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[Chart.js] y축 vertical line 생성하기
[방법 1] 단일 y축 vertical line 생성
1-1. HTML (Canvas 생성)
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var data = {
labels: ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"],
datasets: [{
data: [12, 3, 2, 1, 8, 8, 2, 2, 3, 5, 7, 1]
}]
};
var ctx = document.getElementById("LineWithLine").getContext("2d");
Chart.types.Line.extend({
name: "LineWithLine",
draw: function() {
Chart.types.Line.prototype.draw.apply(this, arguments);
var point = this.datasets[0].points[this.options.lineAtIndex]
var scale = this.scale
// draw line
this.chart.ctx.beginPath();
this.chart.ctx.moveTo(point.x, scale.startPoint + 24);
this.chart.ctx.strokeStyle = '#ff0000';
this.chart.ctx.lineTo(point.x, scale.endPoint);
this.chart.ctx.stroke();
// write TODAY
this.chart.ctx.textAlign = 'center';
this.chart.ctx.fillText("TODAY", point.x, scale.startPoint + 12);
}
});
new Chart(ctx).LineWithLine(data, {
datasetFill: false,
lineAtIndex: 2
});
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[방법 2] 다중 y축 vertical line 생성
2-1. HTML (Canvas 생성)
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<canvas id="LineWithLine" width="600" height="400"></canvas>
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2-2. Script (Chart.js 생성)
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monthList = ["JAN", "FEB", "MAR", "APR", "MAY", "JUN", "JUL", "AUG", "SEP", "OCT", "NOV", "DEC"]
monthValue = [12, 3, 2, 1, 8, 8, 2, 2, 3, 5, 7, 1]
var data = {
labels: monthList,
datasets: [{
label: '가용가액 [단위:백만원]',
backgroundColor: 'rgba(255, 94, 0, 0)',
borderColor: 'rgba(47, 157, 39, 1)',
data: monthValue
}]
};
const verticalLinePlugin = {
getLinePosition: function (chart, pointIndex) {
const meta = chart.getDatasetMeta(0); // first dataset is used to discover X coordinate of a point
const data = meta.data;
return data[pointIndex]._model.x;
},
renderVerticalLine: function (chartInstance, pointIndex) {
const lineLeftOffset = this.getLinePosition(chartInstance, pointIndex);
const scale = chartInstance.scales['y-axis-0'];
const context = chartInstance.chart.ctx;
// render vertical line
context.beginPath();
context.strokeStyle = '#ff0000';
context.moveTo(lineLeftOffset, scale.top + 20);
context.lineTo(lineLeftOffset, scale.bottom);
context.stroke();
// write label
context.fillStyle = "#ff0000";
context.textAlign = 'center';
context.fillText('CHECK POINT', lineLeftOffset, scale.top + 10);
},
afterDatasetsDraw: function (chart, easing) {
if (chart.config.lineAtIndex) {
chart.config.lineAtIndex.forEach(pointIndex => this.renderVerticalLine(chart, pointIndex));
}
}
};
Chart.plugins.register(verticalLinePlugin);
new Chart('LineWithLine' , {
type: 'line',
data: data,
label: 'Progress',
options: options,
lineAtIndex: [1,5,8],
})
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