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Arduino potentiometer and video using loadPixels

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- 29-Feb-2012 07:59 AM
- Forum: Integration and Hardware
Hi, I am very new to the Processing world.
I am currently working on a project using a potentiometer that determines the size of a connected video camera's Pixels.

There are two problems, (1) the range of the pot (val) is 0-255, however I can only go down to about 50 before the program freezes/gives me an ArrayOutOfBoundsException error.

(2) I was wondering if it is at all possible to stop loadPixels at some point?

here is my code, and help is greatly appreciated:

import processing.serial.*;

Serial port;

float val;

import processing.video.*;

Capture cam;

//import fullscreen.*;

//FullScreen fs;

int cellSize = 10;

int cols, rows;

void setup() {

background(000);

size(1920, 1200);

//fs = new FullScreen(this);

//fs.enter();



cols = 1920 / cellSize;

rows = 1080 / cellSize;

colorMode(RGB, 255, 255, 255, 100);



cam = new Capture(this, 2020, 1180);

size(1920,1080);

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

port = new Serial(this, arduinoPort, 9600);

}

void draw() {

if (cam.available() == true) {

cam.read();

image(cam, 0, -120);

if (port.available() > 0) {

val = port.read();

println(val);

}



cam.loadPixels();



background(0);

float cs = float(cellSize);

cs = val;

cs = map(cs, 0, 255, 0, 45);



cols = 1920 / int(cs);

rows = 1080 / int(cs);



// Begin loop for columns

for (int i = 0; i < cols; i++) {

// Begin loop for rows



for (int j = 0; j < rows; j++) {

int x = int(i*cs);

int y = int(j*cs);

int loc = (cam.width + x - 1) + y*cam.width;



float r = red(cam.pixels[loc]);

float g = green(cam.pixels[loc]);

float b = blue(cam.pixels[loc]);

color c = color(r, g, b, 100);



pushMatrix();

translate(x+cs/2, y+cs/2);

rectMode(CENTER);



fill(c);

noStroke();

rect(i, j, cs+41, cs+14);

popMatrix();

}

}

}

}

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