我正在生成一个 Chart.JS 条形图,呈现如下:
如您所见,图例的底部和网格/图表的顶部挤在一起。此外,各个条形图被挤在一起,超出了绝对必要的程度,使得这些值有点难以阅读;请注意,红色条左侧和蓝色条右侧有足够的空间。象限本身有足够的空间来在图例和网格/图形之间添加一个 shim 或 shiv 空间。
我怎样才能“消除”这些元素以使数据更清晰、演示更吸引人?
这是正在使用的代码:
HTML
<div class="row">
<div class="col-md-6">
<div class="bottomleft">
<h2 class="sectiontext">Forecast/Impact Analysis</h2>
<div class="graph_container">
<canvas id="forecastLineChart"></canvas>
</div>
</div>
</div>
. . .
CSS
“row”和“col-md-6”类是 Bootstrap。“graph_container”必须是 Chart.JS 类(它不是我的类)。
.bottomleft {
margin-left: 16px;
padding: 16px;
border: 1px solid black;
}
.sectiontext {
font-size: 1.5em;
font-weight: bold;
font-family: Candara, Calibri, Cambria, serif;
color: green;
margin-top: -4px;
}
JAVASCRIPT/jQuery
var ctxForecastChart = $("#forecastLineChart");
var forecastChartData = {
labels: ["Total Sales"],
datasets: [
{
label: "8/28/2016 - 9/3/2016",
backgroundColor: "rgba(255,0,0,0.75)",
hoverBackgroundColor: "rgba(255,0,0,1)",
data: [1631437.17]
},
{
label: "9/4/2016 - 9/10/2016",
backgroundColor: "rgba(255,153,0,0.75)",
hoverBackgroundColor: "rgba(255,153,0,1)",
data: [1523898.94]
},
{
label: "9/11/2016 - 9/17/2016",
backgroundColor: "rgba(255,255,0,0.75)",
hoverBackgroundColor: "rgba(255,255,0,1)",
data: [1755669.93]
},
{
label: "9/18/2016 - 9/24/2016",
backgroundColor: "rgba(0,255,0,0.75)",
hoverBackgroundColor: "rgba(0,255,0,1)",
data: [1873205.42]
},
{
label: "9/25/2016 - 10/1/2016",
backgroundColor: "rgba(0,0,255,0.75)",
hoverBackgroundColor: "rgba(0,0,255,1)",
data: [1838204.79]
}]
};
var forecastOptions = {
tooltips: {
enabled: true
},
animation: {
duration: 500,
easing: "easeOutQuart",
onComplete: function () {
var ctx = this.chart.ctx;
ctx.font
Chart.helpers.fontString(Chart.defaults.global.defaultFontFamily, 'normal'
Chart.defaults.global.defaultFontFamily);
ctx.textAlign = 'center';
ctx.textBaseline = 'bottom';
this.data.datasets.forEach(function (dataset) {
for (var i = 0; i < dataset.data.length; i++) {
var model = dataset._meta[Object.keys(dataset._met
[0]].data[i]._model, scale_max = dataset._meta[Object.keys(dataset._met
[0]].data[i]._yScale.maxHeight;
ctx.fillStyle = '#444';
var y_pos = model.y - 5;
if ((scale_max - model.y) / scale_max >= 0.93)
y_pos = model.y + 20;
ctx.fillText(addCommas(dataset.data[i]), model.x
y_pos);
}
});
}
}
};
var forecastBarChart = new Chart(ctxForecastChart, {
type: 'bar',
data: forecastChartData,
options: forecastOptions
});
更新
这不是一个完整的解决方案,但我以这种方式改进了它:
<canvas id="forecastLineChart" height="190"></canvas>
IOW,我将高度值添加到画布,以便网格/图形现在更好地填充象限:
也许,它可以使用逗号作为 y 轴编号,但条形可以在水平方向上展开得更多。