How to use

drawPoint

method

in

org.pentaho.di.core.gui.GCInterface

protected void drawGrid() {
 Point bounds = gc.getDeviceBounds();
 for ( int x = 0; x < bounds.x; x += gridSize ) {
  for ( int y = 0; y < bounds.y; y += gridSize ) {
   gc.drawPoint( x + ( offset.x % gridSize ), y + ( offset.y % gridSize ) );
  }
 }
}