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[Not a bug] TextWidth Missmatch PB561 OS10.12-10.13
Posted: Sun Nov 12, 2017 9:23 am
by walbus
This demo code results different text lengths
Tested PB561 OS 10.12 - 10.13
Meanwhile, I assume a PB bug
It can be very unpleasant and strange for text length calculations
With nearly any text, the difference is approximately one character width
Code: Select all
CreateImage(1, 300, 100)
OpenWindow(1, 0, 0, 300, 100, "", #PB_Window_SystemMenu | #PB_Window_ScreenCentered)
StartDrawing(ImageOutput(1))
Debug TextWidth("Hello World")
twidth=TextWidth("H")+TextWidth("e")+TextWidth("l")+TextWidth("l")+TextWidth("o")+
TextWidth(" ")+TextWidth("W")+TextWidth("o")+TextWidth("r")+TextWidth("l")+TextWidth("d")
Debug twidth
Box(0, 0, twidth, 20, $FF)
DrawText(0, 0, "Hello World")
StopDrawing()
ImageGadget(1, 0, 0, 0, 0, ImageID(1))
Repeat : Until WaitWindowEvent()=#PB_Event_CloseWindow
Re: TextWidth Missmatch PB561 OS 10.12 - 10.13
Posted: Sun Nov 12, 2017 11:03 am
by Dude
As a guess, could it be due to automatic font kerning of entire words, versus no font kerning for individual characters?
Re: TextWidth Missmatch PB561 OS 10.12 - 10.13
Posted: Sun Nov 12, 2017 12:26 pm
by walbus
@Dude
Yeah, possible, it's weird.
I used it for a text stretching function
It was not easy to find out why it doesn't work correct on Macs
(A hint for BF and DrawText_EX Users : I have add a workaround for Mac, now)
Re: TextWidth Missmatch PB561 OS 10.12 - 10.13
Posted: Sun Nov 12, 2017 12:42 pm
by Wolfram
Here, on 10.7 it is both 64 and it must be both the same otherwise it makes no sense.
Re: TextWidth Missmatch PB561 OS 10.12 - 10.13
Posted: Sun Nov 12, 2017 1:04 pm
by Dude
I'm thinking because the text "AW" might only end up being 15 pixels due to kerning the two characters together; but "A" by itself might be 10, and "W" by itself might also be "10", if you know what I mean? Just guessing, though.
What happens if you do it with a fixed-with font, like Courier? That would rule out kerning as the cause.
Re: TextWidth Missmatch PB561 OS 10.12 - 10.13
Posted: Sun Nov 12, 2017 1:23 pm
by walbus
@Dude
That's logical, I think you're primarily right.
Hmmm, on Mac its also with a row "IIIIIIII"
But, as a result, my workaround for Mac is the only correct method for stretched text on all OSs, "WAWA" is ever different
The stretched text is and looking very cool
Once you've seen or used this one, you don't want to miss it