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exploder.js
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exploder.js
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/*
D3 Exploder! extension
Ben Southgate
Copyright (c) 2015 Benjamin Southgate
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
(function(d3) {
d3.geo.exploder = function exploder() {
// attributes / methods for explode
var methods = ["size", "position", "projection"],
// no need to initialize path each time expode is called
path = d3.geo.path();
// explode selection
function explode(selection) {
// check for necessary parameters
methods.forEach(function(option) {
if (!config[option]) {
throw "exploder.js: " + option + " not provided to exploder.";
}
});
// local references to configuration
var projection = config.projection,
size = config.size,
position = config.position,
scale = projection.scale(),
cache = {};
// update projection of path function
path.projection(projection);
// move features based on configuration
selection
// the order of the attribute changes matters!
// setting 'd' caches the new scale which is used
// in the transform change
.attr('d', function(d, i) {
// compute size based on user functions
var sz = size(d, i);
// calculate new scale for projection based on desired
// pixed size of feature
var bounds = path.projection(projection.scale(scale)).bounds(d),
w = bounds[1][0] - bounds[0][0],
h = bounds[1][1] - bounds[0][1],
sc = cache[i] = Math.min(sz / h, sz / w);
// scale projection to desired size
// and calculate new centroid to translate to
path.projection(projection.scale(scale*sc));
// return scaled path
return path(d);
})
// calculate new transform after finding scale
.attr("transform", function(d, i) {
// scale projection to desired size
// and calculate new centroid to translate to
path.projection(projection.scale(scale*cache[i]));
var C = path.centroid(d),
// compute size and positionment based on user functions
A = position(d, i);
// return desired coordinates offset by centroid
return "translate(" + [A[0] - C[0], A[1] - C[1]] + ")";
});
// reset scale for projection
projection.scale(scale);
}
// create getters / setters
var config = {};
methods.forEach(function(option) {
config[option] = null;
explode[option] = function(value) {
if (!arguments.length) return config[option];
if (!(value instanceof Function)) {
throw "exploder.js: " + option + " needs to be a function.";
}
config[option] = value;
return explode;
};
});
// return configurable exploder function
return explode;
};
// semantic version
d3.geo.exploder.version = "1.0.4";
})(d3);