java/examples/Topics/Image Processing/LinearImage/LinearImage.pde

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+/**
+ * Linear Image. 
+ * 
+ * Click and drag mouse up and down to control the signal. 
+ * Press and hold any key to watch the scanning. 
+ *
+ * Updated 28 February 2010.
+ */
+ 
+PImage img;
+int direction = 1;
+
+float signal;
+
+void setup() {
+  size(200, 200);
+  stroke(255);
+  img = loadImage("florence03.jpg");
+  img.loadPixels();
+  loadPixels();
+}
+
+void draw() {
+  if (signal > img.height-1 || signal < 0) { 
+    direction = direction * -1; 
+  }
+  if (mousePressed) {
+    signal = abs(mouseY % img.height);
+  } else {
+    signal += (0.3*direction);  
+  }
+
+  if (keyPressed) {
+    set(0, 0, img);
+    line(0, signal, img.width, signal);
+  } else {
+    int signalOffset = int(signal)*img.width;
+    for (int y = 0; y < img.height; y++) {
+      arrayCopy(img.pixels, signalOffset, pixels, y*width, img.width);
+    }
+    updatePixels();
+  }
+}

java/examples/Topics/Image Processing/LinearImage/applet/LinearImage.java

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+import processing.core.*; 
+
+import java.applet.*; 
+import java.awt.*; 
+import java.awt.image.*; 
+import java.awt.event.*; 
+import java.io.*; 
+import java.net.*; 
+import java.text.*; 
+import java.util.*; 
+import java.util.zip.*; 
+import java.util.regex.*; 
+
+public class LinearImage extends PApplet {
+
+/**
+ * Linear Image. 
+ * 
+ * Click and drag mouse up and down to control the signal. 
+ * Press and hold any key to watch the scanning. 
+ */
+ 
+PImage a;
+boolean onetime = true;
+int[] aPixels = new int[200*200];
+int direction = 1;
+
+float signal;
+
+public void setup() 
+{
+  size(200, 200);
+  stroke(255);
+  a = loadImage("florence03.jpg");
+  for(int i=0; i<width*height; i++) {
+    aPixels[i] = a.pixels[i];
+  }
+}
+
+public void draw() 
+{
+  if (signal > width-1 || signal < 0) { 
+    direction = direction * -1; 
+  }
+
+  if(mousePressed) {
+    signal = abs(mouseY%height);
+  } else {
+    signal += (0.3f*direction);  
+  }
+  
+  
+  if(keyPressed) {
+    loadPixels();
+    for (int i=0; i<width*height; i++) { 
+      pixels[i] = aPixels[i];  
+    }
+    updatePixels();
+    line(0, signal, width, signal);
+  } else {
+    loadPixels();
+    for (int i=0; i<width*height; i++) { 
+      pixels[i] = aPixels[PApplet.parseInt((width*PApplet.parseInt(signal))+(i%width))];
+    }
+    updatePixels();
+  }
+  
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "LinearImage" });
+  }
+}

java/examples/Topics/Image Processing/LinearImage/applet/LinearImage.pde

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+/**
+ * Linear Image. 
+ * 
+ * Click and drag mouse up and down to control the signal. 
+ * Press and hold any key to watch the scanning. 
+ */
+ 
+PImage a;
+boolean onetime = true;
+int[] aPixels = new int[200*200];
+int direction = 1;
+
+float signal;
+
+void setup() 
+{
+  size(200, 200);
+  stroke(255);
+  a = loadImage("florence03.jpg");
+  for(int i=0; i<width*height; i++) {
+    aPixels[i] = a.pixels[i];
+  }
+}
+
+void draw() 
+{
+  if (signal > width-1 || signal < 0) { 
+    direction = direction * -1; 
+  }
+
+  if(mousePressed) {
+    signal = abs(mouseY%height);
+  } else {
+    signal += (0.3*direction);  
+  }
+  
+  
+  if(keyPressed) {
+    loadPixels();
+    for (int i=0; i<width*height; i++) { 
+      pixels[i] = aPixels[i];  
+    }
+    updatePixels();
+    line(0, signal, width, signal);
+  } else {
+    loadPixels();
+    for (int i=0; i<width*height; i++) { 
+      pixels[i] = aPixels[int((width*int(signal))+(i%width))];
+    }
+    updatePixels();
+  }
+  
+}