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//! Section symbol entity (`AcDbSectionSymbol`, DXF class "SECTIONLINE").
//!
//! The section "A-A" cut mark drawn on a Model-Documentation base view. Its
//! `AcDbViewSymbol` base, complete repeated point records, and object references
//! are decoded and encoded as native fields.
use super::{Entity, EntityCommon};
use crate::types::{
BoundingBox3D, Color, Handle, LineWeight, Transform, Transparency, Vector3,
};
/// One repeated point record in an `AcDbSectionSymbol`.
///
/// The field order and DXF codes are verified against ODA exports of native
/// R2013/R2018 Model Documentation entities: point (10/20/30), bulge (40),
/// label (1), label offset (11/21/31), and the trailing byte (280).
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct SectionSymbolPoint {
/// Section-line vertex.
pub point: Vector3,
/// Bulge at this vertex.
pub bulge: f64,
/// Label attached to this vertex.
pub label: String,
/// Label offset from the vertex.
pub label_offset: Vector3,
/// Verified trailing group-280 byte; its public semantic name is unknown.
pub raw_flag_280: u8,
}
impl SectionSymbolPoint {
/// Create an empty point record.
pub fn new() -> Self {
Self {
point: Vector3::ZERO,
bulge: 0.0,
label: String::new(),
label_offset: Vector3::ZERO,
raw_flag_280: 0,
}
}
}
impl Default for SectionSymbolPoint {
fn default() -> Self {
Self::new()
}
}
/// A Model-Documentation section mark (`AcDbSectionSymbol`).
///
/// [`points`](Self::points) is the canonical serialized geometry. `end_*`,
/// `tick_*`, and `label` remain as compatibility projections for renderers
/// written before the complete point schema was known; they are not separate
/// fields on disk.
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct SectionSymbol {
/// Common entity data (handle, layer, color, …).
pub common: EntityCommon,
/// `AcDbViewSymbol` version (first group 70 in that subclass).
pub view_symbol_version: i16,
/// The symbol's `AcDbSectionViewStyle` handle (group 340).
pub style_handle: Handle,
/// `AcDbViewSymbol` scale (group 40).
pub symbol_scale: f64,
/// Parent `AcDbViewRep` handle (group 330).
pub view_rep_handle: Handle,
/// Verified second group 70 in `AcDbViewSymbol`; public semantics unknown.
pub raw_view_symbol_70: i16,
/// `AcDbSectionSymbol` version (first group 70 in that subclass).
pub version: i16,
/// Verified first group 90; equals the point-record count in the corpus.
pub raw_point_count_90: i32,
/// Verified second group 90 after the point count; public semantics unknown.
pub raw_flags_90: i32,
/// Verified third group 90; equals the point count in the available corpus.
pub raw_point_record_count: i32,
/// Complete repeated section-point records.
pub points: Vec<SectionSymbolPoint>,
/// First cut-line endpoint (paper-space X, Y).
///
/// Compatibility projection of the first item in [`points`](Self::points).
pub end_a: [f64; 2],
/// Second cut-line endpoint (paper-space X, Y).
///
/// Compatibility projection of the last item in [`points`](Self::points).
pub end_b: [f64; 2],
/// Legacy renderer value for the first label-offset Y.
///
/// Compatibility projection of the first point's label-offset Y.
pub tick_a: f64,
/// Legacy renderer value for the last label-offset Y.
///
/// Compatibility projection of the last point's label-offset Y.
pub tick_b: f64,
/// Section identifier text (drawn at each end).
///
/// Compatibility projection of the first non-empty point label.
pub label: String,
}
impl SectionSymbol {
/// Create an empty section symbol.
pub fn new() -> Self {
SectionSymbol {
common: EntityCommon::new(),
view_symbol_version: 0,
style_handle: Handle::NULL,
symbol_scale: 1.0,
view_rep_handle: Handle::NULL,
raw_view_symbol_70: 0,
version: 0,
raw_point_count_90: 0,
raw_flags_90: 0,
raw_point_record_count: 0,
points: Vec::new(),
end_a: [0.0; 2],
end_b: [0.0; 2],
tick_a: 0.0,
tick_b: 0.0,
label: String::new(),
}
}
/// Refresh the compatibility display fields from the complete point list.
pub fn sync_display_fields(&mut self) {
let Some(first) = self.points.first() else {
return;
};
let last = self.points.last().unwrap_or(first);
self.end_a = [first.point.x, first.point.y];
self.end_b = [last.point.x, last.point.y];
self.tick_a = first.label_offset.y;
self.tick_b = last.label_offset.y;
self.label = self.points
.iter()
.find_map(|point| {
(!point.label.is_empty()).then(|| point.label.clone())
})
.unwrap_or_default();
}
}
impl Default for SectionSymbol {
fn default() -> Self {
Self::new()
}
}
impl Entity for SectionSymbol {
fn handle(&self) -> Handle {
self.common.handle
}
fn set_handle(&mut self, handle: Handle) {
self.common.handle = handle;
}
fn layer(&self) -> &str {
&self.common.layer
}
fn set_layer(&mut self, layer: String) {
self.common.layer = layer;
}
fn color(&self) -> Color {
self.common.color
}
fn set_color(&mut self, color: Color) {
self.common.color = color;
}
fn line_weight(&self) -> LineWeight {
self.common.line_weight
}
fn set_line_weight(&mut self, weight: LineWeight) {
self.common.line_weight = weight;
}
fn transparency(&self) -> Transparency {
self.common.transparency
}
fn set_transparency(&mut self, transparency: Transparency) {
self.common.transparency = transparency;
}
fn is_invisible(&self) -> bool {
self.common.invisible
}
fn set_invisible(&mut self, invisible: bool) {
self.common.invisible = invisible;
}
fn bounding_box(&self) -> BoundingBox3D {
let points = if self.points.is_empty() {
vec![
Vector3::new(self.end_a[0], self.end_a[1], 0.0),
Vector3::new(self.end_b[0], self.end_b[1], 0.0),
]
} else {
self.points.iter().map(|point| point.point).collect()
};
BoundingBox3D::from_points(&points)
.unwrap_or_else(|| BoundingBox3D::from_point(Vector3::ZERO))
}
fn translate(&mut self, offset: Vector3) {
for point in &mut self.points {
point.point = point.point + offset;
}
self.end_a[0] += offset.x;
self.end_a[1] += offset.y;
self.end_b[0] += offset.x;
self.end_b[1] += offset.y;
}
fn entity_type(&self) -> &'static str {
"SECTIONLINE"
}
fn apply_transform(&mut self, transform: &Transform) {
for point in &mut self.points {
let original = point.point;
let transformed = transform.apply(original);
let offset_end = transform.apply(original + point.label_offset);
point.point = transformed;
point.label_offset = offset_end - transformed;
}
let end_a =
transform.apply(Vector3::new(self.end_a[0], self.end_a[1], 0.0));
let end_b =
transform.apply(Vector3::new(self.end_b[0], self.end_b[1], 0.0));
self.end_a = [end_a.x, end_a.y];
self.end_b = [end_b.x, end_b.y];
}
}
/// Display-relevant fields of an `AcDbSectionViewStyle` (DXF class
/// "ACDBSECTIONVIEWSTYLE"), the named style that controls how a section mark
/// is drawn. These are the fields the editor needs to render the mark.
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct SectionViewStyle {
/// Whether direction arrowheads are drawn (style `flags` bit 0x02).
pub show_arrows: bool,
/// Whether the full cutting-plane line is drawn through the view (`flags`
/// bit 0x08). Off = the familiar "broken" section line: only the end
/// segments are drawn.
pub show_plane_line: bool,
/// Whether the end (and bend) line segments are drawn (`flags` bit 0x20).
pub show_end_lines: bool,
/// Arrowhead size (`arrow_symbol_size`).
pub arrow_size: f64,
/// How far the arrow extends past the cut line (`arrow_symbol_extension_length`).
pub arrow_extension: f64,
/// Section identifier ("A") text height (`identifier_height`).
pub label_height: f64,
/// Gap between the cut line and the identifier text (`identifier_offset`).
pub label_offset: f64,
/// Identifier placement enum (`identifier_position`), raw value.
pub label_position: i32,
/// Arrow placement enum (`arrow_position`), raw value.
pub arrow_position: i32,
/// End-segment length (`end_line_length`) — with the overshoot this equals
/// the symbol's per-end tick.
pub end_line_length: f64,
/// Extension of the end segment beyond the arrow anchor (`end_line_overshoot`).
pub end_line_overshoot: f64,
/// Arrowhead block-record handles for the start / end of the section line
/// (`arrow_start_symbol` / `arrow_end_symbol`). `0` (null) selects the
/// built-in default arrow — the same ClosedFilled block dimensions and
/// leaders default to.
pub arrow_start_handle: u64,
/// See [`arrow_start_handle`](Self::arrow_start_handle).
pub arrow_end_handle: u64,
/// True when both arrow symbol handles are null, i.e. the built-in default
/// (solid/filled) arrowhead is used rather than a custom arrow block.
pub arrow_is_default: bool,
}