java/examples/Basics/Input/KeyboardFunctions/applet/KeyboardFunctions.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 KeyboardFunctions extends PApplet {
+
+/**
+ * Keyboard Functions. 
+ * Modified from code by Martin. 
+ * Original 'Color Typewriter' concept by John Maeda. 
+ * 
+ * Click on the window to give it focus and press the letter keys to type colors. 
+ * The keyboard function keyPressed() is called whenever
+ * a key is pressed. keyReleased() is another keyboard
+ * function that is called when a key is released.
+ */
+ 
+int max_height = 20;
+int min_height = 10;
+int letter_height = max_height; // Height of the letters
+int letter_width = 10;          // Width of the letter
+
+int x = -letter_width;          // X position of the letters
+int y = 0;                      // Y position of the letters
+
+boolean newletter;              
+
+int numChars = 26;      // There are 26 characters in the alphabet
+int[] colors = new int[numChars];
+
+public void setup()
+{
+  size(200, 200);
+  noStroke();
+  colorMode(RGB, numChars);
+  background(numChars/2);
+  // Set a gray value for each key
+  for(int i=0; i<numChars; i++) {
+    colors[i] = color(i, i, i);    
+  }
+}
+
+public void draw()
+{
+  if(newletter == true) {
+    // Draw the "letter"
+    int y_pos;
+    if (letter_height == max_height) {
+      y_pos = y;
+      rect( x, y_pos, letter_width, letter_height );
+    } else {
+      y_pos = y + min_height;
+      rect( x, y_pos, letter_width, letter_height );
+      fill(numChars/2);
+      rect( x, y_pos-min_height, letter_width, letter_height );
+    }
+    newletter = false;
+  }
+}
+
+public void keyPressed()
+{
+  // if the key is between 'A'(65) and 'z'(122)
+  if( key >= 'A' && key <= 'z') {
+    int keyIndex;
+    if(key <= 'Z') {
+      keyIndex = key-'A';
+      letter_height = max_height;
+      fill(colors[key-'A']);
+    } else {
+      keyIndex = key-'a';
+      letter_height = min_height;
+      fill(colors[key-'a']);
+    }
+  } else {
+    fill(0);
+    letter_height = 10;
+  }
+
+  newletter = true;
+
+  // Update the "letter" position
+  x = ( x + letter_width ); 
+
+  // Wrap horizontally
+  if (x > width - letter_width) {
+    x = 0;
+    y+= max_height;
+  }
+
+  // Wrap vertically
+  if( y > height - letter_height) {
+    y = 0;      // reset y to 0
+  }
+}
+
+  static public void main(String args[]) {
+    PApplet.main(new String[] { "KeyboardFunctions" });
+  }
+}