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tengge 2020-06-07 08:25:32 +08:00
parent a2ccf3e145
commit 3bb8ab65fa

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@ -1,5 +1,3 @@
// +build ignore
// Copyright 2017-2020 The ShadowEditor Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
@ -12,232 +10,184 @@
package three
/**
* @author bhouston / http://clara.io
*/
import (
"math"
)
var _vector = Vector2{}
function Box2( min, max ) {
this.min = ( min !== undefined ) ? min : new Vector2( + Infinity, + Infinity );
this.max = ( max !== undefined ) ? max : new Vector2( - Infinity, - Infinity );
var _vector = NewVector2(0, 0)
// NewBox2 :
func NewBox2(min, max Vector2) *Box2 {
return &Box2{min, max}
}
Object.assign( Box2.prototype, {
set: function ( min, max ) {
this.min.copy( min );
this.max.copy( max );
return this;
},
setFromPoints: function ( points ) {
this.makeEmpty();
for ( var i = 0, il = points.length; i < il; i ++ ) {
this.expandByPoint( points[ i ] );
}
return this;
},
setFromCenterAndSize: function ( center, size ) {
var halfSize = _vector.copy( size ).multiplyScalar( 0.5 );
this.min.copy( center ).sub( halfSize );
this.max.copy( center ).add( halfSize );
return this;
},
clone: function () {
return new this.constructor().copy( this );
},
copy: function ( box ) {
this.min.copy( box.min );
this.max.copy( box.max );
return this;
},
makeEmpty: function () {
this.min.x = this.min.y = + Infinity;
this.max.x = this.max.y = - Infinity;
return this;
},
isEmpty: function () {
// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes
return ( this.max.x < this.min.x ) || ( this.max.y < this.min.y );
},
getCenter: function ( target ) {
if ( target === undefined ) {
console.warn( 'THREE.Box2: .getCenter() target is now required' );
target = new Vector2();
}
return this.isEmpty() ? target.set( 0, 0 ) : target.addVectors( this.min, this.max ).multiplyScalar( 0.5 );
},
getSize: function ( target ) {
if ( target === undefined ) {
console.warn( 'THREE.Box2: .getSize() target is now required' );
target = new Vector2();
}
return this.isEmpty() ? target.set( 0, 0 ) : target.subVectors( this.max, this.min );
},
expandByPoint: function ( point ) {
this.min.min( point );
this.max.max( point );
return this;
},
expandByVector: function ( vector ) {
this.min.sub( vector );
this.max.add( vector );
return this;
},
expandByScalar: function ( scalar ) {
this.min.addScalar( - scalar );
this.max.addScalar( scalar );
return this;
},
containsPoint: function ( point ) {
return point.x < this.min.x || point.x > this.max.x ||
point.y < this.min.y || point.y > this.max.y ? false : true;
},
containsBox: function ( box ) {
return this.min.x <= box.min.x && box.max.x <= this.max.x &&
this.min.y <= box.min.y && box.max.y <= this.max.y;
},
getParameter: function ( point, target ) {
// This can potentially have a divide by zero if the box
// has a size dimension of 0.
if ( target === undefined ) {
console.warn( 'THREE.Box2: .getParameter() target is now required' );
target = new Vector2();
}
return target.set(
( point.x - this.min.x ) / ( this.max.x - this.min.x ),
( point.y - this.min.y ) / ( this.max.y - this.min.y )
);
},
intersectsBox: function ( box ) {
// using 4 splitting planes to rule out intersections
return box.max.x < this.min.x || box.min.x > this.max.x ||
box.max.y < this.min.y || box.min.y > this.max.y ? false : true;
},
clampPoint: function ( point, target ) {
if ( target === undefined ) {
console.warn( 'THREE.Box2: .clampPoint() target is now required' );
target = new Vector2();
}
return target.copy( point ).clamp( this.min, this.max );
},
distanceToPoint: function ( point ) {
var clampedPoint = _vector.copy( point ).clamp( this.min, this.max );
return clampedPoint.sub( point ).length();
},
intersect: function ( box ) {
this.min.max( box.min );
this.max.min( box.max );
return this;
},
union: function ( box ) {
this.min.min( box.min );
this.max.max( box.max );
return this;
},
translate: function ( offset ) {
this.min.add( offset );
this.max.add( offset );
return this;
},
equals: function ( box ) {
return box.min.equals( this.min ) && box.max.equals( this.max );
// Box2 :
type Box2 struct {
Min Vector2
Max Vector2
}
// Set :
func (b Box2) Set(min, max Vector2) *Box2 {
b.Min.Copy(min)
b.Max.Copy(max)
return &b
}
// SetFromPoints :
func (b Box2) SetFromPoints(points []Vector2) *Box2 {
b.MakeEmpty()
for i, il := 0, len(points); i < il; i++ {
b.ExpandByPoint(points[i])
}
} );
return &b
}
// SetFromCenterAndSize :
func (b Box2) SetFromCenterAndSize(center, size Vector2) *Box2 {
halfSize := _vector.Copy(size).MultiplyScalar(0.5)
b.Min.Copy(center).Sub(*halfSize)
b.Max.Copy(center).Add(*halfSize)
return &b
}
// Clone :
func (b Box2) Clone() *Box2 {
return b.Copy(b)
}
// Copy :
func (b Box2) Copy(box Box2) *Box2 {
b.Min.Copy(box.Min)
b.Max.Copy(box.Max)
return &b
}
// MakeEmpty :
func (b Box2) MakeEmpty() *Box2 {
b.Min.X, b.Min.Y = math.Inf(1), math.Inf(1)
b.Max.X, b.Max.Y = math.Inf(-1), math.Inf(-1)
return &b
}
// IsEmpty :
func (b Box2) IsEmpty() bool {
// this is a more robust check for empty than ( volume <= 0 ) because volume can get positive with two negative axes
return b.Max.X < b.Min.X || b.Max.Y < b.Min.Y
}
// GetCenter :
func (b Box2) GetCenter(target Vector2) *Vector2 {
if b.IsEmpty() {
return target.Set(0, 0)
}
return target.AddVectors(b.Min, b.Max).MultiplyScalar(0.5)
}
// GetSize :
func (b Box2) GetSize(target Vector2) *Vector2 {
if b.IsEmpty() {
return target.Set(0, 0)
}
return target.SubVectors(b.Max, b.Min)
}
// ExpandByPoint :
func (b Box2) ExpandByPoint(point Vector2) *Box2 {
b.Min.Min(point)
b.Max.Max(point)
return &b
}
// ExpandByVector :
func (b Box2) ExpandByVector(vector Vector2) *Box2 {
b.Min.Sub(vector)
b.Max.Add(vector)
return &b
}
// ExpandByScalar :
func (b Box2) ExpandByScalar(scalar float64) *Box2 {
b.Min.AddScalar(-scalar)
b.Max.AddScalar(scalar)
return &b
}
// ContainsPoint :
func (b Box2) ContainsPoint(point Vector2) bool {
return !(point.X < b.Min.X || point.X > b.Max.X ||
point.Y < b.Min.Y || point.Y > b.Max.Y)
}
// ContainsBox :
func (b Box2) ContainsBox(box Box2) bool {
return b.Min.X <= box.Min.X && box.Max.X <= b.Max.X &&
b.Min.Y <= box.Min.Y && box.Max.Y <= b.Max.Y
}
// GetParameter :
func (b Box2) GetParameter(point, target Vector2) *Vector2 {
// This can potentially have a divide by zero if the box
// has a size dimension of 0.
return target.Set(
(point.X-b.Min.X)/(b.Max.X-b.Min.X),
(point.Y-b.Min.Y)/(b.Max.Y-b.Min.Y),
)
}
// IntersectsBox :
func (b Box2) IntersectsBox(box Box2) bool {
// using 4 splitting planes to rule out intersections
return !(box.Max.X < b.Min.X || box.Min.X > b.Max.X ||
box.Max.Y < b.Min.Y || box.Min.Y > b.Max.Y)
}
// ClampPoint :
func (b Box2) ClampPoint(point, target Vector2) *Vector2 {
return target.Copy(point).Clamp(b.Min, b.Max)
}
// DistanceToPoint :
func (b Box2) DistanceToPoint(point Vector2) float64 {
clampedPoint := _vector.Copy(point).Clamp(b.Min, b.Max)
return clampedPoint.Sub(point).Length()
}
// Intersect :
func (b Box2) Intersect(box Box2) *Box2 {
b.Min.Max(box.Min)
b.Max.Min(box.Max)
return &b
}
// Union :
func (b Box2) Union(box Box2) *Box2 {
b.Min.Min(box.Min)
b.Max.Max(box.Max)
return &b
}
// Translate :
func (b Box2) Translate(offset Vector2) *Box2 {
b.Min.Add(offset)
b.Max.Add(offset)
return &b
}
// Equals :
func (b Box2) Equals(box Box2) bool {
return box.Min.Equals(b.Min) && box.Max.Equals(b.Max)
}