245 lines
4.1 KiB
JavaScript
245 lines
4.1 KiB
JavaScript
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import { Vector2 } from './Vector2.js';
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/**
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* @author bhouston / http://clara.io
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*/
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function Box2( min, max ) {
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this.min = ( min !== undefined ) ? min : new Vector2( + Infinity, + Infinity );
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this.max = ( max !== undefined ) ? max : new Vector2( - Infinity, - Infinity );
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}
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Object.assign( Box2.prototype, {
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set: function ( min, max ) {
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this.min.copy( min );
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this.max.copy( max );
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return this;
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},
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setFromPoints: function ( points ) {
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this.makeEmpty();
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for ( var i = 0, il = points.length; i < il; i ++ ) {
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this.expandByPoint( points[ i ] );
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}
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return this;
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},
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setFromCenterAndSize: function () {
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var v1 = new Vector2();
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return function setFromCenterAndSize( center, size ) {
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var halfSize = v1.copy( size ).multiplyScalar( 0.5 );
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this.min.copy( center ).sub( halfSize );
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this.max.copy( center ).add( halfSize );
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return this;
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};
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}(),
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clone: function () {
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return new this.constructor().copy( this );
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},
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copy: function ( box ) {
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this.min.copy( box.min );
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this.max.copy( box.max );
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return this;
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},
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makeEmpty: function () {
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this.min.x = this.min.y = + Infinity;
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this.max.x = this.max.y = - Infinity;
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return this;
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},
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isEmpty: function () {
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// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes
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return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y );
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},
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getCenter: function ( target ) {
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if ( target === undefined ) {
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console.warn( 'THREE.Box2: .getCenter() target is now required' );
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target = new Vector2();
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}
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return this.isEmpty() ? target.set( 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );
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},
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getSize: function ( target ) {
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if ( target === undefined ) {
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console.warn( 'THREE.Box2: .getSize() target is now required' );
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target = new Vector2();
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}
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return this.isEmpty() ? target.set( 0, 0 ) : target.subVectors( this.max, this.min );
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},
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expandByPoint: function ( point ) {
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this.min.min( point );
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this.max.max( point );
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return this;
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},
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expandByVector: function ( vector ) {
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this.min.sub( vector );
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this.max.add( vector );
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return this;
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},
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expandByScalar: function ( scalar ) {
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this.min.addScalar( - scalar );
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this.max.addScalar( scalar );
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return this;
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},
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containsPoint: function ( point ) {
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return point.x < this.min.x || point.x > this.max.x ||
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point.y < this.min.y || point.y > this.max.y ? false : true;
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},
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containsBox: function ( box ) {
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return this.min.x <= box.min.x && box.max.x <= this.max.x &&
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this.min.y <= box.min.y && box.max.y <= this.max.y;
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},
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getParameter: function ( point, target ) {
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// This can potentially have a divide by zero if the box
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// has a size dimension of 0.
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if ( target === undefined ) {
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console.warn( 'THREE.Box2: .getParameter() target is now required' );
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target = new Vector2();
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}
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return target.set(
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( point.x - this.min.x ) / ( this.max.x - this.min.x ),
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( point.y - this.min.y ) / ( this.max.y - this.min.y )
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);
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},
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intersectsBox: function ( box ) {
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// using 4 splitting planes to rule out intersections
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return box.max.x < this.min.x || box.min.x > this.max.x ||
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box.max.y < this.min.y || box.min.y > this.max.y ? false : true;
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},
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clampPoint: function ( point, target ) {
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if ( target === undefined ) {
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console.warn( 'THREE.Box2: .clampPoint() target is now required' );
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target = new Vector2();
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}
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return target.copy( point ).clamp( this.min, this.max );
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},
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distanceToPoint: function () {
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var v1 = new Vector2();
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return function distanceToPoint( point ) {
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var clampedPoint = v1.copy( point ).clamp( this.min, this.max );
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return clampedPoint.sub( point ).length();
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};
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}(),
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intersect: function ( box ) {
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this.min.max( box.min );
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this.max.min( box.max );
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return this;
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},
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union: function ( box ) {
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this.min.min( box.min );
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this.max.max( box.max );
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return this;
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},
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translate: function ( offset ) {
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this.min.add( offset );
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this.max.add( offset );
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return this;
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},
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equals: function ( box ) {
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return box.min.equals( this.min ) && box.max.equals( this.max );
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}
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} );
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export { Box2 };
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