JavaScript实现封闭区域布尔运算的示例代码

function getOperatedCurves(sourceCurs: Curve[], targetCus: Curve[])
 {
 let source: Polyline | Circle = (sourceCurs[0] instanceof Circle) ? sourceCurs[0] as Circle : new Polyline().Combine(sourceCurs)[0];
 let target: Polyline | Circle = (targetCus[0] instanceof Circle) ? targetCus[0] as Circle : new Polyline().Combine(targetCus)[0];
 try
 {
 if (!source.IsClose || !target.IsClose) throw new Error("不是封闭曲线");
 }
 catch (err)
 {
 console.log(err);
 }

 let interPts = source.IntersectWith(target, IntersectOption.OnBothOperands);
 let sourceContainerTarget = isTargetCurInSourceCur(source, target);
 let targetContainerSource = isTargetCurInSourceCur(target, source);

 let isContainer = sourceContainerTarget || targetContainerSource;
 let intersectionList: Curve[] = []; //交集
 let unionList: Curve[] = []; //并集
 let subList: Curve[] = []; //补集

 /*
 *两封闭区域有交点并且不是包含关系,则通过交点把区域分割
 */
 if (interPts.length && !isContainer)
 {
 let pars1 = interPts.map(p => source.GetParamAtPoint(p)).sort((a, b) => a - b);
 let pars2 = interPts.map(p => target.GetParamAtPoint(p)).sort((a, b) => a - b);

 let cus1: Array<Polyline | Arc> = source.GetSplitCurves(pars1);

 cus1.forEach(pl =>
 {
 if (isTargetCurInSourceCur(target, pl))
 {
 intersectionList.push(pl);
 }
 else
 {
 subList.push(pl);
 unionList.push(pl);
 }
 })

 let cus2: Array<Polyline | Arc> = target.GetSplitCurves(pars2);
 cus2.forEach(pl =>
 {
 if (isTargetCurInSourceCur(source, pl))
 {
 intersectionList.push(pl);
 subList.push(pl);
 }
 else
 {
 unionList.push(pl);
 }
 })

 }
 else
 {
 if (isContainer)
 {
 if (sourceContainerTarget)
 {
 intersectionList.push(target);
 subList.push(source, target);
 unionList.push(source);
 }
 else
 {
 unionList.push(target);
 intersectionList.push(source);
 }
 }
 else
 {
 unionList.push(source, target)
 subList.push(source);
 }

 }
 return {
 intersectionList, unionList, subList
 }
 }