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| Title: GeomElement.ts |
| A port of the software Geometry Applet by |
| Author: David E. Joyce |
| Department of Mathematics and Computer Science |
| Clark University |
| Worcester, MA 01610-1477 |
| U.S.A. |
| |
| http://aleph0.clarku.edu/~djoyce/home.html |
| djoyce@clarku.edu |
| |
| Date: February, 1996. Version 2.0.0 May, 1997. |
| TypeScript Port: 2019, Nelson Brown, brownnrl@gmail.com |
| https://www.nelsonbrown.net/ |
+----------------------------------------------------------------------*/
import {PointElement} from "./point/PointElement"
import {SlateCanvas} from "../Slate";
export enum Align {
CENTRAL,
LEFT,
RIGHT,
ABOVE,
BELOW
}
export abstract class GeomElement {
constructor() {
}
protected _name: string;
// True for elements that are references to existing elements (e.g.,
// point;first returns P[0], point;vertex returns polygon.V[n-1]).
// Preexisting elements are skipped during rotate/translate to avoid
// double-movement. Matches Java's preexists[] array in Slate.java.
public preexists: boolean = false;
// All colors default to null (transparent) — matching Java's Element.java.
// Named elements get their colors assigned by init() in index.ts, which
// computes type-appropriate defaults. Internal/intermediate elements
// created inside constructions stay null (invisible) unless explicitly set.
private _nameColor: string = null;
protected _vertexColor : string = null;
private _edgeColor : string = null;
private _faceColor : string = null;
// #182 — true when this element's face is the dim-2 default
// (lighten(bgcolor), opaque) rather than a face the author asked for.
// Harmless at rest; #140 promotes a highlighted or animated element to
// draw last within its pass, at which point an opaque near-white face
// paints over whatever is beneath it. Recorded at construction because
// the default is a computed colour string, so comparing colours later
// could not tell "author asked for this" from "we filled it in".
public faceIsDefault : boolean = false;
// Highlight defaults pick high-contrast values that read on the typical
// cream / white backgrounds the library is used against. The previous
// edge/vertex default of white was invisible on the Elements site's
// theorem-box background (HSB 35,19,100 ≈ #FFE9CD). Web "gold"
// (#FFD700) is brighter / more saturated than Material amber and
// still reads against both cream and white.
private _nameHighlightColor : string = '#FFD700';
private _vertexHighlightColor : string = '#FFD700';
private _edgeHighlightColor : string = '#FFD700';
private _faceHighlightColor : string = '#FFD700';
// Default matches Java: Font("TimesRoman", Font.ITALIC, 18)
protected static _fontSize : number = 18;
protected static _fontName : string = "Times New Roman";
// Style scale (#71): when the figure is fit-scaled down to a narrow
// display (view scale F < 1), decorations — label font, vertex dots,
// line widths — are multiplied by 1/F so they keep a constant on-screen
// size and stay readable while the geometry shrinks. Slate.drawElements
// sets it from the view scale before each frame; 1 (the default, and
// F=1 desktop/headless) leaves rendering bit-for-bit unchanged.
static styleScale : number = 1;
static setFont(fontName: string, fontSize: number): void {
GeomElement._fontName = fontName;
GeomElement._fontSize = fontSize;
}
// The label font, scaled by the current styleScale.
static fontString(): string {
return `italic ${GeomElement._fontSize * GeomElement.styleScale}px ${GeomElement._fontName}`;
}
private _draggable : boolean;
private _dimension : number;
private _align : Align;
private _shouldHighlight : boolean = false;
// Per-element visibility flag honoured by every draw method. Default
// true preserves existing consumer behaviour; flipping false makes
// drawFace / drawEdge / drawVertex / drawName early-return so the
// element disappears without being removed from _elements (so
// dependents that read its coordinates still work). Used by
// Slate.setVisibleNames + the slideshow Presentation overlay.
private _visible : boolean = true;
// One step above shouldHighlight: when the slideshow caption's
// {NAME} ref is hovered or clicked, the matching element flips to
// emphasized. drawEdge / drawVertex paint with the highlight colour
// at an even thicker stroke / larger dot so the element pops out
// from any other already-highlighted ones on the slide. Released on
// mouseleave (or click-to-toggle for sticky).
// Emphasis amount in [0, 1]. Boolean emphasized is a thin shim
// that toggles between 0 and 1; the SlateAnimator fades the
// amount smoothly from 1 → 0 after an animation finishes so the
// visible "shrink back to highlight thickness" feels less jarring
// when the underlying element is also slide-highlighted (e.g.
// ABC polygon edges over the highlighted AB / AC / BC).
private _emphasisAmount : number = 0;
// Animation progress for the next slide-transition render. 1 means
// "fully drawn" (the default and the existing behaviour). Values in
// [0, 1) tell per-type draw methods to render a partial geometry —
// a half-traced line, a 30° sweep of an arc, the first edge of a
// polygon plus a fraction of the next. Driven by Animation
// subclasses through SlateAnimator during slide transitions; flips
// back to 1 on each animation's finalise() so the canvas returns
// to the fully-rendered state when the transition completes or is
// cancelled.
private _drawProgress : number = 1;
protected _pixelTolerance : number = 50;
protected _getTextMetrics(ctx: CanvasRenderingContext2D, txt: string) : [number, number] {
let textMetrics = ctx.measureText(txt);
let w = textMetrics.width;
// Use actual font metrics for height; fall back to ascent-based estimate
let h = (textMetrics.actualBoundingBoxAscent != null)
? textMetrics.actualBoundingBoxAscent + textMetrics.actualBoundingBoxDescent
: 16;
return [w, h];
}
drawString(ix : number, iy : number, c: SlateCanvas, overrideAlign? : Align) {
let ctx = c.getContext("2d") as CanvasRenderingContext2D;
if(this._nameColor == null) return;
ctx.font = GeomElement.fontString();
ctx.fillStyle = this._nameColor;
let [w, h] = this._getTextMetrics(ctx, this._name);
switch (overrideAlign || this._align) {
case Align.LEFT:
ix = ix - w - 6;
iy = iy + h/2 - 4;
ctx.fillText(this._name, ix, iy);
return;
case Align.RIGHT:
ix += 2;
iy += h/2 - 4;
ctx.fillText(this._name, ix, iy);
return;
case Align.ABOVE:
ix -= w/2;
iy += -h/2 + 4;
ctx.fillText(this._name, ix, iy);
return;
case Align.BELOW:
ix -= w/2;
iy += h/2 + 6;
ctx.fillText(this._name, ix, iy);
return;
}
// compute (dx,dy) coordinates relative to center of canvas
// and normalized
let cw = c.width;
let ch = c.height;
let dx = (ix - cw/2) * ch;
let dy = (iy - ch/2) * cw;
if (dy > dx) {
if (dy >= -dx) // put name below
{
ix -= w/2;
iy += h/2 + 6;
ctx.fillText(this._name, ix, iy);
}
else // put name left
{
ix = ix - w - 6;
iy += h/2 - 4;
ctx.fillText(this._name, ix, iy);
}
}
else {
if (dy >= -dx) { // put name right
ix += 2;
iy += h/2 - 4;
ctx.fillText(this._name, ix, iy);
} else { // put name above
ix -= w/2;
iy += -h/2 + 4;
ctx.fillText(this._name, ix, iy);
}
}
}
public get name() {
return this._name;
}
public set name(n : string) {
this._name = n;
}
public abstract update() : void;
public reset() { this.update(); }
public defined() : boolean { return false; }
public drag(tox: number, toy: number) : boolean { return false; }
// drag returns true when the element is actually dragged
public abstract translate(dx: number, dy: number) : void;
public abstract rotate(pivot : PointElement, ac : number, as: number) : void;
public abstract drawName(c: SlateCanvas) : void;
public abstract drawFace(c: SlateCanvas) : void;
public abstract drawEdge(c: SlateCanvas) : void;
public abstract drawVertex(c: SlateCanvas) : void;
set nameColor(value: string) {
this._nameColor = value;
}
set edgeColor(value: string) {
this._edgeColor = value;
}
set faceColor(value: string) {
this._faceColor = value;
}
set nameHighlightColor(value: string) {
this._nameHighlightColor = value;
}
set vertexHighlightColor(value: string) {
this._vertexHighlightColor = value;
}
set edgeHighlightColor(value: string) {
this._edgeHighlightColor = value;
}
set faceHighlightColor(value: string) {
this._faceHighlightColor = value;
}
set draggable(value: boolean) {
this._draggable = value;
}
set dimension(value: number) {
this._dimension = value;
}
set align(value: Align) {
this._align = value;
}
set shouldHighlight(value: boolean) {
this._shouldHighlight = value;
}
set visible(value: boolean) {
this._visible = value;
}
set emphasized(value: boolean) {
this._emphasisAmount = value ? 1 : 0;
}
set emphasisAmount(value: number) {
this._emphasisAmount = value < 0 ? 0 : (value > 1 ? 1 : value);
}
set drawProgress(value: number) {
// Clamp to [0, 1] — out-of-range values would push the partial
// geometry past either endpoint, which is never what callers
// mean. Animations tick this in [0, 1] and finalise to 1.
this._drawProgress = value < 0 ? 0 : (value > 1 ? 1 : value);
}
get nameColor(): string {
return this._nameColor;
}
get vertexColor(): string {
return this._vertexColor;
}
set vertexColor(c : string) {
this._vertexColor = c;
}
get edgeColor(): string {
return this._edgeColor;
}
get faceColor(): string {
return this._faceColor;
}
get nameHighlightColor(): string {
return this._nameHighlightColor;
}
get vertexHighlightColor(): string {
return this._vertexHighlightColor;
}
get edgeHighlightColor(): string {
return this._edgeHighlightColor;
}
get faceHighlightColor(): string {
return this._faceHighlightColor;
}
get draggable(): boolean {
return this._draggable;
}
get dimension(): number {
return this._dimension;
}
get align(): Align {
return this._align;
}
get shouldHighlight(): boolean {
return this._shouldHighlight;
}
get visible(): boolean {
return this._visible;
}
get emphasized(): boolean {
return this._emphasisAmount > 0;
}
get emphasisAmount(): number {
return this._emphasisAmount;
}
get drawProgress(): number {
return this._drawProgress;
}
}
|