blue book examples

java/examples/Books/Processing Handbook/Extensions/Electronics/_05B/_05B.pde

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+// Write data to the serial port according to the status of a button controlled
+// by the mouse
+import processing.serial.*;
+Serial port; // Create serial port object
+boolean rectOver = false;
+int rectX, rectY; // Position of square button
+int rectSize = 100; // Diameter of rect
+color rectColor;
+boolean buttonOn = false; // Status of the button
+
+void setup() {
+  size(200, 200);
+  noStroke();
+  frameRate(10);
+  rectColor = color(100);
+  rectX = width / 2 - rectSize / 2;
+  rectY = height / 2 - rectSize / 2;
+// Open the port that the board is connected to and use the same speed (9600 bps)
+  port = new Serial(this, 9600);
+}
+
+void draw() {
+  update(mouseX, mouseY);
+  background(0); // Clear background to black
+  fill(rectColor);
+  rect(rectX, rectY, rectSize, rectSize);
+}
+void update(int x, int y) {
+  if (overRect(rectX, rectY, rectSize, rectSize) == true) {
+    rectOver = true;
+  } else {
+    rectOver = false;
+  }
+}
+
+void mouseReleased() {
+  if (rectOver == true) {
+    if (buttonOn == true) {
+      rectColor = color(100);
+      buttonOn = false;
+      port.write('L'); // Send an L to indicate button is OFF
+    } else {
+      rectColor = color(180);
+      buttonOn = true;
+      port.write('H'); // Send an H to indicate button is ON
+    }
+  }
+}
+boolean overRect(int x, int y, int width, int height) {
+  if ((mouseX >= x) && (mouseX <= x + width) &&
+      (mouseY >= y) && (mouseY <= y + height)) {
+    return true;
+  } else {
+    return false;
+  }
+}