/**
* A bar chart. Required data format:
* [ { name : x-axis-bar-label, value : N }, ...]
*
* Sample use:
* var bargraph = d3.select('#bargraph')
* .append('svg')
* .chart('BarChart')
* .yFormat(d3.format("d"))
* .height(400)
* .width(800)
* .max(1.0);
* bargraph.draw(bardata);
*/
d3.chart('BarChart', {
initialize: function() {
var chart = this;
// chart margins to account for labels.
// we may want to have setters for this.
// not sure how necessary that is tbh.
chart.margins = {
top : 10,
bottom : 15,
left : 50,
right : 0,
padding : 10
};
// default chart ranges
chart.x = d3.scale.linear();
chart.y = d3.scale.linear();
chart.base
.classed('Barchart', true);
// non data driven areas (as in not to be independatly drawn)
chart.areas = {};
// cache for selections that are layer bases.
chart.layers = {};
// make sections for labels and main area
// _________________
// |Y| bars |
// | | |
// | | |
// | | |
// | |______________|
// | X |
// -- areas
chart.areas.ylabels = chart.base.append('g')
.classed('ylabels', true)
.attr('width', chart.margins.left)
.attr('transform',
'translate('+(chart.margins.left-1)+','+(chart.margins.top + 1)+')');
// -- actual layers
chart.layers.bars = chart.base.append('g')
.classed('bars', true)
.attr('transform',
'translate(' + chart.margins.left + ',' + (chart.margins.top + 1)+')');
chart.layers.xlabels = chart.base.append('g')
.classed('xlabels', true)
.attr('height', chart.margins.bottom);
chart.on("change:width", function() {
chart.x.range([0, chart.w - chart.margins.left]);
chart.layers.bars.attr('width', chart.w - chart.margins.left);
chart.layers.xlabels.attr('width', chart.w - chart.margins.left);
});
chart.on("change:height", function() {
chart.y.range([chart.h - chart.margins.bottom - chart.margins.top, 0]);
chart.areas.ylabels
.attr('height', chart.h - chart.margins.bottom - chart.margins.top - 1);
chart.layers.bars
.attr('height', chart.h - chart.margins.bottom - chart.margins.top);
chart.layers.xlabels
.attr('transform', 'translate(' + chart.margins.left + ',' +
(chart.h - chart.margins.bottom + 1) + ')');
});
// make actual layers
chart.layer('bars', chart.layers.bars, {
// data format:
// [ { name : x-axis-bar-label, value : N }, ...]
dataBind : function(data) {
chart.data = data;
// how many bars?
chart.bars = data.length;
// compute box size
chart.bar_width = (chart.w - chart.margins.left - ((chart.bars - 1) *
chart.margins.padding)) / chart.bars;
// adjust the x domain - the number of bars.
chart.x.domain([0, chart.bars]);
// adjust the y domain - find the max in the data.
chart.datamax = chart.usermax ||
d3.extent(data, function(d) { return d.value; })[1];
chart.y.domain([0, chart.datamax]);
// draw yaxis
var yAxis = d3.svg.axis()
.scale(chart.y)
.orient('left')
.ticks(5)
.tickFormat(chart._yformat || d3.format('.0%'));
chart.areas.ylabels
.call(yAxis);
return this.selectAll('rect')
.data(data, function(d) {
//console.log(d);
return d.name;
});
},
insert : function() {
return this.append('rect')
.classed('bar', true)
.classed('highlight', function(d) {
return d.highlight;
});
},
events: {
exit: function() {
this.remove();
}
}
});
// a layer for the x text labels.
chart.layer('xlabels', chart.layers.xlabels, {
dataBind : function(data) {
// first append a line to the top.
this.append('line')
.attr('x1', 0)
.attr('x2', chart.w - chart.margins.left)
.attr('y1', 0)
.attr('y2', 0)
.style('stroke', '#222')
.style('stroke-width', '1')
.style('shape-rendering', 'crispEdges');
return this.selectAll('text')
.data(data, function(d) { return d.name; });
},
insert : function() {
return this.append('text')
.classed('label', true)
.attr('text-anchor', 'middle')
.attr('x', function(d, i) {
return chart.x(i) - 0.5 + chart.bar_width/2;
})
.attr('dy', '1em')
.text(function(d) {
return d.name;
});
},
events: {
exit: function() {
this.remove();
}
}
});
// on new/update data
// render the bars.
var onEnter = function() {
this.attr('x', function(d, i) {
return chart.x(i) - 0.5;
})
.attr('y', function(d) {
return chart.h - chart.margins.bottom -
chart.margins.top - chart.y(chart.datamax - d.value) - 0.5;
})
.attr('val', function(d) {
return d.value;
})
.attr('width', chart.bar_width)
.attr('height', function(d) {
return chart.y(chart.datamax - d.value);
});
};
chart.layer('bars').on('enter', onEnter);
chart.layer('bars').on('update', onEnter);
},
// return or set the max of the data. otherwise
// it will use the data max.
max : function(datamax) {
if (!arguments.length) {
return this.usermax;
}
this.usermax = datamax;
if (this.data) this.draw(this.data);
return this;
},
yFormat: function(format) {
if (!arguments.length) {
return this._yformat;
}
this._yformat = format;
return this;
},
width : function(newWidth) {
if (!arguments.length) {
return this.w;
}
// save new width
this.w = newWidth;
// adjust the x scale range
this.x.range([this.margins.left, this.w - this.margins.right]);
// adjust the base width
this.base.attr('width', this.w);
this.trigger("change:width");
if (this.data) this.draw(this.data);
return this;
},
height : function(newHeight) {
if (!arguments.length) {
return this.h;
}
// save new height
this.h = newHeight;
// adjust the y scale
this.y.range([this.h - this.margins.top, this.margins.bottom]);
// adjust the base width
this.base.attr('height', this.h);
this.trigger("change:height");
if (this.data) this.draw(this.data);
return this;
}
});
var barchart = d3.select('#vis')
.append('svg')
.chart('BarChart') //**Moving transform position out of here**
.yFormat(d3.format("d"))
.height(400)
.width(800);
var data = [
{ month : 'January', temperature : 29 },
{ month : 'February', temperature : 32 },
{ month : 'March', temperature : 48 },
{ month : 'April', temperature : 49 },
{ month : 'May', temperature : 58 },
{ month : 'June', temperature : 68 },
{ month : 'July', temperature : 74 },
{ month : 'August', temperature : 73 },
{ month : 'September', temperature : 65 },
{ month : 'October', temperature : 54 },
{ month : 'November', temperature : 45 },
{ month : 'December', temperature : 35 }
];
//**Moving transform function out of barchart definition
//so it is called only once and not everytime
//the chart is redrawn**
function transform(data) {
return data.map(function(d) {
return { name : d.month, value : d.temperature };
});
}
barchart.draw(transform(data));
在这个小提琴中，我试图以百分比显示y轴值。不完全从数据计算百分比，而只是将“％”符号附加到现有数据。我通过实际代码中的数组获取数据，它是动态的。我尝试使用刻度格式附加，但不知何故它似乎不起作用。有什么帮助吗？
答案 0 :(得分：1)
这样做可以将％附加到y刻度：
var yAxis = d3.svg.axis()
.scale(chart.y)
.orient('left')
.ticks(5)
.tickFormat(function(d){return d+ "%"});
工作代码here