157 lines
2.7 KiB
JavaScript
157 lines
2.7 KiB
JavaScript
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import { Curve } from '../core/Curve.js';
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import { Vector2 } from '../../math/Vector2.js';
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class EllipseCurve extends Curve {
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constructor( aX = 0, aY = 0, xRadius = 1, yRadius = 1, aStartAngle = 0, aEndAngle = Math.PI * 2, aClockwise = false, aRotation = 0 ) {
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super();
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this.type = 'EllipseCurve';
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this.aX = aX;
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this.aY = aY;
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this.xRadius = xRadius;
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this.yRadius = yRadius;
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this.aStartAngle = aStartAngle;
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this.aEndAngle = aEndAngle;
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this.aClockwise = aClockwise;
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this.aRotation = aRotation;
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}
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getPoint( t, optionalTarget ) {
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const point = optionalTarget || new Vector2();
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const twoPi = Math.PI * 2;
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let deltaAngle = this.aEndAngle - this.aStartAngle;
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const samePoints = Math.abs( deltaAngle ) < Number.EPSILON;
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// ensures that deltaAngle is 0 .. 2 PI
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while ( deltaAngle < 0 ) deltaAngle += twoPi;
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while ( deltaAngle > twoPi ) deltaAngle -= twoPi;
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if ( deltaAngle < Number.EPSILON ) {
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if ( samePoints ) {
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deltaAngle = 0;
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} else {
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deltaAngle = twoPi;
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}
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}
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if ( this.aClockwise === true && ! samePoints ) {
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if ( deltaAngle === twoPi ) {
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deltaAngle = - twoPi;
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} else {
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deltaAngle = deltaAngle - twoPi;
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}
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}
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const angle = this.aStartAngle + t * deltaAngle;
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let x = this.aX + this.xRadius * Math.cos( angle );
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let y = this.aY + this.yRadius * Math.sin( angle );
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if ( this.aRotation !== 0 ) {
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const cos = Math.cos( this.aRotation );
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const sin = Math.sin( this.aRotation );
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const tx = x - this.aX;
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const ty = y - this.aY;
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// Rotate the point about the center of the ellipse.
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x = tx * cos - ty * sin + this.aX;
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y = tx * sin + ty * cos + this.aY;
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}
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return point.set( x, y );
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}
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copy( source ) {
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super.copy( source );
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this.aX = source.aX;
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this.aY = source.aY;
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this.xRadius = source.xRadius;
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this.yRadius = source.yRadius;
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this.aStartAngle = source.aStartAngle;
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this.aEndAngle = source.aEndAngle;
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this.aClockwise = source.aClockwise;
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this.aRotation = source.aRotation;
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return this;
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}
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toJSON() {
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const data = super.toJSON();
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data.aX = this.aX;
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data.aY = this.aY;
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data.xRadius = this.xRadius;
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data.yRadius = this.yRadius;
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data.aStartAngle = this.aStartAngle;
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data.aEndAngle = this.aEndAngle;
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data.aClockwise = this.aClockwise;
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data.aRotation = this.aRotation;
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return data;
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}
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fromJSON( json ) {
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super.fromJSON( json );
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this.aX = json.aX;
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this.aY = json.aY;
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this.xRadius = json.xRadius;
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this.yRadius = json.yRadius;
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this.aStartAngle = json.aStartAngle;
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this.aEndAngle = json.aEndAngle;
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this.aClockwise = json.aClockwise;
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this.aRotation = json.aRotation;
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return this;
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}
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}
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EllipseCurve.prototype.isEllipseCurve = true;
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export { EllipseCurve };
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