The grid was drawn whenever its `visible` flag was set or a perspective
tool was active, and choosing the Perspective Grid tool (Shift+P) didn't set
the flag. So with the tool chosen, View > Perspective Grid > Hide Grid
(perspective.grid.show) turned the hidden flag on instead of off and the
grid stayed on screen however it was toggled.
Choosing a perspective tool now shows the grid (sets `visible`, view state,
no undo step), and the grid, its widget and the Perspective Grid tool's
handles are drawn only while it is visible. Hide Grid hides it with the
tool still chosen; choosing the tool again shows it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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>
