ImageEn for Delphi and C++ Builder ImageEn for Delphi and C++ Builder

 

ImageEn Forum
Profile    Join    Active Topics    Forum FAQ    Search this forumSearch
 All Forums
 ImageEn Library for Delphi, C++ and .Net
 ImageEn and IEvolution Support Forum
 function Rotate (small angle turn)

Note: You must be registered in order to post a reply.
To register, click here. Registration is FREE!

View 
UserName:
Password:
Format  Bold Italicized Underline  Align Left Centered Align Right  Horizontal Rule  Insert Hyperlink   Browse for an image to attach to your post Browse for a zip to attach to your post Insert Code  Insert Quote Insert List
   
Message 

 

Emoji
Smile [:)] Big Smile [:D] Cool [8D] Blush [:I]
Tongue [:P] Evil [):] Wink [;)] Black Eye [B)]
Frown [:(] Shocked [:0] Angry [:(!] Sleepy [|)]
Kisses [:X] Approve [^] Disapprove [V] Question [?]

 
Check here to subscribe to this topic.
   

T O P I C    R E V I E W
brm121966 Posted - Aug 17 2022 : 09:40:08
Hello.
I use the image rotation function Proc.Rotate(0.1) and look at the result;
After 10-100 applications, the image rotates and I see the result, but the result is terrible. The picture is corrupted. The picture is blurry when using ierFast. Other TIAntiAliasMode methods also give bad results.
In the examples, the effect is the same.
Are there options for the correct operation of the function.
Thank you.
P.S. FastStone rotate image by 0.1 degree 10-100 times correctly.

Rudolf
3   L A T E S T    R E P L I E S    (Newest First)
xequte Posted - Aug 25 2022 : 16:17:45
Hi Rudolf

This is the method to do with the EffectsChain functionality of 11.3.0:

// Progressively increase the image rotation by 1 deg. using an image chain (so there is no quality lost)
ImageEnView1.IEBitmap.EffectsChain.Enabled := True;
idx := ImageEnView1.IEBitmap.EffectsChain.EffectToIndex( peRotate );
if idx = -1 then
  idx := ImageEnView1.IEBitmap.EffectsChain.Add( peRotate );
ImageEnView1.IEBitmap.EffectsChain.Items[idx].Rotate_Angle := ImageEnView1.IEBitmap.EffectsChain.Items[idx].Rotate_Angle + 1;
ImageEnView1.IEBitmap.EffectsChain.Items[idx].Rotate_Antialias := ierBicubic;
ImageEnView1.Update();  // Must call update after manually setting properties


Nigel
Xequte Software
www.imageen.com
brm121966 Posted - Aug 25 2022 : 07:30:37
Thanks.


Rudolf
xequte Posted - Aug 22 2022 : 14:49:08
Hi Rudolf

You can't rotate the same image many times as rounding errors will accumulate (except when done at 90 deg).

You have two options:

1. Upcoming version supports an effects chain, so you can just update the effects chain rotation amount

2. Each time you need to rotate, reset to the original unrotated image and rotate that instead (e.g. using Undo)

Nigel
Xequte Software
www.imageen.com