ResourceView: Drawing on a specific position on the timeline - Scheduling and Gantt Components

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ResourceView: Drawing on a specific position on the timeline (Read 3942 times)

Achim Junior Member Offline MindFusion rocks! Posts: 70 Location: Bayreuth, Germany Joined: Jun 28^th, 2012	ResourceView: Drawing on a specific position on the timeline Jul 2^nd, 2012 at 12:58pm	Print Post
	Hi there, I want to draw a symbol on an Item which works - in general - very fine using Custom Drawing events. But now I realized that the drawing coordinates are relative to the _visible_ part of the Item. That means when the ResourceView shows five days for example, and the calendar item is ten days, i'm not able to draw a symbol on day two because when the timeline is scrolled the symbol stays relative to the visible area. Is there any possibility to draw relative to the item's virtual origin? Thanks in advance Achim


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Meppy God Member Offline MindFusion support Posts: 1783 Joined: Jul 20^th, 2005	Re: ResourceView: Drawing on a specific position on the timeline Reply #1 - Jul 2^nd, 2012 at 2:24pm	Print Post
	Hi, There is no easy way to do this. It is possible, but it will require to perform some calculations manually. The following example draws (hopefully) a red mark at the second day after the item's start: Code DateTime from = calendar1.GetDateAt(e.Bounds.Left + (int)e.Graphics.Transform.OffsetX, e.Bounds.Top); DateTime to = calendar1.GetDateAt(e.Bounds.Right + (int)e.Graphics.Transform.OffsetX, e.Bounds.Top); DateTime mark = e.Item.StartTime.AddDays(2); if (from <= mark && mark <= to) { int distance = (int)(bounds.Width * ((double)mark.Ticks - from.Ticks) / (to.Ticks - from.Ticks)); e.Graphics.DrawLine(Pens.Red, bounds.Left + distance, bounds.Top, bounds.Left + distance, bounds.Bottom); } There is an ugly bit in the above code because the supplied drawing rectangle is not in Calendar coordinates and we need to translate it using the current graphics transformation. I hope this helps. Regards, Meppy


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Achim Junior Member Offline MindFusion rocks! Posts: 70 Location: Bayreuth, Germany Joined: Jun 28^th, 2012	Re: ResourceView: Drawing on a specific position on the timeline Reply #2 - Jul 3^rd, 2012 at 6:41am	Print Post
	Hi Meppy, many thanks for that! I had not yet discovered the .Transform-Property. But tell me: why do think this is ugly? Ok, it would be more elegant, when the Calendar-Control could provide more information about the element being drawn. But this solution seems to be adequate. Once again: thank you very much! Achim


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Meppy God Member Offline MindFusion support Posts: 1783 Joined: Jul 20^th, 2005	Re: ResourceView: Drawing on a specific position on the timeline Reply #3 - Jul 3^rd, 2012 at 7:16am	Print Post
	The ugly bit is that the bounding rectangle needs to be converted to client coordinates. This is not initially obvious nor is it documented and in most cases the user would not care. Regards, Meppy


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