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16721x 1x 1x 16719x 384871x 16718x 16718x 384871x 1x 1x 1x 1x 16739x 16739x 16739x 16739x 16739x 16739x 1x 1x 1x 1x 1x 1x 16718x 16718x 16718x 16718x 16718x 16718x 16739x 129x 129x 16718x 16718x 16739x 16668x 16668x 16668x 16718x 16739x 16718x 16718x 1x 1x 4x 55x 55x 4x 4x 1x 1x 962x 962x 962x 1x 1x 12288x 12100x 12100x 12100x 12100x 12100x 12100x 12100x 12100x 12100x 12100x 12100x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12288x 12100x 12100x 12288x 12100x 12100x 12100x 12100x 12288x 12288x 12288x 12288x 12100x 12100x 12100x 12100x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 12100x 12100x 342634x 342634x 342634x 12100x 12100x 743x 743x 743x 12100x 3x 3x 3x 3x 3x 3x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 68x 68x 61x 61x 61x 61x 61x 61x 61x 61x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 9x 15x 15x 9x 1x 1x 1x 28x 28x 1x 1x 1x 721x 721x 1x 1x 1x 5x 5x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 3x 3x 3x 3x 1x 1x 1x 2x 2x 1x 1x 2x 2x 1x 1x 64x 3x 3x 64x 1x 1x 1x 1x 1x 64x 64x 64x 1x 1x 1x 1x 1x 1x 5667x 79987x 79987x 79987x 79987x 5667x 5667x 1x 1x 11x 11x 11x 235x 235x 235x 235x 11x 11x 1x 1x 4240x 4240x 4240x 4240x 4240x 4240x 4240x 4240x 4240x 4240x 4240x 120072x 120072x 120072x 57172x 120072x 59362x 59362x 3538x 4240x 4240x 4240x 4240x 4174x 4174x 1x 1x 12575x 4235x 4235x 4235x 4171x 4171x 4171x 1x 1x 1x 1x 1x 1x 1x 98x 98x 98x 98x 98x 98x 98x 4x 4x 4x 4x 4x 98x 94x 94x 94x 94x 98x 1x 1x 12575x 12511x 12511x 12511x 12511x 12511x 12511x 12575x 12575x 12575x 12575x 12511x 12575x 12575x 6710x 6710x 12575x 5785x 5627x 5785x 158x 158x 12575x 16x 16x 6x 16x 10x 10x 10x 10x 5643x 5643x 1x 1x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 123x 123x 123x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 6x 1x 1x | import {GeomElement} from "./elements/GeomElement";
import {PlaneElement} from "./elements/plane/PlaneElement";
import {FixedPoint} from "./elements/point/FixedPoint";
import {AllConstructions, Construction, SortedParams, constructions, getConstructionName} from "./elements/Constructions";
import {PointElement} from "./elements/point/PointElement";
import {Canvas} from "canvas";
import {LineElement} from "./elements/line/LineElement";
import {PolygonElement} from "./elements/polygon/PolygonElement";
import {CircleElement} from "./elements/circle/CircleElement";
import {ISlide, ISlideAnimation, IAnimationConfig} from "./index";
import {SlateAnimator} from "./SlateAnimator";
import {DiagnosticLog, IDiagnostic, IDiagnosticInput, DiagnosticSeverity,
diagnosticEventDetail} from "./Diagnostics";
export type SlateCanvas = HTMLCanvasElement | Canvas;
export type ResolveJustification = (ref: string) => string | null | undefined;
// #140 — an element that is highlighted or mid-animation is what the viewer
// is meant to be looking at, so it should not be painted over by whatever
// happens to be declared after it in the deck's `elements` array.
//
// `emphasized` is `_emphasisAmount > 0`, so this stays true through the
// post-animation fade taper — an element can't drop back down in z-order
// while it is still visibly gold. `drawProgress < 1` is the independent
// "currently being drawn in" flag: it defaults to 1 and every animation's
// finalise()/cancel resets it to 1, so it covers an animation that drives
// partial geometry without touching emphasis.
export function isPromoted(e: GeomElement): boolean {
return e.shouldHighlight || e.emphasized || e.drawProgress < 1;
}
/**
* Reorder one draw pass so promoted elements paint last (on top), while
* both groups keep their existing relative order.
*
* The promotion is deliberately *within a pass*, not to the top of the whole
* figure: `drawElements` runs face → edge → vertex → name, so a promoted
* face still stays under every edge. Highlighting a filled polygon therefore
* can't hide the lines drawn across it.
*
* When nothing is promoted this returns the input order, so the render is
* bit-for-bit unchanged for every static figure and every snapshot golden.
*/
export function promotedDrawOrder(elements: GeomElement[]): GeomElement[] {
let promoted: GeomElement[] | null = null;
for (let e of elements) {
if (isPromoted(e)) {
if (promoted == null) promoted = [];
promoted.push(e);
}
}
// Nothing highlighted or animating — the overwhelmingly common case.
// Hand back the original array untouched (no allocation, no reorder).
if (promoted == null) return elements;
const rest: GeomElement[] = [];
for (let e of elements) if (!isPromoted(e)) rest.push(e);
return rest.concat(promoted);
}
export class Slate {
protected _elements : GeomElement[];
// Name aliases — secondary names that resolve to existing elements
// without adding new ones to _elements. The original Geometry Applet
// and Euclid's *Elements* refer to the same circle by every
// permutation of its three named points (BCD ≡ CDB ≡ DBC ≡ …) and
// to lines by either endpoint order (AB ≡ BA). Authors register
// those equivalences here so the prose-side `{NAME}` shortcode can
// light up the canonical element without needing a parallel
// invisible duplicate per alias.
private _aliases : Map<string, string> = new Map();
// #140 — draw highlighted / mid-animation elements last within each
// pass so they aren't painted over by later-declared neighbours.
// On by default; set false to keep the strict declaration order.
private _highlightOnTop : boolean = true;
// Optional slideshow walk-through; populated from init().slides.
// Empty array means no presentation mode is available; SlateControls
// skips the "▶ Present" button.
private _slides : ISlide[] = [];
// Consumer-supplied callback resolving a justification ref label
// (e.g. "I.Post.3") to a URL. Returns null/undefined when the ref
// isn't recognised, in which case the Presentation overlay renders
// the ref as plain text. Undefined means no resolver was passed.
private _resolveJustification : ResolveJustification | null = null;
// Slide-transition animation config (rates, durations, modifiers).
// The slate ships a default; init() merges in whatever the
// consumer provides via IInitialization.animationConfig.
private _animationConfig : IAnimationConfig = {};
// The frame-driver. Lazy-created on first animateTo() so a
// headless test slate that never animates doesn't allocate a
// requestAnimationFrame loop.
private _animator : SlateAnimator | null = null;
// Ephemeral helper elements an animation can spawn for its
// lifetime (compass arms, guide circles, straightedge bars).
// Drawn on top of _elements in the same face → edge → vertex →
// name order; never appear in lookupElement; cleared on
// animator.cancel() as a safety net.
private _ephemerals : GeomElement[] = [];
// View transform: model (logical) coords → display px is
// F·model + T, where F = _viewScale (uniform) and T = (_viewOffsetX,
// _viewOffsetY). drawElements then scales by dpr to the bitmap; the
// pick path inverts it. T centres the figure when maximized (#99/#107);
// F shrinks the figure to fit a narrow display (#71). Defaults
// F=1, T=(0,0) are a no-op, so every existing render path — and the
// headless snapshot path — is bit-for-bit unchanged.
// #138 — the bounding box the maximized / presentation centring was
// computed from. Captured ONCE on entering the maximized view (#114
// centres once, not per slide) and cleared on leaving, so the centre
// can't drift as slides reveal and hide elements, and so cloneAside's
// centre phase (#99) eases to exactly the same target.
private _centringBounds : { minX: number, maxX: number, minY: number, maxY: number } | null = null;
// #164 — author-named element the maximized / presentation view centres
// on, instead of deriving the centre from the figure's bounds. Config,
// not measurement: clearCentringBounds() must NOT drop it.
private _centerOnName : string | null = null;
// #162 — an element wider or taller than this many canvases is treated
// as unbounded for centring purposes. Generous on purpose: real figures
// spill past their canvas by ~2x and must be unaffected.
private static readonly CENTRING_OUTLIER_FACTOR = 10;
private _centringOutliers : string[] = [];
private _viewOffsetX : number = 0;
private _viewOffsetY : number = 0;
private _viewScale : number = 1;
// The construction's authored coordinate extent (logical px). Element
// coords live here. Defaults to the canvas bitmap so the headless /
// snapshot path has logical == display == bitmap (fit-scale 1). init()
// overrides it with the authored size on a real DOM canvas (#71).
private _logicalWidth : number = 0;
private _logicalHeight : number = 0;
// Last-dispatched highlighted-name key, so the geomlib:highlight event
// (#108) fires only when the SET of highlighted elements changes — not
// on every redraw frame / emphasisAmount fade.
private _lastHighlightedKey : string = "\u0000";
// #154 — what this slate has complained about, so a badge can show it
// and a consumer can read it. Per-slate on purpose: the dedupe flags
// this replaced were module-global, so one figure's warning silenced
// every other figure on the page.
private _diagnostics : DiagnosticLog = new DiagnosticLog();
private _diagnosticListeners : Array<(s: Slate) => void> = [];
// #159 — names a macro animation will create partway through the walk
// (compassTransfer's keepCircles). They do not exist at build time, so
// both deck validators consult this before calling a name unresolvable.
private _deferredNames : Set<string> = new Set();
protected _screen : PlaneElement;
protected _pick : PointElement;
protected _canvas : SlateCanvas;
private _htmlCanvas : HTMLCanvasElement = null;
protected _bgcolor : string;
public inTest : boolean = false;
private static numSlate : number = 0;
private _itsNumSlate : number = -1;
constructor(canvas: SlateCanvas) {
Slate.numSlate += 1;
this._itsNumSlate = Slate.numSlate;
this._elements = [];
if(canvas == null) {
throw new TypeError("canvas cannot be null or undefined.");
}
this._canvas = canvas;
let screen_origin = new FixedPoint({x:0,y:0,z:0});
screen_origin.name = "screen_origin";
let screen_x = new FixedPoint({x:1,y:0,z:0});
screen_x.name = "screen_x";
let screen_y = new FixedPoint({x:0,y:1,z:0});
screen_y.name = "screen_y";
let screen = new PlaneElement({
A: screen_origin,
B: screen_x,
C: screen_y
});
screen.name = "screen";
screen.nameColor = null;
screen.isScreen = true;
this._screen = screen;
this._pick = null;
for(let e of [screen_origin, screen_x, screen_y, screen]) {
e.nameColor = null;
e.vertexColor = null;
e.vertexHighlightColor = null;
e.faceColor = null;
e.faceHighlightColor = null;
this._elements.push(e);
}
let slate = this;
let cnv : HTMLCanvasElement = this._canvas as HTMLCanvasElement;
this._htmlCanvas = cnv;
if(this._htmlCanvas.addEventListener == null) return;
// Pointer Events unify mouse / touch / stylus into one event model.
// Setting touch-action: none here (rather than relying on
// consumer-side CSS) tells the browser not to claim drag gestures
// for scroll/zoom; calling setPointerCapture on pointerdown ensures
// we keep getting move/up events even when the finger leaves the
// canvas bounds. See issue #55 for the design rationale.
this._htmlCanvas.style.touchAction = "none";
// Only the primary pointer drives the drag pipeline for now.
// Multi-touch (two-finger rotation etc.) is intentionally not yet
// wired — design questions tracked in issue #57.
let activePointerId: number | null = null;
this._htmlCanvas.addEventListener("pointerdown", (ev: PointerEvent) => {
if (activePointerId !== null) return; // already tracking a primary
activePointerId = ev.pointerId;
try { slate._htmlCanvas.setPointerCapture(ev.pointerId); } catch (_) { /* ignore */ }
let [x, y] = slate._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseDown(x, y);
});
this._htmlCanvas.addEventListener("pointermove", (ev: PointerEvent) => {
if (ev.pointerId !== activePointerId) return;
let [x, y] = slate._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseDrag(x, y);
});
let endPointer = (ev: PointerEvent) => {
if (ev.pointerId !== activePointerId) return;
let [x, y] = slate._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseUp(x, y);
try { slate._htmlCanvas.releasePointerCapture(ev.pointerId); } catch (_) { /* ignore */ }
activePointerId = null;
};
this._htmlCanvas.addEventListener("pointerup", endPointer);
this._htmlCanvas.addEventListener("pointercancel", endPointer);
this._htmlCanvas.addEventListener("lostpointercapture", (ev: PointerEvent) => {
if (ev.pointerId === activePointerId) {
// Browser revoked capture (e.g., system gesture); clear pick state.
if (slate._pick != null) {
slate._pick = null;
}
activePointerId = null;
}
});
}
_getCanvasPosition(x: number, y: number) : [number, number] {
let r = this._htmlCanvas.getBoundingClientRect();
// Map display px → model (logical) coords: invert the view
// transform F·model + T, so a click lands on the real element even
// while the figure is fit-scaled (#71) or slid to centre (#99/#107).
// getBoundingClientRect is display px; dpr never enters here.
// F = 1, T = 0 → today's plain rect subtraction.
const F = this._viewScale || 1;
return [(x - r.left - this._viewOffsetX) / F,
(y - r.top - this._viewOffsetY) / F];
}
_onMouseDown(x: number, y: number) {
this._pick = null;
this.movePick(x, y);
};
_onMouseUp(x: number, y: number) {
if (this._pick == null) return;
this.movePick(x, y);
this._pick = null;
};
_onMouseDrag(x: number, y: number) {
if (this._pick == null) return;
this.movePick(x, y);
};
get elements() : GeomElement[] {
return this._elements;
}
set highlightOnTop(value: boolean) {
this._highlightOnTop = value;
}
get highlightOnTop() : boolean {
return this._highlightOnTop;
}
set bgcolor(value: string ) {
this._bgcolor = value;
}
get bgcolor() : string {
return this._bgcolor;
}
// Public accessor for the underlying canvas. Consumer-side code on
// multi-canvas pages (e.g. the {NAME} shortcode on euclids-elements.org)
// needs to compare DOM positions of each slate's canvas against the
// prose-side <span> to pick the right slate. Was protected before
// 0.4.0; the few prior callers (s.canvas in elem-ref-highlight.js)
// were just reading undefined and falling through to a brute-force
// walk of geomlib.slates.
get canvas() : SlateCanvas {
return this._canvas;
}
lookupElement(name: string) : GeomElement {
for (let elem of this._elements) {
if (elem.name == name) {
return elem;
}
}
// Direct miss — follow the alias map and look up the canonical
// name. One hop only: we don't chase chains because aliases are
// expected to point at real element names, not at each other.
let canonical = this._aliases.get(name);
if (canonical != null) {
for (let elem of this._elements) {
if (elem.name == canonical) return elem;
}
}
return null;
}
// Register a single secondary name → canonical name mapping. Idempotent.
// Called by init() when the user passes an `aliases` field.
addAlias(from: string, to: string) : void {
this._aliases.set(from, to);
}
addAliases(aliases: {[from: string]: string}) : void {
for (let from in aliases) this._aliases.set(from, aliases[from]);
}
// Draggable elements named here are excluded from the slideshow's
// every-slide auto-union and follow slide visible sets like any
// other element — for proof-introduced draggables ("Take an
// arbitrary point F") that shouldn't show before their moment.
// They stay fully draggable whenever visible (#89). Populated by
// init() from the `deferDraggables` field.
private _deferredDraggables : Set<string> = new Set();
get deferredDraggables() : Set<string> {
return this._deferredDraggables;
}
deferDraggables(names: string[]) : void {
for (const n of names || []) this._deferredDraggables.add(n);
}
get slides() : ISlide[] {
return this._slides;
}
set slides(value: ISlide[]) {
this._slides = value || [];
}
get resolveJustification() : ResolveJustification | null {
return this._resolveJustification;
}
set resolveJustification(value: ResolveJustification | null) {
this._resolveJustification = value;
}
get animationConfig() : IAnimationConfig {
return this._animationConfig;
}
set animationConfig(value: IAnimationConfig) {
this._animationConfig = value || {};
}
get animator() : SlateAnimator | null {
return this._animator;
}
get ephemerals() : GeomElement[] {
return this._ephemerals;
}
addEphemeral(e: GeomElement) : void {
this._ephemerals.push(e);
}
// Register a pre-built element as a persistent (non-ephemeral) member of
// the figure — drawn in the normal pass, addressable by name, and governed
// by the slideshow visible-set. Used by macro animations (e.g.
// A.Circle.compassTransfer's keepCircles) to leave named scaffolding that a
// later slide can re-show, where addEphemeral's wipe-on-advance won't do.
addElement(e: GeomElement) : void {
if (this._elements.indexOf(e) === -1) this._elements.push(e);
}
removeEphemeral(e: GeomElement) : void {
const i = this._ephemerals.indexOf(e);
if (i >= 0) this._ephemerals.splice(i, 1);
}
clearEphemerals() : void {
this._ephemerals.length = 0;
}
get viewOffsetX() : number { return this._viewOffsetX; }
get viewOffsetY() : number { return this._viewOffsetY; }
get viewScale() : number { return this._viewScale; }
// Device pixel ratio (#71). The canvas BITMAP is sized to display px ×
// dpr so drawing lands on native device pixels (crisp on HiDPI/retina).
// Headless / no window → 1, so node-canvas rendering (and the snapshot
// goldens) is unchanged.
private _dpr() : number {
return (typeof window !== "undefined" && window.devicePixelRatio) || 1;
}
// The authored coordinate extent (logical px) — the space element
// coords live in. Falls back to the bitmap when unset (headless /
// snapshot path), so logical == bitmap there. (#71)
get logicalWidth() : number { return this._logicalWidth || this._canvas.width; }
get logicalHeight() : number { return this._logicalHeight || this._canvas.height; }
setLogicalSize(w: number, h: number) : void {
if (w > 0) this._logicalWidth = w;
if (h > 0) this._logicalHeight = h;
}
// The canvas DISPLAY size in CSS px (responsive; clientWidth on a real
// DOM canvas, the fixed bitmap headless). The figure is fit-scaled from
// logical → display. (#71)
get displayWidth() : number {
const c = this._canvas as any;
return (typeof c.clientWidth === "number" && c.clientWidth) || this._canvas.width;
}
get displayHeight() : number {
const c = this._canvas as any;
return (typeof c.clientHeight === "number" && c.clientHeight) || this._canvas.height;
}
// Recompute the fit-scale F = min(1, display / logical): shrink the
// figure to fit a narrow display, never grow it. Called on init/resize.
recomputeFitScale() : void {
const sx = this.displayWidth / this.logicalWidth;
const sy = this.displayHeight / this.logicalHeight;
this._viewScale = Math.min(1, sx, sy);
}
// Set the view transform's translate T (display px). drawElements
// applies F·model + T; the pick path inverts it. (#99/#107)
setViewOffset(x: number, y: number) : void {
this._viewOffsetX = x;
this._viewOffsetY = y;
}
clearViewOffset() : void {
this._viewOffsetX = 0;
this._viewOffsetY = 0;
}
// Axis-aligned bounding box (canvas px) of the visible figure —
// every named, visible, non-screen element. Returns null when the
// figure is empty. Used by cloneAside auto-place for the centre
// target and the fit check (#99). Points/lines/polygons/circles are
// measured exactly; sector markers sit inside their vertex (already
// counted) so they're not separately walked.
visibleBounds() : { minX: number, maxX: number, minY: number, maxY: number } | null {
return this._bounds(true);
}
// Like visibleBounds() but over EVERY named, non-screen element
// regardless of its `visible` flag — a stable bound that doesn't drift
// as a presentation reveals/hides elements slide-to-slide. Used to
// centre the figure in a maximized / presentation view (#107).
figureBounds() : { minX: number, maxX: number, minY: number, maxY: number } | null {
return this._bounds(false);
}
// #138 — does this element put any ink on the canvas?
//
// Deck figures carry construction helpers that exist only to define a
// direction or a slider's track — a "point at infinity" aim, the two
// anchors a lineSlider runs between — authored with zero colours so they
// draw nothing. They are still `visible`, so a visibility filter does NOT
// exclude them; only asking what actually paints does.
//
// The test is per type because a colour slot an element never uses tells
// us nothing: PointElement.drawEdge / drawFace are no-ops, so a point's
// edgeColor (which defaults to black when the author omits the field)
// must not count as ink — that default is exactly what made these helpers
// look paintable.
private _paintsInk(elem: GeomElement) : boolean {
if (!elem.visible) return false;
if (elem.nameColor != null) return true;
if (elem instanceof PointElement) return elem.vertexColor != null;
return elem.edgeColor != null || elem.faceColor != null;
}
// Bounding box to centre the figure on in the maximized / presentation
// view (#107). Measures only elements that actually paint, so an
// off-screen zero-colour helper can't inflate the box and translate the
// real geometry off-canvas — the #138 blank-slideshow bug, hit on I.35,
// I.42 and I.43.
//
// Captured once per maximized session rather than recomputed: the result
// must not move as slides change visibility, and cloneAside reads the
// same captured box so its centre phase lands where the base centring
// already is. Falls back to the all-elements bounds if nothing paints at
// all (a figure built entirely from helpers), so the caller always gets
// the same shape of answer as before.
captureCentringBounds() : { minX: number, maxX: number, minY: number, maxY: number } | null {
this._centringOutliers = [];
const inked = this._bounds(false, (e) => {
if (!this._paintsInk(e)) return false;
if (this._isCentringOutlier(e) || this._isOffCanvas(e)) {
if (e.name != null) this._centringOutliers.push(e.name);
return false;
}
return true;
});
// Everything was an outlier (or nothing paints) — better to centre on
// a runaway figure than to refuse to centre at all.
this._centringBounds = this._recentreOnTarget(inked != null
? inked
: (this._bounds(false, (e) => this._paintsInk(e)) || this._bounds(false)));
return this._centringBounds;
}
/**
* Name the element the maximized / presentation view centres on (#164).
*
* Bounds-derived centring stays the default and is right for nearly every
* figure. It cannot be right for some: the hyperbolic Desargues figure is
* built from geodesics, which ARE large circles, so no arrangement of its
* points makes its bounds match its canvas. #162 keeps such a figure from
* landing off-screen; this lets the author say where the centre actually
* is. Sits beside `pivot`, and often takes the same value.
*
* The name is resolved through the alias table and needs no label and no
* visibility — a zero-colour marker point is a perfectly good target, and
* is exactly what the Desargues page uses (`diskcenter`). An unresolvable
* name is reported (#154) and the figure falls back to bounds centring.
*/
setCenterOn(name: string | null) : void {
this._centerOnName =
(typeof name === "string" && name !== "") ? name : null;
if (this._centerOnName != null
&& this.lookupElement(this._centerOnName) == null) {
this.reportDiagnostic({
code: "unknown-center-on",
key: this._centerOnName,
message: "centerOn names '" + this._centerOnName +
"', but no element or alias resolves to it \u2014 the " +
"maximized view falls back to centring on the figure's " +
"bounds. Check for a typo, or for a target left behind " +
"by a figure change.",
detail: { centerOn: this._centerOnName },
});
}
}
/** The element name the view centres on, or null for bounds centring. */
get centerOn() : string | null {
return this._centerOnName;
}
/**
* Slide a measured box so its midpoint is the centerOn element's centre.
*
* Shifted rather than replaced: the box's EXTENT is still meaningful to
* other callers — cloneAside sizes its aside from it — so only the centre
* is overridden. For an element with extent, its own bounding-box centre
* is the natural reading of "centre on this".
*/
private _recentreOnTarget(
b: { minX: number, maxX: number, minY: number, maxY: number } | null
) : { minX: number, maxX: number, minY: number, maxY: number } | null {
if (this._centerOnName == null) return b;
const elem = this.lookupElement(this._centerOnName);
if (elem == null) return b; // reported in setCenterOn
const eb = this._elementBounds(elem);
if (eb == null) return b;
const cx = (eb.minX + eb.maxX) / 2, cy = (eb.minY + eb.maxY) / 2;
// Nothing painted at all — centre on the target with no extent.
if (b == null) return { minX: cx, maxX: cx, minY: cy, maxY: cy };
const dx = cx - (b.minX + b.maxX) / 2;
const dy = cy - (b.minY + b.maxY) / 2;
return { minX: b.minX + dx, maxX: b.maxX + dx,
minY: b.minY + dy, maxY: b.maxY + dy };
}
/**
* Should this element be left out of the centring box (#162)?
*
* #138 stopped an element that paints *nothing* from dragging the centre
* off-canvas. This is the other half: an element that legitimately paints
* but has runaway extent. A circumcircle through near-collinear points is
* unbounded, and on the hyperbolic Desargues figure one reached a radius
* of ~11,300 on a 500x320 canvas — bounds of roughly 22,600 x 23,100, so
* maximizing translated the whole figure into blank space.
*
* That is not an authoring mistake: Desargues' theorem is *about*
* collinearity, so constructions of that kind keep producing
* near-degenerate circles. Only the sliver crossing the canvas is ever
* seen, so such an element should not decide where the centre is.
*
* The threshold is deliberately generous — figures legitimately spill
* past their canvas (a Book I deck runs to ~2x) and must keep centring
* exactly as before. This only catches the pathological case.
*/
// #193 — an element lying ENTIRELY outside the logical canvas box is not
// part of the figure the reader sees at rest, so it must not define the
// centring frame. The converted applets park slider anchors at x = ±1000
// with a default vertex dot; they pass the paints test and, at under
// three canvases out, the factor-10 outlier test, and pulled every such
// figure's "centre" to x = 0 — off-centre by half a figure on a phone.
// An element that merely spills past the edge still intersects the box
// and is measured in full, as before.
private _isOffCanvas(elem: GeomElement) : boolean {
const w = this.logicalWidth, h = this.logicalHeight;
if (!(w > 0) || !(h > 0)) return false;
const b = this._elementBounds(elem);
if (b == null) return false;
return b.maxX < 0 || b.minX > w || b.maxY < 0 || b.minY > h;
}
private _isCentringOutlier(elem: GeomElement) : boolean {
// The GETTERS, not the private fields: _logicalWidth is 0 until
// init() sets it, and the getters fall back to the canvas bitmap.
// Reading the fields made this a silent no-op on any slate built
// without an explicit size — including the whole snapshot path.
const w = this.logicalWidth, h = this.logicalHeight;
if (!(w > 0) || !(h > 0)) return false; // no frame of reference
const b = this._elementBounds(elem);
if (b == null) return false;
return (b.maxX - b.minX) > w * Slate.CENTRING_OUTLIER_FACTOR
|| (b.maxY - b.minY) > h * Slate.CENTRING_OUTLIER_FACTOR;
}
/**
* Names of elements left out of the last centring measurement (#162).
*
* Exposed rather than reported: after this fix the figure centres
* correctly, so badging it would flag a page that now works. A deck
* checker can still surface these to point at a near-degenerate
* construction the author may want to know about.
*/
get centringOutliers() : string[] {
return this._centringOutliers.slice();
}
get centringBounds() : { minX: number, maxX: number, minY: number, maxY: number } | null {
return this._centringBounds;
}
clearCentringBounds() : void {
this._centringBounds = null;
}
// One element's axis-aligned extent, or null when it contributes none.
// Split out of _bounds (#162) so an element can be judged on its own
// size before it is allowed to influence the figure's centre.
private _elementBounds(elem: GeomElement) : { minX: number, maxX: number, minY: number, maxY: number } | null {
let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
const add = (x: number, y: number) => {
if (x < minX) minX = x; if (x > maxX) maxX = x;
if (y < minY) minY = y; if (y > maxY) maxY = y;
};
if (elem instanceof PolygonElement) {
for (let v of elem.V) add(v.x, v.y);
} else if (elem instanceof CircleElement) {
const r = elem.radius;
add(elem.Center.x - r, elem.Center.y - r);
add(elem.Center.x + r, elem.Center.y + r);
} else if (elem instanceof LineElement) {
add(elem.A.x, elem.A.y);
add(elem.B.x, elem.B.y);
} else if (elem instanceof PointElement) {
add(elem.x, elem.y);
}
if (minX === Infinity) return null;
return { minX, maxX, minY, maxY };
}
private _bounds(visibleOnly: boolean,
accept?: (e: GeomElement) => boolean) : { minX: number, maxX: number, minY: number, maxY: number } | null {
let minX = Infinity, maxX = -Infinity, minY = Infinity, maxY = -Infinity;
for (let elem of this._elements) {
if (elem.name == null || elem.name.startsWith("screen")) continue;
if (visibleOnly && !elem.visible) continue;
if (accept != null && !accept(elem)) continue;
const b = this._elementBounds(elem);
if (b == null) continue;
if (b.minX < minX) minX = b.minX;
if (b.maxX > maxX) maxX = b.maxX;
if (b.minY < minY) minY = b.minY;
if (b.maxY > maxY) maxY = b.maxY;
}
if (minX === Infinity) return null;
return { minX, maxX, minY, maxY };
}
// All names that resolve to the element named `canonical`: the
// element's own name plus every alias whose target is it. Used to tag
// the geomlib:highlight event so a consumer can match a prose ref by
// any spelling (BCD ≡ CDB ≡ DBC). (#108)
namesFor(canonical: string) : string[] {
const names = [canonical];
this._aliases.forEach((target, from) => {
if (target === canonical && from !== canonical) names.push(from);
});
return names;
}
// Lazy-create the animator on first use. Each slate owns at most
// one — cancel() preserves it for re-use across slide transitions.
private _ensureAnimator() : SlateAnimator {
if (this._animator == null) {
this._animator = new SlateAnimator(this);
}
return this._animator;
}
// Public entry point for slideshow controllers. Diff the current
// visibility / highlight state against the target, run any slide-
// listed animations against the elements becoming visible. Newly-
// visible elements without an explicit animation entry pop in
// instantly (4b parity). Returns a Promise that resolves when the
// animator completes the run or cancel() is called.
animateTo(
targetVisible: Set<string>,
targetHighlighted: Set<string>,
slideAnimations: ISlideAnimation[],
mode: "cascade" | "parallel",
) : Promise<void> {
return this._ensureAnimator().run(
targetVisible, targetHighlighted, slideAnimations, mode,
);
}
// Hide every named element whose name is not in the supplied set.
// Names not matching any element are silently ignored; elements
// without a name (intermediate construction outputs) are left alone.
// Screen-helper elements (screen / screen_origin / screen_x /
// screen_y) follow the same rule: their visible flag does flip, but
// since they're created with all-null colours they never draw
// visible pixels anyway. Called by the presentation overlay per
// slide; consumers can call directly too.
setVisibleNames(names: string[]) : void {
const visible = new Set(names);
for (let elem of this._elements) {
if (elem.name == null) continue;
elem.visible = visible.has(elem.name);
}
}
// Names of elements that start hidden (angle markers by default, or
// anything in init's `initiallyHidden`). clearVisibility restores to
// this baseline rather than blanket-true, so hidden elements stay
// hidden after a presentation walk. (#100)
private _initiallyHidden : Set<string> = new Set();
get initiallyHidden() : Set<string> {
return this._initiallyHidden;
}
// Mark a named element hidden in the initial figure: flips its
// visible flag off now and remembers it for clearVisibility.
setInitiallyHidden(name: string) : void {
if (name == null) return;
this._initiallyHidden.add(name);
const elem = this.lookupElement(name);
if (elem != null) elem.visible = false;
}
// Restore every element's visible flag to its initial baseline —
// true, except names registered as initially hidden. Counterpart to
// setVisibleNames; called on presentation exit so the canvas
// returns to its inline default.
clearVisibility() : void {
for (let elem of this._elements) {
elem.visible = !(elem.name != null && this._initiallyHidden.has(elem.name));
}
}
// Sort params into P[] (points), E[] (other elements), N[] (integers),
// matching Java's selectDataChoice (Slate.java lines 344-393).
// LineElements are expanded into their two endpoint PointElements, unless
// the target construction opts out (keepLineElements — e.g. curvedTriangle/
// curvedPolygon take a line intact as a straight-side carrier).
convertParams(params: any[], keepLineElements: boolean = false) : SortedParams {
let P: PointElement[] = [];
let E: GeomElement[] = [];
let N: number[] = [];
for(let param of params) {
switch(typeof(param)) {
case "string":
let g : GeomElement = this.lookupElement(param);
if ( g == null ) {
// #155 — a string that names nothing but reads as a
// number is an integer arg (parseParam leaves
// whitespace-padded numerics as strings; programmatic
// callers may pass "50"). Name lookup wins when both
// apply, so an element named "1 " is still reachable.
let n = Number(param);
if (param.trim() !== "" && !isNaN(n)) {
N.push(n);
break;
}
throw new TypeError(`Element with name ${param} not found.`);
}
if (g instanceof PointElement) {
P.push(g);
} else if (g instanceof LineElement && !keepLineElements) {
// LineElement expands to two PointElements (matching Java)
P.push(g.A);
P.push(g.B);
} else {
E.push(g);
}
break;
case "number":
N.push(param);
break;
default:
throw new TypeError("Expecting only named elements (strings) or numbers.");
}
}
return {P, E, N};
}
findConstruction(cm : AllConstructions, sp: SortedParams) : Construction {
for(let c of constructions) {
if(c.validateSignature(cm, sp)) {
return c;
}
}
return null;
}
createElement(cm : AllConstructions, params: any[], name?: string) : GeomElement {
// A construction for this method may want LineElement params kept
// intact (not expanded to endpoints) — see Construction.keepsLineElements.
let keepLines = constructions.some(c => c.constructionMethod === cm && c.keepsLineElements);
let sp : SortedParams = this.convertParams(params, keepLines);
let c : Construction = this.findConstruction(cm, sp);
if(c == null) {
let cName : String = getConstructionName(cm);
if (name == null) {
name = "";
}
throw new TypeError(`Construction not found for "${name}" ${cName} with params P=[${sp.P}] E=[${sp.E}] N=[${sp.N}]`);
}
let [gs, g] = c.construct(this._screen, sp.P, sp.E, sp.N);
// Mark as preexisting if this element was already in _elements
// before this construction (e.g., point;first returns an existing
// PointElement). Preexisting elements are skipped during
// rotate/translate to avoid double-movement.
// (Java: Slate.java preexists[] array)
if (this._elements.indexOf(g) !== -1) {
g.preexists = true;
}
if(name != null)
g.name = name;
for (let elem of gs) {
if (this._elements.indexOf(elem) == -1)
this._elements.push(elem);
}
if(this._elements.indexOf(g) == -1)
this._elements.push(g);
return g;
}
reset() : void {
for (let element of this._elements) {
element.reset();
}
this.update();
}
update() : void {
for(let element of this._elements) element.update();
this.drawElements();
}
drawElements(): void {
if(this.inTest) return;
let ctx : CanvasRenderingContext2D = this._canvas.getContext("2d") as CanvasRenderingContext2D;
// View transform (#71/#99/#107): model (logical) coords map to
// device px as dpr·(F·model + T), where F = _viewScale (fit) and
// T = view offset (centre). Clear + background fill cover the whole
// bitmap under identity; the figure + ephemerals then draw under the
// model→device transform. Headless dpr=1, F=1, T=0 → identity, so
// node-canvas rendering (and every snapshot golden) is unchanged.
const dpr = this._dpr(), F = this._viewScale;
const tx = this._viewOffsetX, ty = this._viewOffsetY;
// Keep decorations (labels, dots, line widths) a constant on-screen
// size while the geometry is fit-scaled by F (#71). 1/F ≥ 1; F=1 → 1.
GeomElement.styleScale = F > 0 ? 1 / F : 1;
ctx.setTransform(1, 0, 0, 1, 0, 0);
ctx.clearRect(0, 0, this._canvas.width, this._canvas.height);
ctx.fillStyle = this._bgcolor;
ctx.fillRect(0, 0, this._canvas.width, this._canvas.height);
ctx.setTransform(dpr * F, 0, 0, dpr * F, dpr * tx, dpr * ty);
// #140 — highlighted / mid-animation elements paint last within each
// pass, so a later-declared neighbour can't chop the gold stroke
// where it crosses. Identity when nothing is promoted.
const order = this._highlightOnTop
? promotedDrawOrder(this._elements) : this._elements;
for(let element of order) element.drawFace(this._canvas);
for(let element of order) element.drawEdge(this._canvas);
for(let element of order) element.drawVertex(this._canvas);
// and then draw their names.
for(let element of order)
element.drawName(this._canvas);
// Ephemeral animation helpers render on top of the permanent
// figure (compass arms, guide circles, straightedge bars).
// Same face → edge → vertex → name pass order so a guide arc
// overlays correctly without re-clearing the canvas.
for(let e of this._ephemerals) e.drawFace(this._canvas);
for(let e of this._ephemerals) e.drawEdge(this._canvas);
for(let e of this._ephemerals) e.drawVertex(this._canvas);
for(let e of this._ephemerals) e.drawName(this._canvas);
ctx.setTransform(1, 0, 0, 1, 0, 0); // reset so nothing leaks
GeomElement.styleScale = 1;
this._dispatchHighlightChange();
}
// #108 — bidirectional highlight binding. After each real draw, if the
// SET of highlighted elements (shouldHighlight || emphasized — the
// boolean intent, ignoring the fading emphasisAmount) has changed,
// emit a `geomlib:highlight` CustomEvent on the canvas so a consuming
// page can light up every textual reference to those elements. The
// event carries each element's canonical name + all its aliases. Fires
// on any highlight source (prose-ref hover, slide `highlighted`) since
// it lives in the shared redraw path; idempotent (no re-emit on an
// unchanged set → no feedback loop). No-op when the canvas can't
// dispatch DOM events (node-canvas in tests).
private _dispatchHighlightChange() : void {
const names: string[] = [];
for (let elem of this._elements) {
if (elem.name == null || elem.name.startsWith("screen")) continue;
if (elem.shouldHighlight || elem.emphasized) names.push(elem.name);
}
const key = names.sort().join("|");
if (key === this._lastHighlightedKey) return;
this._lastHighlightedKey = key;
const canvas: any = this._canvas;
if (!canvas || typeof canvas.dispatchEvent !== "function"
|| typeof CustomEvent !== "function") return;
const highlighted = names.map(n => ({ name: n, aliases: this.namesFor(n) }));
canvas.dispatchEvent(new CustomEvent("geomlib:highlight", {
bubbles: true,
detail: { highlighted },
}));
}
// ---- Diagnostics (#154) ------------------------------------------
//
// geomlib skips what it cannot resolve and keeps rendering, which is
// the right behaviour — a deck with one bad name should still draw.
// The cost is that the only evidence was a console line nobody has
// open. Reporting through here records it too, so SlateControls can
// badge the canvas and a consumer can read the list.
/**
* Record a diagnostic and mirror it to the console.
*
* Deduped per key, per slate: repeat reports bump a counter without
* a second console line. That replaces two module-global dedupe
* flags which silenced a warning for every OTHER figure on the page
* once any one figure tripped them.
*/
reportDiagnostic(input: IDiagnosticInput) : void {
const rec = this._diagnostics.report(input, Date.now());
if (rec == null) return; // already reported on this slate
if (typeof console !== "undefined") {
const fn = rec.severity === "error" ? console.error : console.warn;
if (fn) fn("[geomlib] " + rec.message);
}
this._dispatchDiagnostic(rec);
this._notifyDiagnosticListeners();
}
/**
* Register names that an animation will create later in the walk (#159).
*
* Deck validation runs when the figure is built, so a name a macro has
* yet to register would otherwise look like a typo. This does NOT create
* the elements — lookupElement still returns null until the animation
* runs; it only tells the validators that the name is accounted for.
*/
declareDeferredNames(names: string[]) : void {
for (const n of names || []) {
if (typeof n === "string" && n !== "") this._deferredNames.add(n);
}
}
/** True when some animation on this slate has claimed the name (#159). */
isDeferredName(name: string) : boolean {
return this._deferredNames.has(name);
}
/** Everything this slate has reported, oldest first. */
get diagnostics() : IDiagnostic[] {
return this._diagnostics.entries;
}
/** Worst severity reported, or null when the slate is clean. */
get diagnosticSeverity() : DiagnosticSeverity | null {
return this._diagnostics.severity;
}
/**
* Forget everything reported so far.
*
* NOT called from reset(): minimize() and presentation-exit both run
* reset() internally, and construction-time diagnostics never fire
* again, so clearing there would silently discard exactly the
* warnings worth keeping. SlateControls calls this from the explicit
* reset control / `r` key instead — a deliberate viewer gesture.
*/
clearDiagnostics() : void {
this._diagnostics.clear();
this._dispatchDiagnostic(null);
this._notifyDiagnosticListeners();
}
/** Subscribe to diagnostic changes. Returns an unsubscribe fn. */
onDiagnosticsChanged(listener: (s: Slate) => void) : () => void {
this._diagnosticListeners.push(listener);
return () => {
const i = this._diagnosticListeners.indexOf(listener);
if (i >= 0) this._diagnosticListeners.splice(i, 1);
};
}
private _notifyDiagnosticListeners() : void {
for (const l of this._diagnosticListeners.slice()) {
try { l(this); } catch (_) { /* a listener must not break reporting */ }
}
}
// Same capability guard as the geomlib:highlight dispatch above — a
// node-canvas Canvas has no dispatchEvent, so the headless path
// short-circuits here exactly as it does for highlights.
private _dispatchDiagnostic(d: IDiagnostic | null) : void {
const canvas: any = this._canvas;
if (!canvas || typeof canvas.dispatchEvent !== "function"
|| typeof CustomEvent !== "function") return;
canvas.dispatchEvent(new CustomEvent("geomlib:diagnostic", {
bubbles: true,
detail: diagnosticEventDetail(this._diagnostics, d),
}));
}
// Update coordinates starting with element[i+1], matching Java's
// Slate.java updateCoordinates (lines 808-814). Only elements AFTER
// the picked element are recomputed — elements before it are left
// untouched to avoid reprojection artifacts after rotation.
updateCoordinates(i : number) {
for(++i; i < this._elements.length; i++) {
if(!this._elements[i].defined())
this._elements[i].reset();
this._elements[i].update();
}
this.drawElements();
}
translateCoordinates(dx : number, dy: number) {
// translate all non-preexisting elements
// (Java: Slate.java line 819 — if (!preexists[i]) element[i].translate(...))
for(let i = 0; i < this._elements.length; i++) {
let elem = this._elements[i];
if (!elem.preexists)
elem.translate(dx, dy);
}
this.update();
}
closestVisiblePoint(elements : GeomElement[], p : PointElement, tolerance : number = 30) : PointElement {
// Use 2D screen distance (x,y only, ignoring z) for picking,
// matching the Java applet's movePick() at Slate.java:887-889.
// The canvas is a 2D projection; a 3D point at (x,y,z) renders
// at screen position (x,y) regardless of z.
let screenDist2 = (a: PointElement, b: PointElement) =>
(a.x - b.x) * (a.x - b.x) + (a.y - b.y) * (a.y - b.y);
let sortedDistanceElements = elements
.filter(e => e instanceof PointElement)
.map(e => e as PointElement)
.filter(e => e.vertexColor != null)
.sort((a,b) => {
let adcp = screenDist2(a, p);
let bdcp = screenDist2(b, p);
if(adcp < bdcp) {
return -1;
} else if (bdcp < adcp) {
return 1;
}
return 0;
});
if (sortedDistanceElements.length == 0) return null;
let bestDistPoint = sortedDistanceElements[0];
if(Math.sqrt(screenDist2(bestDistPoint, p)) > tolerance) return null;
return bestDistPoint;
}
private _getPick(c: number, d: number) : PointElement {
if (this._pick != null) return this._pick;
let currentPoint = new PointElement({x:c,y:d});
let closestVisiblePoint = this.closestVisiblePoint(this._elements, currentPoint);
if(closestVisiblePoint == null) return;
this._pick = closestVisiblePoint;
return this._pick;
}
// Set the pivot point for scene rotation.
// Format: "pointName" or "pointName,planeName"
// Without a plane, the pivot is set on the screen plane.
// With a plane, the pivot is set on that plane (for 3D rotation).
// (Java: Slate.java setPivot, lines 787-801)
setPivot(param : string) : void {
let parts = param.split(",");
let pointName = parts[0].trim();
let e : GeomElement = this.lookupElement(pointName);
if (e == null || !(e instanceof PointElement)) return;
let piv : PointElement = e as PointElement;
if (parts.length > 1) {
// "A,xyplane" — set pivot on a specific plane
let planeName = parts[1].trim();
let p : GeomElement = this.lookupElement(planeName);
if (p == null || !(p instanceof PlaneElement)) return;
(p as PlaneElement).pivot = piv;
} else {
// "A" — set pivot on screen plane
piv._AP = this._screen;
this._screen.pivot = piv;
}
}
movePick(c: number, d: number) : void {
if(this._getPick(c, d) == null) return;
let picki = this._elements.indexOf(this._pick);
// Clamp the drag to the on-screen region in MODEL coords. Under the
// view transform F·model + T, the display spans model
// [−T/F, (display − T)/F] — so the fit-scale (#71) and centre offset
// (#99/#107) both shift/scale the bounds. F=1, T=0 → [0, display].
const F = this._viewScale || 1;
let ox = this._viewOffsetX, oy = this._viewOffsetY;
let loX = -ox / F, hiX = (this.displayWidth - ox) / F;
if (c < loX) c = loX; else if (c > hiX) c = hiX;
let loY = -oy / F, hiY = (this.displayHeight - oy) / F;
if (d < loY) d = loY; else if (d > hiY) d = hiY;
if (Math.abs(c - this._pick.x) + Math.abs(d - this._pick.y) < 1.0) {
return; // no motion
}
if ( this._pick.draggable ) {
if(this._pick.drag(c,d)) {
this.updateCoordinates(picki);
} else {
return;
}
} else if (this._pick.AP != null
&& this._pick.AP.pivot != null
&& this._pick.AP.pivot != this._pick) { // rotate around the pivot
this.rotateCoordinates(c,d);
} else {
let dx = c - this._pick.x;
let dy = d - this._pick.y;
this.translateCoordinates(dx,dy);
}
this.drawElements();
}
rotateCoordinates(c : number, d : number) : void {
// rotate space according to how pick goes around pivot in the plane
let pick : PointElement = this._pick;
let piv : PointElement = pick.AP.pivot;
// compute old and new pick's 3D coordinates relative to the pivot
let oldP : PointElement = PointElement.difference(pick,piv);
let newx : number = c-piv.x;
let newy : number = d-piv.y; //(newz is irrelevant)
// find their 2D coordinates on the plane
let S : PointElement = pick.AP.S;
let T : PointElement = pick.AP.T;
let olds : number = PointElement.dot(oldP,S);
let oldt : number = PointElement.dot(oldP,T);
let den : number = S.x * T.y - S.y * T.x;
let news : number = (newx*T.y - newy*T.x)/den;
let newt : number = (newy*S.x - newx*S.y)/den;
// compute the scale&rotation factors
den = olds*olds + oldt*oldt;
let ac : number = (news*olds + newt*oldt)/den;
let as : number = (newt*olds - news*oldt)/den;
// Rotate all non-preexisting elements directly.
// (Java: Slate.java line 843-845)
for (let elem of this._elements) {
if (!elem.preexists)
elem.rotate(piv, ac, as);
}
// After direct rotation, recompute derived elements from their (now
// rotated) parents. Java doesn't need this because element[] carries
// duplicate entries for shared objects — a Layoff created by
// line;extend and re-referenced by point;last appears at two indices,
// one with preexists=false that gets rotated directly. TS dedupes
// _elements, so a shared object marked preexists=true is skipped,
// which means Layoff-style points backed by bare LineElement wrappers
// would never get moved directly (bare LineElement.rotate is a no-op).
// Running update() rebuilds them from their (rotated) parents, which
// produces the same result because rotation is a linear operation
// and Layoff.update() derives its position from parent coords.
this.update();
}
}
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