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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";
export type SlateCanvas = HTMLCanvasElement | Canvas;
export class Slate {
protected _elements : GeomElement[];
protected _elementsForUpdate : GeomElement[];
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 = [];
this._elementsForUpdate = [];
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);
}
this._elementsForUpdate = [...this._elements];
let slate = this;
let cnv : HTMLCanvasElement = this._canvas as HTMLCanvasElement;
this._htmlCanvas = cnv;
if(this._htmlCanvas.addEventListener == null) return;
this._htmlCanvas.addEventListener("mousedown", (ev) => {
let [x, y] : number[] = this._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseDown(x, y);
});
this._htmlCanvas.addEventListener("mouseup", (ev) => {
let [x, y] : number[] = this._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseUp(x, y);
});
this._htmlCanvas.addEventListener("mousemove", (ev) => {
let [x, y] : number[] = this._getCanvasPosition(ev.clientX, ev.clientY);
slate._onMouseDrag(x, y);
});
for(let [tEvent, mEvent] of [
["touchend", "mouseup"],
["touchstart", "mousedown"],
["touchmove", "mousemove"]
]) {
this._htmlCanvas.addEventListener(tEvent, (tv : TouchEvent) => {
let pos = slate._getTouchPos(tv);
let me = new MouseEvent(mEvent,
{clientX: pos[0], clientY: pos[1]});
slate._htmlCanvas.dispatchEvent(me);
});
}
for(let eventType of ["touchstart", "touchmove", "touchend"]) {
document.body.addEventListener(eventType, (tv) => {
if (tv.target == slate._htmlCanvas) {
tv.preventDefault();
}
}, false);
}
}
_getTouchPos(te : TouchEvent) : [number, number] {
if (this._htmlCanvas == null) return;
let r = this._htmlCanvas.getBoundingClientRect();
return [te.touches[0].clientX - r.left,
te.touches[0].clientY - r.top];
}
_getCanvasPosition(x: number, y: number) : [number, number] {
let r = this._htmlCanvas.getBoundingClientRect();
return [x - r.left,
y - r.top];
}
_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;
}
get elementsForUpdate() : GeomElement[] {
return this._elementsForUpdate;
}
set bgcolor(value: string ) {
this._bgcolor = value;
}
get bgcolor() : string {
return this._bgcolor;
}
lookupElement(name: string) : GeomElement {
for (let elem of this._elements) {
if (elem.name == name) {
return elem;
}
}
return null;
}
// 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.
convertParams(params: any[]) : 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 )
throw new TypeError(`Element with name ${param} not found.`);
if (g instanceof PointElement) {
P.push(g);
} else if (g instanceof LineElement) {
// LineElement expands to two PointElements (matching Java)
P.push(g.A);
P.push(g.B);
} else {
E.push(g);
}
break;
case "number":
N.push(param);
break;
default:
throw new TypeError("Expecting only named elements (strings) or numbers.");
}
}
return {P, E, N};
}
findConstruction(cm : AllConstructions, sp: SortedParams) : Construction {
for(let c of constructions) {
if(c.validateSignature(cm, sp)) {
return c;
}
}
return null;
}
createElement(cm : AllConstructions, params: any[], name?: string) : GeomElement {
let sp : SortedParams = this.convertParams(params);
let c : Construction = this.findConstruction(cm, sp);
if(c == null) {
let cName : String = getConstructionName(cm);
if (name == null) {
name = "";
}
throw new TypeError(`Construction not found for "${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._elementsForUpdate.indexOf(elem) == -1)
this._elementsForUpdate.push(elem);
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._elementsForUpdate) element.update();
this.drawElements();
}
drawElements(): void {
if(this.inTest) return;
// we draw all the elements first
let w = this._canvas.width;
let h = this._canvas.height;
let ctx : CanvasRenderingContext2D = this._canvas.getContext("2d") as CanvasRenderingContext2D;
ctx.clearRect(0,0,w,h);
ctx.fillStyle = this._bgcolor;
ctx.fillRect(0,0,w,h);
for(let element of this._elements) element.drawFace(this._canvas);
for(let element of this._elements) element.drawEdge(this._canvas);
for(let element of this._elements) element.drawVertex(this._canvas);
// and then draw their names.
for(let element of this._elements)
element.drawName(this._canvas);
}
// 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);
let w : number = this._canvas.width;
if (c < 0) c = 0;
else if (c > w) c = w;
let h : number = this._canvas.height;
if (d < 0) d = 0;
else if (d > h) d = h;
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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