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Houdini example
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| class ArrowWorklet { | |
| static get contextOptions() { | |
| return { alpha: true }; | |
| } | |
| static get inputProperties() { | |
| return [ | |
| '--arrow-bg-color', | |
| '--arrow-outline-color', | |
| '--arrow-length', | |
| '--arrow-outline-width', | |
| '--arrow-line-join', | |
| ]; | |
| } | |
| static get inputArguments() { | |
| return ['*']; | |
| } | |
| toPx(value) { | |
| return (new CSSUnitValue(value.value, value.unit)).to('px').value; | |
| } | |
| paint(ctx, size, props, args) { | |
| const arrowLength = this.toPx(props.get('--arrow-length')); | |
| const lw = this.toPx(props.get('--arrow-outline-width')); | |
| const lw2 = lw / 2; | |
| ctx.lineWidth = lw; | |
| ctx.lineJoin = props.get('--arrow-line-join').toString().substr(1); | |
| ctx.fillStyle = props.get('--arrow-bg-color'); | |
| ctx.strokeStyle = props.get('--arrow-outline-color'); | |
| const { width, height } = size; | |
| const left = lw2; | |
| const top = lw2; | |
| const right = width - lw2; | |
| const bottom = height - lw2; | |
| const path = []; | |
| switch (args[0].toString()) { | |
| case 'top': | |
| path.push( | |
| [left, bottom], | |
| [left, top + arrowLength], | |
| [width / 2, top], | |
| [right, top + arrowLength], | |
| [right, bottom], | |
| ); | |
| break; | |
| case 'bottom': | |
| path.push( | |
| [right, top], | |
| [right, bottom - arrowLength], | |
| [width / 2, bottom], | |
| [left, bottom - arrowLength], | |
| [left, top], | |
| ); | |
| break; | |
| case 'left': | |
| path.push( | |
| [right, bottom], | |
| [left + arrowLength, bottom], | |
| [left, height / 2], | |
| [left + arrowLength, top], | |
| [right, top], | |
| ); | |
| break; | |
| default: | |
| path.push( | |
| [left, top], | |
| [right - arrowLength, top], | |
| [right, height / 2], | |
| [right - arrowLength, bottom], | |
| [left, bottom], | |
| ); | |
| break; | |
| } | |
| this.drawPath(ctx, path); | |
| ctx.fill(); | |
| this.drawPath(ctx, path); | |
| ctx.stroke(); | |
| } | |
| drawPath(ctx, path) { | |
| ctx.beginPath(); | |
| ctx.moveTo(path[0][0], path[0][1]); | |
| ctx.lineTo(path[1][0], path[1][1]); | |
| ctx.lineTo(path[2][0], path[2][1]); | |
| ctx.lineTo(path[3][0], path[3][1]); | |
| ctx.lineTo(path[4][0], path[4][1]); | |
| ctx.closePath(); | |
| } | |
| } | |
| registerPaint('arrow', ArrowWorklet); |
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| <!doctype html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> | |
| <style> | |
| :root { | |
| --v-arrow-padding: 0.6em; | |
| --v-arrow-length: 1em; | |
| --g-trans-dur-in: 0.1s; | |
| --g-trans-dur-out: 0.6s; | |
| } | |
| body { | |
| background-color: rgb(177 191 163); | |
| font-family: sans-serif; | |
| } | |
| .container { | |
| display: flex; | |
| width: 400px; | |
| margin: 0 auto; | |
| flex-direction: column; | |
| } | |
| .arrow { | |
| background-image: paint(arrow, right); | |
| padding: var(--v-arrow-padding); | |
| padding-right: calc(var(--v-arrow-length) + var(--v-arrow-padding)); | |
| transition: --arrow-outline-color calc(var(--g-trans-dur-out) * 0.6), | |
| --arrow-length calc(var(--g-trans-dur-out) * 1.5), | |
| --arrow-outline-width var(--g-trans-dur-out), | |
| --arrow-bg-color var(--g-trans-dur-out), | |
| margin calc(var(--g-trans-dur-out) * 1.5); | |
| --arrow-bg-color: rgba(220, 220, 220, 0.5); | |
| --arrow-outline-color: rgba(0, 127, 255, 0); | |
| --arrow-length: 0px; | |
| --arrow-outline-width: 1px; | |
| margin-right: var(--v-arrow-length); | |
| } | |
| .arrow:hover { | |
| --arrow-bg-color: rgba(220, 220, 220, 1); | |
| --arrow-outline-color: rgba(0, 127, 255, 1); | |
| --arrow-length: var(--v-arrow-length); | |
| margin-right: 0; | |
| --arrow-outline-width: 3px; | |
| transition: --arrow-outline-color var(--g-trans-dur-in), | |
| --arrow-length var(--g-trans-dur-in), | |
| --arrow-outline-width var(--g-trans-dur-in), | |
| --arrow-bg-color var(--g-trans-dur-in), | |
| margin var(--g-trans-dur-in); | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <div class="container"> | |
| <div class="arrow">lorem ipsum dolor</div> | |
| <div class="arrow">sit amet consectetur</div> | |
| <div class="arrow">adipisici elit sed</div> | |
| <div class="arrow">eiusmod tempor incidunt</div> | |
| <div class="arrow">ut labore et</div> | |
| <div class="arrow">dolore magna aliqua</div> | |
| <div class="arrow">ut enim ad minim</div> | |
| <div class="arrow">veniam quis nostrud</div> | |
| <div class="arrow">exercitation ullamco laboris</div> | |
| <div class="arrow">nisi ut aliquid</div> | |
| </div> | |
| <script type="module"> | |
| CSS.registerProperty({ | |
| name: '--arrow-bg-color', | |
| syntax: '<color>', | |
| inherits: true, | |
| initialValue: 'transparent', | |
| }); | |
| CSS.registerProperty({ | |
| name: '--arrow-outline-color', | |
| syntax: '<color>', | |
| inherits: true, | |
| initialValue: 'transparent', | |
| }); | |
| CSS.registerProperty({ | |
| name: '--arrow-outline-width', | |
| syntax: '<length>', | |
| inherits: true, | |
| initialValue: '1px', | |
| }); | |
| CSS.registerProperty({ | |
| name: '--arrow-length', | |
| syntax: '<length>', | |
| inherits: true, | |
| initialValue: '10px', | |
| }); | |
| CSS.registerProperty({ | |
| name: '--arrow-line-join', | |
| syntax: '*', | |
| inherits: true, | |
| initialValue: 'round', | |
| }); | |
| CSS.paintWorklet.addModule('ArrowWorklet.js'); | |
| </script> | |
| </body> |
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