obsidian-excalidraw-plugin/ea-scripts/Expand rectangles vertically.md

/*

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This script expands the height of the selected rectangles until they are all the same height.

*/

const elements = ea.getViewSelectedElements();
const topGroups = ea.getMaximumGroups(elements);

const groupHeights = topGroups
  .map((g) => {
    if(g.length === 1 && (g[0].type === 'arrow' || g[0].type === 'line')) {
      // ignore individual lines
      return { minTop: 0, maxBottom: 0 };
    }
    return g.reduce(
      (pre, cur, i) => {
        if (i === 0) {
          return {
            minTop: cur.y,
            maxBottom: cur.y + cur.height,
            index: i,
          };
        } else {
          return {
            minTop: cur.y < pre.minTop ? cur.y : pre.minTop,
            maxBottom:
              cur.y + cur.height > pre.maxBottom
                ? cur.y + cur.height
                : pre.maxBottom,
            index: i,
          };
        }
      },
      { minTop: 0, maxBottom: 0 }
    );
  })
  .map((r) => {
    r.height = r.maxBottom - r.minTop;
    return r;
  });

const maxGroupHeight = Math.max(...groupHeights.map((g) => g.height));

for (var i = 0; i < topGroups.length; i++) {
  const rects = topGroups[i]
    .filter((el) => el.type === "rectangle")
    .sort((lha, rha) => lha.y - rha.y);
    
  const groupWith = groupHeights[i].height;
  if (groupWith < maxGroupHeight) {
    const distance = maxGroupHeight - groupWith;
    const perRectDistance = distance / rects.length;
    for (var j = 0; j < rects.length; j++) {
      const rect = rects[j];
      rect.y = rect.y + perRectDistance * j;
      rect.height += perRectDistance;
    }
  }
}

ea.copyViewElementsToEAforEditing(elements);
ea.addElementsToView(false, false);