Get Processing from processing.org. Download, extract, and launch. On Linux, just click the processing
file.
Processing requires that either OpenJDK or Java to be installed.
Processing requires a void setup()
function, which is a function that Processing expects whenever an application is launched. If you don't have a setup
function, your application still launches, but with basic Processing defaults. Try this to start with:
void setup() {
size(480,720);
}
Click the Run button in the top left corner to launch your [very simple] application: an empty window that is 480 pixels wide and 720 pixels tall.
Draw a rectangle on your canvas by invoking Processing's void draw()
function:
void draw() {
rect(10,10,80,80);
}
Click the Run button in the top left corner to launch your application.
Add some colour to your rectangle:
void draw() {
fill(8,120,90);
rect(10,10,80,80);
}
Click the Run button in the top left corner to launch your application.
Make a simple painting app:
void setup() {
size(480,720);
}
void draw() {
if (mousePressed) {
fill(20,120,90);
ellipse(mouseX,mouseY,25,25);
} else {
fill(random(10,120),random(10,80),random(20,200));
}
}
More Processing tricks: you can export your application as a standalone Java app, or as an Android .apk
as long as you have the Android SDK installed.
Processing's documentation is excellent. It has examples for all functions, with pictures.
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