Expand rectangles vertically

/*

Download this file and save to your Obsidian Vault including the first line, or open it in “Raw” and copy the entire contents to Obsidian.

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 allLines = ea.getViewElements().filter(el => el.type === 'arrow' || el.type === 'line');
const allIndividualArrows = ea.getMaximumGroups(ea.getViewElements())
	.reduce((result, group) => (group.length === 1 && (group[0].type === 'arrow' || group[0].type === 'line')) ? 
			[...result, group[0]] : result, []);
 
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 groupWidth = groupHeights[i].height;
  if (groupWidth < maxGroupHeight) {
    const distance = maxGroupHeight - groupWidth;
    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;
 
      // recalculate the position of the points
      const startBindingLines = allIndividualArrows.filter(el => (el.startBinding||{}).elementId === rect.id);
     	for(startBindingLine of startBindingLines) {
     		recalculateStartPointOfLine(startBindingLine, rect);
     	}
     
     	const endBindingLines = allIndividualArrows.filter(el => (el.endBinding||{}).elementId === rect.id);
     	for(endBindingLine of endBindingLines) {
     		recalculateEndPointOfLine(endBindingLine, rect);
     	}
    }
  }
}
 
ea.copyViewElementsToEAforEditing(elements);
await ea.addElementsToView(false, false);
 
function recalculateStartPointOfLine(line, el) {
	const aX = el.x + el.width/2;
    const bX = line.x + line.points[1][0];
    const aY = el.y + el.height/2;
    const bY = line.y + line.points[1][1];
 
	line.startBinding.gap = 8;
	line.startBinding.focus = 0;
	const intersectA = ea.intersectElementWithLine(
            	el,
				[bX, bY],
            	[aX, aY],
            	line.startBinding.gap
          	);
 
    if(intersectA.length > 0) {
		line.points[0] = [0, 0];
		for(var i = 1; i<line.points.length; i++) {
			line.points[i][0] -= intersectA[0][0] - line.x;
			line.points[i][1] -= intersectA[0][1] - line.y;
		}
		line.x = intersectA[0][0];
		line.y = intersectA[0][1];
	}
}
 
function recalculateEndPointOfLine(line, el) {
	const aX = el.x + el.width/2;
    const bX = line.x + line.points[line.points.length-2][0];
    const aY = el.y + el.height/2;
    const bY = line.y + line.points[line.points.length-2][1];
 
	line.endBinding.gap = 8;
	line.endBinding.focus = 0;
	const intersectA = ea.intersectElementWithLine(
            	el,
				[bX, bY],
            	[aX, aY],
            	line.endBinding.gap
          	);
 
    if(intersectA.length > 0) {
    	line.points[line.points.length - 1] = [intersectA[0][0] - line.x, intersectA[0][1] - line.y];
	}
}