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update_loop.html

update_loop.html 37 KB
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  511. </style>
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  512. </head>
    513. 

  513. <body class="article toc2 toc-left">
    514. 

  514. <div id="header">
    515. 

  515. <h1>Main Update Loop</h1>
    516. 

  516. <div class="details">
    517. 

  517. <span id="author" class="author"></span><br>
    518. 

  518. <span id="revnumber">version ,</span>
    519. 

  519. <span id="revdate">2016/03/17 20:48</span>
    520. 

  520. </div>
    521. 

  521. <div id="toc" class="toc2">
    522. 

  522. <div id="toctitle">Table of Contents</div>
    523. 

  523. <ul class="sectlevel1">
    524. 

  524. <li><a href="#usage">Usage</a></li>
    525. 

  525. </ul>
    526. 

  526. </div>
    527. 

  527. </div>
    528. 

  528. <div id="content">
    529. 

  529. <div id="preamble">
    530. 

  530. <div class="sectionbody">
    531. 

  531. <div class="paragraph">
    532. 

  532. <p>Extending your application from com.jme3.app.<a href="../../jme3/intermediate/simpleapplication.html">SimpleApplication</a> provides you with an update loop. This is where you implement your game logic (game mechanics).</p>
    533. 

  533. </div>
    534. 

  534. <div class="paragraph">
    535. 

  535. <p>Some usage examples: Here you remote-control NPCs (computer controlled characters), generate game events, and respond to user input.</p>
    536. 

  536. </div>
    537. 

  537. <div class="paragraph">
    538. 

  538. <p>To let you see the main update loop in context, understand that the SimpleApplication does the following:</p>
    539. 

  539. </div>
    540. 

  540. <div class="ulist">
    541. 

  541. <ul>
    542. 

  542. <li>
    543. 

  543. <p><strong>Initialization</strong> – Execute <code>simpleInitApp()</code> method once.</p>
    544. 

  544. </li>
    545. 

  545. <li>
    546. 

  546. <p><strong>Main Update Loop</strong></p>
    547. 

  547. <div class="olist loweralpha">
    548. 

  548. <ol class="loweralpha" type="a">
    549. 

  549. <li>
    550. 

  550. <p>Input listeners respond to mouse clicks and keyboard presses – <a href="../../jme3/advanced/input_handling.html">Input handling</a></p>
    551. 

  551. </li>
    552. 

  552. <li>
    553. 

  553. <p>Update game state:</p>
    554. 

  554. <div class="olist lowerroman">
    555. 

  555. <ol class="lowerroman" type="i">
    556. 

  556. <li>
    557. 

  557. <p>Update overall game state – Execute <a href="../../jme3/advanced/application_states.html">Application States</a></p>
    558. 

  558. </li>
    559. 

  559. <li>
    560. 

  560. <p>User code update – Execute <code>simpleUpdate()</code> method</p>
    561. 

  561. </li>
    562. 

  562. <li>
    563. 

  563. <p>Logical update of entities – Execute <a href="../../jme3/advanced/custom_controls.html">Custom Controls</a></p>
    564. 

  564. </li>
    565. 

  565. </ol>
    566. 

  566. </div>
    567. 

  567. </li>
    568. 

  568. <li>
    569. 

  569. <p>Render audio and video</p>
    570. 

  570. <div class="olist lowerroman">
    571. 

  571. <ol class="lowerroman" type="i">
    572. 

  572. <li>
    573. 

  573. <p><a href="../../jme3/advanced/application_states.html">Application States</a> rendering.</p>
    574. 

  574. </li>
    575. 

  575. <li>
    576. 

  576. <p>Scene rendering.</p>
    577. 

  577. </li>
    578. 

  578. <li>
    579. 

  579. <p>User code rendering – Execute <code>simpleRender()</code> method.</p>
    580. 

  580. </li>
    581. 

  581. </ol>
    582. 

  582. </div>
    583. 

  583. </li>
    584. 

  584. <li>
    585. 

  585. <p>Repeat loop.</p>
    586. 

  586. </li>
    587. 

  587. </ol>
    588. 

  588. </div>
    589. 

  589. </li>
    590. 

  590. <li>
    591. 

  591. <p><strong>Quit</strong> – If user requests <code>exit()</code>, execute <code>cleanup()</code> and <code>destroy()</code>.<br>
    592. 

  592. The jME window closes and the loop ends.</p>
    593. 

  593. </li>
    594. 

  594. </ul>
    595. 

  595. </div>
    596. 

  596. </div>
    597. 

  597. </div>
    598. 

  598. <div class="sect1">
    599. 

  599. <h2 id="usage">Usage</h2>
    600. 

  600. <div class="sectionbody">
    601. 

  601. <div class="paragraph">
    602. 

  602. <p>In a trivial <a href="../../jme3/intermediate/simpleapplication.html">SimpleApplication</a> (such as a <a href="../../jme3/beginner.html">Hello World tutorial</a>), all code is either in the <code>simpleInitApp()</code> (initialization) or <code>simpleUpdate()</code> (behaviour) method – or in a helper method/class that is called from one of these two. This trivial approach will make your main class very long, hard to read, and hard to maintain. You don&#8217;t need to load the whole scene at once, and you don&#8217;t need to run all conditionals tests all the time.</p>
    603. 

  603. </div>
    604. 

  604. <div class="paragraph">
    605. 

  605. <p>It&#8217;s a best practice to modularize your game mechanics and spread out initialization and update loop code over several Java objects:</p>
    606. 

  606. </div>
    607. 

  607. <div class="ulist">
    608. 

  608. <ul>
    609. 

  609. <li>
    610. 

  610. <p>Move modular code blocks from the <code>simpleInitApp()</code> method into <a href="../../jme3/advanced/application_states.html">AppStates</a>. Attach AppStates to initialize custom subsets of “one dungeon, and detach it when the player exits this “dungeon.<br>
    611. 

  611. Examples: Weather/sky audio and visuals, physics collision shapes, sub-rootnodes of individual dungeons including dungeon NPCs, etc.</p>
    612. 

  612. </li>
    613. 

  613. <li>
    614. 

  614. <p>Move modular code blocks from the <code>simpleUpdate()</code> method into the update loops of <a href="../../jme3/advanced/custom_controls.html">Custom Controls</a> to control individual entity behavior (NPCs), and into the update method of <a href="../../jme3/advanced/application_states.html">AppStates</a> to control world events.<br>
    615. 

  615. Examples: Weather behaviour, light behaviour, physics behaviour, individual NPC behaviour, trap behaviour, etc.</p>
    616. 

  616. </li>
    617. 

  617. </ul>
    618. 

  618. </div>
    619. 

  619. </div>
    620. 

  620. </div>
    621. 

  621. </div>
    622. 

  622. <div id="footer">
    623. 

  623. <div id="footer-text">
    624. 

  624. Version <br>
    625. 

  625. Last updated 2016-06-05 15:58:32 UTC
    626. 

  626. </div>
    627. 

  627. </div>
    628. 

  628. </body>
    629. 

  629. </html>
    630.