/**
* Loop Video with values sent from Arduino.
*
* Using an Arduino and Potentiometer, contro the playback speed of a video
* Recieve values using Serial I/O library
*/

import processing.serial.*;// import serial library


float diameter = 0.0; // the speed at which the video plays
float maxSpeed = 200.0;
float minSpeed = 1.0;



Serial myPort; // The serial port

void setup() {
size(600, 600);
smooth();
background(0);
println(Serial.list());
myPort = new Serial(this, Serial.list()[0], 9600);
}

void draw() {

ellipse(mouseX, mouseY, diameter, diameter);
}
/**
* serialEvent
*
* This function access the values coming in from the serial port
* It assigns the values to the play speed of the video, called videoSpeed
* The videoSpeed has a range of -5x to +5x normal playing speed
* These values are determined by the minSpeed and maxSpeed variables
* If you alter them you can change the range of speed the video will play
* For this to work, an Arduino must be sending one byte through the serial port
*/
void serialEvent (Serial myPort) {
// get the byte:
int inByte = myPort.read();
diameter = map(inByte, 0, 255, minSpeed, maxSpeed);
// print it:
println(inByte);
}

// This can be tested with using the keys if you are unable to access and Arduino and potentiometer
// The UP key increases the speed and the DOWN key decreases the speed
void keyPressed() {
if(keyCode == UP) {
diameter += 0.1;
diameter = constrain(diameter, minSpeed, maxSpeed);
}
if(keyCode == DOWN) {
diameter -= 0.1;
diameter = constrain(diameter, minSpeed, maxSpeed);
}
println("adjusted diameter with keys to: " + diameter);
}