text input problem

Programming Questions

mvb678

in Programming Questions • 9 months ago

Hi I found the following code on the internet that allows the user to input date:

String typedText = "your text here";
PFont font;
void setup() {
size(400, 400);
font = createFont("Helvetica", 18);
}
void draw() {
background(255);
fill(255,0,0);
textFont(font,18);
line(0,0,200,200);
// this adds a blinking cursor after your text, at the expense of redrawing everything every frame
text(typedText+(frameCount/10 % 2 == 0 ? "_" : ""), 35, 45);
}
void keyReleased() {
if (key != CODED) {
switch(key) {
case BACKSPACE:
typedText = typedText.substring(0,max(0,typedText.length()-1));
break;
case TAB:
typedText += " ";
break;
case ENTER:
case RETURN:
// comment out the following two lines to disable line-breaks
typedText += "\n";
break;
case ESC:
case DELETE:
break;
default:
typedText += key;
}
}
}

For this to work properly a background(255); in draw{} is executed every loop to 'refresh' the sketch and draw the updated text. Is there a simple way how this can be done without using background(255) in the draw method?

In other words if I modify the program above so that it generates a random number as show below, the number will be show in my sketch (it is only shown when background(255) is removed).

String typedText = "your text here";
PFont font;
void setup() {
size(400, 400);
font = createFont("Helvetica", 18);
randomNumber();
}
void draw() {
background(255);
fill(255,0,0);
textFont(font,18);
line(0,0,200,200);
// this adds a blinking cursor after your text, at the expense of redrawing everything every frame
text(typedText+(frameCount/10 % 2 == 0 ? "_" : ""), 35, 45);
}
void keyReleased() {
if (key != CODED) {
switch(key) {
case BACKSPACE:
typedText = typedText.substring(0,max(0,typedText.length()-1));
break;
case TAB:
typedText += " ";
break;
case ENTER:
case RETURN:
// comment out the following two lines to disable line-breaks
typedText += "\n";
break;
case ESC:
case DELETE:
break;
default:
typedText += key;
}
}
}
void randomNumber()
{
textFont(font,50);
int i=(int)random(0,10);
text(i,250,250);
}

Any help on this issue is highly appreciated thanks guys :)

Replies(1)

PhiLho

Re: text input problem

9 months ago

Just move the randomNumber() call from setup() to the end of draw().
If you need the number to be stable (not changing on every frame), make a global int variable, call random() in setup() and assign it to your global variable, and make randomNumber() to use this variable instead of the local i.

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