ZigZag path onMouseDrag with paper.js

Question

我试图使用path .js的onMouseDrag函数创建一个之字形路径，但是这里有一个草图

和代码

var path
var zigzag
var length
var count
var delta=[]
tool.fixedDistance= 20
function onMouseDown(event){
path= new Path()
path.add(event.point)
zigzag= new Path()
}
function onMouseDrag(event){
event.delta += 90
path.add(event.delta)
delta.push(event.delta)
}
function onMouseUp(event){
length= path.segments.length
zigzag= new Path()
zigzag.add(event.point)
console.log(delta)
delta.forEach(( zig , i) => {
zigzag.add(i % 2 == 0 ? zig + 20 : zig - 20)
})
zigzag.selected= true
}

Answer 1

根据我之前的回答，这里有一个草图来演示一种可能的方法。

let line;
let zigZag;
function onMouseDown(event) {
line = new Path({
segments: [event.point, event.point],
strokeColor: 'black'
});
zigZag = createZigZagFromLine(line);
}
function onMouseDrag(event) {
line.lastSegment.point = event.point;
if (zigZag) {
zigZag.remove();
}
zigZag = createZigZagFromLine(line);
}
function createZigZagFromLine(line) {
const zigZag = new Path({ selected: true });
const count = 20, length = line.length;
for (let i = 0; i <= count; i++) {
const offset = i / count * length;
const normal = i === 0 || i === count
? new Point(0, 0)
: line.getNormalAt(offset) * 30;
const point = line.getPointAt(offset).add(i % 2 == 0 ? normal
: -normal);
zigZag.add(point);
}
return zigZag;
}