Gantt Chart : changing subtask color on click

[callisto]

Hi!
I just started using jfreechart and I have some difficulties with the gantt chart.
I created a gantt chart with multiple subtasks. Some of the subtasks from the different tasks are connected and I'd like all the connected subtasks to change color when one of them is clicked.
Does anyone know how to do this?

[callisto]

Any idea on how to proceed?

[MNusinov]

Try something similar to this. It has worked for me.

Code: Select all

public class SelectionEnabledGanttRenderer extends GanttRenderer {
	private int selectedRow=-1;
	private int selectedColumn=-1;
	
	@Override
	public Paint getItemPaint(int row, int column) {
		
		Paint p = super.getItemPaint(row, column);
		if(row==selectedRow && column==selectedColumn){
			p = Color.YELLOW;
		}
		return p;
	}
	
	public int getSelectedColumn() {
		return selectedColumn;
	}
	public void setSelectedColumn(int selectedColumn) {
		this.selectedColumn = selectedColumn;
	}
	public int getSelectedRow() {
		return selectedRow;
	}
	public void setSelectedRow(int selectedRow) {
		this.selectedRow = selectedRow;
	}

}

Set the renderer in the chart.getCategorPlot() to something similar to the above.

Then add a ChartMouseListener to the chartPanel. In the listener get the row and column index of the clicked entity. and set them in the renderer above

Code: Select all

public void chartMouseClicked(ChartMouseEvent e) {
		if(e.getEntity() != null){
			
			CategoryItemEntity categoryItem = (CategoryItemEntity)e.getEntity();
			
			String selectedName = categoryItem.getColumnKey().toString();
			SelectionEnabledGanttRenderer renderer = (SelectionEnabledGanttRenderer)oBase.chart.getCategoryPlot().getRenderer();
		
		renderer.setSelectedRow(0);
		renderer.setSelectedColumn(oBase.collection.getColumnIndex(s));
		oBase.chart.fireChartChanged();
}
}

[callisto]

Thank you for your answer.
I tried to implement it but it actually changes the color of all the subtasks in a task. Do you know how I could modify it to change only the color of a subtask?

[jblancx]

Hallo Calisto,
pls how did u manage to create the subtasks and connect them together. Which method did you use, i.e t1.addSubtasks ? or what.
Pls can you send me an example of the codes for subtasks creation and connectivity line . Or you can post it here to also help others.

thanks

susangilbret@yahoo.com