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gauge.js
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gauge.js
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nv.models.gauge = function() {
"use strict";
//============================================================
// Public Variables with Default Settings
//------------------------------------------------------------
var margin = {top: 0, right: 0, bottom: 0, left: 0}
, width = 500
, height = 500
, id = Math.floor(Math.random() * 10000) //Create semi-unique ID in case user doesn't select one
, color = nv.utils.getColor(['#88ac67', '#f78f20', '#db4e4e'])
, valueFormat = d3.format(',.2f')
, title = false
, showMinMaxLabels = false
, min = 0
, max = 100
, zoneLimit1 = 0.6
, zoneLimit2 = 0.8
, dispatch = d3.dispatch('chartClick', 'renderEnd')
;
//============================================================
// chart function
//------------------------------------------------------------
var renderWatch = nv.utils.renderWatch(dispatch);
function chart(selection) {
renderWatch.reset();
selection.each(function(data) {
var availableWidth = width - margin.left - margin.right
, availableHeight = height - margin.top - margin.bottom
, container = d3.select(this)
;
var cx = availableWidth / 2;
var cy = availableHeight / 2;
nv.utils.initSVG(container);
var radius = Math.min(availableWidth, availableHeight) / 2;
var range = max - min;
var fontSize = Math.round(Math.min(availableWidth, availableHeight) / 9);
var zones = [
{ from: min, to: min + range * zoneLimit1 },
{ from: min + range * zoneLimit1, to: min + range * zoneLimit2 },
{ from: min + range * zoneLimit2, to: max }
];
// Setup containers and skeleton of chart
var wrap = container.selectAll('.nv-wrap.nv-gauge').data([data]);
var wrapEnter = wrap.enter().append('g').attr('class','nvd3 nv-wrap nv-gauge nv-chart-' + id);
var gEnter = wrapEnter.append('g');
var g_bands = gEnter.append('g').attr('class', 'nv-gaugeBands');
var g_title = gEnter.append('g').attr('class', 'nv-gaugeTitle');
var g_needle = gEnter.append('g').attr('class', 'nv-gaugeNeedle');
var g_label = gEnter.append('g').attr('class', 'nv-gaugeLabel');
var g_minLabel = gEnter.append('g').attr('class', 'nv-gaugeMinLabel');
var g_maxLabel = gEnter.append('g').attr('class', 'nv-gaugeMaxLabel');
wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
// draw gauge bands
for (var i in zones) {
drawBand(zones[i].from, zones[i].to, color(i), min, max, radius, g_bands);
}
// draw needle
var needlePath = buildNeedlePath(data[0][0], range, cx, cy, min, max, radius);
var needleLine = d3.svg.line()
.x(function(d) { return d.x; })
.y(function(d) { return d.y; })
.interpolate("basis");
g_needle.append("path")
.data([needlePath])
.attr("d", needleLine);
g_needle.append('circle')
.attr('cx', 0)
.attr('cy', 0)
.attr('r', 0.115 * radius);
wrap.selectAll('.nv-gaugeBands path')
.attr("transform", function () { return "translate(" + cx + ", " + (cy - 0.08 * radius) + ") rotate(270)" });
wrap.select('.nv-gaugeNeedle')
.attr('transform', 'translate(' + cx + ',' + (cy - 0.08 * radius) + ')');
wrap.select('.nv-gaugeTitle')
.attr('transform', 'translate(' + cx + ',' + (cy / 2 + fontSize / 2) + ')');
wrap.select('.nv-gaugeLabel')
.attr('transform', 'translate(' + cx + ',' + (cy + radius / 2 - fontSize * 0.9) + ')');
if (showMinMaxLabels) {
wrap.select('.nv-gaugeMinLabel')
.attr('transform', 'translate(' + (cx - radius / 2.6 - fontSize * 0.9) + ',' + (cy + radius / 1.35 - fontSize * 0.9) + ')');
wrap.select('.nv-gaugeMaxLabel')
.attr('transform', 'translate(' + (cx + radius / 1.25 - fontSize * 0.9) + ',' + (cy + radius / 1.35 - fontSize * 0.9) + ')');
}
// draw title
if (title) {
g_title.append("text")
.attr("dy", fontSize / 2)
.attr("text-anchor", "middle")
.text(title)
.style("font-size", fontSize + "px");
}
// draw value
g_label.append("text")
.data(data)
.attr("dy", fontSize / 2)
.attr("text-anchor", "middle")
.text(valueFormat)
.style("font-size", fontSize*0.9 + "px");
if (showMinMaxLabels) {
g_minLabel.append("text")
.data(data)
.attr("dy", fontSize / 2)
.attr("text-anchor", "start")
.text(valueFormat(min))
.style("font-size", fontSize*0.45 + "px");
g_maxLabel.append("text")
.data(data)
.attr("dy", fontSize / 2)
.attr("text-anchor", "end")
.text(valueFormat(max))
.style("font-size", fontSize*0.45 + "px");
}
container.on('click', function(d,i) {
dispatch.chartClick({
data: d,
index: i,
pos: d3.event,
id: id
});
});
// draws a gauge band
function drawBand(start, end, color, min, max, radius, element) {
if (0 >= end - start) return;
element.append("path")
.style("fill", color)
.attr("d", d3.svg.arc()
.startAngle(valueToRadians(start, min, max))
.endAngle(valueToRadians(end, min, max))
.innerRadius(0.65 * radius)
.outerRadius(0.85 * radius))
.attr("transform", function() { return "translate(" + radius + ", " + radius + ") rotate(270)" });
}
function buildNeedlePath(value, range, cx, cy, min, max, radius) {
if (value > max) {
value = max;
}
var delta = range / 1;
var tailValue = value - (range * (1/(270/360)) / 2);
var head = centerPoint(valueToPoint(value, 0.8, min, max, radius), cx, cy);
var head1 = centerPoint(valueToPoint(value - delta, 0.12, min, max, radius), cx, cy);
var head2 = centerPoint(valueToPoint(value + delta, 0.12, min, max, radius), cx, cy);
var tail = centerPoint(valueToPoint(tailValue, 0, min, max, radius), cx, cy);
var tail1 = centerPoint(valueToPoint(tailValue - delta, 0.12, min, max, radius), cx, cy);
var tail2 = centerPoint(valueToPoint(tailValue + delta, 0.12, min, max, radius), cx, cy);
function centerPoint(point, cx, cy) {
point.x -= cx;
point.y -= cy;
return point;
}
return [head, head1, tail2, tail, tail1, head2, head];
}
function valueToDegrees(value, min, max) {
range = max - min;
return value / range * 270 - (min / range * 270 + 45);
}
function valueToRadians(value, min, max) {
return valueToDegrees(value, min, max) * Math.PI / 180;
}
function valueToPoint(value, factor, min, max, radius) {
return {
x: cx - radius * factor * Math.cos(valueToRadians(value, min, max)),
y: cy - radius * factor * Math.sin(valueToRadians(value, min, max))
};
}
});
renderWatch.renderEnd('gauge immediate');
return chart;
}
//============================================================
// Expose Public Variables
//------------------------------------------------------------
chart.dispatch = dispatch;
chart.options = nv.utils.optionsFunc.bind(chart);
chart._options = Object.create({}, {
// simple options, just get/set the necessary values
width: {get: function(){return width;}, set: function(_){width=_;}},
height: {get: function(){return height;}, set: function(_){height=_;}},
title: {get: function(){return title;}, set: function(_){title=_;}},
showMinMaxLabels: {get: function(){return showMinMaxLabels;}, set: function(_){showMinMaxLabels=_;}},
valueFormat: {get: function(){return valueFormat;}, set: function(_){valueFormat=_;}},
id: {get: function(){return id;}, set: function(_){id=_;}},
min: {get: function(){return min;}, set: function(_){min=_;}},
max: {get: function(){return max;}, set: function(_){max=_;}},
zoneLimit1: {get: function(){return zoneLimit1;}, set: function(_){zoneLimit1=_;}},
zoneLimit2: {get: function(){return zoneLimit2;}, set: function(_){zoneLimit2=_;}},
// options that require extra logic in the setter
margin: {get: function(){return margin;}, set: function(_){
margin.top = typeof _.top != 'undefined' ? _.top : margin.top;
margin.right = typeof _.right != 'undefined' ? _.right : margin.right;
margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
margin.left = typeof _.left != 'undefined' ? _.left : margin.left;
}},
color: {get: function(){return color;}, set: function(_){
color=nv.utils.getColor(_);
}}
});
nv.utils.initOptions(chart);
return chart;
};