From af8cf348feb8e6bb4bda4a277b06a0f41ff890d9 Mon Sep 17 00:00:00 2001
From: Josh Kingsley <josh@joshkingsley.me>
Date: Sun, 26 Oct 2025 19:41:01 +0200
Subject: feat(web): show selected subdivisions

---
 web/src/components/grid/renderGrid.ts | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

(limited to 'web/src/components/grid/renderGrid.ts')

diff --git a/web/src/components/grid/renderGrid.ts b/web/src/components/grid/renderGrid.ts
index 7ef8813..e6a2c54 100644
--- a/web/src/components/grid/renderGrid.ts
+++ b/web/src/components/grid/renderGrid.ts
@@ -6,6 +6,8 @@ export interface RenderedCell extends Cell {
   cellRef: CellRef;
   renderedRowIndex: number;
   rect: Rect;
+  startRatio: Ratio;
+  endRatio: Ratio;
 }
 
 export interface RenderedRow {
@@ -26,6 +28,7 @@ function renderCell(
   renderedRowIndex: number,
   topLeftX: number,
   topLeftY: number,
+  startRatio: Ratio,
 ): RenderedCell {
   const width = cell.widthRatio
     .divideRatio(grid.baseCellWidthRatio)
@@ -34,7 +37,9 @@ function renderCell(
 
   const rect = new Rect(topLeftX, topLeftY, width, grid.baseCellSize);
 
-  return { ...cell, cellRef, rect, renderedRowIndex };
+  const endRatio = startRatio.add(cell.widthRatio);
+
+  return { ...cell, cellRef, rect, renderedRowIndex, startRatio, endRatio };
 }
 
 function renderRow(
@@ -54,6 +59,7 @@ function renderRow(
   }
 
   let topLeftX = 0;
+  let startRatio = Ratio.fromInteger(0);
 
   const renderedCells = row.cells.map((cell, cellIndex) => {
     const cellRef = { ...rowRef, cellIndex };
@@ -65,9 +71,11 @@ function renderRow(
       renderedRowIndex,
       topLeftX,
       topLeftY,
+      startRatio,
     );
 
     topLeftX = renderedCell.rect.bottomRight.x;
+    startRatio = renderedCell.endRatio;
 
     return renderedCell;
   });
@@ -125,3 +133,12 @@ export default function renderGrid(grid: Grid) {
   const rect = renderedRows[0].rect.extend(renderedRows.at(-1)!.rect);
   return { ...grid, rect, renderedRows };
 }
+
+export function getRenderedCell(
+  grid: RenderedGrid,
+  cellRef: CellRef,
+): RenderedCell | undefined {
+  const rowsPerPart = grid.renderedRows.length / grid.parts.length;
+  const renderedRowIndex = cellRef.partIndex * rowsPerPart + cellRef.rowIndex;
+  return grid.renderedRows[renderedRowIndex]?.renderedCells[cellRef.cellIndex];
+}
-- 
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