puzzler10/README.md

## README.md

      
    Raw
  

              README.md
            
          
    Sticky nodes - they stay where they are dragged.
Read more about it here

  
## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>
.links line {
  stroke: #999;
  stroke-opacity: 0.6;
}
.nodes circle {
  stroke: #fff;
  stroke-width: 1.5px;
}
</style>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>
//create somewhere to put the force directed graph
var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");


var nodes_data =  [
    {"name": "Travis", "sex": "M"},
    {"name": "Rake", "sex": "M"},
    {"name": "Diana", "sex": "F"},
    {"name": "Rachel", "sex": "F"},
    {"name": "Shawn", "sex": "M"},
    {"name": "Emerald", "sex": "F"}
    ]
var links_data = [
	{"source": "Travis", "target": "Rake"},
    {"source": "Diana", "target": "Rake"},
    {"source": "Diana", "target": "Rachel"},
    {"source": "Rachel", "target": "Rake"},
    {"source": "Rachel", "target": "Shawn"},
    {"source": "Emerald", "target": "Rachel"}
]
//set up the simulation
var simulation = d3.forceSimulation()
					//add nodes
					.nodes(nodes_data);


//add forces
//we're going to add a charge to each node
//also going to add a centering force
//and a link force
var link_force =  d3.forceLink(links_data)
                        .id(function(d) { return d.name; });
simulation
    .force("charge_force", d3.forceManyBody())
    .force("center_force", d3.forceCenter(width / 2, height / 2))
    .force("links",link_force);

//add tick instructions:
simulation.on("tick", tickActions );
//draw circles for the links
var node = svg.append("g")
        .attr("class", "nodes")
        .selectAll("circle")
        .data(nodes_data)
        .enter()
        .append("circle")
        .attr("r", 10)
        .attr("fill", "red");
//draw lines for the links
var link = svg.append("g")
      .attr("class", "links")
    .selectAll("line")
    .data(links_data)
    .enter().append("line")
      .attr("stroke-width", 2);


var drag_handler = d3.drag()
	.on("start", drag_start)
	.on("drag", drag_drag)
	.on("end", drag_end);

//same as using .call on the node variable as in https://bl.ocks.org/mbostock/4062045
drag_handler(node)
//drag handler
//d is the node
function drag_start(d) {
 if (!d3.event.active) simulation.alphaTarget(0.3	).restart();
   d.fx = d.x;
   d.fy = d.y;
}
function drag_drag(d) {
  d.fx = d3.event.x;
  d.fy = d3.event.y;
}
function drag_end(d) {
  if (!d3.event.active) simulation.alphaTarget(0);
  d.fx = d.x;
  d.fy = d.y;
}

function tickActions() {
    //update circle positions each tick of the simulation
    node
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });

    //update link positions
    //simply tells one end of the line to follow one node around
    //and the other end of the line to follow the other node around
    link
        .attr("x1", function(d) { return d.source.x; })
        .attr("y1", function(d) { return d.source.y; })
        .attr("x2", function(d) { return d.target.x; })
        .attr("y2", function(d) { return d.target.y; });
}
</script>
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>
	.links line {
	stroke: #999;
	stroke-opacity: 0.6;
	}
	.nodes circle {
	stroke: #fff;
	stroke-width: 1.5px;
	}
	</style>
	<svg width="960" height="600"></svg>
	<script src="https://d3js.org/d3.v4.min.js"></script>
	<script>
	//create somewhere to put the force directed graph
	var svg = d3.select("svg"),
	width = +svg.attr("width"),
	height = +svg.attr("height");


	var nodes_data = [
	{"name": "Travis", "sex": "M"},
	{"name": "Rake", "sex": "M"},
	{"name": "Diana", "sex": "F"},
	{"name": "Rachel", "sex": "F"},
	{"name": "Shawn", "sex": "M"},
	{"name": "Emerald", "sex": "F"}
	]
	var links_data = [
	{"source": "Travis", "target": "Rake"},
	{"source": "Diana", "target": "Rake"},
	{"source": "Diana", "target": "Rachel"},
	{"source": "Rachel", "target": "Rake"},
	{"source": "Rachel", "target": "Shawn"},
	{"source": "Emerald", "target": "Rachel"}
	]
	//set up the simulation
	var simulation = d3.forceSimulation()
	//add nodes
	.nodes(nodes_data);


	//add forces
	//we're going to add a charge to each node
	//also going to add a centering force
	//and a link force
	var link_force = d3.forceLink(links_data)
	.id(function(d) { return d.name; });
	simulation
	.force("charge_force", d3.forceManyBody())
	.force("center_force", d3.forceCenter(width / 2, height / 2))
	.force("links",link_force);

	//add tick instructions:
	simulation.on("tick", tickActions );
	//draw circles for the links
	var node = svg.append("g")
	.attr("class", "nodes")
	.selectAll("circle")
	.data(nodes_data)
	.enter()
	.append("circle")
	.attr("r", 10)
	.attr("fill", "red");
	//draw lines for the links
	var link = svg.append("g")
	.attr("class", "links")
	.selectAll("line")
	.data(links_data)
	.enter().append("line")
	.attr("stroke-width", 2);


	var drag_handler = d3.drag()
	.on("start", drag_start)
	.on("drag", drag_drag)
	.on("end", drag_end);

	//same as using .call on the node variable as in https://bl.ocks.org/mbostock/4062045
	drag_handler(node)
	//drag handler
	//d is the node
	function drag_start(d) {
	if (!d3.event.active) simulation.alphaTarget(0.3 ).restart();
	d.fx = d.x;
	d.fy = d.y;
	}
	function drag_drag(d) {
	d.fx = d3.event.x;
	d.fy = d3.event.y;
	}
	function drag_end(d) {
	if (!d3.event.active) simulation.alphaTarget(0);
	d.fx = d.x;
	d.fy = d.y;
	}

	function tickActions() {
	//update circle positions each tick of the simulation
	node
	.attr("cx", function(d) { return d.x; })
	.attr("cy", function(d) { return d.y; });

	//update link positions
	//simply tells one end of the line to follow one node around
	//and the other end of the line to follow the other node around
	link
	.attr("x1", function(d) { return d.source.x; })
	.attr("y1", function(d) { return d.source.y; })
	.attr("x2", function(d) { return d.target.x; })
	.attr("y2", function(d) { return d.target.y; });
	}
	</script>