Add dpi parameter to New-AbrDiagram and Icon size parameters to Add-HtmlNodeTable by tpcarman · Pull Request #27 · AsBuiltReport/AsBuiltReport.Diagram

tpcarman · 2026-06-16T08:21:14Z

Description

Adds two small enhancements to the diagram engine, both needed to support higher-quality, properly-sized Management Group hierarchy diagrams in a downstream report module (AsBuiltReport.Microsoft.Azure):

New-AbrDiagram: adds an optional -Dpi parameter (ValidateRange(72, 600)) that sets the Graphviz dpi graph attribute, controlling the raster output resolution for PNG/JPG formats. Previously this was fixed at Graphviz's default of 96 DPI with no way to increase it.
Add-HtmlNodeTable: adds optional -IconWidth/-IconHeight parameters for the regular (non-subgraph) icon TD in a node's HTML table. Previously this TD had no width/height/fixedsize attribute at all, so the icon's rendered size was derived solely from the source image's raw pixel dimensions, making on-page icon size unpredictable and hard to control. This mirrors the existing SubgraphIconWidth/SubgraphIconHeight pattern already used for the Subgraph-emulated icon path, just applied to the plain icon path.

Neither change alters default behaviour. Both parameters are optional and a no-op when omitted.

Related Issue

N/A. This is enhancement work identified while improving diagram quality in a consuming report module, not tied to a tracked issue.

Motivation and Context

A consuming report module (AsBuiltReport.Microsoft.Azure) renders a Management Group hierarchy diagram using Add-HtmlNodeTable and New-AbrDiagram. Two problems surfaced:

The diagram was rendered at a fixed 96 DPI with no way to increase sharpness for print/Word output.
The icon size in each node was effectively uncontrollable. Only the source PNG's native pixel count mattered, and even resizing the source file produced only marginal, unpredictable visual size changes (e.g. 40x40px to 50x50px source only grew the rendered icon by about 25 percent).

Both parameters give consumers explicit, predictable control over these two visual properties.

How Has This Been Tested?

Manual testing via direct module import and rendering (no automated Pester tests added, these are additive, optional parameters):

-Dpi: Rendered the same diagram at DPI 96, 150, 200, and 300 and confirmed the output PNG's pixel dimensions scaled proportionally (e.g. 96 to 467x479px, 300 to 1458x1496px, matching the 300/96 ratio).
-IconWidth/-IconHeight: Rendered a test node with and without the new parameters and measured the actual rendered icon's pixel footprint via row-content-bounding-box analysis. Default (no params): icon block about 46px tall. With -IconWidth 60 -IconHeight 60: icon block about 62px tall, confirming the fixed-size cell scales the image as expected, independent of the source file's native pixel dimensions.
Verified both Add-HtmlNodeTable.ps1 and New-AbrDiagram.ps1 parse cleanly with no syntax errors.
Confirmed existing call sites (without the new parameters) render unchanged, preserving backward compatibility.

Screenshots (if appropriate):

Types of changes

Bug fix (non-breaking change which fixes an issue)
New feature (non-breaking change which adds functionality)
Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

My code follows the code style of this project.
My change requires a change to the documentation.
I have updated the documentation accordingly.
I have read the CONTRIBUTING document.

Expose the Graphviz dpi graph attribute so raster (PNG/JPG) output resolution can be set explicitly instead of being fixed at the Graphviz default of 96. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

The icon <TD> for a regular (non-subgraph) node had no width/height/fixedsize attribute, so its rendered size was derived purely from the source image's pixel count interpreted as Graphviz points. This made resizing the source PNG an unreliable way to control on-page icon size. Mirrors the existing SubgraphIconWidth/SubgraphIconHeight pattern.

github-actions · 2026-06-16T08:21:55Z

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rebelinux

LGTM

tpcarman and others added 2 commits June 16, 2026 16:00

Add -Dpi parameter to New-AbrDiagram

04cbc8b

Expose the Graphviz dpi graph attribute so raster (PNG/JPG) output resolution can be set explicitly instead of being fixed at the Graphviz default of 96. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tpcarman requested a review from rebelinux June 16, 2026 08:21

tpcarman added the change request New feature or request label Jun 16, 2026

github-advanced-security AI found potential problems Jun 16, 2026

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rebelinux approved these changes Jun 16, 2026

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rebelinux merged commit 5e0e9f5 into dev Jun 16, 2026
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Add dpi parameter to New-AbrDiagram and Icon size parameters to Add-HtmlNodeTable#27

Add dpi parameter to New-AbrDiagram and Icon size parameters to Add-HtmlNodeTable#27
rebelinux merged 2 commits into
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feature/diagram-dpi

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tpcarman commented Jun 16, 2026

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