drawGrid method

@override void drawGrid(Canvas canvas, int gridRows, int gridColumns)

Implementation

@override
void drawGrid(Canvas canvas, int gridRows, int gridColumns) {
//    final int gridRows = 4, gridColumns = 4;
  double rowSpace = chartRect.height / gridRows;
  for (int i = 0; i <= gridRows; i++) {
    canvas.drawLine(
      Offset(0, rowSpace * i + topPadding),
      Offset(chartRect.width, rowSpace * i + topPadding),
      gridPaint,
    );
  }
  double columnSpace = chartRect.width / gridColumns;
  for (int i = 0; i <= columnSpace; i++) {
    canvas.drawLine(
      Offset(columnSpace * i, 0),
      Offset(columnSpace * i, chartRect.bottom),
      gridPaint,
    );
  }

  /// draw top grid
  canvas.drawLine(
    Offset(0, 0),
    Offset(chartRect.width, 0),
    gridPaint..color,
  );

  /// draw bottom grid
  canvas.drawLine(
    Offset(0, chartRect.bottom + mBottomPadding),
    Offset(chartRect.width, chartRect.bottom + mBottomPadding),
    gridPaint..color,
  );
}