Why do text items have different results on the screen?

Pada_

Hello,

I have two development environments.

1.Windows8.1 64bit graphics 1920x1080 (moniter 15.6 inch)
2. Linux 64Bit Graphics 1920x1080 (moniter 23 inch)

I created QTextEdit using QProxyWidget in QGraphicsScene.

The size of this item is 300x300,
The font size of the text in the item is setFontSize (22) as follows.

However, in the development environment of No. 1, QTextEdit has a scroll bar, so the text is not visible.
In development environment 2, the text was clearly visible without scroll bars.

Same item size, same text size, but why this difference ??

Is there any way to look the same ??

sierdzio

DPI scaling. Windows is likely showing everything scaled up by 150%.

ODБOï

@Pada_
You are setting font size in pixels,
depending on your screens pixel density you will have different result
https://doc.qt.io/qt-5/scalability.html

Pada_

@LeLev
@sierdzio

SetPointSize & setPixelSize exists in QFont Class.

When setting FontSize in QFont,
If setPixelSize is set, not setPointSize

Can I check the result of the same shape in development environment with different resolution?

ODБOï

@Pada_ said in Why do text items have different results on the screen?:

Can I check the result of the same shape in development environment with different resolution?

IMHO no
you can ensure the final aspect is the same on any screen by using techniques from the link

Pada_

@LeLev

I don't know what it means.

Even if you use setPixelSize, you cannot see the same result depending on the resolution.

Are you saying?

Then the size of the 300x300 item, the size of the inner text 20
Will it have to be different for every resolution?

Pada_

@LeLev
@sierdzio

QTextEdit is the same size as the photo, and Font is the same size.

The first picture is a capture picture on Linux.
The second picture is a capture picture in Windows.
Why does QTextEdit and QFont Size change strangely in WIndows? I have a scroll bar.

jsulm

@Pada_ Did you read what @sierdzio wrote? Most probably Windows is upscaling, check that in your Windows settings.

sierdzio

Why does QTextEdit and QFont Size change strangely in WIndows? I have a scroll bar.

You are using different fonts (notice that letter "t" has different shape, for example), so they can have different sizes.

Plus, as I mentioned, you very probably have DPI or font scaling enabled on Windows. As far as I know Windows used 150% scaling by default on most screen sizes nowadays.

Pada_

@jsulm
@sierdzio

I haven't looked for upscaling yet,
I think it can be done because of upscaling, as it works well on Linux OS and comes out large on other resolutions of Windows.

But why does Windows control upscaling?
Also, is there a way to get the upscaling currently applied to Windows?

Windows uses 150% by default, so

Can I create it by reducing 150%?

mrjj

Hi
You can try disable DPI scale for your app and see if that works the way you want.
https://doc.qt.io/qt-5/highdpi.html

The text factor used by Windows is controlled by the user and an app should not change that.
(unless its just for your systems and you can just change it )

Pada_

@mrjj

DPI per monitor
<Application> -Platform window: dpi awareness = 2
I set it up, but it remains the same.

Even if the window magnification is set to 125% and 150%, I would like to see it at 100%.

mrjj

@Pada_
Did you try with awareness = 0
also did going from 150 to 125, show up any different?