Merge pull request #7 from stweedo/ohmcalc

Add files via upload

apps/ohmcalc/ChangeLog

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+0.01: New App!

apps/ohmcalc/README.md

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+# Ohm's Law Calculator
+
+This is a simple and intuitive Ohm's Law Calculator application designed for the Bangle.js 2 Smartwatch. The calculator focuses on providing an easy-to-navigate user interface with automatic calculation logic, allowing you to quickly and efficiently calculate electrical measurements, including Voltage, Current, Resistance, and Power.
+
+## Usage Guide
+
+* __Select the Electrical Measurement:__ On the main menu, select the electrical measurement that you wish to calculate (Voltage, Current, Resistance, or Power).
+* __Enter Known Values:__ You will then be prompted to enter the known values. The application will present a menu listing the remaining electrical measurements. Select one and you will be taken to a numeric input screen. Repeat this step for the second known value.
+* __View Results:__ Once the two known values have been entered, the application will automatically calculate and display the value of the selected electrical measurement. The Results menu will show the calculated value, the unit of measurement, and the formula used for calculation.
+* __Navigation:__ Whether you're deep in calculations or perusing the results, the 'Back' button is always available to help you step back through the app. In case you'd like to start afresh from the Results menu, just tap on 'Main Menu'.
+
+## Compatibility
+
+This app was built and tested with Bangle.js 2.
+
+## Feedback
+
+If you have any issues or suggestions, please open an issue on this GitHub repository. Contributions to improve the application are also welcomed.
+
+## Creator
+
+[stweedo](https://github.com/stweedo)

apps/ohmcalc/app-icon.js

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+require("heatshrink").decompress(atob("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"))

apps/ohmcalc/app.js

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+let Layout = require("Layout");
+
+// Definitions for units and formulas for electrical measurements.
+const UNITS = {
+  "Voltage (V)": "Volts",
+  "Current (I)": "Amps",
+  "Resistance (R)": "Ohms",
+  "Power (P)": "Watts",
+};
+const FORMULAS = {
+  'Voltage (V)': {
+    'Current (I), Resistance (R)': "{0} * {1}",
+    'Power (P), Current (I)': "{0} / {1}",
+    'Power (P), Resistance (R)': "Math.sqrt({0} * {1})"
+  },
+  'Current (I)': {
+    'Voltage (V), Resistance (R)': "{0} / {1}",
+    'Power (P), Voltage (V)': "{0} / {1}",
+    'Power (P), Resistance (R)': "Math.sqrt({0} / {1})"
+  },
+  'Resistance (R)': {
+    'Voltage (V), Current (I)': "{0} / {1}",
+    'Power (P), Current (I)': "{0} / (Math.pow({1}, 2))",
+    'Power (P), Voltage (V)': "(Math.pow({0}, 2)) / {1}"
+  },
+  'Power (P)': {
+    'Voltage (V), Current (I)': "{0} * {1}",
+    'Current (I), Resistance (R)': "(Math.pow({0}, 2)) * {1}",
+    'Voltage (V), Resistance (R)': "(Math.pow({0}, 2)) / {1}"
+  },
+};
+
+// Screen positioning settings
+let btnSize = 23;
+let xCenter = g.getWidth() / 2;
+let yCenter = g.getHeight() / 2;
+
+// Variables to hold state
+let lastStringWidth = 0;
+let halfStringWidth = lastStringWidth / 2;
+let calculatedVariable;
+let selectedVariable;
+let variableValues = {};
+let inputStr = "";
+
+// Function references
+let handleEnter;
+let showVariableSelectionMenu;
+let showInputMenu;
+let resultsMenu;
+
+// Setup the layout for input buttons
+let layout = new Layout({
+  type: "v",
+  c: [
+    { type: "txt", font: "6x8:3", label: "", id: "label" },
+    { type: "h", c: "123".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: "456".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: "789".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: ".0C".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: [{ type: "btn", font: "6x8:2", label: "Enter", cb: () => { handleEnter(); }, fillx: 1, filly: 1 }] }
+  ]
+}, { lazy: false });
+
+// Clears area at the top of the screen where the text is displayed
+function clearTextArea() { // Except Back Button
+  let x2 = g.getWidth();
+  g.clearRect(0, 0, x2, btnSize);
+}
+
+// Function to clear the entire screen, except for the Back button
+function clearScreen() {
+  let x2 = g.getWidth();
+  let y2 = g.getHeight();
+  g.clearRect(btnSize, 0, x2, btnSize);
+  g.clearRect(0, btnSize, x2, y2);
+}
+
+// Function to set up and display the calculator input screen
+function showCalculatorInputScreen(variable) {
+  selectedVariable = variable;
+  layout.setUI();
+  layout.render();
+}
+
+// Function to set and display the current value of the input
+// Adjusts the font size to fit the screen width
+function setValue(newStr) {
+  clearTextArea();
+  inputStr = newStr;
+
+  // Here we check the width of the string and adjust the font size
+  // Start with a standard font size and increase if the string is too wide
+  let fontSize = "6x8:3";  // start with a standard size
+  g.setFont(fontSize);
+
+  // If the string is too long to fit on the screen, adjust the font size
+  while (g.stringWidth(inputStr) > g.getWidth() - 10 && fontSize !== "6x8:1") {
+    fontSize = "6x8:" + (Number(fontSize.split(":")[1]) - 1).toString();
+    g.setFont(fontSize);
+  }
+
+  layout.label.label = inputStr;
+  g.drawString(inputStr, layout.label.x, layout.label.y + 11);
+  lastStringWidth = g.stringWidth(inputStr);
+}
+
+// Function to handle the press of a button and append its value to the current input
+function handleButtonPress(value) {
+  inputStr = value === 'C' ? '' : inputStr + value;
+  setValue(inputStr);
+}
+
+// Function to format the unit of measurement
+function formatUnit(unit, value) {
+  return parseFloat(value) === 1 ? unit.slice(0, -1) : unit;
+}
+
+// Calculates the value of the selected variable based on the entered values
+// Also handles rounding and trimming of long decimal numbers
+function calculateValue(calculatedVariable, variableValues) {
+  let formulas = FORMULAS[calculatedVariable];
+  let formulaKeys = Object.keys(formulas);
+  for (let i = 0; i < formulaKeys.length; i++) {
+    let formulaKey = formulaKeys[i];
+    let variables = formulaKey.split(', ');
+    if (variables.every(variable => variableValues.hasOwnProperty(variable))) {
+      let formula = formulas[formulaKey];
+      let formulaValues = variables.map(variable => variableValues[variable]);
+      let calculatedValue = eval(formula.replace(/\{(\d+)\}/g, (_, index) => formulaValues[index]));
+
+      // Check if the number is an integer
+      let isInteger = Math.floor(calculatedValue) === calculatedValue;
+
+      // Round and trim long decimal numbers
+      if (!isInteger) {
+        calculatedValue = Math.round(calculatedValue * 1000) / 1000;
+        calculatedValue = calculatedValue.toString().replace(/(\.\d*?)0+$/, '$1');
+      } else {
+        calculatedValue = calculatedValue.toFixed(0);
+      }
+
+      let result = Object.entries(variableValues).map(function (entry) {
+        let variable = entry[0];
+        let value = entry[1];
+        return [variable, `${value} ${formatUnit(UNITS[variable], value.toString())}`];
+      });
+      result.push([calculatedVariable, `${calculatedValue} ${formatUnit(UNITS[calculatedVariable], calculatedValue.toString())}`]);
+      return {
+        formula: formula.replace(/\{(\d+)\}/g, (_, index) => formulaValues[index]),
+        value: calculatedValue,
+        unit: formatUnit(UNITS[calculatedVariable], calculatedValue),
+        result: result,
+      };
+    }
+  }
+}
+
+// Main function to initialize the application and setup the main menu
+(function () {
+  let mainMenu = {
+    '': { 'title': 'Ohm\'s Law Calc' },
+    '< Back': () => Bangle.showClock()
+  };
+
+  Object.keys(UNITS).forEach(unit => {
+    mainMenu[unit] = () => handleUnitSelection(unit);
+  });
+
+  // Function to present the menu for selecting the variable
+  // Filters out the calculated variable and already set variables from the menu
+  showVariableSelectionMenu = function () {
+    clearScreen();
+    let variableSelectionMenu = {
+      '': { 'title': 'Select Variable' },
+      '< Back': () => E.showMenu(mainMenu)
+    };
+    let variables = Object.keys(UNITS);
+    let remainingVariables = variables.filter(v => v !== calculatedVariable && !variableValues[v]);
+    remainingVariables.forEach(variable => {
+      variableSelectionMenu[variable] = function () {
+        showInputMenu(variable);
+      };
+    });
+    E.showMenu(variableSelectionMenu);
+  };
+
+  // Function to handle the input of variable values
+  // It sets the current selected variable and displays the calculator input screen
+  showInputMenu = function (variable) {
+    setValue("");
+    selectedVariable = variable;
+    let inputMenu = {
+      '': { 'title': variable },
+    };
+    E.showMenu(inputMenu);
+    showCalculatorInputScreen(variable);
+  };
+
+  // Function to handle the event of pressing 'Enter'
+  // It checks if the input is valid, if so, it saves the value and 
+  // either calculates the result (if enough variables are present) or opens variable selection menu
+  handleEnter = function () {
+    // Check if the input is valid
+    if (inputStr === "" || isNaN(inputStr) || (inputStr.match(/\./g) || []).length > 1) {
+      // Show error message
+      setValue("Invalid Input");
+      // Clear error message after 2 seconds
+      setTimeout(() => setValue(''), 2000);
+      return;
+    }
+
+    if (calculatedVariable === null) {
+      return;
+    }
+    variableValues[selectedVariable] = parseFloat(inputStr);
+    if (Object.keys(variableValues).length === 2) {
+      let result = calculateValue(calculatedVariable, variableValues);
+      showResultsScreen(result);
+      calculatedVariable = null;
+      variableValues = {};
+    } else {
+      setValue("");
+      showVariableSelectionMenu();
+      return;
+    }
+    return;
+  };
+
+  // Function to handle the selection of a unit of electical measurement
+  function handleUnitSelection(unit) {
+    calculatedVariable = unit;
+    showVariableSelectionMenu();
+  }
+
+  // Function to display the results screen with the calculated value
+  function drawValueScreen
+  (result) {
+    let drawPage = function () {
+      clearScreen();
+      let fontSize = g.getHeight() / 3;
+      g.setFontVector(fontSize);
+
+      // Reduce the font size until both the value and unit fit on the screen
+      while (g.stringWidth(result.value) > g.getWidth() - 20 || g.getFontHeight() > g.getHeight() / 2) {
+        fontSize--;
+        g.setFontVector(fontSize);
+      }
+
+      let valueY = yCenter - g.getFontHeight() / 2;
+      let unitY = yCenter + g.getFontHeight() / 2;
+      let valueWidth = g.stringWidth(result.value);
+      let unitWidth = g.stringWidth(result.unit);
+      let valueX = (g.getWidth() - valueWidth) / 2;
+      let unitX = (g.getWidth() - unitWidth) / 2;
+
+      g.drawString(result.value, valueX, valueY);
+      g.drawString(result.unit, unitX, unitY);
+      g.flip();
+    };
+
+    // Shows the back button on the value screen
+    return function () {
+      clearScreen();
+      let valueMenu = {
+        '': { 'title': 'Results' },
+        '< Back': function () {
+          E.showMenu(resultsMenu);
+        }
+      };
+      E.showMenu(valueMenu);
+      drawPage();
+    };
+  }
+
+  // Shows the results menu with the calculated results and options
+  function showResultsScreen(result) {
+    let backButton = function () {
+      clearScreen();
+      E.showMenu(resultsMenu);
+    };
+    g.clear();
+    resultsMenu = {
+      '': { 'title': 'Results' },
+      'Main Menu': function () {
+        E.showMenu(mainMenu);
+      },
+    };
+    resultsMenu[result.value + ' ' + result.unit] = drawValueScreen(result);
+    resultsMenu[result.formula + " = " + calculatedVariable] = {};
+    resultsMenu['Exit'] = function () {
+      Bangle.showClock();
+    };
+    E.showMenu(resultsMenu);
+  }
+
+  clearTextArea();
+  E.showMenu(mainMenu);
+
+})();

apps/ohmcalc/metadata.json

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+{
+  "id": "ohmcalc",
+  "name": "Ohm's Law Calculator",
+  "version": "0.01",
+  "description": "A smart and simple calculator for Ohm's Law calculations, designed specifically for Bangle.js 2 smartwatches. Handles voltage, current, resistance, and power calculations with smart logic to prevent invalid inputs.",
+  "icon": "app.png",
+  "type": "app",
+  "tags": "calculator, utilities, electric",
+  "supports": ["BANGLEJS2"],
+  "readme": "README.md",
+  "allow_emulator": true,
+  "storage": [{
+      "name": "ohmcalc.app.js",
+      "url": "app.js"
+    },
+    {
+      "name": "ohmcalc.img",
+      "url": "app-icon.js",
+      "evaluate": true
+    }
+  ]
+}

apps/ohmcalc/ohmcalc.js

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+let Layout = require("Layout");
+
+// Definitions for units and formulas for electrical measurements.
+const UNITS = {
+  "Voltage (V)": "Volts",
+  "Current (I)": "Amps",
+  "Resistance (R)": "Ohms",
+  "Power (P)": "Watts",
+};
+const FORMULAS = {
+  'Voltage (V)': {
+    'Current (I), Resistance (R)': "{0} * {1}",
+    'Power (P), Current (I)': "{0} / {1}",
+    'Power (P), Resistance (R)': "Math.sqrt({0} * {1})"
+  },
+  'Current (I)': {
+    'Voltage (V), Resistance (R)': "{0} / {1}",
+    'Power (P), Voltage (V)': "{0} / {1}",
+    'Power (P), Resistance (R)': "Math.sqrt({0} / {1})"
+  },
+  'Resistance (R)': {
+    'Voltage (V), Current (I)': "{0} / {1}",
+    'Power (P), Current (I)': "{0} / (Math.pow({1}, 2))",
+    'Power (P), Voltage (V)': "(Math.pow({0}, 2)) / {1}"
+  },
+  'Power (P)': {
+    'Voltage (V), Current (I)': "{0} * {1}",
+    'Current (I), Resistance (R)': "(Math.pow({0}, 2)) * {1}",
+    'Voltage (V), Resistance (R)': "(Math.pow({0}, 2)) / {1}"
+  },
+};
+
+// Screen positioning settings
+let btnSize = 23;
+let xCenter = g.getWidth() / 2;
+let yCenter = g.getHeight() / 2;
+
+// Variables to hold state
+let lastStringWidth = 0;
+let halfStringWidth = lastStringWidth / 2;
+let calculatedVariable;
+let selectedVariable;
+let variableValues = {};
+let inputStr = "";
+
+// Function references
+let handleEnter;
+let showVariableSelectionMenu;
+let showInputMenu;
+let resultsMenu;
+
+// Setup the layout for input buttons
+let layout = new Layout({
+  type: "v",
+  c: [
+    { type: "txt", font: "6x8:3", label: "", id: "label" },
+    { type: "h", c: "123".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: "456".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: "789".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: ".0C".split("").map(i => ({ type: "btn", font: "6x8:3", label: i, cb: () => { handleButtonPress(i); }, fillx: 1, filly: 1 })) },
+    { type: "h", c: [{ type: "btn", font: "6x8:2", label: "Enter", cb: () => { handleEnter(); }, fillx: 1, filly: 1 }] }
+  ]
+}, { lazy: false });
+
+// Clears area at the top of the screen where the text is displayed
+function clearTextArea() { // Except Back Button
+  let x2 = g.getWidth();
+  g.clearRect(0, 0, x2, btnSize);
+}
+
+// Function to clear the entire screen, except for the Back button
+function clearScreen() {
+  let x2 = g.getWidth();
+  let y2 = g.getHeight();
+  g.clearRect(btnSize, 0, x2, btnSize);
+  g.clearRect(0, btnSize, x2, y2);
+}
+
+// Function to set up and display the calculator input screen
+function showCalculatorInputScreen(variable) {
+  selectedVariable = variable;
+  layout.setUI();
+  layout.render();
+}
+
+// Function to set and display the current value of the input
+// Adjusts the font size to fit the screen width
+function setValue(newStr) {
+  clearTextArea();
+  inputStr = newStr;
+
+  // Here we check the width of the string and adjust the font size
+  // Start with a standard font size and increase if the string is too wide
+  let fontSize = "6x8:3";  // start with a standard size
+  g.setFont(fontSize);
+
+  // If the string is too long to fit on the screen, adjust the font size
+  while (g.stringWidth(inputStr) > g.getWidth() - 10 && fontSize !== "6x8:1") {
+    fontSize = "6x8:" + (Number(fontSize.split(":")[1]) - 1).toString();
+    g.setFont(fontSize);
+  }
+
+  layout.label.label = inputStr;
+  g.drawString(inputStr, layout.label.x, layout.label.y + 11);
+  lastStringWidth = g.stringWidth(inputStr);
+}
+
+// Function to handle the press of a button and append its value to the current input
+function handleButtonPress(value) {
+  inputStr = value === 'C' ? '' : inputStr + value;
+  setValue(inputStr);
+}
+
+// Function to format the unit of measurement
+function formatUnit(unit, value) {
+  return parseFloat(value) === 1 ? unit.slice(0, -1) : unit;
+}
+
+// Calculates the value of the selected variable based on the entered values
+// Also handles rounding and trimming of long decimal numbers
+function calculateValue(calculatedVariable, variableValues) {
+  let formulas = FORMULAS[calculatedVariable];
+  let formulaKeys = Object.keys(formulas);
+  for (let i = 0; i < formulaKeys.length; i++) {
+    let formulaKey = formulaKeys[i];
+    let variables = formulaKey.split(', ');
+    if (variables.every(variable => variableValues.hasOwnProperty(variable))) {
+      let formula = formulas[formulaKey];
+      let formulaValues = variables.map(variable => variableValues[variable]);
+      let calculatedValue = eval(formula.replace(/\{(\d+)\}/g, (_, index) => formulaValues[index]));
+
+      // Check if the number is an integer
+      let isInteger = Math.floor(calculatedValue) === calculatedValue;
+
+      // Round and trim long decimal numbers
+      if (!isInteger) {
+        calculatedValue = Math.round(calculatedValue * 1000) / 1000;
+        calculatedValue = calculatedValue.toString().replace(/(\.\d*?)0+$/, '$1');
+      } else {
+        calculatedValue = calculatedValue.toFixed(0);
+      }
+
+      let result = Object.entries(variableValues).map(function (entry) {
+        let variable = entry[0];
+        let value = entry[1];
+        return [variable, `${value} ${formatUnit(UNITS[variable], value.toString())}`];
+      });
+      result.push([calculatedVariable, `${calculatedValue} ${formatUnit(UNITS[calculatedVariable], calculatedValue.toString())}`]);
+      return {
+        formula: formula.replace(/\{(\d+)\}/g, (_, index) => formulaValues[index]),
+        value: calculatedValue,
+        unit: formatUnit(UNITS[calculatedVariable], calculatedValue),
+        result: result,
+      };
+    }
+  }
+}
+
+// Main function to initialize the application and setup the main menu
+(function () {
+  let mainMenu = {
+    '': { 'title': 'Ohm\'s Law Calc' },
+    '< Back': () => Bangle.showClock()
+  };
+
+  Object.keys(UNITS).forEach(unit => {
+    mainMenu[unit] = () => handleUnitSelection(unit);
+  });
+
+  // Function to present the menu for selecting the variable
+  // Filters out the calculated variable and already set variables from the menu
+  showVariableSelectionMenu = function () {
+    clearScreen();
+    let variableSelectionMenu = {
+      '': { 'title': 'Select Variable' },
+      '< Back': () => E.showMenu(mainMenu)
+    };
+    let variables = Object.keys(UNITS);
+    let remainingVariables = variables.filter(v => v !== calculatedVariable && !variableValues[v]);
+    remainingVariables.forEach(variable => {
+      variableSelectionMenu[variable] = function () {
+        showInputMenu(variable);
+      };
+    });
+    E.showMenu(variableSelectionMenu);
+  };
+
+  // Function to handle the input of variable values
+  // It sets the current selected variable and displays the calculator input screen
+  showInputMenu = function (variable) {
+    setValue("");
+    selectedVariable = variable;
+    let inputMenu = {
+      '': { 'title': variable },
+    };
+    E.showMenu(inputMenu);
+    showCalculatorInputScreen(variable);
+  };
+
+  // Function to handle the event of pressing 'Enter'
+  // It checks if the input is valid, if so, it saves the value and 
+  // either calculates the result (if enough variables are present) or opens variable selection menu
+  handleEnter = function () {
+    // Check if the input is valid
+    if (inputStr === "" || isNaN(inputStr) || (inputStr.match(/\./g) || []).length > 1) {
+      // Show error message
+      setValue("Invalid Input");
+      // Clear error message after 2 seconds
+      setTimeout(() => setValue(''), 2000);
+      return;
+    }
+
+    if (calculatedVariable === null) {
+      return;
+    }
+    variableValues[selectedVariable] = parseFloat(inputStr);
+    if (Object.keys(variableValues).length === 2) {
+      let result = calculateValue(calculatedVariable, variableValues);
+      showResultsScreen(result);
+      calculatedVariable = null;
+      variableValues = {};
+    } else {
+      setValue("");
+      showVariableSelectionMenu();
+      return;
+    }
+    return;
+  };
+
+  // Function to handle the selection of a unit of electical measurement
+  function handleUnitSelection(unit) {
+    calculatedVariable = unit;
+    showVariableSelectionMenu();
+  }
+
+  // Function to display the results screen with the calculated value
+  function drawValueScreenpage
+  (result) {
+    let drawPage = function () {
+      clearScreen();
+      let fontSize = g.getHeight() / 3;
+      g.setFontVector(fontSize);
+
+      // Reduce the font size until both the value and unit fit on the screen
+      while (g.stringWidth(result.value) > g.getWidth() - 20 || g.getFontHeight() > g.getHeight() / 2) {
+        fontSize--;
+        g.setFontVector(fontSize);
+      }
+
+      let valueY = yCenter - g.getFontHeight() / 2;
+      let unitY = yCenter + g.getFontHeight() / 2;
+      let valueWidth = g.stringWidth(result.value);
+      let unitWidth = g.stringWidth(result.unit);
+      let valueX = (g.getWidth() - valueWidth) / 2;
+      let unitX = (g.getWidth() - unitWidth) / 2;
+
+      g.drawString(result.value, valueX, valueY);
+      g.drawString(result.unit, unitX, unitY);
+      g.flip();
+    };
+
+    // Shows the back button on the value screen
+    return function () {
+      clearScreen();
+      let valueMenu = {
+        '': { 'title': 'Results' },
+        '< Back': function () {
+          E.showMenu(resultsMenu);
+        }
+      };
+      E.showMenu(valueMenu);
+      drawPage();
+    };
+  }
+
+  // Shows the results menu with the calculated results and options
+  function showResultsScreen(result) {
+    let backButton = function () {
+      clearScreen();
+      E.showMenu(resultsMenu);
+    };
+    g.clear();
+    resultsMenu = {
+      '': { 'title': 'Results' },
+      'Main Menu': function () {
+        E.showMenu(mainMenu);
+      },
+    };
+    resultsMenu[result.value + ' ' + result.unit] = drawValueScreen(result);
+    resultsMenu[result.formula + " = " + calculatedVariable] = {};
+    resultsMenu['Exit'] = function () {
+      Bangle.showClock();
+    };
+    E.showMenu(resultsMenu);
+  }
+
+  clearTextArea();
+  E.showMenu(mainMenu);
+
+})();