cad-editor/src/modules/annotate/aligned_dim.rs

// DIMALIGNED command — aligned dimension (measures true distance between two points).

use acadrust::entities::{Dimension, DimensionAligned};
use acadrust::types::Vector3;
use acadrust::EntityType;
use glam::{DVec3, Vec3};

use crate::command::{CadCommand, CmdResult};
use crate::modules::{IconKind, ModuleEvent, ToolDef};
use crate::scene::model::wire_model::WireModel;

pub const ICON: IconKind = IconKind::Svg(include_bytes!("../../../assets/icons/dim_aligned.svg"));

pub fn tool() -> ToolDef {
    ToolDef {
        id: "DIMALIGNED",
        label: "Aligned",
        icon: ICON,
        event: ModuleEvent::Command("DIMALIGNED".to_string()),
    }
}

enum Step {
    First,
    Second(Vec3),
    DimLine { p1: Vec3, p2: Vec3 },
}

pub struct AlignedDimensionCommand {
    step: Step,
}

impl AlignedDimensionCommand {
    pub fn new() -> Self {
        Self { step: Step::First }
    }
}

impl CadCommand for AlignedDimensionCommand {
    fn name(&self) -> &'static str {
        "DIMALIGNED"
    }

    fn prompt(&self) -> String {
        match self.step {
            Step::First => "DIMALIGNED  Specify first extension line origin:".into(),
            Step::Second(_) => "DIMALIGNED  Specify second extension line origin:".into(),
            Step::DimLine { .. } => "DIMALIGNED  Specify dimension line location:".into(),
        }
    }

    fn on_point(&mut self, pt: DVec3) -> CmdResult { let pt = pt.as_vec3();
        match self.step {
            Step::First => {
                self.step = Step::Second(pt);
                CmdResult::NeedPoint
            }
            Step::Second(p1) => {
                self.step = Step::DimLine { p1, p2: pt };
                CmdResult::NeedPoint
            }
            Step::DimLine { p1, p2 } => {
                let mut dim = DimensionAligned::new(v3(p1), v3(p2));
                // The dimension line runs through the cursor: store it as the
                // definition point and let the renderer project it onto the
                // line perpendicular (same as the preview and DIMLINEAR).
                //
                // The old path called `set_offset` with the straight-line
                // p2→cursor *distance*, which `set_offset` then re-applies along
                // the line perpendicular — placing the line at the wrong
                // perpendicular distance and always on the +perp side, so it
                // never matched the preview the user was dragging. (#150)
                dim.definition_point = v3(pt);
                dim.base.definition_point = v3(pt);
                let (d1, d2) = dim_line_endpoints(p1, p2, pt);
                dim.base.text_middle_point = v3((d1 + d2) * 0.5);
                dim.base.insertion_point = dim.base.text_middle_point;
                dim.base.actual_measurement = dim.measurement();
                CmdResult::CommitAndExit(EntityType::Dimension(Dimension::Aligned(dim)))
            }
        }
    }

    fn on_enter(&mut self) -> CmdResult {
        CmdResult::Cancel
    }

    fn on_mouse_move(&mut self, pt: DVec3) -> Option<WireModel> { let pt = pt.as_vec3();
        let (p1, p2) = match self.step {
            Step::First => return None,
            Step::Second(p1) => (p1, pt),
            Step::DimLine { p1, p2 } => {
                return Some(preview_aligned(p1, p2, pt));
            }
        };
        Some(WireModel {
            name: "dimaligned_preview".into(),
            points: vec![[p1.x, p1.y, p1.z], [p2.x, p2.y, p2.z]],
            points_low: Vec::new(),
            color: WireModel::CYAN,
            selected: false,
            pattern_length: 0.0,
            pattern: [0.0; 8],
            line_weight_px: 1.0,
            snap_pts: vec![],
            tangent_geoms: vec![],
            aci: 0,
            key_vertices: vec![],
            aabb: WireModel::UNBOUNDED_AABB,
            plinegen: true,
            vp_scissor: None,
            fill_tris: vec![],
            fill_tris_low: Vec::new(),
        })
    }
}

fn v3(p: Vec3) -> Vector3 {
    Vector3::new(p.x as f64, p.y as f64, p.z as f64)
}

/// Dimension-line endpoints: the baseline `p1`–`p2` shifted to pass through
/// the cursor's perpendicular projection. Uses the XY-plane perpendicular so
/// it matches the committed entity's renderer (and DIMLINEAR). The old
/// preview used an XZ-plane perpendicular, drawing the offset in the wrong
/// spatial direction. (#150)
fn dim_line_endpoints(p1: Vec3, p2: Vec3, dim_pt: Vec3) -> (Vec3, Vec3) {
    let axis = (p2 - p1).normalize_or_zero();
    let perp = Vec3::new(-axis.y, axis.x, 0.0);
    let offset = (dim_pt - p1).dot(perp);
    (p1 + perp * offset, p2 + perp * offset)
}

fn preview_aligned(p1: Vec3, p2: Vec3, dim_pt: Vec3) -> WireModel {
    // Show ext lines + dim line.
    let (d1, d2) = dim_line_endpoints(p1, p2, dim_pt);
    WireModel {
        name: "dimaligned_preview".into(),
        points: vec![
            [p1.x, p1.y, p1.z],
            [d1.x, d1.y, d1.z],
            [f32::NAN, 0.0, 0.0],
            [p2.x, p2.y, p2.z],
            [d2.x, d2.y, d2.z],
            [f32::NAN, 0.0, 0.0],
            [d1.x, d1.y, d1.z],
            [d2.x, d2.y, d2.z],
        ],
        points_low: Vec::new(),
        color: WireModel::CYAN,
        selected: false,
        pattern_length: 0.0,
        pattern: [0.0; 8],
        line_weight_px: 1.0,
        snap_pts: vec![],
        tangent_geoms: vec![],
        aci: 0,
        key_vertices: vec![],
        aabb: WireModel::UNBOUNDED_AABB,
        plinegen: true,
        vp_scissor: None,
        fill_tris: vec![],
        fill_tris_low: Vec::new(),
    }
}


// ── Autocomplete registry ─────────────────────────────────
inventory::submit!(crate::command::CommandRegistration { names: &["DAL", "DIMALIGNED"] });  // AlignedDimensionCommand