NtTimeChartControl.SheetLeftDt Property

The NtTimeChartControl covers the time range from year 0 to year 9999. But it does not display the entire range at once. Instead it picks a certain range out of that large time span and prepares it for display. This certain range is called 'sheet' because it is like a huge sheet of paper where all data objects that cover the sheet's area are being drawn on. The sheet is bigger than what you see on the screen both in vertical and horizontal direction. For this reason you can move around the sheet by scrolling horizontally and vertically (or even drag the sheet with the mouse). In vertical direction the sheet is limited by the first and the last data row. In horizontal direction the sheet is limited by certain time stamps called SheetLeftDt and SheetRightDt. These are shown in the following graphic:

Scrolling to the left or right moves the sheet accordingly. Once you reached the end of the sheet, the NtTimeChartControl sets up a new sheet that aligns perfectly with the position of the old one so you can go on scrolling even further. SheetLeftDt and SheetRightDt are also adjusted in this process. The only thing the user notices is the scroll bar flipping back to the center, so scrolling can be repeated.

This property SheetLeftDt is a read only property that allows you to learn about the current time stamp of the left edge of the sheet. Practically you will hardly need this unless you do programming for the management of the visible objects or the scroll range management. Normally the NtTimeChartControl does all this for you.

Overload List:

Modifier / Return Value	Name and Parameters	Description
public DateTime	SheetLeftDt	The time stamp of the left edge of the sheet. Read only.

Return value:

DateTime
The time stamp of the left edge of the sheet.

Remarks:

It is important to know that the time span between left and right edge of the sheet may vary in rare cases: Think about a Time Chart that is set up for one hour per column. When daylight saving time switches, one day might be one hour longer or shorter.