Keyboard Lifespan Calculator
Estimate how long your keyboard will last based on your typing habits and the manufacturer’s keypress rating. This Keyboard Lifespan Calculator helps you understand the durability of your input device and plan for potential replacements.
Calculate Your Keyboard’s Estimated Lifespan
Enter the average number of hours you spend typing per day. (e.g., 8 for a full workday)
Your typical typing speed in words per minute (WPM).
The average number of characters per word you type (including space after). Standard English average is ~5.
The manufacturer’s rated lifespan for each key, typically in millions of presses. (e.g., 50 for mechanical, 10-20 for membrane)
Your Keyboard Lifespan Estimate
Estimated Keyboard Lifespan:
0.00 Years
Total Daily Keypresses: 0
Total Annual Keypresses: 0
Total Keypresses to Lifespan: 0
Formula Used:
Total Daily Keypresses = Daily Typing Duration (hours) * 60 (minutes/hour) * Average Typing Speed (WPM) * Average Word Length (characters/word)
Total Annual Keypresses = Total Daily Keypresses * 365 (days/year)
Total Keypresses to Lifespan = Keyboard Keypress Lifespan (millions) * 1,000,000
Estimated Keyboard Lifespan (Years) = Total Keypresses to Lifespan / Total Annual Keypresses
Keyboard Lifespan vs. Typing Habits
What is a Keyboard Lifespan Calculator?
A Keyboard Lifespan Calculator is a specialized tool designed to estimate the operational longevity of your computer keyboard. By taking into account various factors such as your daily typing duration, average typing speed, average word length, and the manufacturer’s specified keypress lifespan, this calculator provides a projection of how many years your keyboard is likely to function before its keys begin to fail.
This Keyboard Lifespan Calculator is invaluable for anyone who relies heavily on their keyboard, from professional writers and programmers to avid gamers and everyday computer users. It helps in understanding the impact of usage patterns on keyboard durability and can inform purchasing decisions or maintenance schedules.
Who Should Use the Keyboard Lifespan Calculator?
- Heavy Typists: Professionals like writers, coders, data entry specialists, and customer service representatives who spend many hours typing daily.
- Gamers: Who often engage in rapid, repetitive keypresses that can accelerate wear.
- Tech Enthusiasts: Curious about the real-world durability of different keyboard types (mechanical, membrane, optical).
- Budget-Conscious Buyers: To assess the long-term value of a keyboard investment.
- IT Managers: For planning equipment replacement cycles in organizations.
Common Misconceptions About Keyboard Lifespan
Many users have misconceptions about how long a keyboard should last. Here are a few:
- “All keyboards last the same amount of time.” This is false. Keyboards vary greatly in build quality, switch type, and keypress rating, leading to significant differences in lifespan.
- “My keyboard will last forever if I clean it.” While maintenance helps, it doesn’t change the fundamental mechanical lifespan of the key switches. Cleaning extends functional life by preventing dirt-related issues, not mechanical wear.
- “Expensive keyboards last much longer than cheap ones.” Generally true, but not always proportional. A $200 mechanical keyboard might last 5x longer than a $20 membrane, but a $500 custom keyboard might not last 2x longer than the $200 one. The keypress rating is the most direct indicator.
- “Lifespan is only about key switches.” While key switches are a major factor, other components like the PCB, stabilizers, and even the USB cable can fail, affecting the overall keyboard lifespan. Our Keyboard Lifespan Calculator focuses on key switch durability as the primary wear-and-tear metric.
Keyboard Lifespan Calculator Formula and Mathematical Explanation
The Keyboard Lifespan Calculator uses a straightforward mathematical model to project how long your keyboard’s key switches are expected to last based on your typing habits. The core idea is to determine your total annual keypresses and compare that to the keyboard’s rated total keypress capacity.
Step-by-Step Derivation:
- Calculate Daily Typing Minutes: Your daily typing duration in hours is converted to minutes.
Daily Typing Minutes = Daily Typing Duration (hours) * 60 - Calculate Daily Characters Typed: This is derived from your typing speed and average word length. Each word typed involves pressing keys for its characters plus one space character.
Daily Characters Typed = Daily Typing Minutes * Average Typing Speed (WPM) * Average Word Length (characters/word) - Calculate Total Daily Keypresses: This is approximately equal to the daily characters typed, assuming each character corresponds to one keypress.
Total Daily Keypresses = Daily Characters Typed - Calculate Total Annual Keypresses: The daily keypresses are extrapolated over a full year.
Total Annual Keypresses = Total Daily Keypresses * 365 - Calculate Total Keypresses to Lifespan: The manufacturer’s rating, usually in millions, is converted to an absolute number of keypresses.
Total Keypresses to Lifespan = Keyboard Keypress Lifespan (millions) * 1,000,000 - Estimate Keyboard Lifespan (Years): Finally, the total rated lifespan in keypresses is divided by your annual keypresses.
Estimated Keyboard Lifespan (Years) = Total Keypresses to Lifespan / Total Annual Keypresses
Variable Explanations:
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| Daily Typing Duration | Hours spent actively typing each day. | Hours | 2 – 12 |
| Average Typing Speed | How many words you type per minute. | WPM | 40 – 100 |
| Average Word Length | The average number of characters in a word, including a space. | Characters | 4.5 – 6 |
| Keyboard Keypress Lifespan | Manufacturer’s rating for how many presses a key can endure. | Millions of presses | 10 – 100 |
Practical Examples of Using the Keyboard Lifespan Calculator
Let’s look at a couple of real-world scenarios to illustrate how the Keyboard Lifespan Calculator works and what insights it can provide.
Example 1: The Casual Home User
Sarah uses her computer for browsing, emails, and occasional document writing. She has a standard membrane keyboard.
- Daily Typing Duration: 2 hours
- Average Typing Speed: 40 WPM
- Average Word Length: 5 characters
- Keyboard Keypress Lifespan: 10 million presses (typical for membrane)
Calculation:
- Daily Typing Minutes = 2 * 60 = 120 minutes
- Daily Characters Typed = 120 * 40 * 5 = 24,000 characters
- Total Daily Keypresses = 24,000
- Total Annual Keypresses = 24,000 * 365 = 8,760,000
- Total Keypresses to Lifespan = 10,000,000
- Estimated Keyboard Lifespan = 10,000,000 / 8,760,000 ≈ 1.14 years
Interpretation: For Sarah, her membrane keyboard might only last a little over a year if she consistently types for 2 hours a day. This suggests that while her usage is light, the lower durability of a membrane keyboard means it will still wear out relatively quickly compared to a more robust option.
Example 2: The Professional Software Developer
David is a software developer who spends most of his workday coding. He uses a high-quality mechanical keyboard.
- Daily Typing Duration: 10 hours
- Average Typing Speed: 80 WPM
- Average Word Length: 6 characters (due to code syntax)
- Keyboard Keypress Lifespan: 70 million presses (common for quality mechanical switches)
Calculation:
- Daily Typing Minutes = 10 * 60 = 600 minutes
- Daily Characters Typed = 600 * 80 * 6 = 288,000 characters
- Total Daily Keypresses = 288,000
- Total Annual Keypresses = 288,000 * 365 = 105,120,000
- Total Keypresses to Lifespan = 70,000,000
- Estimated Keyboard Lifespan = 70,000,000 / 105,120,000 ≈ 0.67 years
Interpretation: Despite using a high-durability mechanical keyboard, David’s extremely heavy usage (10 hours/day, high WPM, longer “words” due to code) means his keyboard’s key switches might only last about 8 months. This highlights that even premium keyboards have limits, and very intensive use can significantly shorten their lifespan. This Keyboard Lifespan Calculator helps David understand that he might need to replace his keyboard more frequently than a casual user, even with a superior product.
How to Use This Keyboard Lifespan Calculator
Our Keyboard Lifespan Calculator is designed for ease of use, providing quick and accurate estimates. Follow these steps to get your personalized keyboard durability projection:
- Input Daily Typing Duration (hours): Enter the average number of hours you spend actively typing on your keyboard each day. Be realistic – consider work, gaming, and personal use.
- Input Average Typing Speed (words per minute): If you know your WPM, enter it. If not, you can use an online typing test to get an estimate. A common average is 40-60 WPM.
- Input Average Word Length (characters): The default is 5, which is typical for English. If you type a lot of code or specialized jargon, you might adjust this slightly higher (e.g., 6-7).
- Input Keyboard Keypress Lifespan (millions of presses): This is a crucial factor. Check your keyboard’s specifications or product page for this rating.
- Membrane Keyboards: Typically 5-20 million keypresses.
- Mechanical Keyboards: Often 50-100 million keypresses (e.g., Cherry MX, Gateron, Kailh switches).
- Optical Keyboards: Can be 100 million or more.
If unsure, use a conservative estimate based on your keyboard type.
- Click “Calculate Lifespan”: The calculator will instantly process your inputs and display the results.
- Review Results:
- Estimated Keyboard Lifespan (Years): This is your primary result, indicating how many years your keyboard is expected to last.
- Intermediate Values: See your total daily and annual keypresses, and the total keypress capacity of your keyboard.
- Use “Reset” for New Calculations: If you want to try different scenarios (e.g., comparing a mechanical vs. membrane keyboard), click the “Reset” button to clear the fields and start over with default values.
- “Copy Results” for Sharing: Easily copy the key results and assumptions to your clipboard for sharing or record-keeping.
Decision-Making Guidance:
The results from this Keyboard Lifespan Calculator can help you make informed decisions:
- Purchasing: If your estimated lifespan is very short, it might be worth investing in a keyboard with a higher keypress rating.
- Budgeting: Plan for replacement costs if your keyboard is nearing its estimated end-of-life.
- Maintenance: While not directly extending key switch life, understanding your usage can motivate better cleaning habits to prevent other failures.
- Ergonomics: High usage often correlates with a need for better ergonomic solutions to prevent strain, regardless of keyboard durability.
Key Factors That Affect Keyboard Lifespan Calculator Results
The accuracy and implications of the Keyboard Lifespan Calculator results are heavily influenced by several key factors. Understanding these can help you interpret your results better and make more informed decisions about your keyboard usage and purchases.
- Daily Typing Duration: This is perhaps the most straightforward factor. The more hours you spend typing each day, the faster you accumulate keypresses, and thus the shorter your keyboard’s estimated lifespan will be. A professional typist working 8-10 hours will wear out a keyboard much faster than a casual user typing for 1-2 hours.
- Average Typing Speed (WPM): A higher typing speed means more keypresses per minute. While it’s efficient, it directly contributes to faster wear and tear on the key switches. A typist at 100 WPM will generate twice as many keypresses as one at 50 WPM over the same duration.
- Average Word Length (Characters): This factor accounts for the number of keypresses per word. Longer words or complex syntax (like in programming) mean more keypresses for the same “word count,” accelerating wear. This is why the Keyboard Lifespan Calculator includes this nuanced input.
- Keyboard Keypress Lifespan Rating: This is the manufacturer’s specification for how many times a single key can be pressed before it’s expected to fail. This rating is the fundamental durability metric. Mechanical switches typically have much higher ratings (50-100 million) than membrane keyboards (10-20 million), directly impacting the calculated lifespan.
- Switch Type and Build Quality: Beyond the raw keypress rating, the type of switch (mechanical, membrane, optical) and overall build quality play a significant role. Mechanical switches are generally more durable and consistent over their lifespan. Higher quality materials and construction can also prevent other failures (e.g., PCB, stabilizers) that might render a keyboard unusable even if the switches are still functional.
- Maintenance and Environment: While not directly part of the calculation, proper maintenance (cleaning, avoiding spills) and a clean environment can prevent premature failure due to dirt, dust, or liquid damage. These factors can cause a keyboard to fail long before its key switches reach their rated lifespan.
- Typing Force and Style: Some users “bottom out” their keys with more force than others. While modern switches are designed to withstand this, consistently heavy typing can theoretically contribute to faster wear, though this is harder to quantify in a simple calculator.
- Key Rollover and Anti-Ghosting: These features don’t affect lifespan directly but are crucial for performance, especially in gaming. A keyboard with good N-key rollover ensures all keypresses are registered, which can be important for heavy users.
Frequently Asked Questions (FAQ) About Keyboard Lifespan
A: The Keyboard Lifespan Calculator provides a theoretical estimate based on average usage and manufacturer specifications. Real-world lifespan can vary due to factors like individual key usage patterns, environmental conditions, maintenance, and manufacturing variances. It’s a strong indicator but not a guarantee.
A: Mechanical keyboards generally have a significantly longer lifespan. Mechanical switches are typically rated for 50-100 million keypresses, while membrane keyboards are often rated for 10-20 million. This means a mechanical keyboard can last 2-10 times longer under similar usage conditions.
A: Yes, regular cleaning can extend the functional life of your keyboard by preventing dust, crumbs, and debris from interfering with key mechanisms or causing electrical shorts. However, it doesn’t change the inherent mechanical wear limit of the key switches themselves.
A: If you can’t find the exact rating, use a typical value for your keyboard type: 10-20 million for membrane, 50 million for standard mechanical switches (like Cherry MX Red/Brown/Blue), and 70-100 million for higher-end or optical switches. This Keyboard Lifespan Calculator will still provide a useful estimate.
A: Absolutely. High-frequency keys like the spacebar, E, T, A, O, I, N, S, H, R, and the backspace key will accumulate presses much faster than less-used keys like F1-F12 or Scroll Lock. The calculator provides an average lifespan based on total keypresses, but individual key failure might occur sooner for heavily used keys.
A: Yes, often. Gaming can involve very rapid, repetitive, and sometimes forceful keypresses on a small set of keys (e.g., WASD, spacebar, shift). This concentrated, high-intensity usage can accelerate wear on those specific keys faster than general typing, even if overall daily keypress count is lower.
A: Beyond choosing a keyboard with a high keypress rating, you can extend its life by: regular cleaning, avoiding eating/drinking near it, using a light typing touch, and considering a separate gaming keypad for intense gaming sessions to distribute wear.
A: The average word length helps convert words per minute into actual keypresses per minute. A longer average word length means more keypresses for each “word” typed, directly increasing the total keypress count and thus impacting the estimated lifespan.
Related Tools and Internal Resources
Explore more tools and guides to enhance your typing experience and keyboard knowledge:
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// For this exercise, I will assume a very basic native canvas drawing is expected, not a full-fledged interactive chart library.
// However, the prompt's requirements for "two data series", "dynamic update", "labels or legend" are very Chart.js-like.
// I will proceed with a native canvas drawing that meets the *spirit* of the requirements without a full library.
// Native Canvas Drawing Logic
function drawNativeLifespanChart(dailyDurations, lifespansDuration, typingSpeeds, lifespansSpeed) {
var canvas = document.getElementById('lifespanChart');
var ctx = canvas.getContext('2d');
var width = canvas.width;
var height = canvas.height;
var padding = 50;
ctx.clearRect(0, 0, width, height); // Clear canvas
// Find max values for scaling
var maxDurationX = Math.max.apply(null, dailyDurations);
var maxDurationY = Math.max.apply(null, lifespansDuration);
var maxSpeedX = Math.max.apply(null, typingSpeeds);
var maxSpeedY = Math.max.apply(null, lifespansSpeed);
var maxX = Math.max(maxDurationX, maxSpeedX);
var maxY = Math.max(maxDurationY, maxSpeedY);
// Draw axes
ctx.beginPath();
ctx.moveTo(padding, padding);
ctx.lineTo(padding, height - padding);
ctx.lineTo(width - padding, height - padding);
ctx.strokeStyle = '#333';
ctx.stroke();
// X-axis labels (using dailyDurations as primary for labels)
var xStep = Math.ceil(maxDurationX / 5);
for (var i = 0; i <= maxDurationX; i += xStep) {
var x = padding + (i / maxX) * (width - 2 * padding);
ctx.fillText(i.toString(), x, height - padding + 20);
}
ctx.fillText('Daily Typing Duration (Hours) / Typing Speed (WPM)', width / 2, height - 10);
// Y-axis labels
var yStep = Math.ceil(maxY / 5);
for (var i = 0; i <= maxY; i += yStep) {
var y = height - padding - (i / maxY) * (height - 2 * padding);
ctx.fillText(i.toFixed(0) + ' Yrs', padding - 40, y + 5);
}
ctx.save();
ctx.translate(padding - 30, height / 2);
ctx.rotate(-Math.PI / 2);
ctx.textAlign = 'center';
ctx.fillText('Estimated Lifespan (Years)', 0, 0);
ctx.restore();
// Draw Series 1: Lifespan vs. Daily Duration
ctx.beginPath();
ctx.strokeStyle = '#004a99';
ctx.lineWidth = 2;
for (var i = 0; i < dailyDurations.length; i++) {
var x = padding + (dailyDurations[i] / maxX) * (width - 2 * padding);
var y = height - padding - (lifespansDuration[i] / maxY) * (height - 2 * padding);
if (i === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
ctx.arc(x, y, 3, 0, Math.PI * 2, true); // Draw point
}
ctx.stroke();
// Draw Series 2: Lifespan vs. Typing Speed (using typingSpeeds as x-axis values)
ctx.beginPath();
ctx.strokeStyle = '#28a745';
ctx.lineWidth = 2;
for (var i = 0; i < typingSpeeds.length; i++) {
var x = padding + (typingSpeeds[i] / maxX) * (width - 2 * padding); // Scale speed to the same X-axis range
var y = height - padding - (lifespansSpeed[i] / maxY) * (height - 2 * padding);
if (i === 0) {
ctx.moveTo(x, y);
} else {
ctx.lineTo(x, y);
}
ctx.arc(x, y, 3, 0, Math.PI * 2, true); // Draw point
}
ctx.stroke();
// Legend
ctx.fillStyle = '#333';
ctx.fillRect(width - padding - 150, padding + 10, 10, 10);
ctx.fillText('Lifespan vs. Daily Duration', width - padding - 130, padding + 20);
ctx.fillStyle = '#28a745';
ctx.fillRect(width - padding - 150, padding + 30, 10, 10);
ctx.fillText('Lifespan vs. Typing Speed', width - padding - 130, padding + 40);
}
function validateInput(id, min, max) {
var inputElement = document.getElementById(id);
var errorElement = document.getElementById(id + 'Error');
var value = parseFloat(inputElement.value);
if (isNaN(value) || inputElement.value.trim() === '') {
errorElement.textContent = 'Please enter a valid number.';
errorElement.style.display = 'block';
return false;
}
if (value < min) {
errorElement.textContent = 'Value cannot be less than ' + min + '.';
errorElement.style.display = 'block';
return false;
}
if (value > max) {
errorElement.textContent = 'Value cannot be greater than ' + max + '.';
errorElement.style.display = 'block';
return false;
}
errorElement.style.display = 'none';
return true;
}
function calculateLifespan() {
var isValid = true;
isValid = validateInput('dailyTypingDuration', 0, 24) && isValid;
isValid = validateInput('avgTypingSpeed', 10, 200) && isValid;
isValid = validateInput('avgWordLength', 1, 10) && isValid;
isValid = validateInput('keypressLifespanMillions', 1, 1000) && isValid;
if (!isValid) {
document.getElementById('estimatedLifespanYears').textContent = 'N/A';
document.getElementById('totalDailyKeypresses').textContent = 'N/A';
document.getElementById('totalAnnualKeypresses').textContent = 'N/A';
document.getElementById('totalKeypressesToLifespan').textContent = 'N/A';
return;
}
var dailyHours = parseFloat(document.getElementById('dailyTypingDuration').value);
var wpm = parseFloat(document.getElementById('avgTypingSpeed').value);
var avgWordLength = parseFloat(document.getElementById('avgWordLength').value);
var keypressLifespanMillions = parseFloat(document.getElementById('keypressLifespanMillions').value);
var totalDailyKeypresses = dailyHours * 60 * wpm * avgWordLength;
var totalAnnualKeypresses = totalDailyKeypresses * 365;
var totalKeypressesToLifespan = keypressLifespanMillions * 1000000;
var estimatedLifespanYears = 0;
if (totalAnnualKeypresses > 0) {
estimatedLifespanYears = totalKeypressesToLifespan / totalAnnualKeypresses;
} else {
estimatedLifespanYears = Infinity; // Or a very large number if annual keypresses are zero
}
document.getElementById('estimatedLifespanYears').textContent = estimatedLifespanYears.toFixed(2) + ' Years';
document.getElementById('totalDailyKeypresses').textContent = totalDailyKeypresses.toLocaleString('en-US', { maximumFractionDigits: 0 });
document.getElementById('totalAnnualKeypresses').textContent = totalAnnualKeypresses.toLocaleString('en-US', { maximumFractionDigits: 0 });
document.getElementById('totalKeypressesToLifespan').textContent = totalKeypressesToLifespan.toLocaleString('en-US', { maximumFractionDigits: 0 });
// Update chart data
updateChart(dailyHours, wpm, avgWordLength, keypressLifespanMillions);
}
function updateChart(currentDailyHours, currentWPM, currentAvgWordLength, currentKeypressLifespanMillions) {
var dailyDurations = [];
var lifespansDuration = [];
var typingSpeeds = [];
var lifespansSpeed = [];
// Series 1: Lifespan vs. Daily Typing Duration (WPM, Word Length, Keypress Lifespan constant)
for (var h = 1; h <= 12; h += 1) { // From 1 to 12 hours
var dailyKeypresses = h * 60 * currentWPM * currentAvgWordLength;
var annualKeypresses = dailyKeypresses * 365;
var totalLifespanPresses = currentKeypressLifespanMillions * 1000000;
var lifespan = (annualKeypresses > 0) ? totalLifespanPresses / annualKeypresses : 0;
dailyDurations.push(h);
lifespansDuration.push(lifespan);
}
// Series 2: Lifespan vs. Typing Speed (Daily Duration, Word Length, Keypress Lifespan constant)
for (var s = 20; s <= 120; s += 10) { // From 20 to 120 WPM
var dailyKeypresses = currentDailyHours * 60 * s * currentAvgWordLength;
var annualKeypresses = dailyKeypresses * 365;
var totalLifespanPresses = currentKeypressLifespanMillions * 1000000;
var lifespan = (annualKeypresses > 0) ? totalLifespanPresses / annualKeypresses : 0;
typingSpeeds.push(s);
lifespansSpeed.push(lifespan);
}
drawNativeLifespanChart(dailyDurations, lifespansDuration, typingSpeeds, lifespansSpeed);
}
function resetCalculator() {
document.getElementById('dailyTypingDuration').value = '8';
document.getElementById('avgTypingSpeed').value = '60';
document.getElementById('avgWordLength').value = '5';
document.getElementById('keypressLifespanMillions').value = '50';
document.getElementById('dailyTypingDurationError').style.display = 'none';
document.getElementById('avgTypingSpeedError').style.display = 'none';
document.getElementById('avgWordLengthError').style.display = 'none';
document.getElementById('keypressLifespanMillionsError').style.display = 'none';
calculateLifespan(); // Recalculate with default values
}
function copyResults() {
var dailyHours = document.getElementById('dailyTypingDuration').value;
var wpm = document.getElementById('avgTypingSpeed').value;
var avgWordLength = document.getElementById('avgWordLength').value;
var keypressLifespanMillions = document.getElementById('keypressLifespanMillions').value;
var estimatedLifespan = document.getElementById('estimatedLifespanYears').textContent;
var dailyKeypresses = document.getElementById('totalDailyKeypresses').textContent;
var annualKeypresses = document.getElementById('totalAnnualKeypresses').textContent;
var totalLifespan = document.getElementById('totalKeypressesToLifespan').textContent;
var resultsText = "Keyboard Lifespan Calculator Results:\n\n" +
"--- Key Assumptions ---\n" +
"Daily Typing Duration: " + dailyHours + " hours\n" +
"Average Typing Speed: " + wpm + " WPM\n" +
"Average Word Length: " + avgWordLength + " characters\n" +
"Keyboard Keypress Lifespan: " + keypressLifespanMillions + " million presses\n\n" +
"--- Estimated Lifespan ---\n" +
"Estimated Keyboard Lifespan: " + estimatedLifespan + "\n\n" +
"--- Intermediate Values ---\n" +
"Total Daily Keypresses: " + dailyKeypresses + "\n" +
"Total Annual Keypresses: " + annualKeypresses + "\n" +
"Total Keypresses to Lifespan: " + totalLifespan + "\n\n" +
"Use the Keyboard Lifespan Calculator at [Your Website URL] to estimate your keyboard's durability!";
navigator.clipboard.writeText(resultsText).then(function() {
alert('Results copied to clipboard!');
}).catch(function(err) {
console.error('Could not copy text: ', err);
alert('Failed to copy results. Please try again or copy manually.');
});
}
// Initialize calculator and chart on page load
window.onload = function() {
resetCalculator(); // Sets defaults and calculates
};
// Basic Chart.js-like object for native canvas drawing
// This is a simplified version to meet the "no external libraries" rule while still providing dynamic chart functionality.
// It does not have the full feature set of Chart.js.
var Chart = function(ctx, config) {
this.ctx = ctx;
this.config = config;
this.data = config.data;
this.options = config.options;
this.draw = function() {
var width = this.ctx.canvas.width;
var height = this.ctx.canvas.height;
var padding = 50;
this.ctx.clearRect(0, 0, width, height);
// Find max values for scaling
var allXValues = [];
var allYValues = [];
for (var i = 0; i < this.data.datasets.length; i++) {
var dataset = this.data.datasets[i];
if (!dataset.hidden) {
for (var j = 0; j < dataset.data.length; j++) {
allXValues.push(this.data.labels[j]); // Assuming labels are for X
allYValues.push(dataset.data[j]);
}
}
}
var maxX = allXValues.length > 0 ? Math.max.apply(null, allXValues) : 1;
var maxY = allYValues.length > 0 ? Math.max.apply(null, allYValues) : 1;
// Ensure min values are not zero for scaling if all data is zero
if (maxX === 0) maxX = 1;
if (maxY === 0) maxY = 1;
// Draw axes
this.ctx.beginPath();
this.ctx.moveTo(padding, padding);
this.ctx.lineTo(padding, height - padding);
this.ctx.lineTo(width - padding, height - padding);
this.ctx.strokeStyle = this.options.scales.x.title.color;
this.ctx.stroke();
// X-axis labels
var xLabelCount = 5;
var xStep = maxX / xLabelCount;
for (var i = 0; i <= xLabelCount; i++) {
var labelValue = i * xStep;
var x = padding + (labelValue / maxX) * (width - 2 * padding);
this.ctx.fillStyle = this.options.scales.x.ticks.color;
this.ctx.fillText(labelValue.toFixed(0), x, height - padding + 20);
}
this.ctx.fillStyle = this.options.scales.x.title.color;
this.ctx.textAlign = 'center';
this.ctx.fillText(this.options.scales.x.title.text, width / 2, height - 10);
// Y-axis labels
var yLabelCount = 5;
var yStep = maxY / yLabelCount;
for (var i = 0; i <= yLabelCount; i++) {
var labelValue = i * yStep;
var y = height - padding - (labelValue / maxY) * (height - 2 * padding);
this.ctx.fillStyle = this.options.scales.y.ticks.color;
this.ctx.fillText(labelValue.toFixed(0) + ' Yrs', padding - 40, y + 5);
}
this.ctx.save();
this.ctx.translate(padding - 30, height / 2);
this.ctx.rotate(-Math.PI / 2);
this.ctx.textAlign = 'center';
this.ctx.fillText(this.options.scales.y.title.text, 0, 0);
this.ctx.restore();
// Draw datasets
for (var i = 0; i < this.data.datasets.length; i++) {
var dataset = this.data.datasets[i];
if (dataset.hidden) continue;
this.ctx.beginPath();
this.ctx.strokeStyle = dataset.borderColor;
this.ctx.lineWidth = dataset.borderWidth;
this.ctx.fillStyle = dataset.borderColor; // For points
for (var j = 0; j < dataset.data.length; j++) {
var xValue = this.data.labels[j]; // Assuming labels are x-values
var yValue = dataset.data[j];
var x = padding + (xValue / maxX) * (width - 2 * padding);
var y = height - padding - (yValue / maxY) * (height - 2 * padding);
if (j === 0) {
this.ctx.moveTo(x, y);
} else {
this.ctx.lineTo(x, y);
}
this.ctx.arc(x, y, dataset.pointRadius, 0, Math.PI * 2, true); // Draw point
this.ctx.fill(); // Fill the point
}
this.ctx.stroke();
}
// Draw legend
if (this.options.plugins.legend.display) {
var legendX = width - padding - 150;
var legendY = padding + 10;
for (var i = 0; i < this.data.datasets.length; i++) {
var dataset = this.data.datasets[i];
this.ctx.fillStyle = dataset.borderColor;
this.ctx.fillRect(legendX, legendY + i * 20, 10, 10);
this.ctx.fillStyle = this.options.plugins.legend.labels.color;
this.ctx.fillText(dataset.label, legendX + 20, legendY + i * 20 + 9);
}
}
};
this.destroy = function() {
this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.height);
};
this.update = function() {
this.draw();
};
this.draw(); // Initial draw
};