| 1 | // Main canvas setup |
| 2 | const canvas = document.getElementById('board') |
| 3 | const ctx = canvas.getContext('2d') |
| 4 | const chars = [ |
| 5 | '@', '#', '$', '%', '&', '*', '+', '=', |
| 6 | '~', '?', 'Ω', '∞', '¶', '§', '★', '☆' |
| 7 | ] |
| 8 | let drawing = false |
| 9 | let currentColor = '#0f0' |
| 10 | |
| 11 | // Color wheel setup |
| 12 | const colorWheel = document.getElementById('colorWheel') |
| 13 | const colorCtx = colorWheel.getContext('2d') |
| 14 | const colorPreview = document.getElementById('colorPreview') |
| 15 | colorWheel.width = 150 |
| 16 | colorWheel.height = 150 |
| 17 | |
| 18 | // Draw color wheel |
| 19 | function drawColorWheel() { |
| 20 | const centerX = colorWheel.width / 2 |
| 21 | const centerY = colorWheel.height / 2 |
| 22 | const radius = Math.min(centerX, centerY) - 2 |
| 23 | |
| 24 | for (let angle = 0; angle < 360; angle++) { |
| 25 | const startAngle = (angle - 1) * Math.PI / 180 |
| 26 | const endAngle = angle * Math.PI / 180 |
| 27 | |
| 28 | colorCtx.beginPath() |
| 29 | colorCtx.moveTo(centerX, centerY) |
| 30 | colorCtx.arc(centerX, centerY, radius, startAngle, endAngle) |
| 31 | colorCtx.closePath() |
| 32 | |
| 33 | const gradient = colorCtx.createRadialGradient(centerX, centerY, 0, centerX, centerY, radius) |
| 34 | gradient.addColorStop(0, 'white') |
| 35 | gradient.addColorStop(0.7, `hsl(${angle}, 100%, 50%)`) |
| 36 | gradient.addColorStop(1, `hsl(${angle}, 100%, 25%)`) |
| 37 | |
| 38 | colorCtx.fillStyle = gradient |
| 39 | colorCtx.fill() |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | // Get color from wheel position |
| 44 | function getColorFromWheel(x, y) { |
| 45 | const centerX = colorWheel.width / 2 |
| 46 | const centerY = colorWheel.height / 2 |
| 47 | const dx = x - centerX |
| 48 | const dy = y - centerY |
| 49 | const distance = Math.sqrt(dx * dx + dy * dy) |
| 50 | const maxRadius = Math.min(centerX, centerY) - 2 |
| 51 | |
| 52 | if (distance > maxRadius) return null |
| 53 | |
| 54 | let angle = Math.atan2(dy, dx) * 180 / Math.PI |
| 55 | angle = (angle + 360) % 360 |
| 56 | |
| 57 | const saturation = Math.min(100, (distance / maxRadius) * 100) |
| 58 | const lightness = 50 - (distance / maxRadius) * 25 |
| 59 | |
| 60 | return `hsl(${angle}, ${saturation}%, ${lightness}%)` |
| 61 | } |
| 62 | |
| 63 | // Color wheel interaction |
| 64 | colorWheel.addEventListener('click', (e) => { |
| 65 | const rect = colorWheel.getBoundingClientRect() |
| 66 | const x = e.clientX - rect.left |
| 67 | const y = e.clientY - rect.top |
| 68 | const color = getColorFromWheel(x, y) |
| 69 | |
| 70 | if (color) { |
| 71 | currentColor = color |
| 72 | colorPreview.style.backgroundColor = color |
| 73 | } |
| 74 | }) |
| 75 | |
| 76 | // Drawing functions |
| 77 | function randomChar() { |
| 78 | return chars[Math.floor(Math.random() * chars.length)] |
| 79 | } |
| 80 | |
| 81 | function getFont() { |
| 82 | return `${sizeInput.value}px monospace` |
| 83 | } |
| 84 | |
| 85 | function draw(e) { |
| 86 | if (!drawing) return |
| 87 | const rect = canvas.getBoundingClientRect() |
| 88 | const x = e.clientX - rect.left |
| 89 | const y = e.clientY - rect.top |
| 90 | ctx.font = getFont() |
| 91 | ctx.fillStyle = currentColor |
| 92 | ctx.fillText(randomChar(), x, y) |
| 93 | } |
| 94 | |
| 95 | // Mouse events |
| 96 | canvas.addEventListener('mousedown', () => (drawing = true)) |
| 97 | canvas.addEventListener('mouseup', () => (drawing = false)) |
| 98 | canvas.addEventListener('mouseleave', () => (drawing = false)) |
| 99 | canvas.addEventListener('mousemove', draw) |
| 100 | |
| 101 | // Touch support |
| 102 | canvas.addEventListener('touchstart', e => { |
| 103 | drawing = true |
| 104 | draw(e.touches[0]) |
| 105 | }) |
| 106 | canvas.addEventListener('touchmove', e => { |
| 107 | draw(e.touches[0]) |
| 108 | e.preventDefault() |
| 109 | }) |
| 110 | canvas.addEventListener('touchend', () => (drawing = false)) |
| 111 | |
| 112 | // Controls |
| 113 | const clearBtn = document.getElementById('clear') |
| 114 | clearBtn.onclick = () => ctx.clearRect(0, 0, canvas.width, canvas.height) |
| 115 | |
| 116 | const sizeInput = document.getElementById('size') |
| 117 | |
| 118 | // Initialize |
| 119 | drawColorWheel() |
| 120 | colorPreview.style.backgroundColor = currentColor |