ID Number: Q81472
1.00
WINDOWS
Summary:
When you use the Graph custom control, the ExtraData property will not
always generate an "Invalid Property Value" error when you assign it
invalid numbers. ExtraData has different valid ranges, depending on
which GraphType you are using. The widest range is from 0 to 15,
inclusive. Even if values between 0 and 15 are not within the
documented range for an individual GraphType, they will not generate
an error.
This information applies to Microsoft Professional Toolkit for
Microsoft Visual Basic programming system version 1.0 for Windows.
More Information:
If you are using the 3-D bar graph (GraphType = 4), the ExtraData
property holds the color values for the sides of the bars. Color
values range from 0 to 15, so the legal values for ExtraData also
range from 0 to 15. If you are using the 2-D pie graph (GraphType = 1)
or the 3-D pie graph (GraphType = 2), the value of ExtraData will
determine whether or not a pie piece is exploded from the graph. The
documented range for ExtraData with pie graphs is from 0 to 1, where 0
= False and 1 = True. In practice, however, the range for ExtraData
with pie graphs is from 0 to 15, where even values equal False and odd
values equal True.
To reproduce this behavior, do the following:
1. Run Visual Basic, or from the File menu, choose New Project (ALT,
F, N) if Visual Basic is already running. Form1 is created by
default.
2. From the File menu, choose Add File. In the Files box, select the
GRAPH.VBX custom control file. The Graph tool will appear in the
toolbox.
3. Add a graph control (Graph1) to Form1.
4. In the Properties list box, set the following values and
properties:
Property Value
-------- -----
GraphType 2
DrawMode 2
NumSets 1
NumPoints 5
ExtraData 0, 1, 14, 15, 16
As you assign the values for ExtraData, you will see
- No change when ExtraData is set to 0.
- The second data point will be exploded when ExtraData is set to 1.
- No change when ExtraData is set to 14 (even numbers less than
16 = FALSE).
- The fourth data point will be exploded when ExtraData is set to 15
(odd numbers less than 16 = TRUE).
- An "Invalid Property Value" message generated when ExtraData is set
to 16.
Additional reference words: 1.00