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benny
85
Primitive HitTest
posted

In short, I need to be able to do XY-Hit Test on primitives. I've attached a screen shot and although the cursor is missing I hope you understand what I'm trying to accomplish.. 

I've overriden the mousedown, mouseup, mousemove and onpaint methodsUltrachart Selection and can therefore draw a "selection region" in the chart. The purpose is to be able to draw a selection and get a list of chart items that are within that region. That information is later used to do further drilling in the dataset. Drilling by only selection one data point is _not_ an option in my application. 

So, how do I accomplish true XY-hit testing? I've found no information on the forum/web and having spent hours testing and digging the source has not gotten me anywhere. 

Please Help. :)

 

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  • 85
    Suggested Answer
    posted

    Solved it..

    As previously stated, I use UltraChart as the base class for a new user control in which I override MouseDown, MouseMove and MouseUp to be able to render the selection. 

    In MouseUp I ended up doing the following; 

    1. Use reflection to access the internal member ChartCore from the UltraChart base class. 

    2. Get the number of rows and columns from the data-part of the chart layer. 

    3. Get hold of the X and Y-axises (IAdvanceAxis) from the grid-part of the chart layer. 

    4. Loop the rows and columns. 

    5. Get the numeric value (in my case always a double) from row and column using GetValue() in the data part of the chart layer. 

    6. Use IAdvanceAxis.Map for the X and Y axis to get the x and y coordinates for each data point. 

    7. Perform a hit test on each data point in correlation to the selected region. 

    8. If any data points where within the boundaries of the selcetion, raise the (new) ItemSelected-event and pass a list of RowColumnItem-objects which basically only contains the row and column index of each data point that was selected. 

    Now I can use that data to "drill down" into my dataset. :)

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