Customizing the vertical lines of the gantt sheet

Question

How to customize IlvVerticalGanttGrid?

Answer

You can customize the vertical lines that show on the Gantt sheet by extending the IlvVerticalGanttGrid class and overriding the method draw(Graphics dst, IlvGanttGridContext gc).

You can for example override the draw method as follows to specify a particular paint and stroke for the vertical lines :

public class MyVerticalGanttGrid extends IlvVerticalGanttGrid {
  public void draw(Graphics dst,IlvGanttGridContext context) {
    Graphics2D g2d = (Graphics2D) dst;
    g2d.setPaint(getForeground());
    g2d.setStroke(new BasicStroke(6));
    Shape[] shapes = getGridShapes(dst, false, context);
    for (int i = 0; i < shapes.length; i++) {
      g2d.draw(shapes[i]);
    }
  }
};

Then you simply set your customized vertical Gantt grid to your Gantt sheet as follows :

MyVerticalGanttGrid grid = new MyVerticalGanttGrid();
sheet.setVerticalGrid(grid);

You can also, for instance, choose to draw one vertical line per hour as in the screen shot below. In order to achieve this, you need to create a class which extends IlvVerticalGanttGrid and override the draw method. In this method, you need to test if the lvHourTimeScaleRow is visible, and if it is visible, compute the array of all rectangles that correspond to every hour in the visible part of the Gantt chart, and draw a flat rectangle corresponding to every visible hour. For other type of rows (for instance for IlvMonthTimeScaleRow), just call super.draw(...).

Here is the source code of the above screen shot, based on the ganttChart sample.