Rotate should alter dimensions [#1551262]

The rotate effect should alter the dimensions in the $image->info array. For 0 and 180 degrees it remains unchanged for 90 and 270 degrees they should be swapped. For other degrees it comes down to a formula that can be found in the related Drupal core issue #1551686: Image rotate dimensions callback can calculate new dimensions for every angle.

Comments

Comment #1

fietserwin

Le Mont-Dore

commented 28 April 2012 at 07:58

Formula from: http://stackoverflow.com/questions/3231176/how-to-get-size-of-a-rotated-...

o = angle
new x = x * sin(o) + y * cos(o)
new y = x * cos(o) + y * sin(o)

image_rotate_dimensions() in image.effect.inc in Drupal core should do the same: #1551686: Image rotate dimensions callback can calculate new dimensions for every angle

And another link that explains it: http://actionscripthowto.com/bounding-box-of-a-rotated-rectangle/

Comment #2

fietserwin

Le Mont-Dore

commented 30 April 2012 at 08:54

The formula above only works fin the 1st quadrant. I found a complete example and converted it into working Drupal PHP code (including tests) in the Drupal core issue #1551686: Image rotate dimensions callback can calculate new dimensions for every angle. It can be copied right into this module or if and when it becomes available in D7, this module can call the core code directly.

Please review and comment over there.