Math2

Math2 二维数学对象

Members

Methods

staticAngle(x1,y1,x2,y2) → number

计算点1(x1,y1)到点2(x2,y2)的向量与水平x坐标轴之间的夹角，返回弧度

Name	Type	Description
`x1`	number
`y1`	number
`x2`	number
`y2`	number

staticAngleBetween(v0,v1) → number

计算从向量0到向量1之间的张角,逆时针方向为正

Name	Type	Description
`v0`	Vector2
`v1`	Vector2

staticArea(points) → number

计算给定多边形的面积，返回平方米

Name	Type	Description
`points`	Vector2[]	多边形点数组

staticAreaFromEdge(a,b,c) → number

从三角形三边长度计算给定多边形的面积，返回平方米

Name	Type	Description
`a`	number	边长1
`b`	number	边长2
`c`	number	边长3

staticBuffer(points,radius,isRoundJoin,isRoundEnd,isClosed) → Vector2[]

计算给点中心线的缓冲区

Name	Type	Description
`points`	Vector2[]	中心线
`radius`	number	半径米
`isRoundJoin`	boolean	optional是否圆角转弯
`isRoundEnd`	boolean	optional是否圆角端点
`isClosed`	boolean	optional是否闭合

staticBufferPoint(center,radius) → Vector2[]

计算给定点的缓冲区

Name	Type	Description
`radius`	number	半径，单位米

staticCalcInnerPoint(points,pt) → boolean

计算给定多边形内点

Name	Type	Description
`points`	Vector2[]	多边形点数组
`pt`	Vector2	结果内点

staticClipLine(polyPoints,linePoints) → Array<Vector2[]>

用多边形裁剪折线

Name	Type	Description
`polyPoints`	Vector2[]	多边形点
`linePoints`	Vector2[]	折线点

staticClosestPoint(points,pt) → Vector2

计算指定点到折线上最近点的坐标，返回最近点

Name	Type	Description
`points`	Vector2[]	折线点数组
`pt`	Vector2	点

staticClosestPointAdvance(points,pt) → PointOnLine

计算指定点到折线上最近点的坐标，返回最近点信息结构

Name	Type	Description
`points`	Vector2[]	折线点数组
`pt`	Vector2	点

staticContains(polyPoints,point) → boolean

判断算多边形是否包含指定点

Name	Type	Description
`polyPoints`	Vector2[]	多边形点数组
`point`	Vector2	点

staticContainsLine(polyPoints,points) → boolean

判断算多边形是否包含指定折线

Name	Type	Description
`polyPoints`	Vector2[]	多边形点数组
`points`	Vector2[]	折线点数组

staticContainsRect(polyPoints,rect) → boolean

判断算多边形是否包含指定矩形

Name	Type	Description
`polyPoints`	Vector2[]	多边形点数组
`rect`	Rect	矩形

staticDistance(x1,y1,x2,y2) → number

计算两对坐标之间距离

Name	Type	Description
`x1`	number
`y1`	number
`x2`	number
`y2`	number

staticDistanceLineLine(points1,points2) → number

计算两条折线间距离

Name	Type	Description
`points1`	Vector2[]
`points2`	Vector2[]

staticDistancePoint(pt1,pt2) → number

计算两点间距离

Name	Type	Description
`pt1`	Vector2
`pt2`	Vector2

staticDistancePointLine(point,points) → number

计算点到折线距离

Name	Type	Description
`point`	Vector2
`points`	Vector2[]

staticIntersectLine(linePoints1,linePoints2) → Array<Vector2[]>

计算折线1被折线2裁剪的结果，返回折线段数组

Name	Type	Description
`linePoints1`	Vector2[]	折线1
`linePoints2`	Vector2[]	折线2

staticIntersectOnePoint(points1,points2,resultPoint) → boolean

计算两条折线的一个交点。如果不相交返回false

Name	Type	Description
`points1`	Vector2[]
`points2`	Vector2[]
`resultPoint`	Vector2	交点坐标

staticIntersects(linePoints1,linePoints2) → boolean

判断两条折线是否相交

Name	Type	Description
`linePoints1`	Vector2[]	折线1
`linePoints2`	Vector2[]	折线2

staticIntersectSegment(x1,y1,x2,y2,x3,y3,x4,y4,resultPoint) → boolean

判断两个线段是否相交

Name	Type	Description
`x1`	number	线段1起点x坐标
`y1`	number	线段1起点y坐标
`x2`	number	线段1终点x坐标
`y2`	number	线段1终点y坐标
`x3`	number	线段2起点x坐标
`y3`	number	线段2起点y坐标
`x4`	number	线段2终点x坐标
`y4`	number	线段2终点y坐标
`resultPoint`	Vector2	如果相交，则保存相交点坐标

staticIntersectSegmentPoint(pt1,pt2,pt3,pt4,resultPoint) → boolean

判断两个线段是否相交

Name	Type	Description
`pt1`	Vector2	线段1起点
`pt2`	Vector2	线段1终点
`pt3`	Vector2	线段2起点
`pt4`	Vector2	线段2终点
`resultPoint`	Vector2	如果相交，则保存相交点坐标

staticLength(points) → number

计算折线长度

Name	Type	Description
`points`	Vector2[]	折线点数组

staticNearEqual(pt1,pt2,tolerance) → boolean

判断两个二维点是否近似相等

Name	Type	Description
`pt1`	Vector2	点1
`pt2`	Vector2	点2
`tolerance`	number	optional容差

staticNearEqualRect(rect1,rect2,tolerance) → boolean

判断两个矩形是否近似相等

Name	Type	Description
`rect1`	Rect	矩形1
`rect2`	Rect	矩形2
`tolerance`	number	optional容差

staticOverlaps(polyPoints1,polyPoints2) → boolean

判断两个多边形是否有重合范围

Name	Type	Description
`polyPoints1`	Vector2[]	多边形1
`polyPoints2`	Vector2[]	多边形2

staticRectContains(outerRect,innerRect) → boolean

判断第一个矩形是否包含第二个

Name	Type	Description
`outerRect`	Rect	外部矩形
`innerRect`	Rect	内部矩形

staticRectIntersects(rect1,rect2) → boolean

判断两个矩形是否相交

Name	Type	Description
`rect1`	Rect	矩形1
`rect2`	Rect	矩形2

staticRectIntersectsLine(rect,points) → boolean

判断矩形是否与折线相交

Name	Type	Description
`rect`	Rect	矩形
`points`	Vector2[]	折线点数组

staticRectWithin(rect,center,radius) → boolean

判断指定中心点半径的圆是否被矩形包含

Name	Type	Description
`rect`	Rect	矩形
`center`	Vector2	中心点
`radius`	number	半径

staticSquareDistance(x1,y1,x2,y2) → number

两点之间的平方距离，及(x1-x2)*(x1-x2)+(y1-y2)*(y1-y2)。用于快速的裁剪或者排序判断，不需要做开平方运算

Name	Type	Description
`x1`	number
`y1`	number
`x2`	number
`y2`	number

staticSquareDistancePoint(pt1,pt2) → number

两点之间的平方距离

Name	Type	Description
`pt1`	Vector2
`pt2`	Vector2