Question

X/Y scaling with MSChart type 2dXY

Asked by: NormaPosy

VB6: My application produces an X/Y plot of data.  I am using MSChart type 2dXY.  The "autoscale" is enabled.

The X and Y axes evidently are scaled identically.  This means that, if the span of data for X, and that for Y, are not equal, the plot is not a square.

The span of data to be plotted varies.
My X data ranges from 0 to perhaps 1000.  My Y data typically goes from 0 to 100 or 200.
This produces a really "squished" picture.

I would like to specify the actual screen dimensions of the plot, no matter how the scale numbers are autoscaled.  Is this possible?

This is a simple plot, and it occurred to me that I could take the trouble to write the code to do my own plot.  But it would be easier to use MSChart, if I could force it to the screen dimensions I want.

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Asked On
2009-07-03 at 14:58:09ID24543164
Topic

Visual Basic Programming

Participating Experts
1
Points
500
Comments
2

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Answers

 

by: BrianVSoftPosted on 2009-07-04 at 01:27:20ID: 24776325

Hi again,
I have used MSChart many times, but not for a few years.. I don't remember ever having a "squashed" aspect.. It always stretched the Y axis to fill the MyChart.Height dimension..
Check if you are able to achieve a good aspect by simply placing "MyChart.Height = xx" at the end of your fill routine?
I now use my own function to draw simple 2D - multi-line charts in Picture boxes.. It is less than 50 lines of code and can be used for a variety of situations.. I can attach a code example if you continue to have trouble..

 

by: NormaPosyPosted on 2009-07-04 at 06:59:36ID: 24776927

Yes.  Me too.  I have an old code I once wrote which I can dig up.  It acceped parameters for scaling, axis labelling, etc, and just drew the plot.

For general use, autoscaling is a bit tricky.  For specific data, the scaling can be "hard wred".

You are right about how 2dXY does it.  The Y axis fills the height, and the "inches per unit" for both axes are identical, which means the X axis length is a function of the data ratio.  Should be independant and under code control.

Thank you.

20120131-EE-VQP-002

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