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 ImageEn Library for Delphi, C++ and .Net
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 Rotate Image and its layers at 180 Degree
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yogiyang

India
600 Posts

Posted - May 15 2020 :  08:43:27  Show Profile  Reply
Hello,

I am using following to rotate image and all its layers at 180 degree
ImageEnView1.LayersRotateAll(180, False, True);

But this is not giving the result that I want.
Here is what I am getting:


But what I want is this:
.

Any ideas as to how can we achieve this?

I have spend a whole day trying to get the math to calculate the location of layers after rotating them 180 degree.

Please help.

TIA


Yogi Yang

yogiyang

India
600 Posts

Posted - May 16 2020 :  01:56:20  Show Profile  Reply
Hello,

It seems I have found a way though not scientifically correct but it works like a charm!!
Here is the code that I am using:

ShowTempHourglass;
ImageEnView1.LockUpdate;
ImageEnView1.LayersCurrent := 0;

//Flip Vertical and then Flip Horizontal
for I := 1 to ImageEnView1.LayersCount - 1 do
begin
  ImageEnView1.Layers[I].PosY := ImageEnView1.Layers[0].Height -
    (ImageEnView1.Layers[I].PosY + ImageEnView1.Layers[I].Height);
  ImageEnView1.Layers[I].Bitmap.flip(fdHorizontal);
  ImageEnView1.Layers[I].PosX := ImageEnView1.Layers[0].Width -
    (ImageEnView1.Layers[I].PosX + ImageEnView1.Layers[I].Width);
  ImageEnView1.Layers[I].Bitmap.flip(fdVertical);
end; 

//Flip Background
ImageEnView1.Layers[0].Bitmap.flip(fdHorizontal);
ImageEnView1.Layers[0].Bitmap.flip(fdVertical);

ImageEnView1.UnlockUpdate;
ImageEnView1.Update;


HTH


Yogi Yang
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xequte

5227 Posts

Posted - May 17 2020 :  03:59:58  Show Profile  Reply
Hi Yogi

Yes, when ImageEn rotates a layer it does not reposition it. It would be a nice option in a future version.

Nigel
Xequte Software
www.imageen.com
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yogiyang

India
600 Posts

Posted - May 18 2020 :  00:44:14  Show Profile  Reply
Hello Nigel,

This 180 degree rotation works but I am finding it hard to calculate locations of layers when rotated at 90 degree.

I read somewhere on net that we can use Cos and Sin but am not able to find any functions in Delhi that will calculate and return Cos and Sin and again I don't know as to how to implement.

If you have any ideas do share.

TIA


Yogi Yang
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xequte

5227 Posts

Posted - May 18 2020 :  18:16:01  Show Profile  Reply
Hi Yogi

Please look in hyieutils.pas. There are whole bunch of useful methods to calculate positions/sizes after rotation.


Nigel
Xequte Software
www.imageen.com
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