Handling anim images

BlitzMax Forums/BlitzMax Beginners Area/Handling anim images

Ashes

(Posted 2016) [#1]

I am trying to create an animation strip from multiple single frame pngs.

I make a new image variable:

 spriteImage = CreateImage(frameWidth * frameCount, frameHeight, frameCount)

and use a for loop to add each frame to the newly created image

 
frameImage = LoadImage(filePath + compositeFileName)
If frameImage = Null Then RuntimeError("something happened with one frame image")
	
frameImgPixmap = LockImage(frameImage)
UnlockImage(frameImage)
	
spriteImgPixmap = LockImage(spriteImage)
spriteImgPixmap.Paste(frameImgPixmap, currentFrame * ImageWidth(frameImage), 0)
UnlockImage(spriteImage)

All is fine until this point. Now I want to draw various frames from it and cant do it, frame 0 is the whole image. How do I use this image as an anim image without saving it and loading it with loadanimimage? Is there a way to specify the cell width and height?

Thanks.

TomToad

(Posted 2016) [#2]

Instead of creating an image, just create a pixmap and paste all your frames in. Then when you are done, use LoadAnimImage() to load the pixmap into the image.

Local spritePixmap:TPixmap = CreatePixmap(frameWidth * frameCount, frameHeight, frameCount,PF_RGBA8888)

for Local i:int = 0 Until FrameCount 'in your for/next loop

Local compositeFilename:String = GetCompositeFilename(i) 'get the filename of next image

Local framePixmap:TPixmap = LoadPixmap(filePath + compositeFilename)
If Not framePixmap Then RuntimeError("Something went wrong")

spritePixmap.Paste(framePixmap, currentFrame * framePixmap.Width,0)

Next

Local spriteImage:TImage = LoadAnimImage(spritePixmap,frameWidth,frameHeight,0,frameCount)

spritePixmap = Null 'Free the memory used by the pixmap

Ashes

(Posted 2016) [#3]

Thank you very much. I didn't know you can pass pixmaps as url in loadanimimage or that you can create a pixmap from loading an image.

I thought that if I can pass a pixmap as url I should be able to pass an image as well but that is not the case. Any idea why?

I also found another way, I create an image the size of a single frame with proper frame count and instead of pasting the pixmap, i use

 spriteImage.SetPixmap(currentFrame, framePixmap)

It seems that anim images in BlitzMax are just arrays of single frame pixmaps.