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Wiresheet zoom, from the View menu, the toolbar and Ctrl+wheel

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A ladder of scales from 50% to 300%, stepped by Zoom In / Zoom Out / Zoom 100%,
by the two buttons beside the navigation arrows, and by Ctrl and the wheel,
which holds the point under the pointer still. A menu or keyboard zoom holds
the middle of the view instead, so it closes in on what is already being
looked at.

Painting and routing stay at 1:1, because that is where every metric is tuned:
box header and row heights, wire stubs, lane gaps, standoffs, knob radii. Zoom
scales the finished picture, so a zoomed sheet keeps the proportions of a 1:1
one and the router reaches the same decisions at every scale. Text comes along
because the three box fonts are resized once the boxes have been measured with
them.

redraw_links replaces the direct draw_links calls a drag or a drop makes: the
router reads box positions off the canvas, so the boxes go back to 1:1 for the
routing pass and the result is scaled again. Canvas coordinates carry the zoom,
which is why the drag, release and drop handlers now snap against
meta_scale * zoom -- a box dragged the same distance across the screen lands on
the same meta step at 50%, 100% and 200%.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
Arda
2026-09-04 23:03:35 +03:00
co-authored by Claude Opus 5
parent 0166be3454
commit 781138e3dc
4 changed files with 229 additions and 22 deletions
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README.md
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@@ -85,6 +85,9 @@ Undoing back to the depth of the last save clears the dirty tint rather than lea
| `Ctrl`/`Cmd` + `B` | Show or hide the tree/palette column |
| `Ctrl` + `W` | Tidy Layout: re-flow the open sheet |
| `Alt` + `Left` / `Alt` + `Right` | Back and forward through the sheets opened this session |
| `Ctrl`/`Cmd` + `+` / `-` | Zoom the sheet in and out |
| `Ctrl`/`Cmd` + `0` | Zoom back to 100% |
| `Ctrl` + wheel | Zoom around the pointer |
Both `Command-` and `Control-` are bound for each, so the same build works on macOS and
Windows; menu accelerators render as `Cmd` or `Ctrl` per platform. Tidy Layout is the
@@ -96,6 +99,17 @@ exception, on `Control-` alone: `Cmd` + `W` closes the window on macOS.
it back at its configured width. ttk has no hide flag for a pane, so the column is dropped
from the paned window and re-inserted at the front.
**Zoom In**, **Zoom Out** and **Zoom 100%** step a ladder of scales, with the two zoom
buttons and the percentage sitting beside the navigation arrows in the toolbar. The sheet
is painted and routed at 1:1 -- box metrics, wire stubs, lane gaps, clearances and knob
radii are all tuned in those pixels -- and `apply_sheet_zoom` scales the finished picture,
so a zoomed sheet keeps exactly the proportions of a 1:1 one and the router makes the same
decisions at every scale. Text scales because the three box fonts are resized after the
boxes were measured with them. `redraw_links()` is what a drag or a drop calls: it puts
the boxes back to 1:1 for the routing pass and scales the result again, since the router
reads box positions straight off the canvas. Canvas coordinates therefore carry the zoom,
which is why the drag, release and drop handlers snap against `meta_scale * zoom`.
**Back** and **Forward** walk the sheets opened this session, mirrored by the two arrow
buttons in the toolbar. The history records the element whose children are painted -- the
same thing `app_state.current_sheet_parent` holds -- rather than a tree item id, because