A fast, easy to use, free, and community supported 2D game engine
ganesha
Member
What's the best way of representing a single pixel in cocos2d? It must be able to change color and be added like any other component.
It would also be good if it could represent a pixel on both a Retina display and a normal one.
I have tried CCSprite but I only get a grayscale color by changing the opacity, the color value does not affect the displayed color (using a 1 x 1 png image).
liquidfire
Member
It might be easier to just subclass CCNode and make a PointNode class, or something like that. Make it conform to the CCRGBAProtocol, and just supply glVertexPointer with the position property for the only vertex. You could even make it support glPointSize internally, as well as support as to whether or not the points should be smoothed (e.g. glEnable/Disable(GL_POINT_SMOOTH)).
EDIT: And for retina, just multiply the position by CC_CONTENT_SCALE_FACTOR() to retina-ize it.
ganesha
Member
Thanks!
Could you expand your example with some quasi code? I don't really grasp it.
Another way could be to just subclass the CCLayer and the draw method (and just draw the pixel at the end of the update cycle). Would this have any performance benefits over creating a separate object.
What you could do is create a subclass like liquidfire suggested and add a Mutable Array to it(make sure its a property too), that way inside that mutable array you could store points and within the sublcass you could draw points at the specified locations in the array... Hope this helps...
cocos
Member
The concept of having array of 1 single pixel sprites/nodes is very interesting.
It is easier to operate on one pixel sprite and have all the transformations available than to deal with bare texture.
Possibly it can work up to a few thousand of pixels before performance drops below 30fps.
That would have to be tested.
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