您好我想创建一个如下所示的动态图表:phases in line chart
ChartJs是否可以在某些里程碑处创建垂直线? (如果可能的话,也给每个阶段另一种颜色)
如果没有,其他哪些库可以处理支持阶段的动态折线图库?
答案 0 :(得分:1)
使用Chart.js plugins可以帮助您解决此问题。它们允许您处理在图表创建期间触发的特定事件,例如beforeInit
,afterUpdate
或afterDraw
,并且也易于实施:
var myPlugin = {
afterDraw: function(chart) {
// This will be triggered after the chart is drawn
}
};
Chart.pluginService.register(myPlugin);
<小时/> 一个插件正在寻找你正在寻找的插件将在下面链接,但首先让我解释它是如何工作的。
在图表选项中,您需要添加一个名为phases
的新属性,该属性是一个数组:
// The following is an example that won't work with every chart
options: {
scales: {
xAxes: [{
// `from` & `to` must exist in your xAxe ticks
phases: [{
from: "January",
to: "March",
// You can also define the color here
color: "blue"
},
{
from: "May",
to: "June",
color: "red"
}]
}]
}
}
然后,这是使用此信息的插件:
var phasePlugin = {
// You need to handle the `afterDraw` event since you draw phases edges
// after everything is drawn
afterDraw: function(chart)
{
// All the variables the plugin needs follow ...
var ctx = chart.chart.ctx;
var xAxeId = chart.config.options.scales.xAxes[0].id;
var xAxe = chart.scales[xAxeId];
var yAxeId = chart.config.options.scales.yAxes[0].id;
var yAxe = chart.scales[yAxeId];
var ticks = xAxe.ticks;
var phases = chart.config.options.scales.xAxes[0].phases;
// For every phase ...
for (var i = 0; i < phases.length; i++) {
// We check if the tick actually exists
if (ticks.indexOf(phases[i].from) == -1 || (ticks.indexOf(phases[i].to) == -1)) {
// Else, we skip to the next phase
continue;
}
// We get the x position of the first limit tick
var xPos = ((xAxe.width - xAxe.paddingRight) / xAxe.maxIndex) * ticks.indexOf(phases[i].from) + xAxe.left + 1;
// And draw the dashed line
ctx.setLineDash([8, 8]);
ctx.strokeStyle = phases[i].color;
ctx.strokeRect(xPos, yAxe.top, 0, yAxe.height);
// Same for the other limit
xPos = ((xAxe.width - xAxe.paddingRight) / xAxe.maxIndex) * ticks.indexOf(phases[i].to) + xAxe.left + 1;
ctx.strokeStyle = phases[i].color;
ctx.strokeRect(xPos, yAxe.top, 0, yAxe.height);
ctx.setLineDash([1,0]);
}
}
};
您可以看到一个完整的示例in this jsFiddle,结果如下: