2D graphics programming API

Is there a standard 2D graphics API that is standard for a 2D game engine?

Like this:
http://www.createjs.com/Docs/EaselJS/classes/Graphics.html

I want to be able to draw textures using this style of 2D graphics programming and use them textures in 3D and/or 2D games made in Unity.

What should I look out to go about doing this?

I need functions like:
DrawRect
DrawLine
ForeColor

The standard stuff.

Thanks

 

I'm not sure if you are completely new to Unity3D but overall it is a different approach. I mean like completely different.

Unity3D is a much more abstract and higher level way of doing things than drawing rectangles, lines or even blitting tiles or sprites to a buffer. It is a 3D engine... always even when making a 2D game. And the workflow is drastically different from what you would do with a Graphics API.

Check out the official 2D platform game tutorial to see what I mean:
http://unity3d.com/learn/tutorials/modules/beginner/2d/2d-overview

Maybe you already know all of that. So...

There is support for drawing pixels on a texture:
http://docs.unity3d.com/ScriptReference/Texture2D.html

You should be able to use SetPixel to make your own line and rectangle drawing functions.