Press n or j to go to the next uncovered block, b, p or k for the previous block.
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| Title: Perpendicular.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";
import {LineElement} from "./LineElement";
import {PlaneElement} from "../plane/PlaneElement";
export interface IPerpendicularElementConstructor {
C : PointElement;
D : PointElement;
P : PlaneElement;
E : PointElement;
F : PointElement;
}
export class Perpendicular extends LineElement {
// draw perpendicular to CD in the plane P. A is the proj of
// C onto P, while AB is perpendicular to CD and equals EF.
protected _C : PointElement;
protected _D : PointElement;
protected _E : PointElement;
protected _F : PointElement;
protected _P : PlaneElement;
constructor(ipe?: IPerpendicularElementConstructor) {
super();
this.dimension = 1;
if(ipe == null) return;
this._P = ipe.P;
this._A = new PointElement({AP: ipe.P});
this._B = new PointElement({AP: ipe.P});
this._C = ipe.C;
this._D = ipe.D;
this._E = ipe.E;
this._F = ipe.F;
}
public rotate(pivot: PointElement, ac: number, as: number): void {
this.A.rotate(pivot, ac, as);
this.B.rotate(pivot, ac, as);
}
public translate(dx: number, dy: number): void {
this.A.translate(dx,dy);
this.B.translate(dx,dy);
}
public update(): void {
this._A.to(this._C).toPlane(this._P);
this._B.to(this._D).minus(this._A);
let Bs : number = PointElement.dot(this.B,this._P.S);
let Bt : number = PointElement.dot(this.B,this._P.T);
let factor : number = Math.sqrt(this._E.distance2(this._F)/(Bs*Bs+Bt*Bt));
Bs = -Bs/factor;
Bt /= factor;
this._B.x = Bt*this._P.S.x + Bs*this._P.T.x + this._A.x;
this._B.y = Bt*this._P.S.y + Bs*this._P.T.y + this._A.y;
this._B.z = Bt*this._P.S.z + Bs*this._P.T.z + this._A.z;
}
}
|