refactor: better preview

src/components/md-deck/PltPreview.tsx

@@ -154,9 +154,8 @@ export function PltPreview(props: PltPreviewProps) {
                 <path
                   d={travelPathD()}
                   fill="none"
-                  stroke="#999"
-                  stroke-width="0.2"
-                  stroke-dasharray="2 2"
+                  stroke="#f884"
+                  stroke-width="1"
                 />
               </Show>
 

src/plotcutter/contour.ts

@@ -203,7 +203,7 @@ export function getPointOnPath(points: [number, number][], progress: number): [n
  * @param points 轮廓点数组
  * @param closed 是否闭合路径
  */
-export function contourToSvgPath(points: [number, number][], closed = true): string {
+export function contourToSvgPath(points: [number, number][], closed = false): string {
   if (points.length === 0) return '';
 
   const [startX, startY] = points[0];