#!/usr/bin/env python-i
# SUMMON examples
# 03_basics.py - more complex building before add_group()

# make summon commands available
from summon.core import *
import summon


# create a new window
win = summon.Window("03_basics")


# a function for drawing a commonly used shape
def arrow():
    white = color(1,1,1)
    red  = color(1,0,0)
    blue = color(0,0,1)
    
    return group(quads(white, 0, 0,        # right fin
                       red,   40, -40,
                       red,   40, -80,
                       white, 0, -40,

                       white, 0,0,         # left fin
                       blue,  -40, -40,
                       blue,  -40, -80,
                       white, 0, -40),

                       lines(white, 0,0, 0, 100)) # shaft


def drawArrows(narrows):
    # In this example we will dynamically build up a group.
    # Start a list to which we will append drawing elements.
    vis = []
    
    # add several arrows to our list, each translated and rotated differently
    for x in range(0, narrows):
        vis.append(
            translate(x*100, 0, 
                rotate(x*-10, arrow())))

    # now convert our list to a single group!
    g = group(*vis)
    
    # return the group to who ever wants it
    return g


# change the background color to dark green
win.set_bgcolor(0, .5, 0)


# add a row of arrows
win.add_group(drawArrows(10))

# draw row of arrows flipped!
win.add_group(translate(0, -200, 
                        flip(100, 0, drawArrows(10))))


# center the "camera" so that all shapes are in view
win.home()