public int row(V vertex) {
		GridPoint gridPoint = vertexPoints.get(vertex);
		if (gridPoint != null) {
			return gridPoint.row;
		}
		return 0;
	}
Returns the column of the initial vertex in this grid.
@return the column of the initial vertex in this grid
Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/layout/GridLocationMap.java