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feat: Grid snap adaptive spacing + Polar tracking improvements

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Grid snap (F9):
  • snap spacing now tracks the visible grid zoom level — computed via
    compute_grid_step() (same adaptive pow-of-5 logic as draw_grid),
    updated on every ViewportMove so zooming in/out keeps snap aligned
    with the grid lines on screen

Polar tracking (F10):
  • configurable angle increment stored in polar_increment_deg (default 45°)
  • right-click the POLAR pill to cycle through 15 → 30 → 45 → 90°
  • pill label shows current angle ("POLAR 45°")
  • visual guide line: while drawing with polar on, a dashed cyan line is
    drawn from last_point along the snapped direction across the viewport
  • SetPolarAngle message + handler; all polar_constrain() calls use the
    stored increment instead of the hardcoded 45°

ROADMAP updated: Grid snap and Polar tracking marked ✅.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-04-07 19:30:25 +03:00
commit 4c1c13cab6
6 changed files with 165 additions and 21 deletions
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9
src/app/mod.rs
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@ -43,8 +43,10 @@ pub(super) struct H7CAD {
pre_cmd_tangent: Option<bool>,
/// Orthogonal drawing constraint (F8): constrains picks to 0°/90°/180°/270°.
ortho_mode: bool,
/// Polar tracking (F10): constrains picks to 45° angle increments.
/// Polar tracking (F10): constrains picks to configurable angle increments.
polar_mode: bool,
/// Polar tracking angle increment in degrees (15 / 30 / 45 / 90).
polar_increment_deg: f32,
/// Show grid lines in the viewport (F7).
show_grid: bool,
/// Show the UCS icon in the bottom-left corner of model space (UCSICON).
@ -224,8 +226,10 @@ pub enum Message {
ToggleGrid,
/// Toggle orthogonal drawing constraint — F8 / ORTHO status-bar button.
ToggleOrtho,
/// Toggle polar-angle constraint (45° increments) — F10 / POLAR status-bar button.
/// Toggle polar-angle constraint — F10 / POLAR status-bar button.
TogglePolar,
/// Set polar tracking angle increment (right-click POLAR button).
SetPolarAngle(f32),
/// Toggle an individual snap mode (from popup row click).
ToggleSnap(crate::snap::SnapType),
/// Open / close the OSNAP popup (▾ arrow click).
@ -429,6 +433,7 @@ impl H7CAD {
pre_cmd_tangent: None,
ortho_mode: false,
polar_mode: false,
polar_increment_deg: 45.0,
show_grid: false,
show_ucs_icon: true,
last_point: None,