`

`; const svg = d3.select(div) .append("svg") .attr("width", width + margin.left + margin.right) .attr("height", height + margin.top + margin.bottom) .append("g") .attr("transform", `translate(${margin.left},${margin.top})`); //appending little triangles, path object, as arrowhead //The element is used to store graphical objects that will be used at a later time //The element defines the graphic that is to be used for drawing arrowheads or polymarkers on a given , , or element. svg.append('defs').append('marker') .attr("id",'arrowhead') .attr('viewBox','-0 -5 10 10') //the bound of the SVG viewport for the current SVG fragment. defines a coordinate system 10 wide and 10 high starting on (0,-5) .attr('refX',circleSize) // x coordinate for the reference point of the marker. If circle is bigger, this need to be bigger. .attr('refY',0) .attr('orient','auto') .attr('markerWidth',13) .attr('markerHeight',13) .attr('xoverflow','visible') .append('svg:path') .attr('d', 'M 0,-5 L 10 ,0 L 0,5') .attr('fill', '#999') .style('stroke','none'); //create some data const dataset = { nodes: [ {id: 1, name: 'ville', group: 'Lieu'}, {id: 2, name: 'train', group: 'Lieu'}, {id: 3, name: 'objet trouvé', group: 'Objet'}, {id: 4, name: 'objet perdu', group: 'Objet'}, {id: 5, name: 'voyageur', group: 'Personne'}, {id: 6, name: 'personne', group: 'Personne'}, {id: 7, name: 'gare', group: 'Lieu'}, {id: 8, name: 'agent sncf', group: 'Personne'}, {id: 9, name: 'objet', group: 'Objet'} ], links: [ {source: 5, target: 6, type: 'est'}, {source: 8, target: 6, type: 'est'}, {source: 7, target: 1, type: 'située dans'}, {source: 2, target: 7, type: 'part/arrive d\'une'}, {source: 9, target: 5, type: 'appartient à un'}, {source: 8, target: 3, type: 'recense / restitue'}, {source: 6, target: 4, type: 'trouve'}, {source: 4, target: 3, type: 'devient'}, {source: 5, target: 4, type: 'déclare'}, {source: 3, target: 7, type: 'trouvé dans'}, {source: 3, target: 2, type: 'trouvé dans'}, {source: 4, target: 7, type: 'perdu dans'}, {source: 4, target: 2, type: 'perdu dans'}, {source: 3, target: 9, type: 'est'}, {source: 4, target: 9, type: 'est'} ] }; console.log("dataset is ...",dataset); // Initialize the links const link = svg.selectAll(".links") .data(dataset.links) .enter() .append("line") .attr("class", "links") .attr('marker-end','url(#arrowhead)') //The marker-end attribute defines the arrowhead or polymarker that will be drawn at the final vertex of the given shape. //The element provides an accessible, short-text description of any SVG container element or graphics element. //Text in a <title> element is not rendered as part of the graphic, but browsers usually display it as a tooltip. link.append("title") .text(d => d.type); const edgepaths = svg.selectAll(".edgepath") //make path go along with the link provide position for link labels .data(dataset.links) .enter() .append('path') .attr('class', 'edgepath') .attr('fill-opacity', 0) .attr('stroke-opacity', 0) .attr('id', function (d, i) {return 'edgepath' + i}) .style("pointer-events", "none"); const edgelabels = svg.selectAll(".edgelabel") .data(dataset.links) .enter() .append('text') .style("pointer-events", "none") .attr('class', 'edgelabel') .attr('id', function (d, i) {return 'edgelabel' + i}) .attr('font-size', 10) .attr('fill', '#aaa'); edgelabels.append('textPath') //To render text along the shape of a <path>, enclose the text in a <textPath> element that has an href attribute with a reference to the <path> element. .attr('xlink:href', function (d, i) {return '#edgepath' + i}) .style("text-anchor", "middle") .style("pointer-events", "none") .attr("startOffset", "50%") .text(d => d.type); // Initialize the nodes const node = svg.selectAll(".nodes") .data(dataset.nodes) .enter() .append("g") .attr("class", "nodes") .call(d3.drag() //sets the event listener for the specified typenames and returns the drag behavior. .on("start", dragstarted) //start - after a new pointer becomes active (on mousedown or touchstart). .on("drag", dragged) //drag - after an active pointer moves (on mousemove or touchmove). ); node.append("circle") .attr("r", d=> circleSize) .style("stroke", "grey") .style("stroke-width", d => 1) .style("fill", d => colorScale(d.group)) node.append("title") .text(d => d.id + ": " + d.name + " - " + d.group); node.append("text") .attr("dy", 4) .text(d => d.name) .style("text-anchor", "middle"); //Listen for tick events to render the nodes as they update in your Canvas or SVG. simulation .nodes(dataset.nodes) .on("tick", ticked); simulation.force("link") .links(dataset.links); // This function is run at each iteration of the force algorithm, updating the nodes position (the nodes data array is directly manipulated). function ticked() { link.attr("x1", d => d.source.x) .attr("y1", d => d.source.y) .attr("x2", d => d.target.x) .attr("y2", d => d.target.y); node.attr("transform", d => `translate(${d.x},${d.y})`); edgepaths.attr('d', d => 'M ' + d.source.x + ' ' + d.source.y + ' L ' + d.target.x + ' ' + d.target.y); } //When the drag gesture starts, the targeted node is fixed to the pointer //The simulation is temporarily “heated” during interaction by setting the target alpha to a non-zero value. function dragstarted(d) { if (!d3.event.active) simulation.alphaTarget(0.3).restart();//sets the current target alpha to the specified number in the range [0,1]. d.fy = d.y; //fx - the node’s fixed x-position. Original is null. d.fx = d.x; //fy - the node’s fixed y-position. Original is null. } //When the drag gesture starts, the targeted node is fixed to the pointer function dragged(d) { d.fx = d3.event.x; d.fy = d3.event.y; } //drawing the legend const legend_g = svg.selectAll(".legend") .data(colorScale.domain()) .enter().append("g") .attr("transform", (d, i) => `translate(${width},${i * 20})`); legend_g.append("circle") .attr("cx", 0) .attr("cy", 0) .attr("r", 5) .attr("fill", colorScale); legend_g.append("text") .attr("x", 10) .attr("y", 5) .text(d => d); return div }</article></body></html>