doc/class_object.html

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 372 </script>
 373 <title>Object Class Reference</title>
 374 </head>
 375 <body>
 376 <div id="header">
 377 <h1>Object Class Reference</h1>
 378 <div id="toc">
 379   <div id="toctitle">Table of Contents</div>
 380   <noscript><p><b>JavaScript must be enabled in your browser to display the table of contents.</b></p></noscript>
 381 </div>
 382 </div>
 383 <h2>1. Attributes</h2>
 384 <div class="sectionbody">
 385 <p><em>Italics</em> means private (in the sense that they shouldn't be set manually).</p>
 386 <div class="tableblock">
 387 <table rules="all"
 388 frame="hsides"
 389 cellspacing="0" cellpadding="4">
 390 <col width="148" />
 391 <col width="240" />
 392 <thead>
 393   <tr>
 394     <th align="left">
 395     Attribute
 396     </th>
 397     <th align="left">
 398     Description
 399     </th>
 400   </tr>
 401 </thead>
 402 <tbody valign="top">
 403   <tr>
 404     <td align="left">
 405     x
 406     </td>
 407     <td align="left">
 408     x position (on screen)
 409     </td>
 410   </tr>
 411   <tr>
 412     <td align="left">
 413     y
 414     </td>
 415     <td align="left">
 416     y position (on screen)
 417     </td>
 418   </tr>
 419   <tr>
 420     <td align="left">
 421     w
 422     </td>
 423     <td align="left">
 424     width
 425     </td>
 426   </tr>
 427   <tr>
 428     <td align="left">
 429     h
 430     </td>
 431     <td align="left">
 432     height
 433     </td>
 434   </tr>
 435   <tr>
 436     <td align="left">
 437     x_offset
 438     </td>
 439     <td align="left">
 440     drawing offset
 441     </td>
 442   </tr>
 443   <tr>
 444     <td align="left">
 445     y_offset
 446     </td>
 447     <td align="left">
 448     drawing offset
 449     </td>
 450   </tr>
 451   <tr>
 452     <td align="left">
 453     angle
 454     </td>
 455     <td align="left">
 456     movement heading in degrees
 457     </td>
 458   </tr>
 459   <tr>
 460     <td align="left">
 461     speed
 462     </td>
 463     <td align="left">
 464     speed (in pixels/update)
 465     </td>
 466   </tr>
 467   <tr>
 468     <td align="left">
 469     image
 470     </td>
 471     <td align="left">
 472     image of the Object
 473     </td>
 474   </tr>
 475   <tr>
 476     <td align="left">
 477     rects
 478     </td>
 479     <td align="left">
 480     list of collision Rects
 481     </td>
 482   </tr>
 483   <tr>
 484     <td align="left">
 485     type
 486     </td>
 487     <td align="left">
 488     type of Object (for collision)
 489     </td>
 490   </tr>
 491   <tr>
 492     <td align="left">
 493     max_updates
 494     </td>
 495     <td align="left">
 496     maximum number of updates before Object self collects
 497     </td>
 498   </tr>
 499   <tr>
 500     <td align="left">
 501     <em>num_updates</em>
 502     </td>
 503     <td align="left">
 504     current number of updates
 505     </td>
 506   </tr>
 507   <tr>
 508     <td align="left">
 509     <em>death_anim</em>
 510     </td>
 511     <td align="left">
 512     flag for if Object is in death animation (affects collision)
 513     </td>
 514   </tr>
 515   <tr>
 516     <td align="left">
 517     <em>collect</em>
 518     </td>
 519     <td align="left">
 520     flag to indicate if an Object should be collected
 521     </td>
 522   </tr>
 523 </tbody>
 524 </table>
 525 </div>
 526 </div>
 527 <h2>2. Methods</h2>
 528 <div class="sectionbody">
 529 <div class="tableblock">
 530 <table rules="all"
 531 frame="hsides"
 532 cellspacing="0" cellpadding="4">
 533 <col width="262" />
 534 <col width="240" />
 535 <thead>
 536   <tr>
 537     <th align="left">
 538     Method
 539     </th>
 540     <th align="left">
 541     Description
 542     </th>
 543   </tr>
 544 </thead>
 545 <tbody valign="top">
 546   <tr>
 547     <td align="left">
 548     new(o)
 549     </td>
 550     <td align="left">
 551     constructor
 552     </td>
 553   </tr>
 554   <tr>
 555     <td align="left">
 556     update()
 557     </td>
 558     <td align="left">
 559     updates the Object's state
 560     </td>
 561   </tr>
 562   <tr>
 563     <td align="left">
 564     draw()
 565     </td>
 566     <td align="left">
 567     draws the Object's image at (x, y)
 568     </td>
 569   </tr>
 570   <tr>
 571     <td align="left">
 572     collide(ids, object)
 573     </td>
 574     <td align="left">
 575     method executed upon collision (undefined for base class)
 576     </td>
 577   </tr>
 578   <tr>
 579     <td align="left">
 580     get_center()
 581     </td>
 582     <td align="left">
 583     returns the center coordinates of the Object
 584     </td>
 585   </tr>
 586   <tr>
 587     <td align="left">
 588     set_origin()
 589     </td>
 590     <td align="left">
 591     sets the drawing offset (sprite is offset by these amounts to the upper left)
 592     </td>
 593   </tr>
 594 </tbody>
 595 </table>
 596 </div>
 597 </div>
 598 <h2>3. Usage</h2>
 599 <div class="sectionbody">
 600 <p>This class is not designed to be instantiated directly, instead it should be
 601 extended and serve as the base for all in-game objects.
 602 An example object definition is as follows:</p>
 603 <div class="listingblock">
 604 <div class="content"><!-- Generator: GNU source-highlight 2.4
 605 by Lorenzo Bettini
 606 http://www.lorenzobettini.it
 607 http://www.gnu.org/software/src-highlite -->
 608 <pre><tt>MyObj <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">Object:new</span></span><span style="color: #990000">()</span>
 609 MyObj<span style="color: #990000">.</span>attr1 <span style="color: #990000">=</span> <span style="color: #993399">4</span>
 610 MyObj<span style="color: #990000">.</span>attr2 <span style="color: #990000">=</span> <span style="color: #FF0000">"some value"</span>
 611
 612 <span style="font-style: italic"><span style="color: #9A1900">--constructor</span></span>
 613 <span style="font-weight: bold"><span style="color: #0000FF">function</span></span> <span style="font-weight: bold"><span style="color: #000000">MyObj:new</span></span><span style="color: #990000">(</span>o<span style="color: #990000">)</span>
 614   o <span style="color: #990000">=</span> o <span style="font-weight: bold"><span style="color: #0000FF">or</span></span> <span style="color: #FF0000">{}</span>
 615   <span style="font-weight: bold"><span style="color: #000000">setmetatable</span></span><span style="color: #990000">(</span>o<span style="color: #990000">,</span> self<span style="color: #990000">)</span>
 616   self<span style="color: #990000">.</span>__index <span style="color: #990000">=</span> self
 617   <span style="font-weight: bold"><span style="color: #0000FF">return</span></span> o
 618 <span style="font-weight: bold"><span style="color: #0000FF">end</span></span>
 619
 620 <span style="font-style: italic"><span style="color: #9A1900">--other methods defined here</span></span>
 621 </tt></pre></div></div>
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