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273 lines
9.1 KiB
JavaScript
273 lines
9.1 KiB
JavaScript
nv.models.legend = function() {
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"use strict";
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//============================================================
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// Public Variables with Default Settings
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//------------------------------------------------------------
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var margin = {top: 5, right: 0, bottom: 5, left: 0}
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, width = 400
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, height = 20
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, getKey = function(d) { return d.key }
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, color = nv.utils.defaultColor()
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, align = true
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, rightAlign = true
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, updateState = true //If true, legend will update data.disabled and trigger a 'stateChange' dispatch.
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, radioButtonMode = false //If true, clicking legend items will cause it to behave like a radio button. (only one can be selected at a time)
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, dispatch = d3.dispatch('legendClick', 'legendDblclick', 'legendMouseover', 'legendMouseout', 'stateChange')
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;
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//============================================================
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function chart(selection) {
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selection.each(function(data) {
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var availableWidth = width - margin.left - margin.right,
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container = d3.select(this);
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//------------------------------------------------------------
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// Setup containers and skeleton of chart
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var wrap = container.selectAll('g.nv-legend').data([data]);
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var gEnter = wrap.enter().append('g').attr('class', 'nvd3 nv-legend').append('g');
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var g = wrap.select('g');
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wrap.attr('transform', 'translate(' + margin.left + ',' + margin.top + ')');
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//------------------------------------------------------------
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var series = g.selectAll('.nv-series')
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.data(function(d) { return d });
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var seriesEnter = series.enter().append('g').attr('class', 'nv-series')
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.on('mouseover', function(d,i) {
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dispatch.legendMouseover(d,i); //TODO: Make consistent with other event objects
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})
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.on('mouseout', function(d,i) {
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dispatch.legendMouseout(d,i);
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})
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.on('click', function(d,i) {
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dispatch.legendClick(d,i);
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if (updateState) {
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if (radioButtonMode) {
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//Radio button mode: set every series to disabled,
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// and enable the clicked series.
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data.forEach(function(series) { series.disabled = true});
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d.disabled = false;
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}
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else {
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d.disabled = !d.disabled;
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if (data.every(function(series) { return series.disabled})) {
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//the default behavior of NVD3 legends is, if every single series
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// is disabled, turn all series' back on.
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data.forEach(function(series) { series.disabled = false});
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}
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}
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dispatch.stateChange({
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disabled: data.map(function(d) { return !!d.disabled })
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});
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}
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})
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.on('dblclick', function(d,i) {
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dispatch.legendDblclick(d,i);
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if (updateState) {
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//the default behavior of NVD3 legends, when double clicking one,
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// is to set all other series' to false, and make the double clicked series enabled.
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data.forEach(function(series) {
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series.disabled = true;
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});
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d.disabled = false;
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dispatch.stateChange({
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disabled: data.map(function(d) { return !!d.disabled })
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});
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}
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});
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seriesEnter.append('circle')
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.style('stroke-width', 2)
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.attr('class','nv-legend-symbol')
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.attr('r', 5);
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seriesEnter.append('text')
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.attr('text-anchor', 'start')
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.attr('class','nv-legend-text')
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.attr('dy', '.32em')
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.attr('dx', '8');
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series.classed('disabled', function(d) { return d.disabled });
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series.exit().remove();
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series.select('circle')
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.style('fill', function(d,i) { return d.color || color(d,i)})
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.style('stroke', function(d,i) { return d.color || color(d, i) });
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series.select('text').text(getKey);
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//TODO: implement fixed-width and max-width options (max-width is especially useful with the align option)
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// NEW ALIGNING CODE, TODO: clean up
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if (align) {
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var seriesWidths = [];
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series.each(function(d,i) {
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var legendText = d3.select(this).select('text');
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var nodeTextLength;
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try {
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nodeTextLength = legendText.getComputedTextLength();
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// If the legendText is display:none'd (nodeTextLength == 0), simulate an error so we approximate, instead
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if(nodeTextLength <= 0) throw Error();
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}
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catch(e) {
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nodeTextLength = nv.utils.calcApproxTextWidth(legendText);
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}
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seriesWidths.push(nodeTextLength + 28); // 28 is ~ the width of the circle plus some padding
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});
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var seriesPerRow = 0;
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var legendWidth = 0;
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var columnWidths = [];
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while ( legendWidth < availableWidth && seriesPerRow < seriesWidths.length) {
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columnWidths[seriesPerRow] = seriesWidths[seriesPerRow];
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legendWidth += seriesWidths[seriesPerRow++];
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}
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if (seriesPerRow === 0) seriesPerRow = 1; //minimum of one series per row
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while ( legendWidth > availableWidth && seriesPerRow > 1 ) {
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columnWidths = [];
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seriesPerRow--;
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for (var k = 0; k < seriesWidths.length; k++) {
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if (seriesWidths[k] > (columnWidths[k % seriesPerRow] || 0) )
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columnWidths[k % seriesPerRow] = seriesWidths[k];
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}
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legendWidth = columnWidths.reduce(function(prev, cur, index, array) {
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return prev + cur;
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});
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}
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var xPositions = [];
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for (var i = 0, curX = 0; i < seriesPerRow; i++) {
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xPositions[i] = curX;
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curX += columnWidths[i];
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}
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series
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.attr('transform', function(d, i) {
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return 'translate(' + xPositions[i % seriesPerRow] + ',' + (5 + Math.floor(i / seriesPerRow) * 20) + ')';
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});
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//position legend as far right as possible within the total width
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if (rightAlign) {
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g.attr('transform', 'translate(' + (width - margin.right - legendWidth) + ',' + margin.top + ')');
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}
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else {
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g.attr('transform', 'translate(0' + ',' + margin.top + ')');
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}
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height = margin.top + margin.bottom + (Math.ceil(seriesWidths.length / seriesPerRow) * 20);
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} else {
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var ypos = 5,
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newxpos = 5,
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maxwidth = 0,
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xpos;
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series
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.attr('transform', function(d, i) {
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var length = d3.select(this).select('text').node().getComputedTextLength() + 28;
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xpos = newxpos;
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if (width < margin.left + margin.right + xpos + length) {
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newxpos = xpos = 5;
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ypos += 20;
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}
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newxpos += length;
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if (newxpos > maxwidth) maxwidth = newxpos;
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return 'translate(' + xpos + ',' + ypos + ')';
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});
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//position legend as far right as possible within the total width
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g.attr('transform', 'translate(' + (width - margin.right - maxwidth) + ',' + margin.top + ')');
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height = margin.top + margin.bottom + ypos + 15;
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}
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});
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return chart;
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}
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//============================================================
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// Expose Public Variables
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//------------------------------------------------------------
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chart.dispatch = dispatch;
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chart.options = nv.utils.optionsFunc.bind(chart);
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chart.margin = function(_) {
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if (!arguments.length) return margin;
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margin.top = typeof _.top != 'undefined' ? _.top : margin.top;
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margin.right = typeof _.right != 'undefined' ? _.right : margin.right;
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margin.bottom = typeof _.bottom != 'undefined' ? _.bottom : margin.bottom;
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margin.left = typeof _.left != 'undefined' ? _.left : margin.left;
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return chart;
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};
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chart.width = function(_) {
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if (!arguments.length) return width;
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width = _;
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return chart;
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};
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chart.height = function(_) {
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if (!arguments.length) return height;
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height = _;
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return chart;
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};
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chart.key = function(_) {
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if (!arguments.length) return getKey;
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getKey = _;
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return chart;
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};
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chart.color = function(_) {
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if (!arguments.length) return color;
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color = nv.utils.getColor(_);
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return chart;
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};
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chart.align = function(_) {
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if (!arguments.length) return align;
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align = _;
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return chart;
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};
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chart.rightAlign = function(_) {
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if (!arguments.length) return rightAlign;
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rightAlign = _;
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return chart;
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};
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chart.updateState = function(_) {
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if (!arguments.length) return updateState;
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updateState = _;
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return chart;
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};
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chart.radioButtonMode = function(_) {
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if (!arguments.length) return radioButtonMode;
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radioButtonMode = _;
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return chart;
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};
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//============================================================
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return chart;
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}
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