To continue the series of how to use Processing.py, this article demonstrates how to use basic shapes, placements and colors.

For the previous entry in the Processing.py series, see this page:

Processing.py: How to draw lines and use mouse events

This code demonstrates the use of lines, rectangles, ellipses, colors and placements by sketching a simple scene programmatically.

def setup():
    size(500, 500)
    
def draw():
    # Make all lines black
    stroke(0)
    
    # draw a horizon line 70% of the way down from the top
    # starting at the left side (0) and ending on the right (width)
    line(0, .70*height, width, .70*height)
    
    # Create the foreground grass
    fill('#99cc00')
    rect(0, .70*height, width, .70*height)
    
    # Create the sky
    fill('#ccfff5')
    rect(0, 0, width, .70*height)
    
    # draw the stem so that it sits on the horizon
    fill('#669900')
    rect(width/2-5, .70*height-100, 5, 100)
     
    # draw the petals
    fill('#3399ff')
    ellipseMode(CENTER)
    
    ellipse((width/2)+10, .70*height-80, 30, 30)
    ellipse((width/2)+10, .70*height-120, 30, 30)
    
    ellipse((width/2)-10, .70*height-80, 30, 30)
    ellipse((width/2)-10, .70*height-120, 30, 30)
    
    ellipse((width/2)-20, .70*height-100, 30, 30)
    ellipse((width/2)+20, .70*height-100, 30, 30)
    
    # draw the center of the flower
    fill('#ffdf80')
    ellipseMode(CENTER)
    ellipse((width/2), .70*height-100, 25, 25)

    # draw sun rays
    line(0, 0, 120, 10)
    line(0, 0, 120, 20)
    line(0, 0, 120, 30)
    line(0, 0, 120, 40)
    line(0, 0, 110, 50)
    line(0, 0, 100, 60)
    line(0, 0, 90, 70)
    line(0, 0, 80, 80)
    line(0, 0, 70, 90)
    line(0, 0, 60, 100)
    line(0, 0, 50, 110)
    line(0, 0, 40, 110)
    line(0, 0, 30, 110)
    line(0, 0, 20, 110)
    line(0, 0, 10, 110)

    # draw the sun
    fill('#ffff00')
    ellipseMode(CENTER)
    ellipse(0, 0, 150, 150)
    
    saveFrame("sun_and_flower.jpg")

Which produces:

For more information, see these pages:
http://py.processing.org/tutorials/overview/
http://py.processing.org/tutorials/drawing/
http://py.processing.org/tutorials/color/