d3Utils.js
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/*
* Copyright 2014 Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
Utility functions for D3 visualizations.
@author Simon Hunt
*/
(function (onos) {
'use strict';
function createDragBehavior(force, selectCb, atDragEnd, requireMeta) {
var draggedThreshold = d3.scale.linear()
.domain([0, 0.1])
.range([5, 20])
.clamp(true),
drag;
// TODO: better validation of parameters
if (!$.isFunction(selectCb)) {
alert('d3util.createDragBehavior(): selectCb is not a function')
}
if (!$.isFunction(atDragEnd)) {
alert('d3util.createDragBehavior(): atDragEnd is not a function')
}
if (!$.isFunction(requireMeta)) {
alert('d3util.createDragBehavior(): requireMeta is not a function')
}
function dragged(d) {
var threshold = draggedThreshold(force.alpha()),
dx = d.oldX - d.px,
dy = d.oldY - d.py;
if (Math.abs(dx) >= threshold || Math.abs(dy) >= threshold) {
d.dragged = true;
}
return d.dragged;
}
drag = d3.behavior.drag()
.origin(function(d) { return d; })
.on('dragstart', function(d) {
if (requireMeta() ^ !d3.event.sourceEvent.metaKey) {
d3.event.sourceEvent.stopPropagation();
d.oldX = d.x;
d.oldY = d.y;
d.dragged = false;
d.fixed |= 2;
d.dragStarted = true;
}
})
.on('drag', function(d) {
if (requireMeta() ^ !d3.event.sourceEvent.metaKey) {
d.px = d3.event.x;
d.py = d3.event.y;
if (dragged(d)) {
if (!force.alpha()) {
force.alpha(.025);
}
}
}
})
.on('dragend', function(d) {
if (d.dragStarted) {
d.dragStarted = false;
if (!dragged(d)) {
// consider this the same as a 'click' (selection of node)
selectCb(d, this); // TODO: set 'this' context instead of param
}
d.fixed &= ~6;
// hook at the end of a drag gesture
atDragEnd(d, this); // TODO: set 'this' context instead of param
}
});
return drag;
}
function appendGlow(svg) {
// TODO: parameterize color
var glow = svg.append('filter')
.attr('x', '-50%')
.attr('y', '-50%')
.attr('width', '200%')
.attr('height', '200%')
.attr('id', 'blue-glow');
glow.append('feColorMatrix')
.attr('type', 'matrix')
.attr('values', '0 0 0 0 0 ' +
'0 0 0 0 0 ' +
'0 0 0 0 .7 ' +
'0 0 0 1 0 ');
glow.append('feGaussianBlur')
.attr('stdDeviation', 3)
.attr('result', 'coloredBlur');
glow.append('feMerge').selectAll('feMergeNode')
.data(['coloredBlur', 'SourceGraphic'])
.enter().append('feMergeNode')
.attr('in', String);
}
// === register the functions as a library
onos.ui.addLib('d3util', {
createDragBehavior: createDragBehavior,
appendGlow: appendGlow
});
}(ONOS));