diff --git a/src/qelmt/dynamictext.rs b/src/qelmt/dynamictext.rs
index c186e6f..8253799 100644
--- a/src/qelmt/dynamictext.rs
+++ b/src/qelmt/dynamictext.rs
@@ -169,6 +169,8 @@ impl ScaleEntity for DynamicText {
         self.y *= fact_y;
         self.align_x *= fact_x;
         self.align_y *= fact_y;
+        self.text_width *= fact_x.abs();
+        self.text_height *= fact_y.abs();
         self.font.scale(fact_y);
     }
 
@@ -177,8 +179,7 @@ impl ScaleEntity for DynamicText {
     }
 
     fn right_bound(&self) -> f64 {
-        //todo!()
-        1.0
+        self.x + self.text_width
     }
 
     fn top_bound(&self) -> f64 {
@@ -186,8 +187,7 @@ impl ScaleEntity for DynamicText {
     }
 
     fn bot_bound(&self) -> f64 {
-        //todo!()
-        1.0
+        self.y - self.text_height
     }
 }
 
@@ -358,8 +358,14 @@ impl<'a> DTextBuilder<'a> {
         dbg!(&y);
         dbg!(&self.text);*/
         let value = super::strip_mtext_control_sequences(&value);
-         // 将 DXF 中读取到的 text_height 放大 2 倍（用户要求）
+        // 将 DXF 中读取到的 text_height 放大 2 倍（用户要求）
         let text_height = text_height * 2.0;
+        let text_width = if reference_rectangle_width > 0.0 {
+            reference_rectangle_width
+        } else {
+            estimate_text_width(&value, text_height)
+        };
+
         DynamicText {
             //x: x - (calc_width as f64/2.0),
             x,
@@ -387,7 +393,7 @@ impl<'a> DTextBuilder<'a> {
             text_from: "UserText".into(),
             frame: false,
             text_height,
-            text_width: -1.0, // for now, until I figure out what this should be
+            text_width,
             color: self.color.unwrap_or(HexColor::BLACK),
 
             text: value,
@@ -482,3 +488,21 @@ pub fn adjust_mtext_coordinates(
     
     (adjusted_x, adjusted_y)
 }
+
+fn estimate_text_width(text: &str, line_height: f64) -> f64 {
+    let effective_height = line_height.abs();
+    if effective_height == 0.0 {
+        return 0.0;
+    }
+
+    let max_graphemes = text
+        .lines()
+        .map(|line| line.graphemes(true).count() as f64)
+        .fold(0.0, f64::max);
+
+    if max_graphemes > 0.0 {
+        max_graphemes * effective_height * 0.75
+    } else {
+        effective_height
+    }
+}