ID Number: Q81949
1.00
WINDOWS
Summary:
When using the Visual Basic Graph custom control in an EGA video mode
with the Graph control Background property value set to dark gray and
the Foreground property value set to light gray, the text on the graph
will disappear. This is a known problem with Windows version 3.0. This
is not a problem with the Graph custom control or with Visual Basic
1.0 for Windows.
Microsoft has confirmed this to be a problem with Microsoft Windows
versions 3.0 and 3.0a. We are researching this problem and will post
new information here as it becomes available.
More Information:
Windows 3.0 defines dark gray as the color created when red=128,
blue=128, and green=128. Windows defines light gray as the color
created when red=192, blue=192, and green=192.
Windows 3.0 and 3.0a, when given light gray text on a dark gray
background in EGA video mode, will alter the value of the text color
to dark gray (the closest representation it can make in that video
mode). The subsequent dark gray text on a dark gray background makes
it appear as though the text has disappeared.
The Visual Basic Graph custom control allows you to set the background
and foreground colors to 16 predefined colors. Colors 7 and 8 are
light gray and dark gray, respectively. Graph uses Windows values for
dark gray and light gray, and so displays the same video problems as
Windows itself.
Steps to Reproduce Problem
--------------------------
1. Set the video mode of Windows to EGA.
2. Re-enter Windows if necessary and start Visual Basic.
3. In the Visual Basic environment with the VB Graph custom control
loaded, create a form (Form1).
4. Add a Graph custom control (Graph1).
5. Set Graph1.DrawMode=2 (draw).
6. Set Graph1.Background=8 (dark gray) and Graph1.Foreground=7 (light
gray).
The text disappears, leaving colored bars on a dark gray background.
Additional reference words: 1.00