117 lines
3.6 KiB
JavaScript
117 lines
3.6 KiB
JavaScript
class FreeBedsChartView {
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#canvas;
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#chart;
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constructor(canvas) {
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this.#canvas = canvas;
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}
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displayChart({ data, title }) {
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if (this.#chart != null) {
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this.#chart.destroy();
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}
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this.#chart = new Chart(
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this.#canvas,
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{
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type: 'line',
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data: this.#getData(data),
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options: this.#getOptions(title),
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plugins: [this.#getBackgroundTrafficLightsPlugin()]
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});
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}
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#getBackgroundTrafficLightsPlugin() {
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function fillRect({ chart, startInPercent, endInPercent, color }) {
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const ctx = chart.ctx;
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const chartArea = chart.chartArea;
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const chartWidth = chartArea.right - chartArea.left;
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const chartHeight = chartArea.bottom - chartArea.top
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const y = chartArea.bottom - chartHeight * endInPercent / 100;
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const height = chartHeight * (endInPercent - startInPercent) / 100;
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ctx.fillStyle = color;
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ctx.fillRect(chartArea.left, y, chartWidth, height);
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}
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function drawTrafficLights(chart) {
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const RED = 'rgba(240, 59, 32, 0.75)';
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const YELLOW = 'rgba(254, 178, 76, 0.75)';
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const GREEN = 'rgba(56, 168, 0, 0.75)';
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chart.ctx.save();
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fillRect({ chart: chart, startInPercent: 0, endInPercent: 10, color: RED });
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fillRect({ chart: chart, startInPercent: 10, endInPercent: 25, color: YELLOW });
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fillRect({ chart: chart, startInPercent: 25, endInPercent: 100, color: GREEN });
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chart.ctx.restore();
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}
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return { beforeDraw: drawTrafficLights };
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}
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#getData(data) {
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return {
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datasets: [
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{
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label: 'Anteil freier Betten',
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data: data,
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parsing: {
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yAxisKey: 'free_beds_divided_by_all_beds_in_percent'
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},
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backgroundColor: 'rgba(0, 0, 150, 1)'
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}
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]
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};
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}
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#getOptions(title) {
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return {
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plugins: {
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title: {
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display: true,
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text: title
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},
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tooltip: {
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callbacks: {
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label: function (context) {
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let label = context.dataset.label || '';
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if (label) {
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label += ': ';
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}
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if (context.parsed.y !== null) {
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label += context.parsed.y.toFixed(1) + "%";
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}
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return label;
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}
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}
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}
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},
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responsive: true,
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scales: {
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x: {
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type: 'time',
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time: {
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tooltipFormat: 'DD.MM.YYYY',
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unit: 'month',
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displayFormats: {
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'month': 'MMM YYYY'
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}
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}
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},
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y: {
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min: 0,
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max: 100,
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title: {
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display: true,
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text: "Anteil freier Betten"
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},
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ticks: {
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callback: value => value + "%"
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}
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}
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},
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parsing: {
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xAxisKey: 'date'
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}
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};
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}
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} |