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---
layout: default
---
<h3>PixelArray</h3>
<p>Click and drag the mouse up and down to control the signal and
press and hold any key to see the current pixel being read.
This program sequentially reads the color of every pixel of an image
and displays this color to fill the window.</p>
<p><a href="http://processing.org/learning/topics/pixelarray.html"><b>Original Processing.org Example:</b> PixelArray</a><br>
<div class="learning-demo"><script type="application/processing">
/* @pjs preload="data/ystone08.jpg"; crisp="true"; */
PImage img;
int direction = 1;
float signal;
void setup() {
size(200, 200);
noFill();
stroke(255);
frameRate(30);
img = loadImage("data/ystone08.jpg");
}
void draw() {
if (signal > img.width*img.height-1 || signal < 0) {
direction = direction * -1;
}
if (mousePressed) {
int mx = constrain(mouseX, 0, img.width-1);
int my = constrain(mouseY, 0, img.height-1);
signal = my*img.width + mx;
} else {
signal += 0.33*direction;
}
int sx = int(signal) % img.width;
int sy = int(signal) / img.width;
if (keyPressed) {
set(0, 0, img); // fast way to draw an image
point(sx, sy);
rect(sx - 5, sy - 5, 10, 10);
} else {
color c = img.get(sx, sy);
background(c);
}
}
</script><canvas width="200" height="200"></canvas></div></p>
<div class="code"><pre name="code" class="processing">// All Examples Written by Casey Reas and Ben Fry
// unless otherwise stated.
/* @pjs preload="data/ystone08.jpg"; crisp="true"; */
PImage img;
int direction = 1;
float signal;
void setup() {
size(200, 200);
noFill();
stroke(255);
frameRate(30);
img = loadImage("data/ystone08.jpg");
}
void draw() {
if (signal > img.width*img.height-1 || signal < 0) {
direction = direction * -1;
}
if (mousePressed) {
int mx = constrain(mouseX, 0, img.width-1);
int my = constrain(mouseY, 0, img.height-1);
signal = my*img.width + mx;
} else {
signal += 0.33*direction;
}
int sx = int(signal) % img.width;
int sy = int(signal) / img.width;
if (keyPressed) {
set(0, 0, img); // fast way to draw an image
point(sx, sy);
rect(sx - 5, sy - 5, 10, 10);
} else {
color c = img.get(sx, sy);
background(c);
}
}</pre></div>