新增获取动态字体宽度系数

src/qelmt/dynamictext.rs

@@ -30,6 +30,7 @@ pub struct DynamicText {
     frame: bool,
     text_height: f64,
     text_width: f64,
+    pub relative_x_scale_factor: f64,
     keep_visual_rotation: bool,
     color: HexColor,
     reference_rectangle_width: f64,
@@ -59,6 +60,7 @@ impl From<&DynamicText> for XMLElement {
         println!("文本:{}", txt.text);
         println!("对齐方式：{}, {}", txt.h_alignment, txt.v_alignment);
         println!("文本宽度: {}", txt.text_width);
+        println!("relative_x_scale_factor: {}", txt.relative_x_scale_factor);
         println!("文本高度：{}", pt_size);
         println!("初始左下角位置: x={}, y={}", txt.x, txt.y);
         println!("初始对齐位置: x={}, y={}", txt.align_x, txt.align_y);
@@ -132,6 +134,7 @@ impl From<&DynamicText> for XMLElement {
         dtxt_xml.add_attribute("frame", txt.frame);
         dtxt_xml.add_attribute("text_height", txt.text_height);
         dtxt_xml.add_attribute("text_width", txt.text_width);
+        dtxt_xml.add_attribute("relative_x_scale_factor", two_dec(txt.relative_x_scale_factor));
         dtxt_xml.add_attribute("color", txt.color.display_rgb());
         dtxt_xml.add_attribute("align_x", two_dec(align_x));
         dtxt_xml.add_attribute("align_y", two_dec(align_y));
@@ -239,7 +242,7 @@ impl<'a> DTextBuilder<'a> {
             reference_rectangle_width,
             align_x,
             align_y,
-
+            relative_x_scale_factor,
         ) = match self.text {
             TextEntity::Text(txt) => {
                 // let (x, y) = if txt.horizontal_text_justification == HorizontalTextJustification::Left && (txt.vertical_text_justification == VerticalTextJustification::Bottom || txt.vertical_text_justification == VerticalTextJustification::Baseline) {
@@ -259,7 +262,8 @@ impl<'a> DTextBuilder<'a> {
                     VAlignment::from_text_entity(txt.vertical_text_justification, false),
                     0.0, // as Placeholder: no "reference_rectangle_width" with Text!!!
                     txt.second_alignment_point.x,
-                    -txt.second_alignment_point.y
+                    -txt.second_alignment_point.y,
+                    txt.width_factor,
             )},
             TextEntity::MText(mtxt) => {
                 // 计算实际的旋转角度，优先使用x_axis_direction向量
@@ -300,6 +304,7 @@ impl<'a> DTextBuilder<'a> {
                 mtxt.reference_rectangle_width,
                 mtxt.insertion_point.x,
                 -mtxt.insertion_point.y,
+                1.0,
             )},
             TextEntity::Attrib(attrib) => {
                 // 根据DXF文本对齐规则，当水平对齐不是Left时，使用second_alignment_point
@@ -322,7 +327,8 @@ impl<'a> DTextBuilder<'a> {
                     VAlignment::from_text_entity(attrib.vertical_text_justification, true),
                     0.0, // as Placeholder: not need to check if Attrib has something similar
                     attrib.second_alignment_point.x,
-                    -attrib.second_alignment_point.y
+                    -attrib.second_alignment_point.y,
+                    attrib.width_factor,
                 )
             },
         };
@@ -358,8 +364,14 @@ 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, relative_x_scale_factor)
+        };
+
         DynamicText {
             //x: x - (calc_width as f64/2.0),
             x,
@@ -387,7 +399,8 @@ 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,
+            relative_x_scale_factor,
             color: self.color.unwrap_or(HexColor::BLACK),
 
             text: value,
@@ -482,3 +495,29 @@ pub fn adjust_mtext_coordinates(
     
     (adjusted_x, adjusted_y)
 }
+
+fn estimate_text_width(text: &str, line_height: f64, relative_x_scale_factor: f64) -> f64 {
+    let effective_height = line_height.abs();
+    if effective_height == 0.0 {
+        return 0.0;
+    }
+
+    let base_width = text
+        .lines()
+        .map(|line| line.graphemes(true).count() as f64)
+        .fold(0.0, f64::max);
+
+    let base_width = if base_width > 0.0 {
+        base_width * effective_height * 0.75
+    } else {
+        effective_height
+    };
+
+    let scale = if relative_x_scale_factor.abs() <= f64::EPSILON {
+        1.0
+    } else {
+        relative_x_scale_factor
+    };
+
+    base_width * scale
+}