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pie chart on js canvas. no libs
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Pie Chart</title> | |
| </head> | |
| <body> | |
| <div class="chart-container"> | |
| <canvas id="myCanvas" width="300" height="300"></canvas> | |
| <div class="input-container"> | |
| <div class="input-row"> | |
| <label for="dataInput1"><span class="color-box" style="background-color: #FF6384;"></span></label> | |
| <input type="range" id="dataInput1" min="0" max="100" value="25"> | |
| </div> | |
| <div class="input-row"> | |
| <label for="dataInput2"><span class="color-box" style="background-color: #36A2EB;"></span></label> | |
| <input type="range" id="dataInput2" min="0" max="100" value="35"> | |
| </div> | |
| <div class="input-row"> | |
| <label for="dataInput3"><span class="color-box" style="background-color: #FFCE56;"></span></label> | |
| <input type="range" id="dataInput3" min="0" max="100" value="20"> | |
| </div> | |
| <div class="input-row"> | |
| <label for="dataInput4"><span class="color-box" style="background-color: #4BC0C0;"></span></label> | |
| <input type="range" id="dataInput4" min="0" max="100" value="10"> | |
| </div> | |
| <div class="input-row"> | |
| <label for="dataInput5"><span class="color-box" style="background-color: #9966FF;"></span></label> | |
| <input type="range" id="dataInput5" min="0" max="100" value="10"> | |
| </div> | |
| </div> | |
| </div> | |
| <link rel="stylesheet" href="style.css"> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| var canvas = document.getElementById("myCanvas") | |
| var ctx = canvas.getContext("2d") | |
| var data = [25, 35, 20, 10, 10] | |
| var colors = ["#FF6384", "#36A2EB", "#FFCE56", "#4BC0C0", "#9966FF"] | |
| var centerX = canvas.width / 2 | |
| var centerY = canvas.height / 2 | |
| var radius = Math.min(centerX, centerY) | |
| drawChart() | |
| var inputs = document.querySelectorAll("input[type='range']") | |
| inputs.forEach((input, index) => { | |
| input.addEventListener("input", () => { | |
| updateData(input, index) | |
| }) | |
| }) | |
| function updateData(input, index) { | |
| data[index] = Number(input.value) | |
| drawChart() | |
| } | |
| function drawChart() { | |
| ctx.clearRect(0, 0, canvas.width, canvas.height) | |
| var total = data.reduce((sum, value) => sum + value, 0) | |
| var startAngle = 0 | |
| for (var i = 0; i < data.length; i++) { | |
| var angle = (data[i] / total) * Math.PI * 2 | |
| ctx.fillStyle = colors[i] | |
| ctx.beginPath() | |
| ctx.moveTo(centerX, centerY) | |
| ctx.arc(centerX, centerY, radius, startAngle, startAngle + angle) | |
| ctx.closePath() | |
| ctx.fill() | |
| ctx.fillStyle = "#fff" | |
| ctx.font = "14px Arial" | |
| var textAngle = startAngle + angle / 2 | |
| var x = centerX + (radius / 2) * Math.cos(textAngle) | |
| var y = centerY + (radius / 2) * Math.sin(textAngle) | |
| var percent = ((data[i] / total) * 100).toFixed(0) | |
| if (percent > 0) { | |
| ctx.fillText(`${percent}%`, x, y) | |
| } | |
| startAngle += angle | |
| } | |
| } |
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| .chart-container { | |
| display: flex; | |
| flex-direction: column; | |
| align-items: center; | |
| } | |
| .input-container { | |
| display: flex; | |
| flex-direction: column; | |
| align-items: center; | |
| } | |
| .input-row { | |
| display: flex; | |
| flex-direction: row; | |
| align-items: center; | |
| margin-top: 10px; | |
| } | |
| .color-box { | |
| display: inline-block; | |
| width: 20px; | |
| height: 20px; | |
| margin-right: 10px; | |
| border-radius: 50%; | |
| } |
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