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SYS_Math.calculatePerimeter() method

Calculate the perimeter of a polygon

Signature

public calculatePerimeter(polygon: TSYS_MathPolygonInput): number;

Parameters

Parameter	Type	Description
polygon	TSYS_MathPolygonInput	Polygon

Returns

number

Perimeter

Example

// 1. 矩形 100 x 80，周长应为 360
const rect = [{ x: 0, y: 0 }, { x: 100, y: 0 }, { x: 100, y: 80 }, { x: 0, y: 80 }];
console.log('矩形周长：', eda.sys_Math.calculatePerimeter(rect));

// 2. L 形轮廓（缺口裁掉一个角，周长按实际边界累加）
const lShape = [
  { x: 0, y: 0 }, { x: 100, y: 0 }, { x: 100, y: 40 },
  { x: 40, y: 40 }, { x: 40, y: 80 }, { x: 0, y: 80 },
];
console.log('L 形轮廓周长：', eda.sys_Math.calculatePerimeter(lShape));

// 3. 布尔运算返回的多边形组同样可以作为输入
const hole = [{ x: 30, y: 20 }, { x: 70, y: 20 }, { x: 70, y: 60 }, { x: 30, y: 60 }];
const cut = eda.sys_Math.subtract(rect, hole);
console.log('挖孔后多边形组的周长：', eda.sys_Math.calculatePerimeter(cut));