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To have a clear understanding of computer science terms such as those that follow, we recommend lookingat Wikipedia
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];
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Programming structures

Conditional instructions

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


  • 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);
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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; }
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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); } }
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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 .

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Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
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
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
How can I make nanorobot?
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
how can I make nanorobot?
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
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Source:  OpenStax, Media processing in processing. OpenStax CNX. Nov 10, 2010 Download for free at http://cnx.org/content/col10268/1.14
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