Function doOverGrid

Parameters

• dimensions: { h: number; w: number }

  of grid

• num: { numCols: number; numRows: number }

  cols and rows

• cellFn: (
      __namedParameters: {
          indexPos: { colIx: number; rowIx: number };
          pixelPos: SimpleXY;
      },
  ) => void

  a function to be called for each cell. it'll be passed the pixel coords and grid coords.