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| 1 | +<!DOCTYPE html> |
| 2 | +<html lang="en"> |
| 3 | +<head> |
| 4 | + <meta charset="UTF-8"> |
| 5 | + <title>HTML5 Canvas</title> |
| 6 | +</head> |
| 7 | +<body> |
| 8 | +<canvas id="draw" width="800" height="800"></canvas> |
| 9 | +<script> |
| 10 | + const canvas = document.querySelector('#draw'); |
| 11 | + const ctx = canvas.getContext('2d'); |
| 12 | + |
| 13 | + canvas.width = window.innerWidth; |
| 14 | + canvas.height = window.innerHeight; |
| 15 | + |
| 16 | + let isDrawing = false; |
| 17 | + let lastX = 0; |
| 18 | + let lastY = 0; |
| 19 | + |
| 20 | + ctx.lineWidth = 90; |
| 21 | + ctx.lineCap = "round"; |
| 22 | + ctx.lineJoin = "round"; |
| 23 | + ctx.strokeStyle = "#f00"; |
| 24 | + ctx.fillStyle = "#f00"; |
| 25 | + |
| 26 | + let hue = 0; |
| 27 | + let direction = true; |
| 28 | + let x = 0; |
| 29 | + let y = 0; |
| 30 | + |
| 31 | + function draw(e) { |
| 32 | +// console.log(method); |
| 33 | + if(!isDrawing) return; |
| 34 | + |
| 35 | + if(e.type == "mousemove"){ |
| 36 | + x = e.offsetX; |
| 37 | + y = e.offsetY; |
| 38 | + } else { |
| 39 | + x = e.changedTouches[0].clientX; |
| 40 | + y = e.changedTouches[0].clientY; |
| 41 | + console.log(e); |
| 42 | + } |
| 43 | +// console.log(e.type); |
| 44 | + ctx.strokeStyle = `hsl(${ hue }, 80%, 50%)`; |
| 45 | + if(hue >= 360) hue = 0; |
| 46 | + hue++; |
| 47 | + |
| 48 | + if(ctx.lineWidth > 120 || ctx.lineWidth < 10) { |
| 49 | + direction = !direction; |
| 50 | + } |
| 51 | + if (direction) { |
| 52 | + ctx.lineWidth++; |
| 53 | + } else { |
| 54 | + ctx.lineWidth--; |
| 55 | + } |
| 56 | + |
| 57 | + ctx.beginPath(); |
| 58 | + lastX = x; |
| 59 | + lastY = y; |
| 60 | + ctx.moveTo(lastX, lastY); |
| 61 | + ctx.lineTo(x, y); |
| 62 | + ctx.stroke(); |
| 63 | +// lastX = e.offsetX; |
| 64 | +// lastY = e.offsetY; |
| 65 | +// console.log(ctx.lineWidth); |
| 66 | +// console.log(x +"-" + e.offsetX); |
| 67 | + } |
| 68 | + |
| 69 | + function drawTouch(e) { |
| 70 | + if(!isDrawing) return; |
| 71 | + ctx.beginPath(); |
| 72 | + lastX = e.changedTouches[0].clientX; |
| 73 | + lastY = e.changedTouches[0].clientY; |
| 74 | + ctx.moveTo(lastX, lastY); |
| 75 | + ctx.lineTo(e.changedTouches[0].clientX, e.changedTouches[0].clientY); |
| 76 | + ctx.stroke(); |
| 77 | +// lastX = e.offsetX; |
| 78 | +// lastY = e.offsetY; |
| 79 | + console.log(); |
| 80 | + } |
| 81 | + |
| 82 | + canvas.addEventListener('mousemove', draw); |
| 83 | + canvas.addEventListener('mousedown', () => isDrawing = true); |
| 84 | + canvas.addEventListener('mouseup', () => isDrawing = false); |
| 85 | + canvas.addEventListener('mouseout', () => isDrawing = false); |
| 86 | + |
| 87 | + canvas.addEventListener('touchmove', draw); |
| 88 | + canvas.addEventListener('touchstart', () => isDrawing = true); |
| 89 | + canvas.addEventListener('touchend', () => isDrawing = false); |
| 90 | + canvas.addEventListener('touchcancel', () => isDrawing = false); |
| 91 | +</script> |
| 92 | + |
| 93 | +<style> |
| 94 | + html, body { |
| 95 | + margin:0; |
| 96 | + } |
| 97 | +</style> |
| 98 | + |
| 99 | +</body> |
| 100 | +</html> |
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