Estimate Pan Positions on a Magnified Canvas — Free
A fixed canvas can require many viewport positions when magnified. Estimate non-overlapping coverage to expose navigation burden, not to claim a reader will follow a perfect scan path.
The proof surface
Contrast tools check colors and reflow tools adjust text. This examines two-dimensional canvas coverage when a reader must pan instead of reflowing content.
Why the flat version breaks
Dividing area by area
Partial edge tiles can require additional positions.
Using screen pixels at high zoom
The relevant unit is visible content pixels.
Calling coverage usability
Reaching every tile does not establish understanding.
How to work the viewport mosaic
Use the canvas dimensions, not the physical monitor resolution. If magnification changes the visible content area, measure that smaller area in the same coordinate system.
Enter the usable square width after controls and browser chrome. For a non-square viewport this instrument is intentionally conservative only if you use its shorter dimension.
The 1200 by 900 map needs three columns and three rows at 400 pixels. Multiply rounded column and row counts; dividing total area alone misses partial edge tiles.
Try the real content with magnification. Record lost context, overlap needed for orientation and controls obscuring content; all can make actual movement exceed this ideal tiling.
What the viewport mosaic replaces
| Question | Before | Visible working |
|---|---|---|
| Dividing area by area | Partial edge tiles can require additional positions. | Model a square viewport |
| Using screen pixels at high zoom | The relevant unit is visible content pixels. | Round each direction separately |
| Calling coverage usability | Reaching every tile does not establish understanding. | Test navigation and orientation |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Ideal geometric coverage, not a usability score or an accessibility standard. It excludes overlap, orientation aids and actual movement paths.
Data note: Everything runs in this browser tab on the viewport mosaic: your canvas | content width pixels | content height pixels stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a scored comparison matrix
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the viewport mosaic reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The viewport mosaic reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the estimate pan positions on a magnified canvas companionBoundary
Ideal geometric coverage, not a usability score or an accessibility standard. It excludes overlap, orientation aids and actual movement paths.
What this is built on
- Method: The 1200 by 900 map needs three columns and three rows at 400 pixels. Multiply rounded column and row counts; dividing total area alone misses partial edge tiles.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-27, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Before: Partial edge tiles can require additional positions. After: the viewport mosaic shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this viewport mosaic, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a viewport mosaic. Return plain rows only: canvas | content width pixels | content height pixels. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: canvas | content width pixels | content height pixels. No AI response is executed as code.