can't resize an image that has been rotated?

[dunbarx]

This came from experimenting with a thread:
https://forums.livecode.com/viewtopic.php?f=7&t=37985

Anyway, if one imports an image onto a card and then sets its angle to some value, that image can no longer be resized.

Just me again?

Craig

[RCozens]

Hi Craig,

I can resize a rotated image here (LC9.6.9, Win10) by changing the height and/or width using the Property Inspector or the Message Box.

I would note that rotating an image automatically changes the image dimensions.

Cheers,

Rob

[richmond62]

I used ROTATE, and NOT set the angle.

Code: Select all

on mouseUp
   rotate img "cat" by 45
   set the width of img "cat" to 400
   set the height of img "cat" to 400
end mouseUp

Image NOT locked.
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Xubuntu Linux as MacOS 14 developer beta hoses LiveCode.

[dunbarx]

Hi.

I was unclear. One cannot resize with the pointer tool in edit mode. All the programmatic methods do indeed work.

Craig

[richmond62]

This:

Code: Select all

on mouseUp
   set the angle of img "cat" to 45
   set the width of img "cat" to 400
   set the height of img "cat" to 400
end mouseUp

did NOT work!
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MacOS 10.7.5 , LC 8.1.10

[dunbarx]

Hmmm.

My original point was this. If one imports an image file then selects the pointer tool, one can resize the image by hand. If however, one sets the angle of that image to some value, one can no longer resize with the pointer tool. No other properties have been changed by simply setting the angle (I think).

That these commands do not work on an image whose angle is not 0 is odd. Oddly, if one resets the angle back to "0", all of those other things work.

Craig

[bn]

My original point was this. If one imports an image file then selects the pointer tool, one can resize the image by hand. If however, one sets the angle of that image to some value, one can no longer resize with the pointer tool. No other properties have been changed by simply setting the angle (I think).
That these commands do not work on an image whose angle is not 0 is odd. Oddly, if one resets the angle back to "0", all of those other things work.

Craig,

At first I did not understand what you were describing and now I see the same behavior you mention.
However I think it is more a documentation omission not to mention that fact than a bug. I think it is actually a feature. Because once you set the angle of an image (via message box or Properties Inspector or code) you would change that angle when manually changing the image dimensions with the pointer tool.

Kind regards
Bernd

[bn]

I used ROTATE, and NOT set the angle.

To see the ROTATE command in action try this as script of a scrollbar

Code: Select all

on scrollbarDrag pValue
   rotate image "cat" by pValue
end scrollbarDrag

and move the scrollbar repeatedly.
Poor cat...
(It is mentioned in the dictionary)

Kind regards
Bernd

[dunbarx]

@Richmond. Yes, setting the angle of an image does not have the distortion issues that rotating does. As Bernd said, the dictionary warns about this.

@Bernd. Changing the width or height of an image distorts that image in the "usual" way. If the image shows an object "pictured" at some angle, it does not change the "angle" of the image itself, though it might look like it does. It just distorts it as usual, and the image does the best it can.

I agree this appears to have been locked on purpose, but I really do not see why. If one changes the width and height of an image in its proper proportion, one gets an accurate smaller version of that image. This might be desirable. Surely one can set those properties before setting the angle, but I still don't see the benefit of closing that option down.

Craig

[dunbarx]

When setting a new width and height of an imported image, the lockLoc must be set to true before changing the angle, or the original imported rect will be restored. Again, I do not see how this prevents unwanted behavior.

This setting of the lockLoc is essential if one wants to prevent LC from restoring the original imported rect after messing around with that image in some way. For example, if one imports an image and then changes its rect, if that image is then duplicated, the copy will be at the original rect.

Never mind setting angles, this general behavior was considered by the LC developers early on, and dealt with they way they did.

I invariably set the lockLoc immediately after importing any image.

Craig

[richmond62]

Poor cat...

Indeed: rapid degradation of the image.

Something that a fair few of us knew about about 20 years ago.

BUT, surely that is not the thing we are considering.

What we are considering (well, at least last time I looked) was how to resize, using code,
an image that had been rotated in either of the 2 ways offered by LiveCode.

As rotate chews images like a T-Rex gobbled up a small, vegetarian dinosaur,
and images rotated using set the angle don't seem to be capable of being resized,
if I were wanting to do this on a semi-fulltime basis I would hunt around for a way to do
this outwith LiveCode [GIMP springs to mind].

[richmond62]

THIS is my 'Quick-n-Dirty' way of doing things:

Code: Select all

on mouseUp
   set the angle of img "cat" to 45
   import snapshot from img "cat"
   delete img "cat"
   set the name of the last img to "cat"
   set the width of img "cat" to 400
   set the height of img "cat" to 400
end mouseUp

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Still a bit . . .
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shaggy.jpg (6.71 KiB) Viewed 9029 times

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round the edges.

[richmond62]

When I imported an SVG image into 9.6.3 and the did this:

Code: Select all

rotate img "scarab" by 45
set the width of img "scarab" to 482
set the height of img "scarab" to 560

The ONLY reason the image went 'all fuzzy' was because I was stupid enough to import and image which the internet supplier
described as an SVG, BUT was NOT drawn with vector graphics, just a bitmapped image inside an SVG wrapper.
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[richmond62]

AND here, with what is, supposedly, a vector SVG, is a complete load of rubbish:

Code: Select all

on mouseUp
   rotate img "beetle" by 45
   set the width of img "beetle" to 450
   set the height of img "beetle" to 450
   set the top of img "beetle" to 300
end mouseUp

-

[richmond62]

I wonder if this means that LC on performing a rotate on an imported SVG image converts it into a bitmapped image?