Wednesday

Processing

Throughout the semester we will be working with the programming language Java. Processing is another programming language - typically seen as a dialect of java or java simplified.

Processing is completely free and built for electronic arts, new media art and visual design. It will serve as a very basic introductory language to explore and experiment in the initial couple of days.

To download processing: https://processing.org/download/

What are we trying to do?

We are going to write the most famout program ever made. The "Hello World" program.

It is a very simple program, that mostly verifies that everything is up and running.

To write a "Hello World" in processing, we are going to enter the following in the text-edit window:

println("Hello World");

Hello World in processing

To confirm that everything is working - look at the output in the console - it should look like this:

Hello World output

Pair programming

• Draw a line that is 100 pixels long

• Draw an X using lines like this:

• Change the background to white

Answer the question:

• Why does this program not work as intended:

size(100,100);
line(0,0,500,500);
background(255);
line(0,100,100,0);

• Explain: what happens in the code and how can it be fixed?

Insert the following code in the editor:

• circle(56, 46, 55);

• What happens if you double the amount in the: first, second & third parameter?

• Draw a 3 dimensional cube like this:

• Draw a complex figure - you can use any shape, line and color.

  Examples:

  

  

  

First Project

We are going to build a very simple version of the classic program MS. Paint

Insert the following code

void setup() {
  size(640, 360);
  background(102);
}

void draw() {
  stroke(255);
  if (mousePressed == true) {
    line(mouseX, mouseY, pmouseX, pmouseY);
  }
}

• Make your best effort to translate the code into a description in english / danish

• Change the background to another color

• Change the stroke to another color

• Write your name

• Screenshot your result and hand-in here:

  https://kea-fronter.itslearning.com/LearningToolElement/ViewLearningToolElement.aspx?LearningToolElementId=914731

FAQ - Common methods

Background:

https://processing.org/reference/background_.html

background(51);

Line:

https://processing.org/reference/line_.html

line(x-coordinate-start,y-coordinate-start, x-coordinate-start,y-coordinate-end)

Shapes: https://processing.org/examples/shapeprimitives.html

Triangle

https://processing.org/reference/triangle_.html

triangle(18, 18, 18, 360, 81, 360);

Rectangle

https://processing.org/reference/rect_.html

rect(81, 81, 63, 63);

Quadrilateral

https://processing.org/reference/quad_.html

quad(189, 18, 216, 18, 216, 360, 144, 360);

Ellipse

https://processing.org/reference/ellipse_.html

ellipse(252, 144, 72, 72);

Arc

https://processing.org/reference/arc_.html

arc(479, 300, 280, 280, PI, TWO_PI);

Stroke

https://processing.org/reference/stroke_.html

stroke(204, 102, 0);
rect(30, 20, 55, 55);