small refactor

app.js

@@ -1,20 +1,20 @@
 const { SerialPort } = require('serialport')
 const express = require('express')
-const bodyParser = require('body-parser')
 const app = express()
-const movement = 1000;
-import hpgl from "./hpgl.js";
+const { init, translate, circle, rectangle, to, label } = require("./hpgl.js");
+const tmi = require('tmi.js');
+
+const client = new tmi.Client({
+    channels: ['twitchplaysplotter']
+});
 
+client.connect();
 
-console.log(hpgl());
-// Create a port
 const port = new SerialPort({
     path: '/dev/ttyUSB0',
     baudRate: 9600,
 })
 
-// app.use(bodyParser.json());
-
 const toPlotter = (message) => {
     console.log("i will write to plotter ", message);
 
@@ -38,46 +38,6 @@ port.on("open", function () {
     });
 });
 
-app.post('/init', (req, res) => {
-    toPlotter(`IN;SC0,0,100,0,100;SP1;PA60,60;PU`)
-    res.send('Initialise the plotter')
-})
-
-app.post('/pen-up', (req, res) => {
-    toPlotter(`PU;`);
-    res.send("Sending a message to the plotter about PU;",)
-});
-
-
-app.post('/pen-down', (req, res) => {
-    toPlotter(`PD;`);
-    res.send("Sending a message to the plotter about PD;",)
-});
-
-
-app.post('/move-left', (req, res) => {
-    toPlotter(`PR-${movement},0;`);
-    res.send("Sending a message to the plotter about PR-10,0;",)
-});
-
-
-app.post('/move-right', (req, res) => {
-    toPlotter(`PR${movement},0;`);
-    res.send("Sending a message to the plotter about PR10,0;",)
-});
-
-
-app.post('/move-up', (req, res) => {
-    toPlotter(`PR0,${movement},0;`);
-    res.send("Sending a message to the plotter about PR0,10;",)
-});
-
-
-app.post('/move-down', (req, res) => {
-    toPlotter(`PR0,-${movement};`);
-    res.send("Sending a message to the plotter about  PR0,-10;",)
-});
-
 
 // GET /text?message={message}
 app.post('/text', (req, res) => {
@@ -97,55 +57,49 @@ app.listen(3000, () => {
     console.log(`Example app listening on port`)
 })
 
-const tmi = require('tmi.js');
-
-const client = new tmi.Client({
-    channels: ['twitchplaysplotter']
-});
-
-client.connect();
-
-let penIsUp = false;
-var initMessage = "IN;SC0,0,100,0,100;";
-
 client.on('message', (channel, tags, message, self) => {
+    const distance = 3;
 
-    console.log("\n");
     console.log(`${tags['display-name']}: ${message}`);
 
+    if (message.toLowerCase().startsWith("lb")) {
+        var words = message.toLowerCase().replace("lb", "");
+        toPlotter(label(words));
+    } else {
         switch (message.toLowerCase()) {
+            case 'init':
+                toPlotter(`PU;`);
+                break;
             case 'pu':
-            console.log("Performing a PU");
-            toPlotter(initMessage);
                 toPlotter(`PU;`);
                 break;
             case 'pd':
-            toPlotter(initMessage);
                 toPlotter(`PD;`);
                 break;
             case 'up':
-            toPlotter(initMessage);
-            console.log("Performing a move UP");
-            toPlotter(`PR0,100;`);
+                toPlotter(translate(distance * -1, 0));
                 break;
             case 'down':
-            toPlotter(initMessage);
-            toPlotter(`PR0,-100;`);
+                toPlotter(translate(0, distance));
                 break;
             case 'left':
-            toPlotter(initMessage);
-            console.log("Performing a move LEFT");
-            toPlotter(`PR-100,0;`);
+                toPlotter(translate(distance * -1, 0));
                 break;
             case 'right':
-            toPlotter(initMessage);
-            console.log("Performing a move RIGHT");
-            toPlotter(`PR100,0;`);
+                toPlotter(translate(0, distance));
+                break;
+            case 'right':
+                toPlotter(translate(0, distance));
+                break;
+            case 'rectangle':
+                toPlotter(rectangle(distance));
+                break;
+            case 'circle':
+                toPlotter(circle(distance));
                 break;
             default:
-            toPlotter(initMessage);
                 console.log("Message not recognized");
                 break;
         }
-
+    }
 });

hpgl.js

@@ -0,0 +1,72 @@
+const state = {
+  position: {
+    x: 0,
+    y: 0
+  }
+}
+
+function init(width = 4000, height = 4000) {
+  return `IN;IP0,0,${width},${height};SC0,100,0,100;SP1;  `
+}
+
+function translate(x = 0, y = 0) {
+  state.position.x += x;
+  state.position.y += y;
+
+  clampPosition();
+
+  return `PR${state.position.x},${state.position.y};`
+}
+
+function to(x = 0, y = 0) {
+  state.position.x = x;
+  state.position.y = y;
+
+  clampPosition();
+
+  return `PA${state.position.x},${state.position.y};`
+}
+
+function circle(radius, resolution = 10) {
+  return `CT${resolution};PA${state.position.x},${state.position.y};PD;CI${radius};PU;`
+}
+
+function clampPosition() {
+  if (state.position.x > 100) {
+    console.log("in the borderland");
+    state.position.x = 100;
+  } else if (state.position.x < 0) {
+    console.log("in the borderland");
+    state.position.x = 0;
+  }
+
+  if (state.position.y > 100) {
+    console.log("in the borderland");
+    state.position.y = 100;
+  } else if (state.position.y < 0) {
+    console.log("in the borderland");
+    state.position.y = 0;
+  }
+}
+
+function rectangle(width, height) {
+  if (!height) {
+    height = width;
+  }
+
+  return `PD;FT1;RR${width},${height};`
+}
+
+function label(string) {
+  return `DT$,0;SI0.5,0.8;LB${string}$;`;
+}
+
+
+module.exports = {
+  init,
+  translate,
+  circle,
+  rectangle,
+  to,
+  label
+}