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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";
export class PolygonElement extends GeomElement {
public V : PointElement[];
constructor(ps?: PointElement[]) {
super();
this.dimension = 2;
if (ps == null) {
this.V = [];
return;
}
this.V = ps;
}
public area() : number {
// Ported from PolygonElement.java area() — 2026-04-12
// Compute the area of this polygon (assuming it's planar & convex).
// Uses fan triangulation from V[0].
let sum = 0.0;
for (let i = 0; i < this.V.length - 2; ++i) {
sum += PointElement.area(this.V[0], this.V[i + 1], this.V[i + 2]);
}
return sum;
}
public drawEdge(c: HTMLCanvasElement, color?: string): void {
if (color == null) {
if (this.shouldHighlight) {
color = this.edgeHighlightColor;
} else {
color = this.edgeColor;
}
}
if (color == null) return;
if (this.V.length <= 1) return;
let ctx = c.getContext("2d");
ctx.beginPath();
ctx.strokeStyle = color;
let firstPoint = this.V[0];
let rest = this.V.slice(1);
ctx.moveTo(firstPoint.x, firstPoint.y);
for(let vertex of rest) {
ctx.lineTo(vertex.x, vertex.y);
ctx.stroke();
}
if (this.V.length > 2) {
ctx.lineTo(firstPoint.x, firstPoint.y);
ctx.stroke();
}
}
public defined() : boolean {
if (this.V.length == 0) return false;
for(let v of this.V) {
if (!v.defined()) return false;
}
return true;
}
public drawFace(c: SlateCanvas): void {
if(this.faceColor != null && this.defined() && this.V.length > 2) {
let ctx : CanvasRenderingContext2D = c.getContext("2d") as CanvasRenderingContext2D;
ctx.beginPath();
ctx.fillStyle = this.faceColor;
let firstPoint = this.V[0];
let rest = this.V.slice(1);
ctx.moveTo(firstPoint.x, firstPoint.y);
for(let vertex of rest)
ctx.lineTo(vertex.x, vertex.y);
ctx.closePath();
ctx.fill();
}
}
public drawName(c: SlateCanvas): void {
if (this.nameColor != null && this.name != null && this.defined()) {
let x : number = 0;
let y : number = 0;
for(let v of this.V) {
x += v.x;
y += v.y;
}
let n : number = this.V.length;
x = x / n;
y = y / n;
let ctx : CanvasRenderingContext2D = c.getContext("2d") as CanvasRenderingContext2D;
let [w, h] = this._getTextMetrics(ctx, this._name);
ctx.beginPath();
ctx.fillStyle = this.nameColor;
ctx.fillText(this._name, x - w/2., y + h/4.);
}
}
public drawVertex(c: SlateCanvas): void {
if (this.vertexColor != null && this.defined() ) {
for(let v of this.V) {
v.drawVertex(c, this.vertexColor);
}
}
}
public rotate(pivot: PointElement, ac: number, as: number): void {
}
public translate(dx: number, dy: number): void {
}
public update(): void {
}
}
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