Created
July 11, 2018 03:50
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Procedurally generated cursor // source https://jsbin.com/huhomen
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Procedurally generated cursor</title> | |
<style> | |
td:first-child, td:last-child { | |
text-align: right; | |
} | |
td:last-child { | |
font-family: monospace; | |
width: 3em; | |
} | |
#cursorRender { | |
image-rendering: pixelated; | |
border: 1px solid red; | |
} | |
.test { | |
border: 1px solid blue; | |
width: 75vh; | |
height: 10em; | |
padding: 1em; | |
overflow: auto; | |
display: flex; | |
align-items: center; | |
justify-content: center; | |
} | |
.testArea { | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="cursorRender" width="128" height="256"></canvas> | |
<form> | |
<table> | |
<tbody> | |
<tr> | |
<td><strong>Rotation</strong></td> | |
<td><input type="range" min="0" max="360" id="rotation" value="0"></td> | |
<td id="rotationDisplay">0°</td> | |
</tr> | |
</tbody> | |
</table> | |
<div class="test"> | |
<div class="testArea" id="testArea" contenteditable="true"> | |
Test | |
</div> | |
</div> | |
</form> | |
<script> | |
let canvas = document.getElementById("cursorRender"); | |
let context = canvas.getContext("2d"); | |
let scale = 2; | |
let rotation = 0; | |
let gWidth = 21; | |
let gHeight = 20; | |
let roundRect = (ctx, x, y, width, height, radius, fill, stroke) => { | |
if (typeof stroke == 'undefined') { | |
stroke = true; | |
} | |
if (typeof radius === 'undefined') { | |
radius = 5; | |
} | |
if (typeof radius === 'number') { | |
radius = {tl: radius, tr: radius, br: radius, bl: radius}; | |
} else { | |
var defaultRadius = {tl: 0, tr: 0, br: 0, bl: 0}; | |
for (var side in defaultRadius) { | |
radius[side] = radius[side] || defaultRadius[side]; | |
} | |
} | |
ctx.beginPath(); | |
ctx.moveTo(x + radius.tl, y); | |
ctx.lineTo(x + width - radius.tr, y); | |
ctx.quadraticCurveTo(x + width, y, x + width, y + radius.tr); | |
ctx.lineTo(x + width, y + height - radius.br); | |
ctx.quadraticCurveTo(x + width, y + height, x + width - radius.br, y + height); | |
ctx.lineTo(x + radius.bl, y + height); | |
ctx.quadraticCurveTo(x, y + height, x, y + height - radius.bl); | |
ctx.lineTo(x, y + radius.tl); | |
ctx.quadraticCurveTo(x, y, x + radius.tl, y); | |
ctx.closePath(); | |
if (fill) { | |
ctx.fill(); | |
} | |
if (stroke) { | |
ctx.stroke(); | |
} | |
}; | |
let renderCursor = (angle, context, scaleFrom16) => { | |
const s = scaleFrom16; | |
const o = s * 2; | |
context.fillStyle = "rgb(0,0,0)"; | |
context.strokeStyle = "black"; | |
context.lineWidth = s * 1; | |
roundRect(context, s * -8, o * -3.25, s * 8, s * 13, {tl: 0, tr: s * 2, bl: 0, br: s * 2}, false, true); | |
roundRect(context, 0, o * -3.25, s * 8, s * 13, {tl: s * 2, tr: 0, bl: s * 2, br: 0}, false, true); | |
context.moveTo(s * -2.5, s * 0.5); | |
context.lineTo(s * 2.5, s * 0.5); | |
context.stroke(); | |
context.clearRect(s*-9.5, -canvas.height, s * 5, canvas.height*2); | |
context.clearRect(s *4.5, -canvas.height, s * 5, canvas.height*2); | |
}; | |
canvas.width = scale * gWidth; | |
canvas.height = scale * gHeight; | |
let renderEverything = () => { | |
let widthPixels = [...Array(canvas.width / scale).keys()]; | |
let heightPixels = [...Array(canvas.height / scale).keys()]; | |
context.clearRect(-canvas.width, -canvas.height, canvas.width*2, canvas.height*2); | |
context.resetTransform(); | |
context.translate(canvas.width / 2, canvas.height / 2); | |
context.rotate(rotation * Math.PI / 180); | |
renderCursor(0, context, scale); | |
context.lineWidth = 1; | |
context.strokeStyle = "red"; | |
if (scale >= 4) { | |
heightPixels.forEach((value, index, array) => { | |
let orx = 0 - (canvas.width / 2); | |
let ory = (canvas.width / 2) + scale / 2 - (scale * (value + 1)) - 0.5; | |
let dex = canvas.width; | |
let dey = (canvas.width / 2) + scale / 2 - (scale * (value + 1)) + -0.5; | |
context.moveTo(orx, ory); | |
context.lineTo(dex, dey); | |
context.stroke(); | |
}); | |
widthPixels.forEach((value, index, array) => { | |
let orx = (canvas.width / 2) + scale - (scale * (value + 1)) + 0.5; | |
let ory = -canvas.height/2; | |
let dex = (canvas.width / 2) + scale - (scale * (value + 1)) + 0.5; | |
let dey = canvas.height/2; | |
context.moveTo(orx, ory); | |
context.lineTo(dex, dey); | |
context.stroke() | |
}); | |
} | |
let url = canvas.toDataURL(); | |
document.getElementById("testArea").style.cursor = `url(${url}) ${scale*10} ${scale*11}, crosshair` | |
}; | |
renderEverything(); | |
let rotationSlider = document.getElementById("rotation"); | |
let rotationDisplay = document.getElementById("rotationDisplay"); | |
rotationSlider.addEventListener("input", () => { | |
rotation = rotationSlider.value; | |
rotationDisplay.innerText = `${rotationSlider.value}°`; | |
document.getElementById("testArea").style.transform = `rotate(${rotationSlider.value}deg)`; | |
renderEverything(); | |
}) | |
</script> | |
<script id="jsbin-source-html" type="text/html"><!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Procedurally generated cursor</title> | |
<style> | |
td:first-child, td:last-child { | |
text-align: right; | |
} | |
td:last-child { | |
font-family: monospace; | |
width: 3em; | |
} | |
#cursorRender { | |
image-rendering: pixelated; | |
border: 1px solid red; | |
} | |
.test { | |
border: 1px solid blue; | |
width: 75vh; | |
height: 10em; | |
padding: 1em; | |
overflow: auto; | |
display: flex; | |
align-items: center; | |
justify-content: center; | |
} | |
.testArea { | |
} | |
</style> | |
</head> | |
<body> | |
<canvas id="cursorRender" width="128" height="256"></canvas> | |
<form> | |
<table> | |
<tbody> | |
<tr> | |
<td><strong>Rotation</strong></td> | |
<td><input type="range" min="0" max="360" id="rotation" value="0"></td> | |
<td id="rotationDisplay">0°</td> | |
</tr> | |
</tbody> | |
</table> | |
<div class="test"> | |
<div class="testArea" id="testArea" contenteditable="true"> | |
Test | |
</div> | |
</div> | |
</form> | |
<script> | |
let canvas = document.getElementById("cursorRender"); | |
let context = canvas.getContext("2d"); | |
let scale = 2; | |
let rotation = 0; | |
let gWidth = 21; | |
let gHeight = 20; | |
let roundRect = (ctx, x, y, width, height, radius, fill, stroke) => { | |
if (typeof stroke == 'undefined') { | |
stroke = true; | |
} | |
if (typeof radius === 'undefined') { | |
radius = 5; | |
} | |
if (typeof radius === 'number') { | |
radius = {tl: radius, tr: radius, br: radius, bl: radius}; | |
} else { | |
var defaultRadius = {tl: 0, tr: 0, br: 0, bl: 0}; | |
for (var side in defaultRadius) { | |
radius[side] = radius[side] || defaultRadius[side]; | |
} | |
} | |
ctx.beginPath(); | |
ctx.moveTo(x + radius.tl, y); | |
ctx.lineTo(x + width - radius.tr, y); | |
ctx.quadraticCurveTo(x + width, y, x + width, y + radius.tr); | |
ctx.lineTo(x + width, y + height - radius.br); | |
ctx.quadraticCurveTo(x + width, y + height, x + width - radius.br, y + height); | |
ctx.lineTo(x + radius.bl, y + height); | |
ctx.quadraticCurveTo(x, y + height, x, y + height - radius.bl); | |
ctx.lineTo(x, y + radius.tl); | |
ctx.quadraticCurveTo(x, y, x + radius.tl, y); | |
ctx.closePath(); | |
if (fill) { | |
ctx.fill(); | |
} | |
if (stroke) { | |
ctx.stroke(); | |
} | |
}; | |
let renderCursor = (angle, context, scaleFrom16) => { | |
const s = scaleFrom16; | |
const o = s * 2; | |
context.fillStyle = "rgb(0,0,0)"; | |
context.strokeStyle = "black"; | |
context.lineWidth = s * 1; | |
roundRect(context, s * -8, o * -3.25, s * 8, s * 13, {tl: 0, tr: s * 2, bl: 0, br: s * 2}, false, true); | |
roundRect(context, 0, o * -3.25, s * 8, s * 13, {tl: s * 2, tr: 0, bl: s * 2, br: 0}, false, true); | |
context.moveTo(s * -2.5, s * 0.5); | |
context.lineTo(s * 2.5, s * 0.5); | |
context.stroke(); | |
context.clearRect(s*-9.5, -canvas.height, s * 5, canvas.height*2); | |
context.clearRect(s *4.5, -canvas.height, s * 5, canvas.height*2); | |
}; | |
canvas.width = scale * gWidth; | |
canvas.height = scale * gHeight; | |
let renderEverything = () => { | |
let widthPixels = [...Array(canvas.width / scale).keys()]; | |
let heightPixels = [...Array(canvas.height / scale).keys()]; | |
context.clearRect(-canvas.width, -canvas.height, canvas.width*2, canvas.height*2); | |
context.resetTransform(); | |
context.translate(canvas.width / 2, canvas.height / 2); | |
context.rotate(rotation * Math.PI / 180); | |
renderCursor(0, context, scale); | |
context.lineWidth = 1; | |
context.strokeStyle = "red"; | |
if (scale >= 4) { | |
heightPixels.forEach((value, index, array) => { | |
let orx = 0 - (canvas.width / 2); | |
let ory = (canvas.width / 2) + scale / 2 - (scale * (value + 1)) - 0.5; | |
let dex = canvas.width; | |
let dey = (canvas.width / 2) + scale / 2 - (scale * (value + 1)) + -0.5; | |
context.moveTo(orx, ory); | |
context.lineTo(dex, dey); | |
context.stroke(); | |
}); | |
widthPixels.forEach((value, index, array) => { | |
let orx = (canvas.width / 2) + scale - (scale * (value + 1)) + 0.5; | |
let ory = -canvas.height/2; | |
let dex = (canvas.width / 2) + scale - (scale * (value + 1)) + 0.5; | |
let dey = canvas.height/2; | |
context.moveTo(orx, ory); | |
context.lineTo(dex, dey); | |
context.stroke() | |
}); | |
} | |
let url = canvas.toDataURL(); | |
document.getElementById("testArea").style.cursor = `url(${url}) ${scale*10} ${scale*11}, crosshair` | |
}; | |
renderEverything(); | |
let rotationSlider = document.getElementById("rotation"); | |
let rotationDisplay = document.getElementById("rotationDisplay"); | |
rotationSlider.addEventListener("input", () => { | |
rotation = rotationSlider.value; | |
rotationDisplay.innerText = `${rotationSlider.value}°`; | |
document.getElementById("testArea").style.transform = `rotate(${rotationSlider.value}deg)`; | |
renderEverything(); | |
}) | |
<\/script> | |
</body> | |
</html> | |
</script> | |
</body> | |
</html> |
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