TBGRACanvas2D question from tutorial page 14
lazarus / 39-Graphics

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Adri · 2020-09-03 21:11

Hello all,

When using the example from tutorial 14
(https://wiki.freepascal.org/BGRABitmap_tutorial_14) I stumble upon an
error. When compiling the IDE mentiones an error [Identifier not found
"TGBRACanvas2D"] regarding line 3 of the first, simple example where
'ctx: TBGRACanvas2D;' has been declared as a variable. (BGRABitmap and
BGRABitmapTypes are both mentioned under the 'uses' declarations).
When I remove this variable and replace every instance of 'ctx' with
'bmp.Canvas2' this first example does compile and run, but then I get
into problems with the second, 'complex shapes' example and the third
regarding 'translations' off course too.
Is anybody able to shed some light on this behavior? Is it a setting
in my IDE which understands that 'ctx' translates into
'bmp.Canvas2D'?        I cannot imagine / do not expect these examples
are wrong in any way.
Many thanks for a reaction.

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winni · 2020-09-03 21:20

Hi!

You forgot:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i uses
........,BGRACanvas2D;
Winni


PS:  BGRA graphics has its own board in this forum:
https://forum.lazarus.freepascal.org/index.php/board,46.0.html

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Adri · 2020-09-04 15:46

Winni: thanks, it works now!