Live Line Chart

1"use client";
2 
3import { localPoint } from "@visx/event";
4import { ParentSize } from "@visx/responsive";
5import { scaleLinear, scaleTime } from "@visx/scale";
6import { bisector } from "d3-array";
7import {
8  Children,
9  isValidElement,
10  memo,
11  type ReactElement,
12  type ReactNode,
13  startTransition,
14  useCallback,
15  useEffect,
16  useMemo,
17  useRef,
18  useState,
19} from "react";
20import { cn } from "@/lib/utils";
21import {
22  isClipExcludedComponent,
23  isUnderlayComponent,
24} from "./chart-child-passthrough";
25import {
26  ChartProvider,
27  type LineConfig,
28  type Margin,
29  type TooltipData,
30} from "./chart-context";
31import { hmsTimeFmt } from "./chart-formatters";
32import { DEFAULT_CHART_LIFECYCLE } from "./chart-phase";
33import type { LiveLineProps } from "./live-line";
34import { extractReferenceAreaConfigs } from "./reference-area-config";
35import { wrapSingleYScale } from "./y-axis-scales";
36 
37// ---------------------------------------------------------------------------
38// Types
39// ---------------------------------------------------------------------------
40 
41export interface LiveLinePoint {
42  time: number;
43  value: number;
44}
45 
46export interface LiveLineChartProps {
47  /** Streaming data — array of { time: unixSeconds, value } */
48  data: LiveLinePoint[];
49  /** Latest value (smoothly interpolated to) */
50  value: number;
51  /** Key used for the value field in context data. Default: "value" */
52  dataKey?: string;
53  /** Visible time window in seconds. Default: 30 */
54  window?: number;
55  /** Number of X-axis ticks (used to compute leading offset). Default: 5 */
56  numXTicks?: number;
57  /** Leading offset in X-tick units (0 = now at right edge). Default: 0 */
58  nowOffsetUnits?: number;
59  /** Tight Y-axis. Default: false */
60  exaggerate?: boolean;
61  /** Interpolation speed (0–1). Default: 0.08 */
62  lerpSpeed?: number;
63  /** Chart margins */
64  margin?: Partial<Margin>;
65  /** Freeze chart scrolling. Default: false */
66  paused?: boolean;
67  /** Child components (LiveLine, Grid, ChartTooltip, LiveXAxis, LiveYAxis, etc.) */
68  children: ReactNode;
69  className?: string;
70  style?: React.CSSProperties;
71}
72 
73// ---------------------------------------------------------------------------
74// Helpers
75// ---------------------------------------------------------------------------
76 
77const LERP_SPEED = 0.08;
78const DEFAULT_MARGIN: Margin = { top: 24, right: 16, bottom: 32, left: 16 };
79/** React commit interval for the live animation loop (~30fps). */
80const LIVE_FRAME_COMMIT_MS = 32;
81 
82// … truncated