round circles are displayed oval

[Gerhard Sachs]

Using 4.3.6r91406, Host Windows7Pro 64Bit, Guest Windows7Pro 32Bit.
When developing Windows applications with Delphi XE4 and TeeChart, a display problem occurs.
Both images shows the output of the same exe running on the same PC, one native and one in virtual box.
The rectangle has the same size and aspect ratio in both cases, but the circle is round as it should be on native windows, but oval under Virtual Box.

Sounds to be a minor problem, but prevents me from using virtual box.

Regards
Gerhard Sachs

[mpack]

I doubt that this problem has anything to do with VirtualBox.

If you have a problem with specific PC software you should seek help from whomever is responsible for supporting that software.

[Gerhard Sachs]

When the exact same EXE on the exact same Hardware shows correct graphics on native Windows and incorrect graphics on Virtual Box then something must be wrong on Virtual Box.
I understand you if you declare this Problem as minor and rather exotic and not worth to put work on it.
But please dont try to blame something else, this IS a virtual box Problem.

Gerhard Sachs

[mpack]

If you can demonstrate that any other software has a similar problem, I might believe that the common factor is VirtualBox. Before that - not.

Even in the examples you post it's clear that the text is not transformed in the same way, nor the box with the "1 " inside it, nor the square at the center of the circle/ellipse... so what kind of bug would do that?

[Gerhard Sachs]

The example was created using TeeChart on Delphi XE4, which uses the Win32 Api.
It asked them for more Information about the way rectangles and circles are drawn.

Currently I have no other application that shows the same behaviour.
But I know for sure that the Problem does not occur on VMWare.
I will make more tests with Virtual PC and native XP and trying to find another application with the same Problem.

Gerhard Sachs

[BillG]

Looks like a simple screen resolution problem to me. What are the host and guest screen settings? Are they both the same height to width ratio?

[socratis]

the circle is round as it should be on native windows, but oval under Virtual Box.

The pictures that you posted state otherwise. The one labelled "Screenshort on native windows7" shows two ovals, while the one labelled "Screenshot on Virtual box" shows a circle (left) and an oval (right). Mislabeling?

Second, could you post the .exe so that we can try it on other VM/host combinations?

[Gerhard Sachs]

Today I made a test with MS Virtual PC which had the same Problem as Virtual Box.
To repeat it, the Exe runs on the PCs host OS and Displays properly.
The same Exe on the same PC in Virtual Box or Virtual PC does not.
This makes me believe that the Problem can not be on the Exe.
I suspect that the Software library used by the demo uses a special and seldom used way to draw its circles.

Both host and guest OS has the same Screen Resolution of 1920x1200.
If aspect Ratio would be the Problem, then the rectangles would be different, but the look the same.

And yes, the Labels on the screenshots are exchanged, sorry for the confusion.

Here is a download link to the Exe, it was too big to upload it here (14MB).
Click to download: http://www.mtspp.de/outdisk/20140204084 ... ndex.shtml

Gerhard Sachs

[socratis]

• Host: OSX 10.6.8, VBox 4.3.6
• Guest: Windows XP, 7, 8
• Resolutions: 1024x768, 1280x960, 1280x1024, 1920x1200 (full screen)
• Result: Circles in all, EXCEPT Windows XP which does behave erratically depending on the guest resolution. It only works as expected when the guest resolution is at 4:3 ratios.

[mpack]

@Socrates: is this your finding when using the OPs application, or something else?

[socratis]

The OPs application.

[Gerhard Sachs]

Here is another screenshot from may Desktop.
I ran Virtual Box and VMware on my host at the same time.
Then I startet my demo app (a little bit reduced so they all fit on one screen) on the host and on both VMs.
The left app runs on the host, the middle app in Virtual Box and the right one in VMWare, the result should be self explanatory.

I will now try to move the whole Project to VMWare.
If it works you will not here from me again in this case.

Gerhard Sachs