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// Processing on Raspberry Pi GPIO Example // Author: Tony DiCola // // See the guide for this sketch at: // https://learn.adafruit.com/processing-on-the-raspberry-pi-and-pitft/overview // // Released under a MIT license: // https://opensource.org/licenses/MIT

// Import hardware IO library. import processing.io.*;

// Pin numbers for the LEDs and button connected to the Pi: int redLEDPin = 22; int greenLEDPin = 27; int buttonPin = 17;

// Variables to hold the width and height of the buttons. // This will be set based on the size of the screen. int buttonWidth; int buttonHeight;

// LED state, on or off (true or false). boolean redLED = false; boolean greenLED = false;

void setup() { // Go fullscreen and hide the cursor. fullScreen(); noCursor();

// Initialize LEDs as outputs. GPIO.pinMode(redLEDPin, GPIO.OUTPUT); GPIO.pinMode(greenLEDPin, GPIO.OUTPUT);

// Initialize button as input. GPIO.pinMode(buttonPin, GPIO.INPUT);

// Turn the LEDs off. GPIO.digitalWrite(redLEDPin, false); GPIO.digitalWrite(greenLEDPin, false);

// Compute button width and height based on screen width and height. buttonWidth = width/5; buttonHeight = height/3;

// Default to drawing black lines around buttons. stroke(0, 0, 0); }

void draw() { // Check button state to see if it's pressed. Because there's a pull-up // resistor to 3.3V the button pin will be at high level until the button // is pressed and it drops to a low level. if (GPIO.digitalRead(buttonPin) == GPIO.LOW) { // Blue background when button pressed. background(0, 0, 255); } else { // Gray background when button isn't pressed. background(100, 100, 100); }

// Draw red LED button. if (redLED) { // Fill button with red when on. fill(255, 0, 0); } else { // Otherwise fill with white. fill(255, 255, 255); } rect(buttonWidth, buttonHeight, buttonWidth, buttonHeight);

// Draw green LED button. if (greenLED) { // Fill button with red when on. fill(0, 255, 0); } else { // Otherwise fill with white. fill(255, 255, 255); } rect(3*buttonWidth, buttonHeight, buttonWidth, buttonHeight); }

void mousePressed() { // Check if red LED button pressed. if (overRect(buttonWidth, buttonHeight, buttonWidth, buttonHeight)) { // Button pressed, invert the red LED state and turn on/off the LED. redLED = !redLED; GPIO.digitalWrite(redLEDPin, redLED);

} // Check if green LED button pressed. if (overRect(3*buttonWidth, buttonHeight, buttonWidth, buttonHeight)) { // Button pressed, invert the green LED state and turn on/off the LED. greenLED = !greenLED; GPIO.digitalWrite(greenLEDPin, greenLED); } }

boolean overRect(int x, int y, int width, int height) { // Check if the mouse is inside the provided box (defined by x, y position // and width, height). if (mouseX >= x && mouseX <= x+width && mouseY >= y && mouseY <= y+height) { return true; } else { return false; } }