Contents

1. Array(List)
2. Functions
   1. Argument / Return value
   2. Built-in Functions
   3. Import Functions(Standard Library)
3. RhinoScriptSyntax
4. Practice
   1. Random Points
   2. Matrix of Points
   3. Spiral Points Pattern

1. List(Array)

List(Array) is variable that can store multiple values. We can declare array and pick certain value from them like following:

array = [0,1,2,3,4,5,6,7,8,9]
a = array[4]
print(a)

List in python is variable length list and is able to be added or removed .

• .append(val)  – add “val” to the last value in the list
• .remove(N)  – remove “N”th value in the list

array = [] #blank list
print array
array.append(10)
print array
array.append(0)
print array
array.append('text')
print array
array.remove(0)
print array

For example, the numbers can be stored continuously in combination with For statement

array = []
for i in range(10):
    array.append(i)
print array

2. Functions

2.1. Argument / Return value

Functions are mathematical formula that have input value(=Argument) and output value(=Return value).
print() is also one of the many python’s functions (but don’t have Return value).

2.2. Built-in Functions

The Python interpreter has a number of functions built into it that are always available.

 
#############################################################
#Built-in Functions
#############################################################

#abs(x)
#Return the absolute value of a number.
a = abs(-2)
print a

#int(x)
#Return an integer object constructed from a number or string x,
i1 = int(1.2030830)
i2 = int("100")
print i1
print i2

#round(number[, ndigits])
#Return the floating point value number rounded to "ndigits" digits after the decimal point. 
#If ndigits is omitted, it returns the nearest integer to its input.
r1 = round(1.913907)
r2 = round(1.913907, 3)
print r1
print r2

2.3. Import Functions(Standard Library)

You can use any Python source file as a module by executing an import statement.

#############################################################
#Random Library
#Generate random numbers
#############################################################

#import random library
import random

#random.randint(a, b)
#Return a random integer N such that a <= N <= b. Alias for randrange(a, b+1).
r = random.randint(0, 10)
print  r

#random.uniform(a, b)
#Return a random floating point number N such that a <= N <= b for a <= b and b <= N <= a for b < a.
u = random.uniform(0.0,10.0)
print u

#############################################################
#Math Library
#Mathematical functions
#############################################################

#import math library
import math

#math.sqrt(x)
#Return the square root of x.
s = math.sqrt(9)
print s

#math.pi
#It don't have "argument" value.
#pi - Ratio of the circumference of a circle to its diameter; Pi
#The mathematical constant pi = 3.141592..., to available precision.

p = math.pi
print p

#math.e
#It don't have "argument" value.
#e - Napier's constant of natural logarithm
#The mathematical constant e = 2.718281..., to available precision.
e = math.e
print e

#math.sin(x)
#Return the sine of x radians.
s = math.sin(math.pi/4) #sin(45degrees)
print s

#math.cos(x)
#Return the cosine of x radians.
c = math.cos(math.pi/4) #cos(45degrees)
print c

#math.tan(x)
#Return the tangent of x radians.
t = math.tan(math.pi/4) #tan(45degrees)
print t

For more information, you can check — https://docs.python.org/2.7/library/index.html

*

[Tips] – import “as”

#############################################################
#Tips
#import "as" - Abbreviation definition of library name
#############################################################

#import and omit math library to m
import math as m
#import and omit random library to t
import random as r

r.uniform(0,10) #it can run.
print r

m.sqrt(9) #it can run.
print m

3. RhinoScriptSyntax

3.1. Import RhinoScriptSyntax

To use Rhino function in python, you can use rhinoscriptsyntax. Using rhinoscriptsyntax, you need to import the library. You can import the library by following:

import rhinoscriptsyntax as rs

There are bunch of functions in rhinosctiptsyntax. Followings are examples of them.

You can draw a point, circle and polyline like following

import rhinoscriptsyntax as rs

#rs.AddPoint(x, y, z)
#draw a point with x,y,z coordinates
obj1 = rs.AddPoint(0,0,0)

#rs.AddCircle(center point, radius)
#draw a circle with center point and radius
obj2 = rs.AddCircle([0,0,0], 100)

#rs.AddPolyline(list of points)
#draw a polyline with a list of points
obj3 = rs.AddPolyline([[0,0,0],[100,100,0],[200,0,0]])

You can move and copy object like following:

import rhinoscriptsyntax as rs
 
obj = rs.AddPoint(0,0,0)

#rs.MoveObject(object_id, translation_vector)
rs.MoveObject(obj, [100,0,0])

#rs.CopyObject(object_id, copy_vector)
rs.CopyObject(obj, [0,100,0])

You can get object from Rhino like following:

import rhinoscriptsyntax as rs
 
#rs.GetObject() - don't need argument
obj = rs.GetObject()

rs.CopyObject(obj, [0,100,0])

For more information, you can check at the menu bar of RhinoPython Script Editor

Help -> Pyhton Help

Or check — http://developer.rhino3d.com/api/RhinoScriptSyntax/win/

4. Practice

Please send your program data to Shuta by the end of the day
→ Submission is closed.

4.1. Random Points

Please plot points as folowing figure by python scripting

import rhinoscriptsyntax as rs
import random as rnd

rs.AddPoint(rnd.uniform(0,100),rnd.uniform(0,100),rnd.uniform(0,100))

4.2. Matrix of Points

Please plot points as folowing figure by python scripting

for i in range(5):
    for j in range(5):
        print i, j

4.3. Spiral Points Pattern

Please plot points as folowing figure by python scripting
[reference]Trigonometric functions:https://en.wikipedia.org/wiki/Trigonometric_functions

for i in range(6):
    rs.AddPoint([10*math.cos(math.pi/6*i), 10*math.sin(math.pi/6*i),0] )