Shear a sprite according to a specific angle ?

[Joubarbe]

Hi,

I'd like to know if it's possible to "shear" a sprite without losing too much quality, according to a given angle. In fact, I'd like to do the same thing I do in Photoshop : skew the image at a vertical angle of 3°, from this image :



to this one :



Or is it better to load my already sheared image into PB ?

[True29]

i think photoshop do a little bit antialiasing.

[Joubarbe]

Yep, that's why a simple TransformSprite() won't give a good result.

[STARGÅTE]

You can set SpriteQuality(#PB_Sprite_BilinearFiltering) and use TransformSprite() with self calculated corners (instead of RotateSprite). And try to move the sprite some sub-pixel like +0.5 for x and y

[Joubarbe]

Currently I was using (always with PB_Sprite_BilinearFiltering) :

Code: Select all

dbg = SpriteWidth(spr)
dbg2 = SpriteHeight(spr)
TransformSprite(spr, 0, 0, #PB_Default, dbg, 5, #PB_Default, dbg, dbg2 + 5, #PB_Default, 0, dbg2, #PB_Default)

But as you probably guess, that gives aliasing. The only solution I see is to load my sprites as images and use the gDrawing library to draw them into a sprite with the gShear function. That's not ideal, because I need to have the same image twice...