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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| canvas { | |
| border: 1px solid black; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas height="400" id="magicWheel" width="400"></canvas> | |
| <button onclick="spinWheel()">Spin</button> | |
| <script> | |
| const canvas = document.getElementById("magicWheel"); | |
| const ctx = canvas.getContext("2d"); | |
| const centerX = canvas.width / 2; | |
| const centerY = canvas.height / 2; | |
| const radius = 150; | |
| const sectorColors = [ | |
| "red", | |
| "blue", | |
| "green", | |
| "yellow", | |
| "purple", | |
| "orange", | |
| ]; | |
| const sectorLabels = ["A", "B", "C", "D", "E", "F"]; | |
| function generateRandomAngles(numSectors) { | |
| const minAngle = (2 * Math.PI) / 32; | |
| const angles = []; | |
| let totalAngle = 0; | |
| for (let i = 0; i < numSectors; i++) { | |
| const randomAngle = | |
| minAngle + | |
| Math.random() * ((2 * Math.PI) / numSectors - minAngle); | |
| totalAngle += randomAngle; | |
| angles.push(totalAngle); | |
| } | |
| const scaleFactor = (2 * Math.PI) / totalAngle; | |
| return angles.map((angle) => angle * scaleFactor); | |
| } | |
| const sectorAngles = generateRandomAngles(sectorColors.length); | |
| function drawSector(startAngle, endAngle, color) { | |
| ctx.beginPath(); | |
| ctx.moveTo(centerX, centerY); | |
| ctx.arc(centerX, centerY, radius, startAngle, endAngle); | |
| ctx.closePath(); | |
| ctx.fillStyle = color; | |
| ctx.fill(); | |
| } | |
| function drawPointer() { | |
| ctx.beginPath(); | |
| ctx.moveTo(centerX, centerY - radius - 20); | |
| ctx.lineTo(centerX - 10, centerY - radius + 10); | |
| ctx.lineTo(centerX + 10, centerY - radius + 10); | |
| ctx.closePath(); | |
| ctx.fillStyle = "black"; | |
| ctx.fill(); | |
| } | |
| function drawWheel() { | |
| const numSectors = sectorColors.length; | |
| for (let i = 0; i < numSectors; i++) { | |
| const startAngle = sectorAngles[i]; | |
| const endAngle = sectorAngles[(i + 1) % numSectors]; | |
| const color = sectorColors[i]; | |
| drawSector(startAngle, endAngle, color); | |
| } | |
| } | |
| function spinWheel() { | |
| const spinTime = 5000; | |
| const minRotations = 5; | |
| const rotations = minRotations + Math.random() * 5; | |
| const randomStopAngle = Math.random() * 2 * Math.PI; | |
| const angle = 2 * Math.PI * rotations + randomStopAngle; | |
| let start = null; | |
| function animate(timestamp) { | |
| if (!start) { | |
| start = timestamp; | |
| } | |
| const progress = timestamp - start; | |
| const currentAngle = (angle * progress) / spinTime; | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| ctx.save(); | |
| ctx.translate(centerX, centerY); | |
| ctx.rotate(currentAngle); | |
| ctx.translate(-centerX, -centerY); | |
| drawWheel(); | |
| ctx.restore(); | |
| drawPointer(); | |
| if (progress < spinTime) { | |
| requestAnimationFrame(animate); | |
| } else { | |
| const finalAngle = angle % (2 * Math.PI); | |
| const winningSectorIndex = sectorAngles.findIndex( | |
| (a) => finalAngle <= a | |
| ); | |
| console.log( | |
| `Winning sector: ${sectorLabels[winningSectorIndex]}` | |
| ); | |
| } | |
| } | |
| requestAnimationFrame(animate); | |
| } | |
| drawWheel(); | |
| drawPointer(); | |
| </script> | |
| </body> | |
| </html> |
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