2015-05-19 13:09 GMT+02:00 Christopher Coat <christopher.coat@inria.fr>:

I’m still a beginner at Pharo and all so maybe I’ll say something wrong.

One thing I didn’t say is that I use osWindow. I load an image as a Form and display it using that code :

"surface drawDuring:[:canvas | canvas pathTransform translateBy: myImage position. canvas pathTransform rotateByDegrees: anAngle. canvas setPaint: myImage image. canvas drawShape: ((size x) negated @ (size y) negated corner: size). ]. «

myImage image. return the Form.

Ok, in your drawing loop Athens will convert the form to an AthensPaint by copying the image data - on every draw call. You can - create the paint once outside of the drawDuring method. paint := surface createFormPaint: myImage image .... "in drawDuring" canvas setPaint:paint .... (You will have to take care of the paint object, because it is only valid in this vm session). - use an ImageMorph. ImageMorphs can be drawn directly as an AthensShape morph := form asMorph .... canvas drawShape:morph But I don't know if using a Morph fits well with all kind of transformations. It may happen that the morph is clipped away - I dont know for sure. You can create the morph outside of the drawing loop, but even canvas drawShape: myImage image asMorph is faster than creating directly the paint from the Form in the loop. (ImageMorphs are creating AthensPaints from its forms and they are using a cache for all paints). nicolai

Le 19 mai 2015 à 11:41, Nicolai Hess <nicolaihess@web.de> a écrit :

2015-05-19 10:46 GMT+02:00 Christopher Coat <christopher.coat@inria.fr>:

...

Hi everybody,

Hi,

...

I’m currently creating a small app to display images and move them on a screen using Athens. I have all my image loaded on start and I use a loop to clear the screen and redraw all the elements (on different place and angle) every frames.

The problem is that with morph, everything is fine, but as soon as I place a picture on a morph the FPS drop down. Even if the picture is a small one.

How do you draw the picture? Is it an ImageMorph or do you use directly Athens for drawing the image?

nicolai

...

Does anybody have faced the same issue ? Or is there any better way to do it ?

Thanks Chris