Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 29x 29x 29x 2x 22x 22x 22x 22x 22x 53x 53x 53x 53x 53x 2x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 21x 22x 22x 21x 21x 21x 21x 21x 21x 21x 21x 9x 9x 9x 9x 9x 9x 9x 9x 21x 21x 21x 45x 45x 45x 45x 45x 42x 42x 45x 42x 42x 42x 42x 42x 45x 21x 21x 21x 21x 1x 1x 1x 1x 1x 21x 21x 21x 21x 1x 1x 1x 1x 21x 21x 21x 21x 21x 21x 1x 1x 1x 1x 1x 1x 1x 1x 21x 9x 9x 9x 9x 9x 18x 18x 18x 18x 18x 9x 9x 9x 18x 18x 18x 18x 18x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 9x 21x 21x 21x 2x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 3x 2x 13x 9x 9x 9x 13x 13x 2x 2x 2x 2x 2x 13x 13x 4x 4x 1x 1x 1x 1x 1x 1x 1x 1x 3x 13x 13x 2x 2x 2x 2x 2x 2x 1x 1x 2x 13x 13x 13x 1x 13x 13x 1x 1x 13x 13x 13x 13x 2x 2x 2x 2x 2x 2x 2x 2x 2x 13x 13x 13x 2x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 7x 7x 7x 4x 8x 8x 4x 5x 4x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 8x 4x 5x 5x 4x 4x 1x 1x 1x 1x 4x 1x 1x 1x 1x 1x 1x 1x 4x 4x 4x 4x 4x 4x 4x 2x 2x 2x 4x 4x 4x 2x 2x 2x 4x 1x 1x 1x 1x 4x 4x 4x 4x 4x 4x 4x 4x 1x 1x 1x 1x 1x 4x 4x 4x 4x 4x 1x 1x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 1x 1x 4x 3x 2x 2x 2x 3x 4x 4x 4x 4x 4x 4x 4x 4x | /**
* The dot plot as a view of its own (SPECS §28.2): its streaks drawn as the
* lines they are, at any zoom — the wheel zooms about the pointer, a drag or a
* sideways scroll moves it, a double click or `0` shows the whole — and the
* streak under the pointer lit and named on both axes, a press keeping it named.
*
* `drawDotplot` is the picture alone, from two axes, the lines and a window;
* the reference editor's corner plot (§27.3) draws the same picture through an
* edit. The arithmetic is `dotplot/view.ts`'s.
*/
import type { DotplotStreaks } from '../analysis/types'
import {
clampView,
fitView,
locusOf,
offsetsOf,
panView,
scaleOf,
streakAt,
streakEnds,
toBases,
toPixels,
zoomView,
type DotplotAxis,
type DotplotLines,
type DotplotView,
type PlotRect,
} from '../dotplot/view'
import { formatLocus, formatPosition } from '../genome/assembly'
import { fmt } from '../units'
import { MIN_FIGURE_WIDTH, plotTheme, watchTheme, type PlotFigure, type PlotTheme } from './analysisPlots'
import { figurePaper } from './canvasPalette'
import { el } from './dom'
import { subscribeTextScale } from './textScale'
/** The same way round, and the other: the two ends of the dot plot's own `RdBu_r`. */
export const SAME_WAY = '#b2182b'
export const OTHER_WAY = '#2166ac'
/** Pixels from a streak's line within which the pointer is on it. */
const REACH_PX = 6
/** The largest the plot asks to be, as the dot plot's picture always has (§28.3). */
const MOST_SIDE = 600
/** What a picture of the dot plot is drawn from. */
export interface DotplotPicture {
x: DotplotAxis & { label: string }
y: DotplotAxis & { label: string }
lines: DotplotLines
}
/**
* What a hover elsewhere lights in the plot — the reference editor's map
* naming a stretch of the edit (§27.3): its lines drawn over the others, which
* are dimmed, and its span along x marked, in the accent.
*/
export interface DotplotFocus {
lines: readonly number[]
span: readonly [number, number] | null
accent: string
}
/** How far the lines a focus leaves out are dimmed. */
const DIMMED = 0.2
/** Room around the plot for names and labels; a corner plot has none. */
function marginsOf(compact: boolean): { left: number; right: number; top: number; bottom: number } {
return compact ? { left: 4, right: 4, top: 4, bottom: 4 } : { left: 86, right: 12, top: 10, bottom: 46 }
}
/**
* The plot's rectangle in a box: square, since both axes are drawn at one
* scale and two assemblies of a genome are much of a size — as large as the
* box allows, and centred across it with its names.
*/
export function plotRectOf(box: { width: number; height: number }, compact = false): PlotRect {
const m = marginsOf(compact)
const across = Math.max(10, box.width - m.left - m.right)
const side = Math.max(10, Math.min(across, box.height - m.top - m.bottom))
return { x: m.left + (across - side) / 2, y: m.top, width: side, height: side }
}
/** A name cut to fit a room, with an ellipsis; empty where nothing fits. */
function fitted(ctx: CanvasRenderingContext2D, text: string, room: number): string {
if (ctx.measureText(text).width <= room) return text
let cut = text
while (cut.length > 1 && ctx.measureText(`${cut}…`).width > room) cut = cut.slice(0, -1)
return cut.length > 1 ? `${cut}…` : ''
}
/**
* The dot plot in a box: the plot's frame, a rule at every edge between two
* sequences — no two closer than three pixels — each sequence's name where it
* fits, the two axes' labels, and every streak in the window as a line, the
* same way round red and the other blue, the lit one drawn over a halo; and,
* given a focus, its span along x marked and its lines lit, the others dimmed.
*
* @returns The plot's rectangle and the window it drew, for a caller that maps
* pointers onto it.
*/
export function drawDotplot(
ctx: CanvasRenderingContext2D,
picture: DotplotPicture,
box: { width: number; height: number },
theme: PlotTheme,
view: DotplotView | null,
lit = -1,
compact = false,
focus: DotplotFocus | null = null,
): { rect: PlotRect; view: DotplotView } {
const rect = plotRectOf(box, compact)
const xOffsets = offsetsOf(picture.x)
const yOffsets = offsetsOf(picture.y)
const xTotal = xOffsets[xOffsets.length - 1]
const yTotal = yOffsets[yOffsets.length - 1]
const shown = clampView(view ?? fitView(xTotal, yTotal, rect), xTotal, yTotal, rect)
const at = (x: number, y: number): { px: number; py: number } => toPixels(shown, rect, x, y)
ctx.save()
ctx.fillStyle = theme.background
ctx.fillRect(0, 0, box.width, box.height)
// The data's own extent, a shade off the paper, so the edge of the sets reads.
const lo = at(0, 0)
const hi = at(xTotal, yTotal)
ctx.save()
ctx.beginPath()
ctx.rect(rect.x, rect.y, rect.width, rect.height)
ctx.clip()
ctx.strokeStyle = theme.grid
ctx.lineWidth = 1
ctx.strokeRect(Math.round(lo.px) + 0.5, Math.round(lo.py) + 0.5, Math.round(hi.px - lo.px), Math.round(hi.py - lo.py))
// The edges between sequences.
let last = Number.NEGATIVE_INFINITY
for (const offset of xOffsets.slice(1, -1)) {
const px = Math.round(at(offset, 0).px) + 0.5
if (px < rect.x || px > rect.x + rect.width || px - last < 3) continue
last = px
ctx.beginPath()
ctx.moveTo(px, Math.max(rect.y, lo.py))
ctx.lineTo(px, Math.min(rect.y + rect.height, hi.py))
ctx.stroke()
}
last = Number.NEGATIVE_INFINITY
for (const offset of yOffsets.slice(1, -1)) {
const py = Math.round(at(0, offset).py) + 0.5
if (py < rect.y || py > rect.y + rect.height || py - last < 3) continue
last = py
ctx.beginPath()
ctx.moveTo(Math.max(rect.x, lo.px), py)
ctx.lineTo(Math.min(rect.x + rect.width, hi.px), py)
ctx.stroke()
}
// The streaks: a line each, and a dot where the line is shorter than one.
const lines = picture.lines
const width = compact ? 1.2 : 1.6
const draw = (i: number, colour: string, lineWidth: number): void => {
const [ax, ay, bx, by] = streakEnds(lines, i)
const a = at(ax, ay)
const b = at(bx, by)
if (Math.max(a.px, b.px) < rect.x || Math.min(a.px, b.px) > rect.x + rect.width) return
if (Math.max(a.py, b.py) < rect.y || Math.min(a.py, b.py) > rect.y + rect.height) return
ctx.strokeStyle = colour
ctx.fillStyle = colour
if (Math.hypot(b.px - a.px, b.py - a.py) < lineWidth) {
ctx.fillRect((a.px + b.px) / 2 - lineWidth / 2, (a.py + b.py) / 2 - lineWidth / 2, lineWidth, lineWidth)
return
}
ctx.lineWidth = lineWidth
ctx.beginPath()
ctx.moveTo(a.px, a.py)
ctx.lineTo(b.px, b.py)
ctx.stroke()
}
ctx.lineCap = 'round'
// A focus's span, washed across the plot under the lines.
const span = focus?.span ?? null
const spanPx = span === null ? null : [Math.max(rect.x, at(span[0], 0).px), Math.min(rect.x + rect.width, at(span[1], 0).px)]
if (focus !== null && spanPx !== null && spanPx[1] > spanPx[0] - 1) {
ctx.fillStyle = focus.accent
ctx.globalAlpha = 0.12
ctx.fillRect(spanPx[0], rect.y, Math.max(1, spanPx[1] - spanPx[0]), rect.height)
ctx.globalAlpha = 1
}
ctx.globalAlpha = focus === null ? 1 : DIMMED
for (let i = 0; i < lines.x0.length; i++) draw(i, lines.strand[i] === -1 ? OTHER_WAY : SAME_WAY, width)
ctx.globalAlpha = 1
if (focus !== null) {
const shown = focus.lines.filter((i) => i !== lit && i >= 0 && i < lines.x0.length)
for (const i of shown) draw(i, theme.background, width + 3)
for (const i of shown) draw(i, lines.strand[i] === -1 ? OTHER_WAY : SAME_WAY, width + 0.8)
}
if (lit >= 0 && lit < lines.x0.length) {
draw(lit, theme.background, width + 5)
draw(lit, lines.strand[lit] === -1 ? OTHER_WAY : SAME_WAY, width + 2)
}
ctx.restore()
// The frame, in the ink, as every plot's is (§18.13).
ctx.strokeStyle = theme.ink
ctx.lineWidth = 1
ctx.strokeRect(rect.x + 0.5, rect.y + 0.5, rect.width - 1, rect.height - 1)
// A focus's span along x: a bar over the plot's top edge, as a pieces bar lights a stretch, and its two ends.
if (focus !== null && spanPx !== null && spanPx[1] > spanPx[0] - 1) {
const [a, b] = spanPx
ctx.fillStyle = focus.accent
ctx.fillRect(a, rect.y - 3, Math.max(2, b - a), 3)
ctx.globalAlpha = 0.7
ctx.fillRect(a, rect.y, 1, rect.height)
ctx.fillRect(Math.max(a, b - 1), rect.y, 1, rect.height)
ctx.globalAlpha = 1
}
if (!compact) {
// Each sequence's name where it fits: along x under the plot, along y to its left.
ctx.font = theme.font
ctx.fillStyle = theme.muted
ctx.textBaseline = 'top'
ctx.textAlign = 'center'
for (let i = 0; i < picture.x.names.length; i++) {
const a = Math.max(rect.x, at(xOffsets[i], 0).px)
const b = Math.min(rect.x + rect.width, at(xOffsets[i + 1], 0).px)
const name = b - a > 8 ? fitted(ctx, picture.x.names[i], b - a - 4) : ''
if (name !== '') ctx.fillText(name, (a + b) / 2, rect.y + rect.height + 4)
}
ctx.textAlign = 'right'
ctx.textBaseline = 'middle'
for (let i = 0; i < picture.y.names.length; i++) {
const a = Math.max(rect.y, at(0, yOffsets[i]).py)
const b = Math.min(rect.y + rect.height, at(0, yOffsets[i + 1]).py)
// Beside the plot, clear of the axis's own label at the box's edge.
const name = b - a >= 10 ? fitted(ctx, picture.y.names[i], rect.x - 30) : ''
if (name !== '') ctx.fillText(name, rect.x - 4, (a + b) / 2)
}
// The two sets' names.
ctx.fillStyle = theme.ink
ctx.textAlign = 'center'
ctx.textBaseline = 'bottom'
ctx.fillText(fitted(ctx, picture.x.label, rect.width), rect.x + rect.width / 2, box.height - 2)
ctx.save()
ctx.translate(12, rect.y + rect.height / 2)
ctx.rotate(-Math.PI / 2)
ctx.textBaseline = 'middle'
ctx.fillText(fitted(ctx, picture.y.label, rect.height), 0, 0)
ctx.restore()
}
ctx.restore()
return { rect, view: shown }
}
/** What the readout says of a place, or of a streak. */
export function describeStreak(picture: DotplotPicture, i: number, anchors?: ArrayLike<number>): string {
const lines = picture.lines
const xOffsets = offsetsOf(picture.x)
const yOffsets = offsetsOf(picture.y)
const x = locusOf(picture.x, xOffsets, lines.x0[i])
const y = locusOf(picture.y, yOffsets, lines.y0[i])
if (x === null || y === null) return ''
const xs = formatLocus({ contig: x.name, start: x.at, end: x.at + (lines.x1[i] - lines.x0[i]) })
const ys = formatLocus({ contig: y.name, start: y.at, end: y.at + (lines.y1[i] - lines.y0[i]) })
const way = lines.strand[i] === -1 ? 'the other way round' : 'the same way round'
const count = anchors === undefined ? '' : ` · ${Number(anchors[i]).toLocaleString('en-US')} anchors`
return `${xs} × ${ys} · ${way}${count}`
}
/** What a hand does over a dot plot's canvas, in the canvas's own CSS pixels. */
export interface DotplotHands {
/** Zoom by `factor` — above one, in — about `(x, y)`. */
zoom(factor: number, x: number, y: number): void
/** Move the picture by `(dx, dy)` pixels, following the hand. */
pan(dx: number, dy: number): void
/** Show both sets whole. */
whole(): void
/** The pointer over the plot, not dragging — and after a wheel, where it is. */
point(x: number, y: number): void
/** A press that did not travel. */
press(x: number, y: number): void
/** The pointer gone from the canvas, not dragging. */
leave(): void
}
/**
* The dot plot's gestures on a canvas (§28.2), for the view of its own and the
* reference editor's corner plot (§27.3) alike: the wheel zooms about the
* pointer, a drag or a sideways scroll moves the picture — as over a map
* (§7.2) — and a double click shows the whole.
*/
export function handDotplot(canvas: HTMLCanvasElement, hands: DotplotHands): void {
const local = (event: MouseEvent): { x: number; y: number } => {
const box = canvas.getBoundingClientRect()
return { x: event.clientX - box.left, y: event.clientY - box.top }
}
let press: { x: number; y: number; moved: boolean; pointer: number } | null = null
canvas.addEventListener('pointerdown', (event) => {
if (event.button !== 0) return
const { x, y } = local(event)
press = { x, y, moved: false, pointer: event.pointerId }
canvas.setPointerCapture?.(event.pointerId)
canvas.focus({ preventScroll: true })
})
canvas.addEventListener('pointermove', (event) => {
const { x, y } = local(event)
if (press !== null) {
if (!press.moved && Math.hypot(x - press.x, y - press.y) < 3) return
press.moved = true
canvas.classList.add('is-dragging')
hands.pan(x - press.x, y - press.y)
press.x = x
press.y = y
return
}
hands.point(x, y)
})
const release = (event: PointerEvent): void => {
if (press === null) return
const clicked = !press.moved
if (canvas.hasPointerCapture?.(press.pointer) === true) canvas.releasePointerCapture(press.pointer)
press = null
canvas.classList.remove('is-dragging')
if (!clicked) return
const { x, y } = local(event)
hands.press(x, y)
}
canvas.addEventListener('pointerup', release)
canvas.addEventListener('pointercancel', release)
canvas.addEventListener('pointerleave', () => {
if (press === null) hands.leave()
})
canvas.addEventListener('dblclick', (event) => {
event.preventDefault()
hands.whole()
})
canvas.addEventListener(
'wheel',
(event) => {
event.preventDefault()
const { x, y } = local(event)
// As over a map (§7.2): up and down zoom, sideways slides along the diagonal, ⌘ up and down slide.
if (Math.abs(event.deltaX) > Math.abs(event.deltaY)) {
hands.pan(-event.deltaX, -event.deltaX)
} else if (event.metaKey && !event.ctrlKey) {
hands.pan(0, -event.deltaY)
} else {
hands.zoom(Math.exp(-event.deltaY * (event.deltaMode === 1 ? 0.05 : 0.002)), x, y)
}
hands.point(x, y)
},
{ passive: false },
)
}
/** The dot plot's streaks as a view of their own: zoomed, moved, and read under the pointer. */
export function dotplotFigure(streaks: DotplotStreaks): PlotFigure {
const picture: DotplotPicture = { x: streaks.x, y: streaks.y, lines: streaks }
const canvas = el('canvas', {
class: 'analysis-figure-canvas dotplot-canvas',
style: { width: '100%' },
attrs: { tabindex: '0', 'aria-label': `Dot plot of ${streaks.x.label} against ${streaks.y.label}` },
})
const readout = el('div', { class: 'dotplot-readout', attrs: { 'aria-live': 'polite' } })
const whole = el('button', { class: 'btn btn-quiet dotplot-whole', text: 'the whole', attrs: { type: 'button' }, title: 'Show both sets whole (0, or a double click)' })
const host = el('div', { class: 'analysis-figure-canvas-host dotplot-host' }, canvas, whole, readout)
let width = 0
let fill = false
let view: DotplotView | null = null
let laid: { rect: PlotRect; view: DotplotView } | null = null
let lit = -1
let pinned = -1
let frame = 0
const xOffsets = offsetsOf(streaks.x)
const yOffsets = offsetsOf(streaks.y)
const xTotal = xOffsets[xOffsets.length - 1]
const yTotal = yOffsets[yOffsets.length - 1]
const heightFor = (w: number): number => {
const m = marginsOf(false)
return Math.min(MOST_SIDE, Math.max(MIN_FIGURE_WIDTH, w - m.left - m.right)) + m.top + m.bottom
}
const say = (text: string): void => {
readout.textContent = text
}
const idle = (): string =>
`${streaks.x0.length.toLocaleString('en-US')} streaks · scroll to zoom, drag to move, double-click for the whole · ${streaks.x.label} along x, ${streaks.y.label} along y`
const redraw = (): void => {
frame = 0
const cssWidth = Math.max(MIN_FIGURE_WIDTH, Math.round(width))
const cssHeight = fill ? Math.max(MIN_FIGURE_WIDTH, Math.round(host.clientHeight - readout.offsetHeight)) : heightFor(cssWidth)
const dpr = window.devicePixelRatio > 0 ? window.devicePixelRatio : 1
canvas.style.height = `${cssHeight}px`
const wantWidth = Math.max(1, Math.round(cssWidth * dpr))
const wantHeight = Math.max(1, Math.round(cssHeight * dpr))
if (canvas.width !== wantWidth) canvas.width = wantWidth
if (canvas.height !== wantHeight) canvas.height = wantHeight
const ctx = canvas.getContext('2d')
if (ctx === null) return
ctx.setTransform(dpr, 0, 0, dpr, 0, 0)
const shownLit = pinned >= 0 ? pinned : lit
laid = drawDotplot(ctx, picture, { width: cssWidth, height: cssHeight }, plotTheme(host), view, shownLit)
view = view === null ? null : laid.view
whole.classList.toggle('hidden', view === null)
// Where the lit streak is drawn, in the canvas's own pixels: what a gallery
// or a test aims at, as the stage's overlay says its view.
if (shownLit >= 0) {
const [ax, ay, bx, by] = streakEnds(streaks, shownLit)
const a = toPixels(laid.view, laid.rect, ax, ay)
const b = toPixels(laid.view, laid.rect, bx, by)
canvas.dataset.lit = [a.px, a.py, b.px, b.py].map((value) => value.toFixed(1)).join(' ')
} else {
delete canvas.dataset.lit
}
}
const schedule = (): void => {
if (frame === 0) frame = requestAnimationFrame(redraw)
}
const shownView = (): DotplotView | null => laid?.view ?? null
const reset = (): void => {
view = null
schedule()
say(idle())
}
const zoomBy = (factor: number, px?: number, py?: number): void => {
const current = shownView()
if (laid === null || current === null) return
const cx = px ?? laid.rect.x + laid.rect.width / 2
const cy = py ?? laid.rect.y + laid.rect.height / 2
view = clampView(zoomView(current, laid.rect, cx, cy, factor), xTotal, yTotal, laid.rect)
schedule()
}
const panBy = (dx: number, dy: number): void => {
const current = shownView()
if (laid === null || current === null) return
view = clampView(panView(current, laid.rect, dx, dy), xTotal, yTotal, laid.rect)
schedule()
}
/** What is under the pointer, said: the streak, or the place on both axes. */
const readAt = (x: number, y: number): void => {
const current = shownView()
if (laid === null || current === null) return
const inside = x >= laid.rect.x && x <= laid.rect.x + laid.rect.width && y >= laid.rect.y && y <= laid.rect.y + laid.rect.height
const next = inside ? streakAt(streaks, current, laid.rect, x, y, REACH_PX) : -1
if (next !== lit) {
lit = next
schedule()
}
canvas.classList.toggle('is-on-streak', next >= 0)
if (pinned >= 0) return
if (next >= 0) {
say(describeStreak(picture, next, streaks.anchors))
return
}
if (!inside) {
say(idle())
return
}
const bases = toBases(current, laid.rect, x, y)
const xs = locusOf(streaks.x, xOffsets, bases.x)
const ys = locusOf(streaks.y, yOffsets, bases.y)
const scale = scaleOf(current, laid.rect)
say(`${xs === null ? '—' : formatPosition(xs.name, xs.at)} × ${ys === null ? '—' : formatPosition(ys.name, ys.at)} · ${fmt.bp(scale)} a pixel`)
}
handDotplot(canvas, {
zoom: (factor, x, y) => zoomBy(factor, x, y),
pan: panBy,
whole: () => {
pinned = -1
reset()
},
point: readAt,
press: (x, y) => {
// A press on a streak keeps it named; anywhere else lets it go.
pinned = -1
readAt(x, y)
pinned = lit
schedule()
},
leave: () => {
lit = -1
canvas.classList.remove('is-on-streak')
if (pinned < 0) say(idle())
schedule()
},
})
canvas.addEventListener('keydown', (event) => {
const step = 40
const keys: Record<string, () => void> = {
'+': () => zoomBy(1.6),
'=': () => zoomBy(1.6),
'-': () => zoomBy(1 / 1.6),
_: () => zoomBy(1 / 1.6),
'0': reset,
ArrowLeft: () => panBy(step, 0),
ArrowRight: () => panBy(-step, 0),
ArrowUp: () => panBy(0, step),
ArrowDown: () => panBy(0, -step),
Escape: () => {
pinned = -1
say(idle())
schedule()
},
}
const run = keys[event.key]
if (run === undefined || event.metaKey || event.ctrlKey || event.altKey) return
event.preventDefault()
run()
})
whole.addEventListener('click', () => {
pinned = -1
reset()
})
const observer =
typeof ResizeObserver === 'undefined'
? null
: new ResizeObserver((entries) => {
const next = entries[0]?.contentRect.width ?? 0
if (Math.abs(next - width) < 0.5 && !fill) return
width = next
redraw()
})
observer?.observe(host)
if (observer === null) redraw()
say(idle())
const stopTheme = watchTheme(schedule)
const stopText = subscribeTextScale(schedule)
return {
el: host,
draw(ctx: CanvasRenderingContext2D, box: { width: number; height: number }): void {
// What an export draws is the window on screen, without the pointer's
// light, on paper whatever the theme where it is mounted (§7.2).
drawDotplot(ctx, picture, box, plotTheme(figurePaper()), view)
},
setFill(on: boolean): void {
if (fill === on) return
fill = on
host.classList.toggle('analysis-figure-fill', on)
redraw()
},
destroy(): void {
observer?.disconnect()
stopTheme()
stopText()
if (frame !== 0) cancelAnimationFrame(frame)
},
}
}
|