54

String lastInput = new String();

String currentInput = new String();

float y = 10.0;

PFont myFont;

void setup()

{

size(200, 600);

smooth();

myFont = createFont("FFScala", 14);

textFont(myFont);

// textAlign(LEFT);

background(255, 255, 255);

fill(100);

noStroke();

}

void draw(){

ellipse (100, 100, y, y);

}

void keyPressed() {

if (key == ENTER) {

lastInput = currentInput;

currentInput = "";

background(255,255,255);

}

else if (key == BACKSPACE && currentInput.length() > 0) {

currentInput = currentInput.substring(0, currentInput.length() - 1);

}

else if (key == CODED) {

// ignore...

}

else {

currentInput = currentInput + key;

}

background(255,255,255);

text("Final value: " + lastInput, 2, height*.85);

y = changeNumber(lastInput);

println(y);

text("Input here: " + currentInput, 2, height*.75);

}

float changeNumber(String theText) {

float n = float(theText);

if(!Float.isNaN(n)) {

return n;

}

else {

println("not a number ");

return 0.0;

}

}

Applet 55 - Getting Text Input

In order to get text or numerical input from the user you will need to use a method that runs whenever the user inputs a character from the keyboard. This code does just that.

The changeNumber method returns a float if the user inputs a number, otherwise it returns a 0.0.

In this examle numerical input controls the size of a circle.