Well, indeed, this function doesn't exist. I don't see it in the reference... And you don't seem to have defined it.

Hi phi.Iho,

It's in this example code in reference at

http://processing.org/learning/library/simplewrite.html

Thanks,

Shane

Hi,

I see now I am missing,

boolean mouseOverRect() { // Test if mouse is over square
  return ((mouseX >= 50) && (mouseX <= 150) && (mouseY >= 50) && (mouseY <= 150));
}

I am also using the book 'Processing - A programming Handbook for Visual 
Designers and Artists' by Reas and fry.
In that book its on the next page those lines.

Thanks,

Shane

Hi,

I am getting an error

1. import processing.serial.*;
2. Serial port;
3. void setup() {
4.   size(200, 200);
5.   noStroke();
6.   frameRate(10);
7.   port = new Serial(this, 9600);
8. }
9. void draw() {
10.   background(255);
11.   if (mouseOverRect() == true) {  // If mouse is over square,
12.     fill(204);                    // change color and
13.    port.write('H');              // send an H to indicate mouse is over square
14.   }
15.   else {                        // If mouse is not over square,
16.     fill(0);                      // change color and
17.     port.write('L');              // send an L otherwise
18.   }
19.   rect(50, 50, 100, 100);         // Draw a square
20. }
21. boolean mouseOverRect() { // Test if mouse is over square
22.   return ((mouseX >= 50) && (mouseX <= 150) && (mouseY >= 50) && (mouseY <= 150));
23. }

Which gives an error

Error inside Serial.write()

In the example in reference they use

1. import processing.serial.*;
   
   Serial myPort;  // Create object from Serial class
   int val;        // Data received from the serial port
   
   void setup() 
   {
     size(200, 200);
     // I know that the first port in the serial list on my mac
     // is always my  FTDI adaptor, so I open Serial.list()[0].
     // On Windows machines, this generally opens COM1.
     // Open whatever port is the one you're using.
     String portName = Serial.list()[0];
     myPort = new Serial(this, portName, 9600);
   }
   
   void draw() {
     background(255);
     if (mouseOverRect() == true) {  // If mouse is over square,
       fill(204);                    // change color and
       myPort.write('H');              // send an H to indicate mouse is over square
     } 
     else {                        // If mouse is not over square,
       fill(0);                      // change color and
       myPort.write('L');              // send an L otherwise
     }
     rect(50, 50, 100, 100);         // Draw a square
   }
   
   boolean mouseOverRect() { // Test if mouse is over square
     return ((mouseX >= 50) && (mouseX <= 150) && (mouseY >= 50) && (mouseY <= 150));
   }

But this gives an error

ArrayIndexOutOfBoundsException: 0

Thanks,

Shane

If you have the error on the line:

String portName = Serial.list()[0];

this means that Serial.list() returns an empty array, ie. no serial port have been detected.

Hi,

This is strange, because obviously there is a sreial port as I am uploading code via a serial port to my Arduino.

Thanks,

Shane