Sparrow Forum

1. 

   emrahozer
   Member

   Hi guys,

   I'm an actionscript developer who is trying to migrate to objective c completely. When i found out your framework i was happy like i found a gold mine

   I'm trying to port one of my games to iphone. Which has lots of path drawing on runtime. This game is something like a flight control game.

   My question is:
   When i searched for custom drawing i found out that you made a work around for that using CoreGraphics which is adding a block parameter to SPTexture.

   I'm looking for the best solution to draw enterframe to a texture. As i figured out there is no way to call the draw method after the initilization ( or is there ? )

   Should i create texture initializing with the appropriate draw algorithm on enter frame and remove the previous ones? What is the best practice?

   Thanks alot again for this beatiful framework.

   Posted 9 months ago #
2. 

   Daniel
   Primary Feather

   Hello and welcome to the Sparrow forum! Thanks for the nice words, it's always great to hear feedback like this!

   You're right, the draw block is only available on initialization time. The reason is that you cannot edit a texture that is already in graphics memory; you can only create a new one and send that to the GPU instead.

   Thus, graphics that are dynamic and animated are a little difficult to create. Furthermore, creating a new texture in every frame has a negative effect on performance, as you will have guessed.

   An alternative would be to draw the lines (if they are simple lines) with OpenGL instead, which is very fast. Shilo has created an extension for single lines that might help you get started.

   Another alternative would be to try out SPRenderTexture and see if the performance is fast enough. That is a texture than can be updated without recreating the whole texture in each frame.

   I hope that gets you started!

   Posted 9 months ago #
3. 

   emrahozer
   Member

   Thanks for your quick answer.

   I'm sorry there are lots of bezier stuff in the game. Simple line wont be the solution. Is there any way to use sparrow as a layer or subview of uiview ?

   Posted 9 months ago #
4. 

   Daniel
   Primary Feather

   Yes, you can display an UIView directly on top of Sparrow content. The property "nativeView" of the stage returns the SPView Sparrow renders into. Being a normal view, you can add subviews to that view.

   Posted 9 months ago #
5. 

   emrahozer
   Member

   Ok i'll give a try for that. i think that will be the solution for my case. By the way i tried to update SpRenderTexture but it draws only objects. I cant find a way to call draw method. if it can work with core graphics that would be solution too.

   Posted 9 months ago #
6. 

   Daniel
   Primary Feather

   Mhm, the render texture can only be modified via OpenGL calls, so that isn't ideal for you, either. That said, you could (in theory) draw lots of points (images with a circle as texture) on the path you want to draw, until it looks like a line. But I suppose that would be too slow when you've got to draw a long line in a short time.

   Posted 9 months ago #
7. 

   emrahozer
   Member

   Thanks for your support Daniel. I'll enter a sample of code if i can manage to success.

   Posted 9 months ago #

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