fix(layer): 去除线图层绘制异常的问题

处理线图层数据存在重复点的时候，绘制的线图层粗细表现异常的问题。

packages/layers/src/utils/extrude_polyline.ts

@@ -22,15 +22,26 @@ export function computeMiter(
 export function computeNormal(out: vec2, dir: vec2) {
   return vec2.set(out, -dir[1], dir[0]);
 }
+
 export function direction(out: vec2, a: vec2, b: vec2) {
   vec2.sub(out, a, b);
   vec2.normalize(out, out);
   return out;
 }
+
 function isPointEqual(a: vec2, b: vec2) {
   return a[0] === b[0] && a[1] === b[1];
 }
 
+function getArrayUnique(matrix: number[][]) {
+  const result: number[][] = [];
+  matrix.map((item) => {
+    item.sort((a, b) => b - a);
+    result.push(item);
+  });
+  return result;
+}
+
 export interface IExtrudeLineOption {
   join: string;
   cap: string;
@@ -80,16 +91,14 @@ export default class ExtrudePolyline {
     this.started = false;
     this.normal = null;
     this.totalDistance = 0;
+    // 去除数组里重复的点
+    points = getArrayUnique(points);
     const total = points.length;
     let count = complex.startIndex;
     for (let i = 1; i < total; i++) {
       const last = points[i - 1] as vec2;
       const cur = points[i] as vec2;
       const next = i < points.length - 1 ? points[i + 1] : null;
-      // 如果当前点和前一点相同，跳过
-      if (isPointEqual(last, cur)) {
-        continue;
-      }
       const amt = this.segment(complex, count, last, cur, next as vec2);
       count += amt;
     }