const ClipperLib = require('clipper-lib');
// 创建 ClipperLib 对象
const clipper = new ClipperLib.Clipper();
// 定义原始线条
const originalLine = [
{ X: 0, Y: 0 },
{ X: 1, Y: 2 },
{ X: 2, Y: 4 },
{ X: 3, Y: 6 },
{ X: 4, Y: 8 },
{ X: 5, Y: 10 },
];
// 指定保留的点的比例
const keepRatio = 0.5; // 保留 50% 的点
// 计算新的线条
const reducedLine = reduceLine(originalLine, keepRatio);
// 打印结果
console.log('Original Line:', originalLine);
console.log('Reduced Line:', reducedLine);
// 减少线条上的点
function reduceLine(line, ratio) {
if (ratio >= 1.0) {
return line; // 不需要减少点
}
const newLine = [line[0]]; // 保留起点
let accumulatedDistance = 0;
const totalDistance = calculateLineLength(line);
for (let i = 1; i < line.length - 1; i++) {
const segmentStart = line[i - 1];
const segmentEnd = line[i];
const segmentDistance = calculateDistance(segmentStart, segmentEnd);
accumulatedDistance += segmentDistance;
if (accumulatedDistance / totalDistance >= ratio) {
newLine.push(segmentEnd);
accumulatedDistance = 0;
}
}
newLine.push(line[line.length - 1]); // 保留终点
return newLine;
}
// 计算线条长度
function calculateLineLength(line) {
let length = 0;
for (let i = 1; i < line.length; i++) {
length += calculateDistance(line[i - 1], line[i]);
}
return length;
}
// 计算两点之间的距离
function calculateDistance(point1, point2) {
const dx = point2.X - point1.X;
const dy = point2.Y - point1.Y;
return Math.sqrt(dx * dx + dy * dy);
}