<< Chapter < Page Chapter >> Page >
To have a clear understanding of computer science terms such as those that follow, we recommend lookingat Wikipedia
scope
within a program, it is a region where a variable can be accessed and its valuemodified
global scope
defined outside the methods setup() and draw(), the variable is visible andusable anywhere in the program
local scope
defined within a code block or a function, the variable takes values that arelocal to the block or function, and any values taken by a global variable having the same name are ignored.

Array declaration and allocation

int[] arrayDiInteri = new int[10];
Got questions? Get instant answers now!

Programming structures

Conditional instructions

  • if: if (i == NMAX) { println("finished");} else {i++; }

Iterations

  • while: int i = 0; //integer counter while (i < 10) { //write numbers between 0 and 9 println("i = "+ i); i++; }
  • for: for (int i = 0; i < 10; i++) { //write numbers between 0 and 9 println("i = "+ i); }

Initializing a table of random numbers

int MAX = 10; float[] tabella = new float[MAX]; for (int i = 0; i < MAX; i++) tabella[i] = random(1); //random numbers between 0 and 1 println(tabella.length + " elements:"); println(tabella);
Got questions? Get instant answers now!

Functions

Functions allow a modular approach to programming. In Processing, in the intermediate programming mode, we can define functions other than setup() and draw() , usable from within setup() and draw() .

Example of function

int raddoppia(int i) { return 2*i; }
Got questions? Get instant answers now!

A function is characterized by the entities (with reference to the example ) :

  • return type ( int )
  • name ( raddoppia )
  • parameters ( i )
  • body ( return 2*i )

Objects and classes

A class is defined by a set of data and functions. An object is an instance of a class. Vice versa, a class is the abstractdescription of a set of objects.

For an introduction to the concepts of object and class see Objects and Classes .

Example of class

Dot myDot; void setup() { size(300,20); colorMode(RGB,255,255,255,100); color tempcolor = color(255,0,0); myDot = new Dot(tempcolor,0); } void draw() { background(0); myDot.draw(10); } class Dot { color colore; int posizione; //****CONSTRUCTOR*****// Dot(color c_, int xp) { colore = c_; posizione = xp; } void draw (int ypos) { rectMode(CENTER); fill(colore); rect(posizione,ypos,20,10); } }
Got questions? Get instant answers now!

A class is characterized by the following entities (with reference to the example ) :

  • name ( Dot )
  • data ( colore, posizione )
  • constructor ( Dot() )
  • functions (or methods, draw() )

An object (instance of a class) is declared in the same way as we declare a variable, but we have to allocate a space for it(as we did for the arrays) by means of its constructor (with reference to the example ).

  • Declaration: ( Dot myDot; )
  • Allocation: ( myDot = new Dot(tempcolor,0) )
  • Use: ( myDot.draw(10); )

For a quick introduction to the Java syntax see Java Syntax Primer

With the following draw() method we want to paint the window background with a gray whose intensity depends on the horizontal position of themouse pointer. void draw() { background((mouseX/100)*255);} However, the code does not do what it is expected to do. Why?

The variable mouseX is of int type, and the division it is subject to is of the integer type. It is necessary to perform a type casting from int to float by means of the instruction (float)mouseX .

Got questions? Get instant answers now!

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get Jobilize Job Search Mobile App in your pocket Now!

Get it on Google Play




Source:  OpenStax, Media processing in processing. OpenStax CNX. Nov 10, 2010 Download for free at http://cnx.org/content/col10268/1.14
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Media processing in processing' conversation and receive update notifications?

Ask