Mid-term round_dance.py

09.10 Digital Signal Processing , python 0 Comments

This is my first post in this blog. I already have this blog since around 4 years ago, but never used. that's because I just follow the trend to create an account when at that time "Blogging/Blogger" terms became so popular. Purpose doing this is to submit my presentation and some individual debugging about this program. Hope this note will help others, at least to know about what round dance is. Let's start... From [1] written that Round Dance is dancing that progresses in a circular pattern, counter-clockwise around the dance floor.





Here some step of round dance[2] :

Phase I			Phase II			Phase II (con't)
Away and Together			Basketball Turn (Two-Step)			Roll
Box			Box, Left Turning			Spin Maneuver
Circle Away			Box, Right Turning			Solo Turning Box
Pickup			Forward ( or Forward Waltz)			Thru Side Close
Recover			Lace			Thru Twinkle
Reverse Box			Lunge			Twinkle
Waltz Away and Together (Waltz)			Maneuver			Twirl Vine
			Pivot			Twisty Vine
			Progressive Box			Wheel
			Reverse Twirl

To translate that kind of rules, Python offer a good environment with its library called Turtle. Here is based on the original program of turtle demo in python there are 2 major parts in this program, first one is create a shapes and do round dancing .  When implemented in python, here is the code:

• Create shape

def create_shape():
 #before draw any graphic clear the screen
 clearscreen()
 bgcolor("gray10")
 #Set tracing off to decrease flickering
 tracer(False)
 #create circle shape
 shape("circle")
 #set the size of circle when create circle inside circle
 f = 0.793402
 #degree between one triange to another
 phi = 2.064678
 
 #length of the center circle when first initiate and will be increament
 #also fix length of each circle around the center circle
 s = 5
 
 c = 1
 # create compound shape
 #it will iterate over the _item array and add the listener to each individual shape
 sh = Shape("compound")

 """
 this loop will create iterate circle inside circle with different size 
 """
 for i in range(10):
 shapesize(s)
 #this will get value of poly shape 
 p =get_shapepoly()
 s *= f
 c *= f
 tilt(-phi)
 #to make several shape with different color
 sh.addcomponent(p, (c, 0.35, 1-c), "black")
 register_shape("multitri", sh)
 # create dancers
 shapesize(1)
 shape("multitri")

• Create dance

def create_dance(): 
 #this method will Pull the pen up – no drawing when moving
 pu()

 #set starting point in the center of the screen
 setpos(0, -200)
 dancers = []

 """
 this loop will draw 12 shapes around the center shape
 """
 for i in range(180):
 # the same with forward() Move the turtle forward 7 point, in the direction the turtle is headed
 fd(7)

 # rotate turtle -4 degree
 tilt(-4)

 # turn turtle to left 2 degree
 lt(2)

 # perform TurtleScreen update, because tracer(false)
 update()

 
 if i % 12 == 0:
 dancers.append(clone())

 # home() : this function will be Move turtle to the origin – coordinates (0,0) – and set its heading to its start-orientation
 # to make the center dancer increase its size periodically 
 home()
 # dance
 # set true for running
 running = True

 # when user press any key will stop running (call the stop function) 
 onkeypress(stop)
 listen()
 cs = 1
 """
 when running is true program will do looping all the dancers
 and the center dancer will be increase it shapesize 0.005 in one cycle
 and update its size
 """
 
 while running:
 ta = -4
 """
 this for loop to keep rotate the all the shape
"""
 for dancer in dancers:
 dancer.fd(7)
 dancer.lt(2)
 dancer.tilt(ta)
 ta = -4 if ta > 0 else 2
 #if center shape size still less than 180 the shape will keep increase its size until 180
 if cs < 180:
 right(4)
 shapesize(cs)
 cs *= 1.005
 update()
 return "DONE!"

When we run the program :






[1] http://en.wikipedia.org/wiki/Round_dance [2] http://www.mssquaredance.com/Steps.htm