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simplify comments

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This commit is contained in:
Reece 2025-11-14 20:43:44 +00:00
parent 568cda1288
commit 4093ded628
1 changed files with 3 additions and 18 deletions
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21
frontend/src/core/utils/viewerZoom.ts
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@ -47,30 +47,15 @@ export function determineAutoZoom({
return { type: 'fallback', zoom: Math.min(fitWidthZoom, fallbackZoom) };
}
// Landscape pages need 100% visibility, portrait need 80%
// Landscape pages need 100% visibility, portrait need the specified threshold
const isLandscape = aspectRatio < 1;
const targetVisibility = isLandscape ? 100 : visibilityThreshold;
// Step 1: Calculate what zoom level shows targetVisibility% (80%) of page height
//
// At fitWidth, page dimensions are:
// pageHeightAtFitWidth = (viewportWidth / pagesPerSpread) * aspectRatio
//
// For 80% of page to be visible:
// viewportHeight / pageHeightAtZoom = targetVisibility / 100
// viewportHeight / (pageHeightAtFitWidth * zoomRatio) = targetVisibility / 100
//
// Where zoomRatio = heightBasedZoom / fitWidthZoom
//
// Solving:
// heightBasedZoom = fitWidthZoom * viewportHeight / (pageHeightAtFitWidth * targetVisibility / 100)
// heightBasedZoom = fitWidthZoom * (viewportHeight / pageHeightAtFitWidth) * (100 / targetVisibility)
// Calculate zoom level that shows targetVisibility% of page height
const pageHeightAtFitWidth = (viewportWidth / pagesPerSpread) * aspectRatio;
const heightBasedZoom = fitWidthZoom * (viewportHeight / pageHeightAtFitWidth) / (targetVisibility / 100);
// Step 2: Compare with fitWidth
// Use whichever is smaller (more zoomed out) to ensure both constraints are met
// Use whichever zoom is smaller (more zoomed out) to satisfy both width and height constraints
if (heightBasedZoom < fitWidthZoom) {
// Need to zoom out from fitWidth to show enough height
return { type: 'adjust', zoom: heightBasedZoom };