改回以左下角为基准计算坐标，但是多行文本的问题无法解决

src/qelmt/dynamictext.rs

@@ -159,9 +159,9 @@ impl From<&DynamicText> for XMLElement {
         
         // 根据垂直对齐方式计算顶部的y坐标
         let top_y = match txt.v_alignment {
-            VAlignment::Top => txt.align_y + pt_size / 2.0,
-            VAlignment::Center => txt.align_y - pt_size / 2.0,
-            VAlignment::Bottom => txt.align_y - pt_size + pt_size / 2.0,
+            VAlignment::Top => txt.y + pt_size / 2.0,
+            VAlignment::Center => txt.y - pt_size / 2.0,
+            VAlignment::Bottom => txt.y - pt_size + pt_size / 2.0,
         };
 
         println!("左上角位置: x={}, y={}", left_x, top_y);