The Perspective Grid tool's left and right ground-level points move the whole
grid; the left and right extents are separate (extentRight; Alt drags both,
Shift goes by whole cells); a cell size widget sits up the line where the planes
meet; Shift keeps a vanishing point on the horizon and the ground points and
origin on one axis. The Plane Switching Widget stays put in a corner of the
document window (ViewInfo/ToolContext carry the window as a ScreenFrame), takes
its clicks with any tool while the grid shows (the Perspective Selection tool
too while it's hidden), and 1-4 pick the left, horizontal, right and no plane.
Double-clicking the Perspective Grid tool opens Perspective Grid Options
(show the widget, its corner; perspective.widget.options, kept with the
preferences).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
View > Perspective Grid gains Show/Hide Rulers, Snap to Grid (on by default),
Lock/Unlock Grid and Lock Station Point, with flipping labels and checkmarks (and
Show/Hide Grid's label). Lock Grid stops the grid widgets from dragging; Lock
Station Point swings the other vanishing point around the station point; Snap to
Grid lands drawn corners and moved edges on gridlines within a quarter cell
(perspective.draw/move take snap?); Show Rulers draws a ruler up the true height
line in the grid's units. Gridlines draw in the Define Grid colours and opacity.
New commands perspective.grid.lock/lockStation/snap/rulers (view state).
Existing tests that measure exact perspective moves (two in tests_distort.rs,
the persp_session helper of tests_persp_select.rs) turn snapping off first (it is on by
default and would move their exact corners onto gridlines).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
View > Perspective Grid > One/Two/Three Point Perspective list the built-in views
([1P/2P/3P-Normal View], plus Low and High views generated in code) and the saved
presets of each type; Save Grid as Preset... and Define Grid's Preset menu and Save
Preset... save the fields. Edit > Perspective Grid Presets... (previously a
mislabelled reset to the two-point grid) manages them: New, Edit, Delete, Import,
Export (.vcperspective), stored with the preferences. New commands
perspective.presets.list/save/delete/export/import; perspective.grid.preset takes
a preset name. Preset import is fuzzed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
View > Perspective Grid > Define Grid... opens a dedicated `perspectiveGrid` dialog
(ui.perspectiveGridDialog) prefilled from the current grid instead of a generic
form with fixed defaults that forced kind 2. The grid model gains (append-only)
name, viewing angle (the station point), units, scale, plane colours and opacity;
grids with a viewing angle foreshorten each axis as a true camera. New commands:
perspective.grid.get (read-only) and perspective.grid.define (one undo step,
only changed fields apply).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
