While working in cocos's compatibilty with pyglet repo, some differences in
Sprite scaling between cocos and pyglet has been spotted.
Let's compare the pyglet semantic with the cocos semantic:
pyglet:
for applications that never set scale_x nor scale_y, scale tells how much
shrink or grow the sprite image to display; 1.0 is full size, 1.20 is 20%
bigger, 0.7 is 30% smaller. scale_x and scale_y will have the same value as
scale.
for applications that want to display sprites that scale different in
horizontal and vertical, scale_x and scale_y controls the shrink/grow in
each axis.
Reading scale will give a nonsensical number if scale_x != scale_y.
Setting scale will set scale_x and scale_y at the same value, erasing any
differential scaling for horizontal and vertical. So, if at some point in
time it is desired to grow the sprite size, both scale_x and scale_y should
be multiplied by the grow factor.
cocos:
(scale_x, scale_y) controls the ratio width/height ('taller', 'fatier',...)
by shrinking/growing in the respective axis
scale aplies a resize factor over the change done by (scale_x, scale_y)
How it looks to explain some use cases
"I want to triple the size for my sprite"
+ pyglet: do scale_x *= 3; scale_y *= 3, because changing scale will alter
aspect ratio in the generic case
+ cocos: do scale *= 3
"I want to grow by 200% and then shrink to initial size a sprite
pyglet:
scale_x0, scale_y0 = scale_x, scale_y
with t-t0, interpolate in (0, (scale_x0, scale_y0)), (duration/2,
(3*scale_x0, 3*scale_y0)),
(duration, (scale_x0, scale_y0))
(scale_x, scale_y) = scale_x0, scale_y0
cocos:
scale0 = scale
with t-to, interpolate in (0, scale0), (duration/2, 3*scale0), (duration,
scale0)
scale = scale0
The oocos way looks more convenient to me: easier to explain, no special
cases, simpler user code.
So:
- what pyglet users think ?
- pyglets devs are willing to consider to change to the cocos semantics ?
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