Heroes who know how to implement a drawing board at the pixel level

For example, several users across the touchpad to get a point, and then connect these points into a single segment.
The thickness of the line can be set up.

Products are made on the iphone, because this part of the function is a small part of a project, the test will be published in the future consider android, so there is no development with objective c, but with unity3d do it.

Algorithm implementation is now in the middle of adding N multi-point, and then each stipple a ball into a line. However, the low efficiency, as well as the problem is not optimized boundary. What better way to achieve it.

Thank you
Reply:
cocos2d game engine should be fine.
However, you use a graphics library CG iphone beginning of it can also be achieved.
I do not know what your needs are level.