Drawing using Processing

Processing is a simple programming environment to help user create interactive animations. easygraphics.processing is a processing-like animation framework.

In processing, we override (redefine) some key functions to tell the framework how to work.

In the following program, we redefined two functions in processing to draw a rotating star.

The function setup() is called by the framework when the program begins.

We use it to do preparing works, such as defining window size, setting foreground , background color and frame refresh rate(fps), and so on.

The function draw() is called by the framework to draw frames.

Each time before a frame is to be displayed, this function is called.

Finally we use run_app(globals()) to start the processing frame work.

from easygraphics.processing import *
from easygraphics import *

# this overriding function is called by processing at the beginning
def setup():
    set_size(800, 600)
    set_fill_color("red")

t = 0

# this overriding function is called by processing every frame
def draw():
    global t
    clear()
    t = t + 1
    t = t % 360
    translate(400, 300)
    rotate(t)
    begin_shape()
    for i in range(5):
        vertex(100, 0)
        rotate(144)
    end_shape(True)


# run the processing app
run_app(globals())