How to display the Y value of a data point when mouse over

[QTech]

How do I display the Y value of a data point when the mouse is over (on top of) the data point? I have TeeChart Standard v8.05.50522 Win32 on Delphi 2007.

[Yeray]

Hi QTech,

This would be easy with TeeChart Pro as it includes Mark Tips Tool that does exactly what you say.

In TeeChart Standard, you could use OnMouseMove event to test if the mouse is over a series point. You should call the series clicked method on every mouse movement to test if your series is under the new mouse position. Then, you'll have the series value index of the "clicked" point (or -1 if none) and you could use that at OnAfterDraw event to draw your custom rectangle with text where you want.

Let me remark that all this is what Mark Tips Tool makes for you in the Professional version and it also has other features, such as allowing you to define a mouse delay (delay before showing the mark) and a hide delay (time before hiding the mark).