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  344. Start
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  346. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/customize/">
  347. Customize
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  349. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/classes/">
  350. Classes
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  353. Modular
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  355. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/responsiveness/">
  356. Responsiveness
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  358. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/variables/">
  359. Variables
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  361. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/colors/">
  362. Colors
  363. </a>
  364. <a class="navbar-item is-tab is-active" href="http://bulma.io/versions/0.5.2/documentation/overview/functions/">
  365. Functions
  366. </a>
  367. <a class="navbar-item is-tab " href="http://bulma.io/versions/0.5.2/documentation/overview/mixins/">
  368. Mixins
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  373. <section class="section">
  374. <div class="container">
  375. <h1 class="title">Functions</h1>
  376. <h2 class="subtitle">Utility functions to calculate colors and other values</h2>
  377. <hr>
  378. <div class="content">
  379. <p>Bulma uses 5 custom functions to help define the values and colors dynamically:</p>
  380. <ul>
  381. <li><code>powerNumber($number, $exp)</code>: calculates the value of a number exposed to another one. Returns a number.</li>
  382. <li><code>colorLuminance($color)</code>: defines if a color is dark or light. Return a decimal number between 0 and 1 where <= 0.5 is dark and > 0.5 is light.</li>
  383. <li><code>findColorInvert($color)</code>: returns either 70% transparent black or 100% opaque white depending on the luminance of the color.</li>
  384. </ul>
  385. </div>
  386. <hr style="margin-bottom: 0;">
  387. <h3 id="the-code-findcolorinvert-code-function" class="title is-4 is-spaced bd-anchor-title">
  388. The <code>findColorInvert()</code> function
  389. <a class="bd-anchor-link" href="#the-code-findcolorinvert-code-function">
  390. #
  391. </a>
  392. </h3>
  393. <div class="content">
  394. <p>The <code>findColorInvert($color)</code> function takes a <strong>color</strong> as an input, and outputs either transparent <strong>black</strong> <code>rgba(#000, 0.7)</code> or <strong>white</strong> <code>#fff</code>:</p>
  395. <ul>
  396. <li>if <code>colorLuminance($color) > 0.55</code>, it outputs <code>rgba(#000, 0.7)</code></li>
  397. <li>otherwise, it outputs <code>#fff</code></li>
  398. </ul>
  399. <p>Its purpose is to guarantee a <strong>readable</strong> shade for the <em>text</em> when the input color is used as the <em>background</em>.</p>
  400. <table class="table is-bordered">
  401. <thead>
  402. <tr>
  403. <th>color</th>
  404. <th>color luminance</th>
  405. <th>findColorInvert()</th>
  406. <th>result</th>
  407. </tr>
  408. </thead>
  409. <tbody>
  410. <tr>
  411. <td>
  412. <span class="bd-color" style="background: #00d1b2;"></span>
  413. <code>#00d1b2</code>
  414. </td>
  415. <td>
  416. <code>0.52831</code>
  417. </td>
  418. <td>
  419. <span class="bd-color" style="background: #fff;"></span>
  420. <code>#fff</code>
  421. </td>
  422. <td>
  423. <a class="button" style="background: #00d1b2; border-color: #00d1b2; color: #fff;">
  424. Button
  425. </a>
  426. </td>
  427. </tr>
  428. <tr>
  429. <td>
  430. <span class="bd-color" style="background: #3273dc;"></span>
  431. <code>#3273dc</code>
  432. </td>
  433. <td>
  434. <code>0.23119</code>
  435. </td>
  436. <td>
  437. <span class="bd-color" style="background: #fff;"></span>
  438. <code>#fff</code>
  439. </td>
  440. <td>
  441. <a class="button" style="background: #3273dc; border-color: #3273dc; color: #fff;">
  442. Button
  443. </a>
  444. </td>
  445. </tr>
  446. <tr>
  447. <td>
  448. <span class="bd-color" style="background: #23d160;"></span>
  449. <code>#23d160</code>
  450. </td>
  451. <td>
  452. <code>0.51067</code>
  453. </td>
  454. <td>
  455. <span class="bd-color" style="background: #fff;"></span>
  456. <code>#fff</code>
  457. </td>
  458. <td>
  459. <a class="button" style="background: #23d160; border-color: #23d160; color: #fff;">
  460. Button
  461. </a>
  462. </td>
  463. </tr>
  464. <tr>
  465. <td>
  466. <span class="bd-color" style="background: #ffdd57;"></span>
  467. <code>#ffdd57</code>
  468. </td>
  469. <td>
  470. <code>0.76863</code>
  471. </td>
  472. <td>
  473. <span class="bd-color" style="background: rgba(0, 0, 0, 0.7);"></span>
  474. <code>rgba(0, 0, 0, 0.7)</code>
  475. </td>
  476. <td>
  477. <a class="button" style="background: #ffdd57; border-color: #ffdd57; color: rgba(0, 0, 0, 0.7);">
  478. Button
  479. </a>
  480. </td>
  481. </tr>
  482. <tr>
  483. <td>
  484. <span class="bd-color" style="background: #ff3860;"></span>
  485. <code>#ff3860</code>
  486. </td>
  487. <td>
  488. <code>0.27313</code>
  489. </td>
  490. <td>
  491. <span class="bd-color" style="background: #fff;"></span>
  492. <code>#fff</code>
  493. </td>
  494. <td>
  495. <a class="button" style="background: #ff3860; border-color: #ff3860; color: #fff;">
  496. Button
  497. </a>
  498. </td>
  499. </tr>
  500. <tr>
  501. <td>
  502. <span class="bd-color" style="background: #ffb3b3;"></span>
  503. <code>#ffb3b3</code>
  504. </td>
  505. <td>
  506. <code>0.61796</code>
  507. </td>
  508. <td>
  509. <span class="bd-color" style="background: rgba(0,0,0,0.7);"></span>
  510. <code>rgba(0,0,0,0.7)</code>
  511. </td>
  512. <td>
  513. <a class="button" style="background: #ffb3b3; border-color: #ffb3b3; color: rgba(0,0,0,0.7);">
  514. Button
  515. </a>
  516. </td>
  517. </tr>
  518. <tr>
  519. <td>
  520. <span class="bd-color" style="background: #ffbc6b;"></span>
  521. <code>#ffbc6b</code>
  522. </td>
  523. <td>
  524. <code>0.63053</code>
  525. </td>
  526. <td>
  527. <span class="bd-color" style="background: rgba(0,0,0,0.7);"></span>
  528. <code>rgba(0,0,0,0.7)</code>
  529. </td>
  530. <td>
  531. <a class="button" style="background: #ffbc6b; border-color: #ffbc6b; color: rgba(0,0,0,0.7);">
  532. Button
  533. </a>
  534. </td>
  535. </tr>
  536. <tr>
  537. <td>
  538. <span class="bd-color" style="background: hsl(294, 71%, 79%);"></span>
  539. <code>hsl(294, 71%, 79%)</code>
  540. </td>
  541. <td>
  542. <code>0.5529</code>
  543. </td>
  544. <td>
  545. <span class="bd-color" style="background: rgba(0,0,0,0.7);"></span>
  546. <code>rgba(0,0,0,0.7)</code>
  547. </td>
  548. <td>
  549. <a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: rgba(0,0,0,0.7);">
  550. Button
  551. </a>
  552. </td>
  553. </tr>
  554. </tbody>
  555. </table>
  556. <p>
  557. For colors that have a luminance close to the <code>0.55</code> threshold, it can be useful to <strong>override</strong> the <code>findColorInvert()</code> function, and rather set the invert color <strong>manually.</strong>
  558. <br>
  559. For example, this shade of <span class="bd-color" style="background: hsl(294, 71%, 79%); float: none; height: 16px; width: 16px; margin-right: 0; vertical-align: middle;"></span> purple has a color luminance of <code>0.5529</code>. It can be preferable to set a color invert of white instead of transparent black:
  560. </p>
  561. <table class="table is-bordered">
  562. <tbody>
  563. <tr>
  564. <th>
  565. with <code>findColorInvert()</code>
  566. </th>
  567. <td>
  568. <code>$purple-invert: findColorInvert($purple)</code>
  569. </td>
  570. <td>
  571. <span class="bd-color" style="background: rgba(0,0,0,0.7);"></span>
  572. <code>rgba(0,0,0,0.7)</code>
  573. </td>
  574. <td>
  575. <a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: rgba(0,0,0,0.7);">
  576. Button
  577. </a>
  578. </td>
  579. </tr>
  580. <tr>
  581. <th>
  582. with manual setting
  583. </th>
  584. <td>
  585. <code>$purple-invert: #fff</code>
  586. </td>
  587. <td>
  588. <span class="bd-color" style="background: #fff;"></span>
  589. <code>#fff</code>
  590. </td>
  591. <td>
  592. <a class="button" style="background: hsl(294, 71%, 79%); border-color: hsl(294, 71%, 79%); color: #fff;">
  593. Button
  594. </a>
  595. </td>
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