Question

Hi, I’d like to color columns for certain days in a different color with the phGantTimePackage. Could you pleace provide an example on how to achieve this with the OnGantAreaDrawBackground handler?

Thanks!

Answer

In order to do this you must know when a day starts and stops in pixels, this is easily found by sending in a datetime to the IphGantX3.DateToPixel method.

So in pseudo code I would go like this:

int numberOfDaysOnScreen=Round(phGant.Stop-phGant.Start)
for i=0 to numberOfDaysOnScreen-1 do
begin
  DateTime oneDay=phGantt.Start+i
  Color c=GetColorForThisDay(oneDay)
  int PixelForStartOfDay=phGantt.DateToPixel(Trunc(oneDay))
  int PixelForEndOfDay=phGantt.DateToPixel(Trunc(oneDay)+1)
  DrawColoredRectangle(PixelForStartOfDay,0,PixelForEndOfDay,Gantt.Height)
end