列车报错修改

src/components/draw-app/dialogs/AddTrainDialog.vue

@@ -57,7 +57,7 @@ import { ref } from 'vue';
 
 const props = defineProps({
   dev: {
-    type: Section || Turnout,
+    type: [Section, Turnout],
     required: true,
   },
   kmLength: {

src/graphics/train/Train.ts

@@ -421,6 +421,9 @@ export class Train extends JlGraphic {
       }
       allLength = Math.abs(B - A);
     }
+    if (allLength == 0) {
+      allLength = 1;
+    }
     if (this.states.headOffset > allLength) {
       console.error('偏移长度超出最大长度');
       return;