dozee-ecg-chart
Version:
A library for drawing ECG charts with real-time data
217 lines • 28.1 kB
JavaScript
import { Component, Input } from '@angular/core';
import { Chart, CategoryScale, LinearScale, LineController, LineElement, PointElement, Title, Tooltip, Legend, } from 'chart.js';
import * as i0 from "@angular/core";
export class DozeeEcgChartComponent {
renderer;
ngZone;
accessToken;
userId;
stage;
strokeColor = '#00ff00';
backgroundColor = '#000000';
eventSource = null;
buffer = [];
chart;
frequency = 256; // Hz
duration = 8; // seconds
maxPoints = this.frequency * this.duration; // 2048 points
ecgData = Array(this.maxPoints).fill(null);
bufferLimit = 64 * 64;
isPageActive = true;
intervalId;
inactivityTimeout; // Timer to track inactivity
INACTIVE_DELAY = 30000;
RETRY_DELAY = 6000;
constructor(renderer, ngZone) {
this.renderer = renderer;
this.ngZone = ngZone;
}
ngOnInit() {
// Register necessary chart components
Chart.register(CategoryScale, LinearScale, LineController, LineElement, PointElement, Title, Tooltip, Legend);
const ctx = document.getElementById('ecgChart');
ctx.style.backgroundColor = this.backgroundColor;
this.chart = new Chart(ctx, {
type: 'line',
data: {
labels: Array(this.maxPoints).fill(0.0), // Empty labels as X axis is fixed
datasets: [
{
label: 'ECG Data',
data: this.ecgData,
borderColor: this.strokeColor,
borderWidth: 1,
fill: false,
pointRadius: 0, // Hide points for smooth line
},
],
},
options: {
animation: false,
responsive: true,
maintainAspectRatio: false,
scales: {
x: {
type: 'linear',
min: 0,
max: this.maxPoints, // Set fixed X-axis range (8 seconds)
display: false, // Hide the x-axis
grid: { display: false },
},
y: {
max: 4000, // Adjust based on ECG value range
min: 0,
type: 'linear',
beginAtZero: true,
grid: { display: false },
display: false,
},
},
plugins: {
legend: {
display: false,
},
},
elements: {
line: {
tension: 0.4,
},
},
},
});
// Initialize SSE connection
this.initializeSse();
this.renderer.listen('document', 'visibilitychange', () => {
if (document.hidden) {
console.log('Page became inactive, starting 30s timeout...');
this.startInactivityTimer();
}
else {
console.log('Page is active again, canceling inactivity timeout');
this.cancelInactivityTimer();
this.startInterval();
}
});
// Start interval initially
this.startInterval();
}
startInterval() {
if (!this.intervalId) {
// Update chart data at regular intervals
this.intervalId = setInterval(() => {
if (this.buffer.length > this.bufferLimit && this.currentIndex === 0) {
if (this.stage === 'sit') {
console.warn(`Buffer overflow: Skipping ${this.buffer.length - 64} old entries`);
}
this.buffer.splice(0, this.buffer.length - 64);
}
if (this.buffer.length > 0) {
const entry = this.buffer.shift();
for (const e of entry) {
this.addData(e);
}
}
}, 16); // Update frequency (256 Hz)
}
}
startInactivityTimer() {
this.inactivityTimeout = setTimeout(() => {
console.log('Page has been inactive for 30 seconds, stopping updates.');
this.isPageActive = false;
this.clearInterval();
}, this.INACTIVE_DELAY);
}
cancelInactivityTimer() {
if (this.inactivityTimeout) {
clearTimeout(this.inactivityTimeout);
this.inactivityTimeout = null;
}
this.isPageActive = true;
}
clearInterval() {
if (this.intervalId) {
clearInterval(this.intervalId);
this.intervalId = null;
}
}
currentIndex = 0;
addData(e) {
if (this.chart.data.labels) {
this.ecgData[this.currentIndex] = e.Value;
this.chart.data.labels[this.currentIndex] = this.currentIndex;
for (let i = this.currentIndex + 1; i < Math.min(this.currentIndex + 64, this.maxPoints); i++) {
this.ecgData[i] = null;
}
// Advance the index, and wrap around if it exceeds maxPoints
this.currentIndex = (this.currentIndex + 1) % this.maxPoints;
if (this.stage === 'sit') {
console.log('Current index:', this.currentIndex);
}
// Update the chart data
this.chart.data.datasets[0].data = this.ecgData;
this.chart.update();
}
}
initializeSse() {
const sseUrl = `https://ecgsse${this.stage ? `-${this.stage}` : ''}.dozee.cloud/sse/ecgstream?userId=${this.userId}&accessToken=${this.accessToken}&ngsw-bypass=true`;
this.ngZone.runOutsideAngular(() => {
this.eventSource = new EventSource(sseUrl);
this.eventSource.onmessage = (e) => {
const data = JSON.parse(e.data);
if (data.Key === 'SIGNAL' && this.isPageActive) {
this.ngZone.run(() => {
// Angular will detect this change and update bindings
let entry = [];
data.Values.forEach((s, i) => {
entry.push({
Timestamp: data.Timestamp + i * (1000 / this.frequency), // Adjust timestamp for frequency
Value: s,
});
if (entry.length === 4) {
this.buffer.push(entry);
if (this.stage === 'sit') {
console.log('Buffer length:', this.buffer.length);
}
entry = [];
}
});
});
}
};
this.eventSource.onerror = (error) => {
console.error('SSE error, will retry in 6s', error);
this.closeConnection();
// schedule a reconnect
setTimeout(() => {
this.initializeSse();
}, this.RETRY_DELAY);
};
});
}
ngOnDestroy() {
this.closeConnection();
}
closeConnection() {
if (this.eventSource) {
this.eventSource.close();
this.eventSource = null;
}
}
static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.3", ngImport: i0, type: DozeeEcgChartComponent, deps: [{ token: i0.Renderer2 }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Component });
static ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "18.2.3", type: DozeeEcgChartComponent, selector: "app-ecg-chart", inputs: { accessToken: "accessToken", userId: "userId", stage: "stage", strokeColor: "strokeColor", backgroundColor: "backgroundColor" }, ngImport: i0, template: "<div class=\"chart-container\">\n <canvas id=\"ecgChart\"></canvas>\n</div>\n", styles: [".chart-container{width:100%;height:100%;position:relative}canvas{width:100%!important;height:100%!important}\n"] });
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.3", ngImport: i0, type: DozeeEcgChartComponent, decorators: [{
type: Component,
args: [{ selector: 'app-ecg-chart', template: "<div class=\"chart-container\">\n <canvas id=\"ecgChart\"></canvas>\n</div>\n", styles: [".chart-container{width:100%;height:100%;position:relative}canvas{width:100%!important;height:100%!important}\n"] }]
}], ctorParameters: () => [{ type: i0.Renderer2 }, { type: i0.NgZone }], propDecorators: { accessToken: [{
type: Input
}], userId: [{
type: Input
}], stage: [{
type: Input
}], strokeColor: [{
type: Input
}], backgroundColor: [{
type: Input
}] } });
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{ Component, OnInit, Input, Renderer2, NgZone } from '@angular/core';\nimport {\n  Chart,\n  CategoryScale,\n  LinearScale,\n  LineController,\n  LineElement,\n  PointElement,\n  Title,\n  Tooltip,\n  Legend,\n} from 'chart.js';\n\ninterface EcgSignalData {\n  Key: string;\n  Timestamp: number;\n  Values: number[];\n}\n\ninterface Xy {\n  Timestamp: number;\n  Value: number;\n}\n\n@Component({\n  selector: 'app-ecg-chart',\n  templateUrl: './dozee-ecg-chart.component.html',\n  styleUrls: ['./dozee-ecg-chart.component.css'],\n})\nexport class DozeeEcgChartComponent implements OnInit {\n  @Input() accessToken!: string;\n  @Input() userId!: string;\n  @Input() stage!: string;\n  @Input() strokeColor: string = '#00ff00';\n  @Input() backgroundColor: string = '#000000';\n\n  private eventSource: EventSource | null = null;\n  private buffer: Xy[][] = [];\n  private chart!: Chart;\n  private frequency = 256; // Hz\n  private duration = 8; // seconds\n  private maxPoints = this.frequency * this.duration; // 2048 points\n  private ecgData = Array(this.maxPoints).fill(null);\n  private bufferLimit = 64 * 64;\n  private isPageActive = true;\n  private intervalId: any;\n  private inactivityTimeout: any; // Timer to track inactivity\n  private readonly INACTIVE_DELAY = 30000;\n  private readonly RETRY_DELAY = 6000;\n\n  constructor(private renderer: Renderer2, private ngZone: NgZone) {}\n\n  ngOnInit(): void {\n    // Register necessary chart components\n    Chart.register(\n      CategoryScale,\n      LinearScale,\n      LineController,\n      LineElement,\n      PointElement,\n      Title,\n      Tooltip,\n      Legend\n    );\n\n    const ctx = document.getElementById('ecgChart') as HTMLCanvasElement;\n    ctx.style.backgroundColor = this.backgroundColor;\n\n    this.chart = new Chart(ctx, {\n      type: 'line',\n      data: {\n        labels: Array(this.maxPoints).fill(0.0), // Empty labels as X axis is fixed\n        datasets: [\n          {\n            label: 'ECG Data',\n            data: this.ecgData,\n            borderColor: this.strokeColor,\n            borderWidth: 1,\n            fill: false,\n            pointRadius: 0, // Hide points for smooth line\n          },\n        ],\n      },\n      options: {\n        animation: false,\n        responsive: true,\n        maintainAspectRatio: false,\n        scales: {\n          x: {\n            type: 'linear',\n            min: 0,\n            max: this.maxPoints, // Set fixed X-axis range (8 seconds)\n            display: false, // Hide the x-axis\n            grid: { display: false },\n          },\n          y: {\n            max: 4000, // Adjust based on ECG value range\n            min: 0,\n            type: 'linear',\n            beginAtZero: true,\n            grid: { display: false },\n            display: false,\n          },\n        },\n        plugins: {\n          legend: {\n            display: false,\n          },\n        },\n        elements: {\n          line: {\n            tension: 0.4,\n          },\n        },\n      },\n    });\n\n    // Initialize SSE connection\n    this.initializeSse();\n\n    this.renderer.listen('document', 'visibilitychange', () => {\n      if (document.hidden) {\n        console.log('Page became inactive, starting 30s timeout...');\n        this.startInactivityTimer();\n      } else {\n        console.log('Page is active again, canceling inactivity timeout');\n        this.cancelInactivityTimer();\n        this.startInterval();\n      }\n    });\n\n    // Start interval initially\n    this.startInterval();\n  }\n\n  private startInterval() {\n    if (!this.intervalId) {\n      // Update chart data at regular intervals\n      this.intervalId = setInterval(() => {\n\n        if (this.buffer.length > this.bufferLimit && this.currentIndex === 0) {\n          if (this.stage === 'sit') {\n            console.warn(`Buffer overflow: Skipping ${this.buffer.length - 64} old entries`);\n          }\n          this.buffer.splice(0, this.buffer.length - 64);\n        }\n\n        if (this.buffer.length > 0) {\n          const entry = this.buffer.shift() as Xy[];\n          for (const e of entry) {\n            this.addData(e);\n          }\n        }\n      }, 16); // Update frequency (256 Hz)\n    }\n  }\n\n  private startInactivityTimer() {\n    this.inactivityTimeout = setTimeout(() => {\n      console.log('Page has been inactive for 30 seconds, stopping updates.');\n      this.isPageActive = false;\n      this.clearInterval();\n    }, this.INACTIVE_DELAY);\n  }\n\n  private cancelInactivityTimer() {\n    if (this.inactivityTimeout) {\n      clearTimeout(this.inactivityTimeout);\n      this.inactivityTimeout = null;\n    }\n    this.isPageActive = true;\n  }\n\n  private clearInterval() {\n    if (this.intervalId) {\n      clearInterval(this.intervalId);\n      this.intervalId = null;\n    }\n  }\n\n  private currentIndex = 0;\n  addData(e: Xy) {\n    if (this.chart.data.labels) {\n      this.ecgData[this.currentIndex] = e.Value;\n      this.chart.data.labels[this.currentIndex] = this.currentIndex;\n\n      for (\n        let i = this.currentIndex + 1;\n        i < Math.min(this.currentIndex + 64, this.maxPoints);\n        i++\n      ) {\n        this.ecgData[i] = null;\n      }\n\n      // Advance the index, and wrap around if it exceeds maxPoints\n      this.currentIndex = (this.currentIndex + 1) % this.maxPoints;\n      if (this.stage === 'sit') {\n      console.log('Current index:', this.currentIndex);\n      }\n\n      // Update the chart data\n      this.chart.data.datasets[0].data = this.ecgData;\n      this.chart.update();\n    }\n  }\n\n  initializeSse(): void {\n    const sseUrl = `https://ecgsse${this.stage ? `-${this.stage}`: ''}.dozee.cloud/sse/ecgstream?userId=${this.userId}&accessToken=${this.accessToken}&ngsw-bypass=true`;\n\n    this.ngZone.runOutsideAngular(() => {\n      this.eventSource = new EventSource(sseUrl);\n      this.eventSource.onmessage = (e: MessageEvent) => {\n        const data = JSON.parse(e.data) as EcgSignalData;\n        if (data.Key === 'SIGNAL' && this.isPageActive) {\n          this.ngZone.run(() => {\n            // Angular will detect this change and update bindings\n            let entry: Xy[] = [];\n            data.Values.forEach((s: number, i: number) => {\n              entry.push({\n                Timestamp: data.Timestamp + i * (1000 / this.frequency), // Adjust timestamp for frequency\n                Value: s,\n              });\n\n              if (entry.length === 4) {\n                this.buffer.push(entry);\n                if (this.stage === 'sit') {\n                  console.log('Buffer length:', this.buffer.length);\n                }\n                entry = [];\n              }\n            });\n          });\n        }\n      };\n\n      this.eventSource.onerror = (error) => {\n        console.error('SSE error, will retry in 6s', error);\n        this.closeConnection();\n\n        // schedule a reconnect\n        setTimeout(() => {\n          this.initializeSse();\n        }, this.RETRY_DELAY);\n      };\n    });\n  }\n\n  ngOnDestroy(): void {\n    this.closeConnection();\n  }\n\n  private closeConnection(): void {\n    if (this.eventSource) {\n      this.eventSource.close();\n      this.eventSource = null;\n    }\n  }\n}\n","<div class=\"chart-container\">\n  <canvas id=\"ecgChart\"></canvas>\n</div>\n"]}