画布裁剪功能改为自选

src/component/HomePage/ExportModel.vue

@@ -687,32 +687,46 @@ export default defineComponent({
 				lockRotation: true,
 			});
 		}
-		let setExportCanvas = ()=>{
-			var objects = canvas.getObjects();
-			var maxHeight = 0;
-
-			// 计算所有对象的最大高度
-			objects.forEach(function(obj) {
-				var objBottom = obj.top + obj.height*obj.scaleY;
-				if (objBottom > maxHeight) {
-					maxHeight = objBottom;
-				}
-			});
-			canvasWH.height = maxHeight+30
-			// 调整 Canvas 的高度
-			canvas.setDimensions({ height: canvasWH.height });
-
-			// 重新渲染 Canvas
+		let setExportCanvas = async ()=>{
+			await calculateHeight()
+			canvas.setDimensions({ height: canvasWH.value.height });
 			canvas.renderAll();
 			return canvas.toDataURL({
-                format: "png", // 导出格式为 PNG
-                quality: 1, // 图片质量为 1（最高质量）
-            });
+				format: "png", // 导出格式为 PNG
+				quality: 1, // 图片质量为 1（最高质量）
+			});
+		}
+		let calculateHeight = ()=>{
+			return new Promise((resolve, reject) =>{
+				var objects = canvas.getObjects();
+				var maxHeight = 0;
+				Modal.confirm({
+					title: useI18.t('exportModel.jsContent8'),
+					okText: 'Yes',
+					cancelText: 'No',
+					mask:false,
+					centered:true,
+					onOk() {
+						objects.forEach(function(obj) {
+							var objBottom = obj.top + obj.height*obj.scaleY;
+							if (objBottom > maxHeight) {
+								maxHeight = objBottom;
+							}
+						});
+						canvasWH.value.height = Math.round(maxHeight)+30
+						
+						resolve(canvasWH.value.height)
+					},
+					onCancel(){
+						resolve(canvasWH.value.height)
+					}
+				});
+			})
 		}
         //设置导出
         let setExport = async () => {
 			initAligningGuidelines(canvas,false)
-            var imageDataURL = setExportCanvas()
+            var imageDataURL = await setExportCanvas()
             let a = document.createElement("a");
             let img = [];
             let index = 0;
@@ -1829,11 +1843,11 @@ export default defineComponent({
 		let toSvg = ()=>{
 			// console.log(canvas.toSvg());
 		}
-		let setShare = ()=>{
+		let setShare = async ()=>{
 			initAligningGuidelines(canvas,false)
 			let publishModal = publish.value
 			publishModal.publishMask = true
-			var imageDataURL = setExportCanvas()
+			var imageDataURL = await setExportCanvas()
 			let data = {
 				"imgUrl":imageDataURL,
 				userlikeGroupId:userlikeGroupId,