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| Title: LineElement.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 {GeomElement} from "../GeomElement";
import {SlateCanvas} from "../../Slate";
interface ILineElementConstructor {
A : PointElement;
B : PointElement;
}
export class LineElement extends GeomElement {
protected _A : PointElement;
get A() : PointElement { return this._A; }
protected _B : PointElement;
get B() : PointElement { return this._B; }
constructor(ile?: ILineElementConstructor) {
super();
this.dimension = 1;
this._A = ile && ile.A || null;
this._B = ile && ile.B || null;
}
public drawEdge(c: HTMLCanvasElement, color?: string): void {
if (!this.visible && !this.shouldHighlight && this.emphasisAmount <= 0) return;
if (color == null) {
if (this.emphasized || this.shouldHighlight) {
color = this.edgeHighlightColor;
} else {
color = this.edgeColor;
}
}
if (color == null) return;
let ctx = c.getContext("2d");
ctx.strokeStyle = color;
// Stroke weight scales smoothly. Baseline is 1 (normal) or 3
// (slide-highlight); emphasisAmount interpolates up to 6 for
// full emphasis. emphasisAmount = 0 → baseline; 1 → 6 px;
// animator fades 1 → 0 over ~250 ms at the end of a transition
// so the post-animation settle isn't a hard pop.
const baseW = this.shouldHighlight ? 3 : 1;
ctx.lineWidth = (baseW + this.emphasisAmount * (6 - baseW)) * GeomElement.styleScale;
// Slide-transition animation: drawProgress < 1 traces only the
// first `progress` fraction of the line A → B. Default 1 keeps
// the full-line behaviour every existing consumer relies on.
let p = this.drawProgress;
let endX = this._A.x + (this._B.x - this._A.x) * p;
let endY = this._A.y + (this._B.y - this._A.y) * p;
ctx.beginPath();
ctx.moveTo(this._A.x, this._A.y);
ctx.lineTo(endX, endY);
ctx.stroke();
}
public drawFace(c: SlateCanvas): void {
}
public drawName(c: SlateCanvas): void {
if (!this.visible && !this.shouldHighlight && this.emphasisAmount <= 0) return;
if (this.nameColor == null || this.name == null) return;
if (this._A == null || !this._A.defined()) return;
if (this._B == null || !this._B.defined()) return;
const ix = Math.round((this._A.x + this._B.x) / 2);
const iy = Math.round((this._A.y + this._B.y) / 2);
this.drawString(ix, iy, c);
}
public drawVertex(c: SlateCanvas): void {
}
public rotate(pivot: PointElement, ac: number, as: number): void {
}
public translate(dx: number, dy: number): void {
}
public update(): void {
}
}
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