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Set book page bounds and physical cover width

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This commit is contained in:
Georg Tomitsch
2026-06-05 17:19:40 +02:00
parent f00072282e
commit 80d29ed2d2
2 changed files with 6 additions and 23 deletions
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public/js/webgl-book-shape-lab.js
+5 -22
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@@ -70,11 +70,12 @@ const FAST_FLIP_COUNT = 10;
const FAST_FLIP_OVERLAP = 5; const FAST_FLIP_OVERLAP = 5;
const OPEN_SEAM_GAP = 0.003; const OPEN_SEAM_GAP = 0.003;
const PAGE_COUNT_MIN = 40; const PAGE_COUNT_MIN = 40;
const PAGE_COUNT_MAX = 500;
const PAGE_COUNT_STEP = 10; const PAGE_COUNT_STEP = 10;
const PAGE_WIDTH = 1.62;
const PAGE_SPLINE_LENGTH = 1.955;
const PAGE_LINE_SEGMENTS = 48; const PAGE_LINE_SEGMENTS = 48;
const PAGE_DEPTH = 2.24; const PAGE_DEPTH = 2.24;
const PAGE_WIDTH = PAGE_DEPTH * 2 / 3;
const PAGE_SPLINE_LENGTH = PAGE_WIDTH;
const COVER_DEPTH = 2.30; const COVER_DEPTH = 2.30;
const COVER_OVERHANG = (COVER_DEPTH - PAGE_DEPTH) * 0.5; const COVER_OVERHANG = (COVER_DEPTH - PAGE_DEPTH) * 0.5;
const COVER_SUPPORT_OVERHANG = COVER_OVERHANG; const COVER_SUPPORT_OVERHANG = COVER_OVERHANG;
@@ -259,7 +260,7 @@ function rebuildBook() {
activeSpineHalf = spineHalf; activeSpineHalf = spineHalf;
activeCoverOuterX = spineHalf + pageWidth + COVER_OVERHANG; activeCoverOuterX = spineHalf + pageWidth + COVER_OVERHANG;
const lines = simulatePageLines(bundleCount, pageWidth, pageSplineLength, spineWidth, foreEdgeX, bundleSpacing, leftCount); const lines = simulatePageLines(bundleCount, pageWidth, pageSplineLength, spineWidth, foreEdgeX, bundleSpacing, leftCount);
const coverOuterX = solvedStackOuterX(lines) + COVER_OVERHANG; const coverOuterX = spineHalf + pageWidth + COVER_OVERHANG;
activeCoverOuterX = coverOuterX; activeCoverOuterX = coverOuterX;
lastLengthError = measureLineLengthError(lines, pageSplineLength); lastLengthError = measureLineLengthError(lines, pageSplineLength);
lastSpacingError = measureStackSpacingError(lines, bundleSpacing); lastSpacingError = measureStackSpacingError(lines, bundleSpacing);
@@ -427,25 +428,7 @@ function calculateSpineWidth(bundleCount) {
} }
function calculateMaximumPageCount() { function calculateMaximumPageCount() {
let maximum = PAGE_COUNT_MIN; return PAGE_COUNT_MAX;
for (let candidate = PAGE_COUNT_MIN; candidate <= 1000; candidate += PAGE_COUNT_STEP) {
const bundleCount = Math.max(4, Math.round(candidate / 10));
if (!isBundleCountReachable(bundleCount)) break;
maximum = candidate;
}
return maximum;
}
function isBundleCountReachable(bundleCount) {
const spineWidth = calculateSpineWidth(bundleCount);
const bundleSpacing = calculateBundleSpacing(bundleCount, spineWidth, bundleCount);
const foreEdgeX = spineWidth * 0.5 + PAGE_WIDTH;
const target = restingTarget(1, foreEdgeX, bundleCount - 1, bundleCount, bundleSpacing);
const anchor = spineCurvePoint(1, spineWidth);
const chordLength = Math.hypot(target.x - anchor.x, target.y - anchor.y);
const solverSlack = PAGE_SPLINE_LENGTH - chordLength;
const minimumSlack = PAGE_SPLINE_LENGTH / (PAGE_LINE_SEGMENTS + 1);
return solverSlack >= minimumSlack;
} }
function calculateBundleSpacing(bundleCount, spineWidth, leftCount) { function calculateBundleSpacing(bundleCount, spineWidth, leftCount) {
public/webgl-book-shape-lab.html
+1 -1
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@@ -74,6 +74,6 @@
<button id="fast_forward" type="button">Fast Forward</button> <button id="fast_forward" type="button">Fast Forward</button>
<output id="flip_count">0 / 10</output> <output id="flip_count">0 / 10</output>
</div> </div>
<script type="module" src="/js/webgl-book-shape-lab.js?v=flip-arclength-width-1"></script> <script type="module" src="/js/webgl-book-shape-lab.js?v=page-ratio-cover-width-1"></script>
</body> </body>
</html> </html>