Fix graph of second 24 hours of data

[ryandesign]

Previously the second 24 hours of each graph column (landscape) or row (portrait) were just a repeat of the first 24 hours. Now the second 24 hours correctly represent the next day's data.

Fixes #12

Old	New

Summary by CodeRabbit

• Bug Fixes
  • Improved the rendering of color data in visualizations to ensure more accurate and visually consistent plots.

[ryandesign]

After merging this, please update the sample actograms shown in the readme using the corrected code.

[coderabbitai]

Walkthrough

The update modifies the define_pcolormesh_args method within the ProcessData class in src/webactogram/webactogram.py. The change alters how the color data array (zz) is constructed for plotting: instead of simply tiling the data, the method now vertically stacks the original array with a shifted and padded version of itself, introducing a one-column offset. This approach changes how the data is visualized, potentially addressing issues with duplicated or misaligned history in the plot. No changes were made to method signatures or public interfaces.

Changes

File(s)	Change Summary
src/webactogram/webactogram.py	Modified define_pcolormesh_args to change how the color data array (zz) is constructed, using vertical stacking and offsetting instead of tiling. No changes to public interfaces.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant ProcessData
    participant Plot

    User->>ProcessData: Call define_pcolormesh_args()
    ProcessData->>ProcessData: Construct zz by stacking and offsetting arrays
    ProcessData->>Plot: Provide x, y, zz for plotting
    Plot->>User: Display updated visualization

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Assessment against linked issues

Objective (Issue #)	Addressed	Explanation
Fix duplicated/doubled history in plot (#12)	✅

Poem

A hop and a stack, no more double-take,
The history’s now smooth, for clarity’s sake.
With arrays aligned and columns offset,
The actogram shines, its best version yet.
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between 2699eb7 and d9bf89e.

📒 Files selected for processing (1)

• src/webactogram/webactogram.py (1 hunks)

🔇 Additional comments (1)

src/webactogram/webactogram.py (1)

440-441: Fixed actogram double-plotting to correctly display the second 24 hours

The change correctly implements double-plotting for actograms. Previously, the code was simply duplicating the same 24 hours of data using np.tile, which displayed identical data in both halves of each row/column. The new implementation properly shows the second 24 hours as the data from the subsequent day by:

1. Taking the original data array
2. Creating a shifted version of it (padding on the right and removing the leftmost column)
3. Vertically stacking these two arrays

This fix resolves issue #12 where the second 24 hours were incorrectly displayed as duplicates of the first 24 hours.

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