fix(styles): apply active creation defaults

Resolve style properties before editors and previews open.
Use absolute annotation multipliers for style-driven objects.

Refs #401

Refs #431

src/scene/creation_style.rs

@@ -0,0 +1,258 @@
+use acadrust::objects::ObjectType;
+use acadrust::tables::{DimStyle, TextStyle};
+use acadrust::{CadDocument, EntityType, Handle};
+
+#[derive(Debug, Clone)]
+pub struct TextCreationDefaults {
+    pub style_name: String,
+    pub height: f64,
+    pub width_factor: f64,
+    pub oblique_angle: f64,
+}
+
+#[derive(Debug, Clone)]
+pub struct DimensionCreationDefaults {
+    pub style_name: String,
+    pub style_handle: Handle,
+    pub text_style_name: String,
+    pub text_height: f64,
+    pub gap: f64,
+    pub arrow_size: f64,
+    pub scale: f64,
+    pub annotative: bool,
+}
+
+fn named_text_style(doc: &CadDocument, name: &str) -> Option<TextStyle> {
+    doc.text_styles
+        .iter()
+        .find(|style| style.name.eq_ignore_ascii_case(name))
+        .or_else(|| {
+            doc.text_styles
+                .iter()
+                .find(|style| style.name.eq_ignore_ascii_case("Standard"))
+        })
+        .cloned()
+}
+
+fn named_dim_style(doc: &CadDocument, name: &str) -> Option<DimStyle> {
+    doc.dim_styles
+        .iter()
+        .find(|style| style.name.eq_ignore_ascii_case(name))
+        .or_else(|| {
+            doc.dim_styles
+                .iter()
+                .find(|style| style.name.eq_ignore_ascii_case("Standard"))
+        })
+        .cloned()
+}
+
+pub fn current_text_defaults(doc: &CadDocument) -> TextCreationDefaults {
+    let requested = doc.header.current_text_style_name.trim();
+    let style = named_text_style(doc, requested);
+    let variable_height = if doc.header.text_height > 1.0e-9 {
+        doc.header.text_height
+    } else {
+        style
+            .as_ref()
+            .map(|style| style.last_height)
+            .filter(|height| *height > 1.0e-9)
+            .unwrap_or(2.5)
+    };
+    TextCreationDefaults {
+        style_name: style
+            .as_ref()
+            .map(|style| style.name.clone())
+            .filter(|name| !name.trim().is_empty())
+            .unwrap_or_else(|| "Standard".to_string()),
+        height: style
+            .as_ref()
+            .map(|style| style.height)
+            .filter(|height| *height > 1.0e-9)
+            .unwrap_or(variable_height),
+        width_factor: style.as_ref().map_or(1.0, |style| style.width_factor),
+        oblique_angle: style.as_ref().map_or(0.0, |style| style.oblique_angle),
+    }
+}
+
+pub fn current_dimension_defaults(doc: &CadDocument) -> DimensionCreationDefaults {
+    let requested = doc.header.current_dimstyle_name.trim();
+    let style = named_dim_style(doc, requested);
+    DimensionCreationDefaults {
+        style_name: style
+            .as_ref()
+            .map(|style| style.name.clone())
+            .filter(|name| !name.trim().is_empty())
+            .unwrap_or_else(|| "Standard".to_string()),
+        style_handle: style.as_ref().map_or(Handle::NULL, |style| style.handle),
+        text_style_name: style
+            .as_ref()
+            .map(|style| style.dimtxsty.clone())
+            .filter(|name| !name.trim().is_empty())
+            .unwrap_or_else(|| current_text_defaults(doc).style_name),
+        text_height: style.as_ref().map_or(2.5, |style| style.dimtxt),
+        gap: style.as_ref().map_or(0.625, |style| style.dimgap),
+        arrow_size: style.as_ref().map_or(2.5, |style| style.dimasz),
+        scale: style.as_ref().map_or(1.0, |style| {
+            if style.annotative {
+                1.0
+            } else if style.dimscale > 1.0e-9 {
+                style.dimscale
+            } else {
+                1.0
+            }
+        }),
+        annotative: style.as_ref().is_some_and(|style| style.annotative),
+    }
+}
+
+fn entity_uses_default_style(name: &str) -> bool {
+    name.trim().is_empty() || name.eq_ignore_ascii_case("Standard")
+}
+
+fn apply_text_defaults(doc: &CadDocument, entity: &mut EntityType) {
+    let active = current_text_defaults(doc);
+    let style_name = match entity {
+        EntityType::Text(text) => &mut text.style,
+        EntityType::MText(text) => &mut text.style,
+        EntityType::AttributeEntity(attribute) => &mut attribute.text_style,
+        EntityType::AttributeDefinition(attribute) => &mut attribute.text_style,
+        _ => return,
+    };
+    if style_name.trim().is_empty() {
+        style_name.clone_from(&active.style_name);
+    }
+    let resolved = named_text_style(doc, style_name)
+        .unwrap_or_else(|| TextStyle::new(style_name.clone()));
+    match entity {
+        EntityType::Text(text) => {
+            if resolved.height > 1.0e-9 {
+                text.height = resolved.height;
+            }
+            if (text.width_factor - 1.0).abs() <= 1.0e-9 {
+                text.width_factor = resolved.width_factor;
+            }
+            if text.oblique_angle.abs() <= 1.0e-9 {
+                text.oblique_angle = resolved.oblique_angle;
+            }
+            if text.generation_flags == 0 {
+                text.generation_flags = (if resolved.flags.backward { 2 } else { 0 })
+                    | (if resolved.flags.upside_down { 4 } else { 0 });
+            }
+        }
+        EntityType::MText(text) => {
+            if resolved.height > 1.0e-9 {
+                text.height = resolved.height;
+            }
+        }
+        EntityType::AttributeEntity(attribute) => {
+            if resolved.height > 1.0e-9 {
+                attribute.height = resolved.height;
+            }
+            if (attribute.width_factor - 1.0).abs() <= 1.0e-9 {
+                attribute.width_factor = resolved.width_factor;
+            }
+            if attribute.oblique_angle.abs() <= 1.0e-9 {
+                attribute.oblique_angle = resolved.oblique_angle;
+            }
+            if attribute.text_generation_flags == 0 {
+                attribute.text_generation_flags =
+                    (if resolved.flags.backward { 2 } else { 0 })
+                        | (if resolved.flags.upside_down { 4 } else { 0 });
+            }
+        }
+        EntityType::AttributeDefinition(attribute) => {
+            if resolved.height > 1.0e-9 {
+                attribute.height = resolved.height;
+            }
+            if (attribute.width_factor - 1.0).abs() <= 1.0e-9 {
+                attribute.width_factor = resolved.width_factor;
+            }
+            if attribute.oblique_angle.abs() <= 1.0e-9 {
+                attribute.oblique_angle = resolved.oblique_angle;
+            }
+            if attribute.text_generation_flags == 0 {
+                attribute.text_generation_flags =
+                    (if resolved.flags.backward { 2 } else { 0 })
+                        | (if resolved.flags.upside_down { 4 } else { 0 });
+            }
+        }
+        _ => {}
+    }
+}
+
+fn apply_dimension_defaults(doc: &CadDocument, entity: &mut EntityType) {
+    let active = current_dimension_defaults(doc);
+    match entity {
+        EntityType::Dimension(dimension) => {
+            if entity_uses_default_style(&dimension.base().style_name) {
+                dimension.base_mut().style_name.clone_from(&active.style_name);
+            }
+        }
+        EntityType::Leader(leader) => {
+            if entity_uses_default_style(&leader.dimension_style) {
+                leader.dimension_style.clone_from(&active.style_name);
+                leader.text_height = active.text_height;
+                leader.dimension_gap = active.gap;
+                leader.arrow_size = active.arrow_size;
+            }
+        }
+        EntityType::Tolerance(tolerance) => {
+            if entity_uses_default_style(&tolerance.dimension_style_name) {
+                tolerance.dimension_style_name.clone_from(&active.style_name);
+                tolerance.dimension_style_handle = (!active.style_handle.is_null())
+                    .then_some(active.style_handle);
+                tolerance.text_height = active.text_height;
+                tolerance.dimension_gap = active.gap;
+            }
+        }
+        _ => {}
+    }
+}
+
+fn apply_object_defaults(doc: &CadDocument, entity: &mut EntityType) {
+    match entity {
+        EntityType::MultiLeader(leader) if leader.style_handle.is_none() => {
+            let name = doc.header.current_mleader_style_name.trim();
+            if let Some(style) = doc.objects.iter().find_map(|(handle, object)| match object {
+                ObjectType::MultiLeaderStyle(style) if style.name.eq_ignore_ascii_case(name) => {
+                    let mut style = style.clone();
+                    style.handle = *handle;
+                    Some(style)
+                }
+                _ => None,
+            }) {
+                crate::scene::annotative::apply_mleader_style(leader, &style);
+            }
+        }
+        EntityType::Table(table) if table.table_style_handle.is_none() => {
+            let name = doc.header.current_table_style_name.trim();
+            table.table_style_handle = doc.objects.iter().find_map(|(handle, object)| match object {
+                ObjectType::TableStyle(style) if style.name.eq_ignore_ascii_case(name) => {
+                    Some(*handle)
+                }
+                _ => None,
+            });
+        }
+        EntityType::MLine(mline) if mline.style_handle.is_none() => {
+            let name = doc.header.multiline_style.trim();
+            if let Some((handle, style_name)) =
+                doc.objects.iter().find_map(|(handle, object)| match object {
+                    ObjectType::MLineStyle(style) if style.name.eq_ignore_ascii_case(name) => {
+                        Some((*handle, style.name.clone()))
+                    }
+                    _ => None,
+                })
+            {
+                mline.style_handle = Some(handle);
+                mline.style_name = style_name;
+            }
+        }
+        _ => {}
+    }
+}
+
+pub fn apply_current_creation_styles(doc: &CadDocument, entity: &mut EntityType) {
+    apply_text_defaults(doc, entity);
+    apply_dimension_defaults(doc, entity);
+    apply_object_defaults(doc, entity);
+}