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Radial Tree with UI
license: bsd-3-clause # Copyright 2015 Wm Leler
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<!DOCTYPE html>
<html>
<head>
<title>Radial Tree Help</title>
<style>
body {
font-family: Roboto, Helvetica, sans-serif;
}
table {
border: solid black 1px;
}
td {
text-align: center;
padding: 2px 3px;
}
li {
line-height: 1.3em;
}
</style>
</head>
<body>
<h1>Radial Tree</h1>
<p>
This animated radial tree is collapsible and expandible, and you can change the root of the tree.
It has a full user interface, including mouse, mousewheel (if you have one), and keyboard shortcuts.
It may also work on touch screens, although that has not been tested.
The tree automatically resizes to fit the window.
</p>
<p>
See the gist in action at <a href="http://bl.ocks.org/wmleler/raw/a734fb2bb3319a2cb386/"
target="_blank">http://bl.ocks.org/wmleler/raw/a734fb2bb3319a2cb386/</a>
The source is on github at <a href="https://gist.github.com/wmleler/a734fb2bb3319a2cb386"
target="_blank">https://gist.github.com/wmleler/a734fb2bb3319a2cb386</a>
</p>
<h2>User Interface</h2>
<p>
Initially, the root node of the tree is selected.
Click on any node in the tree to select it; node is then highlighted and
path to it is displayed in toolbar.
Click on any name in path to change the root. The current root is shown in bold.
</p>
<p>
If the center of a node is colored in, then it has (hidden) children:
<ul>
<li>Double-click on the node to expand its immediate children (or if they are showing, to collapse them).</li>
<li>Hold down the shift key and double click a node to expand/collapse all descendent children.</li>
<li>Press the "/" key to set the root of the tree to the currently selected node.
Press again to reset it back to the original root.</li>
</ul>
</p>
<p>Right-click on a node to bring up a context menu that gives you shortcuts for
expanding and collapsing nodes, changing the root, and recentering the view.</p>
<table>
<thead style="font-weight:bold">
<tr><td>Function</td><td>Tool</td><td>Keyboard shortcut</td><td>Context menu</td><td>Other</td><td>Description</td></tr>
</thead>
<tr><td>Zoom In</td><td>+</td><td>+</td><td></td><td>scrollwheel</td></tr>
<tr><td>Zoom Out</td><td>&minus;</td><td>&minus;</td><td></td><td>scrollwheel</td></tr>
<tr><td>Rotate CCW</td><td>&#8634;</td><td>"Page Up"</td><td></td><td>shift + scrollwheel</td></tr>
<tr><td>Rotate CW</td><td>&#8635;</td><td>"Page Down"</td><td></td><td>shift + scrollwheel</td></tr>
<tr><td>Select Up</td><td>&#8613;</td><td>shift + &uarr;</td><td></td><td></td><td>move selection to previous child</tr>
<tr><td>Select Down</td><td>&#8615;</td><td>shift + &darr;</td><td></td><td></td><td>move selection to next child</tr>
<tr><td>Select Parent</td><td></td><td>shift + &larr;</td><td></td><td></td><td>move selection to parent</tr>
<tr><td>Select Child</td><td></td><td>shift + &rarr;</td><td></td><td></td><td>move selection to first child</tr>
<tr><td>View Home</td><td>&#8962;</td><td>"Home"</td><td>Center Root</td><td></td><td>reset rotate and zoom</td></tr>
<tr><td>View Selected</td><td>&#9673;</td><td>"End"</td><td>Center This Node</td><td></td><td>center selection</tr>
<tr><td>Toggle 1</td><td>1</td><td>space bar</td><td>Node</td><td>double-click</td><td>expand/collapse immediate children</tr>
<tr><td>Expand Level</td><td>&oplus;</td><td>"Return"</td><td>Expand 1 Level</td><td>shift + double-click</td><td>expand/collapse all children</tr>
<tr><td>Toggle Root</td><td>/</td><td>/</td><td>Set Root</td><td></td><td>change root to selection (and back)</tr>
</table>
<p>Hover over any tool button to see a popup tooltip containing keyboard shortcuts.</p>
<p>Note that there is no toolbar button for Select Parent or Select Child;
use the keyboard shortcut (shift + arrow key), or the mouse to select any node.</p>
<p>Hold down the alt/option key to slow down the transition animations or the rate of zooming and rotation.</p>
<p>Hold down shift key and press the &oplus; tool to force expand entire tree from selection. This is also available in the context menu as "Expand Full Tree".</p>
<p>Hold down shift key and press the &#8962; tool to reset root.</p>
<img src="thumbnail.png" />
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>Radial Tree</title>
<script src="d3.min.js" charset="utf-8"></script>
<link rel="stylesheet" type="text/css" href="radial-tree.css">
</head>
<body>
<div id="tree-container"></div>
<div id="toolbar">
<div class="tool">
<div id="help" title="click for help"><a href="help.html" target="_blank">HELP</a></div>
</div>
<div class="tool">
<div class="tlabel">zoom</div>
<div class="tbuttons">
<div class="button" data-key="187" title="Zoom In (+ OR scrollwheel)">+</div>
<div class="button" data-key="189" title="Zoom Out (&minus; OR scrollwheel)">&minus;</div>
</div>
</div>
<div class="tool">
<div class="tlabel">rotate</div>
<div class="tbuttons">
<div class="button" data-key="33" title="Rotate CCW (Page Up OR &#8679;scrollwheel)" style="font-size:0.9em">&#8634;</div>
<div class="button" data-key="34" title="Rotate CW (Page Down OR &#8679;scrollwheel)" style="font-size:0.9em">&#8635;</div>
</div>
</div>
<div class="tool">
<div class="tlabel">select</div>
<div class="tbuttons">
<div class="button" data-key="-38" title="Select Previous (&#8679;&uarr;)" style="font-size:0.9em">&#8613;</div>
<div class="button" data-key="-40" title="Select Next (&#8679;&darr;)" style="font-size:0.9em">&#8615;</div>
</div>
</div>
<div class="tool">
<div class="tlabel">view</div>
<div class="tbuttons">
<div class="button" data-key="36" title="Center Root (Home)">&#8962;</div>
<div class="button" data-key="35" title="Center Selected (End)" style="font-size:0.8em">&#9673;</div>
</div>
</div>
<div class="tool">
<div class="tlabel">toggle</div>
<div class="tbuttons">
<div class="button" data-key="32" title="Toggle Node (Space OR double-click)">1</div>
<div class="button" data-key="13" title="Toggle Level (Return OR &#8679;double-click)">&oplus;</div>
<div class="button" data-key="191" title="Toggle Root (/)">/</div>
</div>
</div>
<div class="tool">
<div class="tlabel" style="text-align:left" title="Change Root">&nbsp;selection</div>
<div id="selection" class="tlabel"></div>
</div>
</div>
<div id="contextmenu">
<div data-key="32"><span class="expcol">Expand</span> Node</div>
<div data-key="13">Expand 1 Level</div>
<div data-key="-13">Expand Full Tree</div>
<div data-key="35">Center This Node</div>
<div data-key="36">Center Root</div>
<div data-key="191">Set Root</div>
</div>
<script type="text/javascript" src="radial-tree.js"></script>
</body>
</html>
#toolbar {
display: flex;
display: -webkit-box;
display: moz-box-flex;
display: -ms-flexbox;
display: -webkit-flex;
flex-wrap: wrap;
position: fixed;
top: 10px;
left: 10px;
font-family: Roboto, Helvetica, sans-serif;
box-shadow: 1px 1px 3px;
background-color: #ECEFF1;
}
.tool {
display: flex;
flex-direction: column;
border: solid black 1px;
padding: 1px;
}
.tlabel {
text-align: center;
padding: 3px 2px 1px 2px;
}
.tbuttons {
display: flex;
display: -webkit-box;
display: moz-box-flex;
display: -ms-flexbox;
display: -webkit-flex;
flex-wrap: wrap;
flex-direction: row;
}
.button {
border: outset gray 2px;
border-radius: 4px;
cursor: pointer;
padding: 1px 3px;
min-width: 12px;
text-align: center;
margin: 2px;
font-family: "Courier New", Courier, monospace;
background-color: white;
}
.button:hover {
background-color: yellow;
}
.button:active {
border: inset gray 2px;
}
#selection {
margin: 2px 5px;
vertical-align: middle;
font-family: "Courier New", Courier, monospace;
color: black;
background-color: white;
}
#selection span.nodepath:hover {
background-color: rgba(0, 0, 25, 0.1);
cursor: pointer;
}
#selection span.nodepath.highlight {
font-weight: bold;
}
#contextmenu {
display: none;
position: absolute;
border: solid black 1px;
box-shadow: 2px 2px 3px gray;
padding: 2px;
background-color: white;
font-family: Roboto, Helvetica, sans-serif;
font-size: 0.9em;
}
#contextmenu div {
padding: 4px 10px;
cursor: pointer;
}
#contextmenu div:hover {
background-color: rgba(0, 0, 25, 0.1);
}
#contextmenu span.expcol {
pointer-events: none;
}
#help {
position: relative;
bottom: -1.8em;
transform: rotate(270deg);
-webkit-transform: rotate(270deg);
-moz-transform: rotate(270deg);
-o-transform: rotate(270deg);
width: 1.2em;
}
#help a {
color: black;
text-decoration: none;
background-color: white;
}
#help:hover a {
background-color: yellow;
}
#tree-container, svg {
overflow: hidden;
}
.node {
cursor: pointer;
}
.node circle {
fill: #fff;
}
.node text {
font-size: 12px;
font-family: Roboto, sans-serif;
text-shadow: 4px 4px 3px white, -4px -4px 3px white;
}
.node text:hover {
font-size: 1.2em;
transition: font-size 0.1s;
}
.node text:not(:hover) {
transition: font-size 1s;
transition-delay: 0.5s;
}
.link {
fill: none;
stroke: #ccc;
stroke-width: 1.5px;
}
// Get JSON data
d3.json('data-flare.json', function(error, treeData) {
var DURATION = 700; // d3 animation duration
var STAGGERN = 4; // delay for each node
var STAGGERD = 200; // delay for each depth
var NODE_DIAMETER = 4; // diameter of circular nodes
var MIN_ZOOM = 0.5; // minimum zoom allowed
var MAX_ZOOM = 10; // maximum zoom allowed
var HAS_CHILDREN_COLOR = 'lightsteelblue';
var SELECTED_COLOR = '#a00'; // color of selected node
var ZOOM_INC = 0.04; // zoom factor per animation frame
var PAN_INC = 3; // pan per animation frame
var ROT_INC = 0.3; // rotation per animation frame
var counter = 0; // node ids
var curNode; // currently selected node
var curPath; // array of nodes in the path to the currently selected node
// size of the diagram
var width = window.innerWidth - 20;
var height = window.innerHeight - 20;
// current pan, zoom, and rotation
var curX = width / 2;
var curY = height / 2;
var curZ = 1.0; // current zoom
var curR = 270; // current rotation
// keyboard key codes
var KEY_PLUS = 187; // + (zoom in)
var KEY_MINUS = 189; // - (zoom out)
var KEY_SLASH = 191; // / (slash)
var KEY_PAGEUP = 33; // (rotate CCW)
var KEY_PAGEDOWN = 34; // (rotate CW)
var KEY_LEFT = 37; // left arrow
var KEY_UP = 38; // up arrow
var KEY_RIGHT = 39; // right arrow
var KEY_DOWN = 40; // down arrow
var KEY_SPACE = 32; // (expand node)
var KEY_RETURN = 13; // (expand tree)
var KEY_HOME = 36; // (center root)
var KEY_END = 35; // (center selection)
// d3 diagonal projection for use by the node paths
var diagonal= d3.svg.diagonal.radial()
.projection(function(d) {
return [d.y, d.x / 180 * Math.PI];
});
// d3 tree layout
var tree = d3.layout.tree()
// .nodeSize([4.5, 120])
.size([360, Math.min(width, height) / 2 - 120])
.separation(function(a, b) {
return a.depth === 0 ? 1 : (a.parent === b.parent ? 1 : 2) / a.depth;
});
// define the svgBase, attaching a class for styling and the zoomListener
var svgBase = d3.select('#tree-container').append('svg')
.attr('width', width)
.attr('height', height)
.on('mousedown', mousedown);
// Group which holds all nodes and manages pan, zoom, rotate
var svgGroup = svgBase.append('g')
.attr('transform', 'translate(' + curX + ',' + curY + ')');
d3.select(document) // set up document events
.on('wheel', wheel) // zoom, rotate
.on('keydown', keydown)
.on('keyup', keyup);
d3.select(window).on('resize', resize);
d3.selectAll('.button')
.on('mousedown', tooldown)
.on('mouseup', toolup);
d3.select('#selection').on('mousedown', switchroot);
d3.select('#contextmenu').on('mouseup', menuSelection);
// Define the data root
var root = treeData;
root.x0 = curY;
root.y0 = 0;
selectNode(root); // current selected node
// Collapse all children of root's children before rendering
// if (root.children) {
// root.children.forEach(function(child) {
// collapseTree(child);
// });
// }
update(root, true); // Layout the tree initially and center on the root node
// update the tree
// source - source node of the update
// transition - whether to do a transition
function update(source, transition) {
var duration = transition ?
(d3.event && d3.event.altKey ? DURATION * 4 : DURATION) : 0;
// Compute the new tree layout.
var nodes = tree.nodes(root);
var links = tree.links(nodes);
// Update the view
svgGroup.transition().duration(duration)
.attr('transform',
'rotate(' + curR + ' ' + curX + ' ' + curY +
')translate(' + curX + ' ' + curY +
')scale(' + curZ + ')');
// Update the nodes…
var node = svgGroup.selectAll('g.node')
.data(nodes, function(d) {
return d.id || (d.id = ++counter);
});
// Enter any new nodes at the parent's previous position
var nodeEnter = node.enter().insert('g', ':first-child')
.attr('class', 'node')
.attr('transform', 'rotate(' + (source.x0 - 90) + ')translate(' + source.y0 + ')')
.on('click', click).on('dblclick', dblclick).on('contextmenu', showContextMenu);
// .on('mousedown', suppress);
nodeEnter.append('circle')
.attr('r', 1e-6)
.style('fill', function(d) {
return d._children ? HAS_CHILDREN_COLOR : 'white';
});
nodeEnter.append('text')
.text(function(d) {
return d.name;
})
.style('opacity', 0.9)
.style('fill-opacity', 0)
.attr('transform', function() {
return ((source.x0 + curR) % 360 <= 180 ?
'translate(8)scale(' :
'rotate(180)translate(-8)scale('
) + reduceZ() + ')';
});
// update existing graph nodes
// Change the circle fill depending on whether it has children and is collapsed
node.select('circle')
.attr('r', NODE_DIAMETER * reduceZ())
.style('fill', function(d) {
return d._children ? HAS_CHILDREN_COLOR : 'white';
}).attr('stroke', function(d) {
return d.selected ? SELECTED_COLOR : 'steelblue';
}).attr('stroke-width', function(d) {
return d.selected ? 3 : 1.5;
});
node.select('text')
.attr('text-anchor', function(d) {
return (d.x + curR) % 360 <= 180 ? 'start' : 'end';
}).attr('transform', function(d) {
return ((d.x + curR) % 360 <= 180 ?
'translate(8)scale(' :
'rotate(180)translate(-8)scale('
) + reduceZ() +')';
}).attr('fill', function(d) {
return d.selected ? SELECTED_COLOR : 'black';
}).attr('dy', '.35em');
var nodeUpdate = node.transition().duration(duration)
.delay( transition ? function(d, i) {
return i * STAGGERN +
Math.abs(d.depth - curNode.depth) * STAGGERD; } : 0)
.attr('transform', function(d) {
return 'rotate(' + (d.x - 90) + ')translate(' + d.y + ')';
});
nodeUpdate.select('circle')
.attr('r', NODE_DIAMETER * reduceZ());
// .style('fill', function(d) {
// return d._children ? HAS_CHILDREN_COLOR : 'white';
// });
nodeUpdate.select('text')
.style('fill-opacity', 1);
// Transition exiting nodes to the parent's new position and remove
var nodeExit = node.exit().transition().duration(duration)
.delay( transition ? function(d, i) {
return i * STAGGERN; } : 0)
.attr('transform', function() {
return 'rotate(' + (source.x - 90) +')translate(' + source.y + ')';
}).remove();
nodeExit.select('circle').attr('r', 0);
nodeExit.select('text').style('fill-opacity', 0);
// Update the links…
var link = svgGroup.selectAll('path.link')
.data(links, function(d) {
return d.target.id;
});
// Enter any new links at the parent's previous position
link.enter().insert('path', 'g')
.attr('class', 'link')
.attr('d', function() {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
});
// Transition links to their new position
link.transition().duration(duration)
.delay( transition ? function(d, i) {
return i * STAGGERN +
Math.abs(d.source.depth - curNode.depth) * STAGGERD;
// Math.max(0, d.source.depth - curNode.depth) * STAGGERD;
} : 0)
.attr('d', diagonal);
// Transition exiting nodes to the parent's new position
link.exit().transition().duration(duration)
.attr('d', function() {
var o = {
x: source.x0,
y: source.y0
};
return diagonal({
source: o,
target: o
});
}).remove();
// Stash the old positions for transition
nodes.forEach(function(d) {
d.x0 = d.x;
d.y0 = d.y;
});
} // end update
// Helper functions for collapsing and expanding nodes
// Toggle expand / collapse
function toggle(d) {
if (d.children) {
d._children = d.children;
d.children = null;
} else if (d._children) {
d.children = d._children;
d._children = null;
}
}
function toggleTree(d) {
if (d.children) {
collapseTree(d);
} else {
expandTree(d);
}
}
function expand(d) {
if (d._children) {
d.children = d._children;
d._children = null;
}
}
// expand all children, whether expanded or collapsed
function expandTree(d) {
if (d._children) {
d.children = d._children;
d._children = null;
}
if (d.children) {
d.children.forEach(expandTree);
}
}
function collapse(d) {
if (d.children) {
d._children = d.children;
d.children = null;
}
}
// collapse all children
function collapseTree(d) {
if (d.children) {
d._children = d.children;
d.children = null;
}
if (d._children) {
d._children.forEach(collapseTree);
}
}
// expand one level of tree
function expand1Level(d) {
var q = [d]; // non-recursive
var cn;
var done = null;
while (q.length > 0) {
cn = q.shift();
if (done !== null && done < cn.depth) { return; }
if (cn._children) {
done = cn.depth;
cn.children = cn._children;
cn._children = null;
cn.children.forEach(collapse);
}
if (cn.children) { q = q.concat(cn.children); }
}
// no nodes to open
}
// highlight selected node
function selectNode(node) {
if (curNode) {
delete curNode.selected;
}
curNode = node;
curNode.selected = true;
curPath = []; // filled in by fullpath
d3.select('#selection').html(fullpath(node));
}
// for displaying full path of node in tree
function fullpath(d, idx) {
idx = idx || 0;
curPath.push(d);
return (d.parent ? fullpath(d.parent, curPath.length) : '') +
'/<span class="nodepath'+(d.name === root.name ? ' highlight' : '')+
'" data-sel="'+ idx +'" title="Set Root to '+ d.name +'">' +
d.name + '</span>';
}
// d3 event handlers
function switchroot() {
d3.event.preventDefault();
var pathelms = document.querySelectorAll('#selection .nodepath');
for (var i = 0; i < pathelms.length; i++) {
pathelms[i].classList.remove('highlight');
}
var target = d3.event.target;
var node = curPath[+target.dataset.sel];
if (d3.event.shiftKey) {
if (curNode !== node) {
selectNode(node);
}
} else {
root = node;
target.classList.add('highlight');
}
update(root, true);
}
function resize() { // window resize
var oldwidth = width;
var oldheight = height;
width = window.innerWidth - 20;
height = window.innerHeight - 20;
tree.size([360, Math.min(width, height) / 2 - 120]);
svgBase.attr('width', width).attr('height', height);
curX += (width - oldwidth) / 2;
curY += (height - oldheight) / 2;
svgGroup.attr('transform', 'rotate(' + curR + ' ' + curX + ' ' + curY +
')translate(' + curX + ' ' + curY + ')scale(' + curZ + ')');
update(root);
}
function click(d) { // select node
if (d3.event.defaultPrevented || d === curNode) { return; } // suppressed
d3.event.preventDefault();
selectNode(d);
update(d);
}
function dblclick(d) { // Toggle children of node
if (d3.event.defaultPrevented) { return; } // click suppressed
d3.event.preventDefault();
if (d3.event.shiftKey) {
expand1Level(d); // expand node by one level
} else {
toggle(d);
}
update(d, true);
}
function tooldown(d) { // tool button pressed
d3.event.preventDefault();
d3.select(d3.event.target).on('mouseout', toolup);
var key = +d3.event.target.dataset.key;
keydown(Math.abs(key), key < 0 || d3.event.shiftKey);
}
function toolup() { // tool button released
d3.event.preventDefault();
d3.select(d3.event.target).on('mouseout', null);
keyup(Math.abs(+d3.event.target.dataset.key));
}
// right click, show context menu and select this node
function showContextMenu(d) {
d3.event.preventDefault();
d3.selectAll('.expcol').text(d.children ? 'Collapse' : 'Expand');
d3.select('#contextmenu').style({
left: (d3.event.pageX + 3) + 'px',
top: (d3.event.pageY + 8) + 'px',
display: 'block'
});
d3.select(document).on('mouseup', hideContextMenu);
selectNode(d);
update(d);
}
function hideContextMenu() {
d3.select('#contextmenu').style('display', 'none');
d3.select(document).on('mouseup', null);
}
function menuSelection() {
d3.event.preventDefault();
var key = +d3.event.target.dataset.key;
keydown(Math.abs(key), key < 0 || d3.event.shiftKey);
}
var startposX, startposY; // initial position on mouse button down for pan
function mousedown() { // pan
d3.event.preventDefault();
if (d3.event.which !== 1 || d3.event.ctrlKey) { return; } // ingore other mouse buttons
startposX = curX - d3.event.clientX;
startposY = curY - d3.event.clientY;
d3.select(document).on('mousemove', mousemove, true);
d3.select(document).on('mouseup', mouseup, true);
}
function mousemove() {
d3.event.preventDefault();
curX = startposX + d3.event.clientX;
curY = startposY + d3.event.clientY;
setview();
}
function mouseup() {
d3.select(document).on('mousemove', null);
d3.select(document).on('mouseup', null);
}
var keysdown = []; // which keys are currently down
var moveX = 0, moveY = 0, moveZ = 0, moveR = 0; // animations
var aniRequest = null;
function wheel() { // mousewheel
var dz, newZ;
var slow = d3.event.altKey ? 0.25 : 1;
if (d3.event.wheelDeltaY !== 0) { // up-down
dz = Math.pow(1.2, d3.event.wheelDeltaY * 0.001 * slow);
newZ = limitZ(curZ * dz);
dz = newZ / curZ;
curZ = newZ;
curX -= (d3.event.clientX - curX) * (dz - 1);
curY -= (d3.event.clientY - curY) * (dz - 1);
setview();
}
if (d3.event.wheelDeltaX !== 0) { // left-right
curR = limitR(curR + d3.event.wheelDeltaX * 0.01 * slow);
update(root);
}
}
// keyboard shortcuts
function keydown(key, shift) {
if (!key) {
key = d3.event.which; // fake key
shift = d3.event.shiftKey;
}
var parch; // parent's children
var slow = d3.event.altKey ? 0.25 : 1;
if (keysdown.indexOf(key) >= 0) { return; } // defeat auto repeat
switch (key) {
case KEY_PLUS: // zoom in
moveZ = ZOOM_INC * slow;
break;
case KEY_MINUS: // zoom out
moveZ = -ZOOM_INC * slow;
break;
case KEY_SLASH: // toggle root to selection
root = root === curNode ? treeData : curNode;
update(root, true);
curPath = []; // filled in by fullpath
d3.select('#selection').html(fullpath(curNode));
return;
case KEY_PAGEUP: // rotate counterclockwise
moveR = -ROT_INC * slow;
break;
case KEY_PAGEDOWN: // zoom out
moveR = ROT_INC * slow; // rotate clockwise
break;
case KEY_LEFT: // left arrow
if (shift) { // move selection to parent
if (!curNode) {
selectNode(root);
} else if (curNode.parent) {
selectNode(curNode.parent);
}
update(curNode);
return;
}
moveX = -PAN_INC * slow;
break;
case KEY_UP: // up arrow
if (shift) { // move selection to previous child
if (!curNode) {
selectNode(root);
} else if (curNode.parent) {
parch = curNode.parent.children;
selectNode(parch[(parch.indexOf(curNode) +
parch.length - 1) % parch.length]);
}
update(curNode);
return;
}
moveY = -PAN_INC * slow;
break;
case KEY_RIGHT: // right arrow
if (shift) { // move selection to first/last child
if (!curNode) {
selectNode(root);
} else {
if (curNode.children) {
selectNode(curNode.children[d3.event.altKey ?
curNode.children.length - 1 : 0]);
}
}
update(curNode);
return;
}
moveX = PAN_INC * slow;
break;
case KEY_DOWN: // down arrow
if (shift) { // move selection to next child
if (!curNode) {
selectNode(root);
} else if (curNode.parent) {
parch = curNode.parent.children;
selectNode(parch[(parch.indexOf(curNode) + 1) % parch.length]);
}
update(curNode);
return;
}
moveY = PAN_INC * slow;
break;
case KEY_SPACE: // expand/collapse node
if (!curNode) {
selectNode(root);
}
toggle(curNode);
update(curNode, true);
return;
case KEY_RETURN: // expand/collapse tree
if (!curNode) {
selectNode(root);
}
if (shift) {
expandTree(curNode);
} else {
expand1Level(curNode);
}
update(curNode, true);
return;
case KEY_HOME: // reset transform
if (shift) {
root = treeData;
}
curX = width / 2;
curY = height / 2;
curR = limitR(90 - root.x);
curZ = 1;
update(root, true);
return;
case KEY_END: // zoom to selection
if (!curNode) { return; }
curX = width / 2 - curNode.y * curZ;
curY = height / 2;
curR = limitR(90 - curNode.x);
update(curNode, true);
return;
default: return; // ignore other keys
} // break jumps to here
keysdown.push(key);
// start animation if anything happening
if (keysdown.length > 0 && aniRequest === null) {
aniRequest = requestAnimationFrame(frame);
}
}
function keyup(key) {
key = key || d3.event.which;
var pos = keysdown.indexOf(key);
if (pos < 0) { return; }
switch (key) {
case KEY_PLUS: // zoom out
case KEY_MINUS: // zoom in
moveZ = 0;
break;
case KEY_PAGEUP: // rotate CCW
case KEY_PAGEDOWN: // rotate CW
moveR = 0;
break;
case KEY_LEFT: // left arrow
case KEY_RIGHT: // right arrow
moveX = 0;
break;
case KEY_UP: // up arrow
case KEY_DOWN: // down arrow
moveY = 0;
break;
}
keysdown.splice(pos, 1); // remove key
if (keysdown.length > 0 || aniRequest === null) { return; }
cancelAnimationFrame(aniRequest);
aniRequest = aniTime = null;
}
var aniTime = null;
// update animation frame
function frame(frametime) {
var diff = aniTime ? (frametime - aniTime) / 16 : 0;
aniTime = frametime;
var dz = Math.pow(1.2, diff * moveZ);
var newZ = limitZ(curZ * dz);
dz = newZ / curZ;
curZ = newZ;
curX += diff * moveX - (width / 2- curX) * (dz - 1);
curY += diff * moveY - (height / 2 - curY) * (dz - 1);
curR = limitR(curR + diff * moveR);
setview();
aniRequest = requestAnimationFrame(frame);
}
// enforce zoom extent
function limitZ(z) {
return Math.max(Math.min(z, MAX_ZOOM), MIN_ZOOM);
}
// keep rotation between 0 and 360
function limitR(r) {
return (r + 360) % 360;
}
// limit size of text and nodes as scale increases
function reduceZ() {
return Math.pow(1.1, -curZ);
}
// set view with no animation
function setview() {
svgGroup.attr('transform', 'rotate(' + curR + ' ' + curX + ' ' + curY +
')translate(' + curX + ' ' + curY + ')scale(' + curZ + ')');
svgGroup.selectAll('text')
.attr('text-anchor', function(d) {
return (d.x + curR) % 360 <= 180 ? 'start' : 'end';
})
.attr('transform', function(d) {
return ((d.x + curR) % 360 <= 180 ?
'translate(8)scale(' :
'rotate(180)translate(-8)scale('
) + reduceZ() +')';
});
svgGroup.selectAll('circle').attr('r', NODE_DIAMETER * reduceZ());
}
});
@timelyportfolio
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I love this. Glad I found it from your show and tell on youtube. What license do you intend to apply? I am asking because I would like to try to add it into the networkD3 htmlwidget for R. Thanks so much for sharing.

@timelyportfolio
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Here is the post describing how your radial tree became a R htmlwidget http://www.buildingwidgets.com/blog/2015/5/28/week-21-radialnetwork

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