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| | 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 |
