BBnepal-Accounts/account/theme/pages/plugins/sparklines/sparkline.mjs
Sampanna Rimal 9cd05ef3cb commitall
2024-07-10 18:28:19 +05:45

180 lines
5.9 KiB
JavaScript

export default class Sparkline {
constructor(element, options = {}) {
this.element = element;
this.options = { ...Sparkline.options, ...options };
init: {
this.element.innerHTML = "<canvas></canvas>";
this.canvas = this.element.firstChild;
this.context = this.canvas.getContext("2d");
this.ratio = window.devicePixelRatio || 1;
if (this.options.tooltip) {
this.canvas.style.position = "relative";
this.canvas.addEventListener('mousemove', e => {
const x = e.offsetX || e.layerX || 0;
const delta = ((this.options.width - this.options.dotRadius * 2) / (this._points.length - 1));
const index = minmax(0, Math.round((x - this.options.dotRadius) / delta), this._points.length - 1);
this.canvas.title = this.options.tooltip(this._points[index], index, this._points);
}, false);
}
}
}
set points(points) {
this.draw(points);
}
get points() {
return this._points;
}
draw(points = []) {
this._points = points;
this.canvas.width = this.options.width * this.ratio;
this.canvas.style.width = `${this.options.width}px`;
const pxHeight = this.options.height || this.element.offsetHeight;
this.canvas.height = pxHeight * this.ratio;
this.canvas.style.height = `${pxHeight}px`;
const lineWidth = this.options.lineWidth * this.ratio;
const offsetX = Math.max(this.options.dotRadius * this.ratio, lineWidth / 2);
const offsetY = Math.max(this.options.dotRadius * this.ratio, lineWidth / 2);
const width = this.canvas.width - offsetX * 2;
const height = this.canvas.height - offsetY * 2;
const minValue = Math.min.apply(Math, points);
const maxValue = Math.max.apply(Math, points);
const bottomValue = this.options.minValue != undefined ? this.options.minValue : Math.min(minValue, this.options.maxMinValue != undefined ? this.options.maxMinValue : minValue);
const topValue = this.options.maxValue != undefined ? this.options.maxValue : Math.max(maxValue, this.options.minMaxValue != undefined ? this.options.minMaxValue : maxValue);
let minX = offsetX;
let maxX = offsetX;
let x = offsetX;
const y = index => (topValue === bottomValue)
? offsetY + height / 2
: (offsetY + height) - ((points[index] - bottomValue) / (topValue - bottomValue)) * height;
const delta = width / (points.length - 1);
const line = (style, x, y) => {
if (!style) return;
this.context.save();
this.context.strokeStyle = style.color || 'black';
this.context.lineWidth = (style.width || 1) * this.ratio;
this.context.globalAlpha = style.alpha || 1;
this.context.beginPath();
this.context.moveTo(style.direction != 'right' ? offsetX : x, y);
this.context.lineTo(style.direction != 'left' ? width + offsetX : x, y);
this.context.stroke();
this.context.restore();
}
const dot = (color, lineStyle, x, y) => {
this.context.beginPath();
this.context.fillStyle = color;
this.context.arc(x, y, this.options.dotRadius * this.ratio, 0, Math.PI * 2, false);
this.context.fill();
line(lineStyle, x, y);
}
this.context.save();
this.context.strokeStyle = this.options.lineColor;
this.context.fillStyle = this.options.lineColor;
this.context.lineWidth = lineWidth;
this.context.lineCap = 'round';
this.context.lineJoin = 'round';
if (this.options.fillBelow && points.length > 1) {
this.context.save();
this.context.beginPath();
this.context.moveTo(x, y(0));
for (let i = 1; i < points.length; i++) {
x += delta;
minX = points[i] == minValue ? x : minX;
maxX = points[i] == maxValue ? x : maxX;
this.context.lineTo(x, y(i));
}
this.context.lineTo(width + offsetX, height + offsetY + lineWidth / 2);
this.context.lineTo(offsetX, height + offsetY + lineWidth / 2);
this.context.fill();
if (this.options.fillLighten > 0) {
this.context.fillStyle = 'white';
this.context.globalAlpha = this.options.fillLighten;
this.context.fill();
this.context.globalAlpha = 1;
} else if (this.options.fillLighten < 0) {
this.context.fillStyle = 'black';
this.context.globalAlpha = -this.options.fillLighten;
this.context.fill();
}
this.context.restore();
}
x = offsetX;
this.context.beginPath();
this.context.moveTo(x, y(0));
for (let i = 1; i < points.length; i++) {
x += delta;
this.context.lineTo(x, y(i));
}
this.context.stroke();
this.context.restore();
line(this.options.bottomLine, 0, offsetY);
line(this.options.topLine, 0, height + offsetY + lineWidth / 2);
dot(this.options.startColor, this.options.startLine, offsetX + (points.length == 1 ? width / 2 : 0), y(0));
dot(this.options.endColor, this.options.endLine, offsetX + (points.length == 1 ? width / 2 : width), y(points.length - 1));
dot(this.options.minColor, this.options.minLine, minX + (points.length == 1 ? width / 2 : 0), y(points.indexOf(minValue)));
dot(this.options.maxColor, this.options.maxLine, maxX + (points.length == 1 ? width / 2 : 0), y(points.indexOf(maxValue)));
}
static init(element, options) {
return new Sparkline(element, options);
}
static draw(element, points, options) {
const sparkline = new Sparkline(element, options);
sparkline.draw(points);
return sparkline;
}
}
Sparkline.options = {
width: 100,
height: null,
lineColor: "black",
lineWidth: 1.5,
startColor: "transparent",
endColor: "black",
maxColor: "transparent",
minColor: "transparent",
minValue: null,
maxValue: null,
minMaxValue: null,
maxMinValue: null,
dotRadius: 2.5,
tooltip: null,
fillBelow: true,
fillLighten: 0.5,
startLine: false,
endLine: false,
minLine: false,
maxLine: false,
bottomLine: false,
topLine: false,
averageLine: false
};
function minmax(a, b, c) {
return Math.max(a, Math.min(b, c));
}