Support more built-in functions

[gaocegege]

Now Processing.R supports draw, setting and some other functions but not enough.

ref https://processing.org/reference/

2D Primitives

• arc()
• ellipse()
• line()
• point()
• quad()
• rect()
• triangle()

Curves

• bezier()
• bezierDetail()
• bezierPoint()
• bezierTangent()
• curve()
• curveDetail()
• curvePoint()
• curveTangent()
• curveTightness()

Environments

• delay()
• displayDensity()
• focused
• frameCount
• frameRate()
• frameRate
• fullScreen()
• height
• noSmooth()
• pixelDensity()
• pixelHeight
• pixelWidth
• settings()
• size()
• smooth()
• width

3D Primitives

• box()
• sphere()
• sphereDetail()

Color

Setting

• background()
• clear()
• colorMode()
• fill()
• noFill()
• noStroke()
• stroke()

Creating & Reading

Blocked until #9

• alpha()
• blue()
• brightness()
• color()
• green()
• hue()
• lerpColor()
• red()
• saturation()

[PatrickMurphy]

Gaocegege, I am interested in contributing to this repo, If you have any direction of what issues, or what built in functions you would like to prioritize I would be happy to claim some of the work and send pull requests.

[gaocegege]

@PatrickMurphy Thanks for your interest 🎉

Today, I'll write some documentation about the architecture of Processing.R and tag some issues to "for new contributors". If you have any problems when you read the code, feel free to @ me in GitHub or https://gitter.im/gaocegege/Processing.R.

[gaocegege]

re @PatrickMurphy

ref #16 (comment) Processing.R will focus on 2D & 3D Primitives at the first.

Functions such as arc() and ellipse() are easy to implement. If you want to contribute, this is a good entrypoint :)