Drawing Shapes on TCharts

[0scar]

Hi, I'm struggling with the TChart framework to create a small application which draw quadratic functions. I am not very experienced with all the functionality of the framework. I hope the community can share some expertise.

My application:
Any 3 points form a quadratic/parabola. I managed to draw quadratic functions based on 3 points from user input using TLineSeries.

My problem:
Wat I would like to do is to create 3 shapes on the chart representing the 3 user input point. I would like to be able to move these points with the mouse and recalculate the quadratic. I have trouble with creating the 3 shapes on top of the chart. I have tried the DragMarks functionality, but these do not seem to work exactly as I would like to. Painting a square over the 3 points do display the points, but cannot be moved.

Somebody has a sugggestion?

[Yeray]

Hi,

Give it a try to the TRectangleTool. This tool supports drag and resize. I guess you aren't interested in resize, so you could disable it.

[0scar]

Thanks for the suggestion. I will give it a try.

Regards,
Oscar