Home > SYS_Math > distanceToPoint

SYS_Math.distanceToPoint() method

Calculate the shortest distance from a point to the polygon boundary

Signature

public distanceToPoint(polygon: TSYS_MathPolygonInput, point: ISYS_MathPoint): number;

Parameters

Parameter	Type	Description
polygon	TSYS_MathPolygonInput	Polygon
point	ISYS_MathPoint	The point to calculate

Returns

number

Shortest distance. If the point is inside the polygon, 0 is returned

Example

// 1. 定义矩形区域（右边界在 x = 100）
const zone = [{ x: 0, y: 0 }, { x: 100, y: 0 }, { x: 100, y: 80 }, { x: 0, y: 80 }];

// 2. 外部点：到右边界的水平距离为 50
const outsidePoint = { x: 150, y: 40 };
console.log('外部点到边界的最短距离：', eda.sys_Math.distanceToPoint(zone, outsidePoint));

// 3. 内部点：在多边形内部时返回 0
const insidePoint = { x: 50, y: 40 };
console.log('内部点到边界的最短距离：', eda.sys_Math.distanceToPoint(zone, insidePoint));

// 4. 斜向最近边不是正对的那条边时，结果取真实垂线距离
const diagonalPoint = { x: 130, y: 110 };
console.log('斜向点到边界的最短距离：', eda.sys_Math.distanceToPoint(zone, diagonalPoint));