fixed to work with processing 4.4.1 current stable release

README

@@ -2,3 +2,4 @@ gctrl: a simple GUI for grbl
 
 A simple Processing <http://processing.org/> sketch that acts as an
 interface to grbl <http://dank.bengler.no/-/page/show/5470_grbl>.
+Download latest Processing from https://github.com/processing/processing4

gctrl.pde

@@ -1,9 +1,9 @@
 import java.awt.event.KeyEvent;
 import javax.swing.JOptionPane;
 import processing.serial.*;
-
+import javax.swing.JFrame;
 Serial port = null;
-
+// PImage img;
 // select and modify the appropriate line for your operating system
 // leave as null to use interactive port (press 'p' in the program)
 String portname = null;
@@ -12,7 +12,7 @@ String portname = null;
 //String portname = "COM6"; // Windows
 
 boolean streaming = false;
-float speed = 0.001;
+float speed = 0.1;
 String[] gcode;
 int i = 0;
 
@@ -28,7 +28,8 @@ void openSerialPort()
 
 void selectSerialPort()
 {
-  String result = (String) JOptionPane.showInputDialog(this,
+  JFrame frame = new JFrame();
+  String result = (String) JOptionPane.showInputDialog(frame,
     "Select the serial port that corresponds to your Arduino board.",
     "Select serial port",
     JOptionPane.PLAIN_MESSAGE,
@@ -44,37 +45,47 @@ void selectSerialPort()
 
 void setup()
 {
-  size(500, 250);
+  size(500, 350);
+  openSerialPort();
+  //img = loadImage("myImage.png");  // <-- Make sure your image is in the data folder!
   openSerialPort();
 }
 
 void draw()
 {
   background(0);  
   fill(255);
-  int y = 24, dy = 12;
-  text("INSTRUCTIONS", 12, y); y += dy;
-  text("p: select serial port", 12, y); y += dy;
-  text("1: set speed to 0.001 inches (1 mil) per jog", 12, y); y += dy;
-  text("2: set speed to 0.010 inches (10 mil) per jog", 12, y); y += dy;
-  text("3: set speed to 0.100 inches (100 mil) per jog", 12, y); y += dy;
-  text("arrow keys: jog in x-y plane", 12, y); y += dy;
-  text("page up & page down: jog in z axis", 12, y); y += dy;
-  text("$: display grbl settings", 12, y); y+= dy;
-  text("h: go home", 12, y); y += dy;
-  text("0: zero machine (set home to the current location)", 12, y); y += dy;
-  text("g: stream a g-code file", 12, y); y += dy;
-  text("x: stop streaming g-code (this is NOT immediate)", 12, y); y += dy;
+  textSize(16);
+  int y = 24, dy = 18;
+  text("INSTRUCTIONS", 22, y); y += dy;
+
+  text("p: select serial port", 18, y); y += dy;
+  text("Press 1,2 or 3 to set jog amount ", 22, y); y += dy;
+  text("1: set speed to 1 mm per step (1,0 mm) per jog", 18, y); y += dy;
+  text("2: set speed to 2.5 mm per step (2,5 mil) per jog", 18, y); y += dy;
+  text("3: set speed to 5.0 mm per step (5 mm) per jog", 18, y); y += dy;
+  text("arrow keys: jog in x-y plane", 18, y); y += dy;
+  text("page up & page down: jog in z axis", 18, y); y += dy;
+  text("$: display grbl settings", 18, y); y+= dy;
+  text("h: go home", 18, y); y += dy;
+  text("0: zero machine (set home to the current location)", 18, y); y += dy;
+  text("f: stream a g-code file", 18, y); y += dy;
+  text("x: stop streaming g-code (this is NOT immediate)", 18, y); y += dy;
   y = height - dy;
-  text("current jog speed: " + speed + " inches per step", 12, y); y -= dy;
-  text("current serial port: " + portname, 12, y); y -= dy;
+  text("current jog speed: " + speed + " mm per step", 18, y); y -= dy;
+  text("current serial port: " + portname, 18, y); y -= dy;
+
+  // Draw the image on the right side
+  //int imgX = width - img.width - 20;  // 20 pixels padding from right edge
+  //int imgY = 20;                      // 20 pixels from top
+  //image(img, imgX, imgY);
 }
 
 void keyPressed()
 {
-  if (key == '1') speed = 0.001;
-  if (key == '2') speed = 0.01;
-  if (key == '3') speed = 0.1;
+  if (key == '1') speed = 1.0;
+  if (key == '2') speed = 2.5;
+  if (key == '3') speed = 5.0;
 
   if (!streaming) {
     if (keyCode == LEFT) port.write("G91\nG20\nG00 X-" + speed + " Y0.000 Z0.000\n");
@@ -143,4 +154,3 @@ void serialEvent(Serial p)
   if (s.trim().startsWith("ok")) stream();
   if (s.trim().startsWith("error")) stream(); // XXX: really?
 }
-