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<section id="pygame-intro">
<section id="python-pygame-introduction">
<h2>Python Pygame Introduction<a class="headerlink" href="#python-pygame-introduction" title="Permalink to this heading"></a></h2>
<dl class="docinfo field-list simple">
<dt class="field-odd">Author<span class="colon">:</span></dt>
<dd class="field-odd"><p>Pete Shinners</p>
</dd>
<dt class="field-even">Contact<span class="colon">:</span></dt>
<dd class="field-even"><p><a class="reference external" href="mailto:pete&#37;&#52;&#48;shinners&#46;org">pete<span>&#64;</span>shinners<span>&#46;</span>org</a></p>
</dd>
</dl>
<p>This article is an introduction to the <a class="reference external" href="http://www.pygame.org">pygame library</a>
for <a class="reference external" href="https://www.python.org/">Python programmers</a>.
The original version appeared in the <a class="reference external" href="https://web.archive.org/web/20030810011958/http://store.pyzine.com:80/article.phtml?a=2">PyZine volume 1 issue 3</a>.
This version contains minor revisions, to
create an all-around better article. Pygame is a Python extension
library that wraps the <a class="reference external" href="http://www.libsdl.org">SDL</a> library
and its helpers.</p>
<section id="history">
<h3>HISTORY<a class="headerlink" href="#history" title="Permalink to this heading"></a></h3>
<p>Pygame started in the summer of 2000. Being a C programmer of many
years, I discovered both Python and SDL at about the same time. You are
already familiar with Python, which was at version 1.5.2. You may need
an introduction to SDL, which is the Simple DirectMedia Layer.
Created by Sam Lantinga, SDL is a cross-platform C library for
controlling multimedia, comparable to DirectX. It has been used for
hundreds of commercial and open source games. I was impressed at how clean
and straightforward both projects were and it wasn't long before I
realized mixing Python and SDL was an interesting proposal.</p>
<p>I discovered a small project already under-way with exactly the same
idea, PySDL. Created by Mark Baker, PySDL was a straightforward
implementation of SDL as a Python extension. The interface was cleaner
than a generic SWIG wrapping, but I felt it forced a &quot;C style&quot; of code.
The sudden death of PySDL prompted me to take on a new project of my
own.</p>
<p>I wanted to put together a project that really took advantage of
Python. My goal was to make it easy to do the simple things, and
straightforward to do the difficult things. Pygame was started in
October, 2000. Six months later pygame version 1.0 was released.</p>
</section>
<section id="taste">
<h3>TASTE<a class="headerlink" href="#taste" title="Permalink to this heading"></a></h3>
<p>I find the best way to understand a new library is to jump straight
into an example. In the early days of pygame, I created a bouncing ball
animation with 7 lines of code. Let's take a look at a friendlier
version of that same thing. This should be simple enough to follow
along, and a complete breakdown follows.</p>
<img alt="../_images/intro_ball.gif" class="inlined-right" src="../_images/intro_ball.gif" />
<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="kn">import</span> <span class="nn">sys</span><span class="o">,</span> <span class="nn">pygame</span>
<span class="linenos"> 2</span><span class="n">pygame</span><span class="o">.</span><span class="n">init</span><span class="p">()</span>
<span class="linenos"> 3</span>
<span class="linenos"> 4</span><span class="n">size</span> <span class="o">=</span> <span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="mi">320</span><span class="p">,</span> <span class="mi">240</span>
<span class="linenos"> 5</span><span class="n">speed</span> <span class="o">=</span> <span class="p">[</span><span class="mi">2</span><span class="p">,</span> <span class="mi">2</span><span class="p">]</span>
<span class="linenos"> 6</span><span class="n">black</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span><span class="p">,</span> <span class="mi">0</span>
<span class="linenos"> 7</span>
<span class="linenos"> 8</span><span class="n">screen</span> <span class="o">=</span> <span class="n">pygame</span><span class="o">.</span><span class="n">display</span><span class="o">.</span><span class="n">set_mode</span><span class="p">(</span><span class="n">size</span><span class="p">)</span>
<span class="linenos"> 9</span>
<span class="linenos">10</span><span class="n">ball</span> <span class="o">=</span> <span class="n">pygame</span><span class="o">.</span><span class="n">image</span><span class="o">.</span><span class="n">load</span><span class="p">(</span><span class="s2">&quot;intro_ball.gif&quot;</span><span class="p">)</span>
<span class="linenos">11</span><span class="n">ballrect</span> <span class="o">=</span> <span class="n">ball</span><span class="o">.</span><span class="n">get_rect</span><span class="p">()</span>
<span class="linenos">12</span>
<span class="linenos">13</span><span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
<span class="linenos">14</span> <span class="k">for</span> <span class="n">event</span> <span class="ow">in</span> <span class="n">pygame</span><span class="o">.</span><span class="n">event</span><span class="o">.</span><span class="n">get</span><span class="p">():</span>
<span class="linenos">15</span> <span class="k">if</span> <span class="n">event</span><span class="o">.</span><span class="n">type</span> <span class="o">==</span> <span class="n">pygame</span><span class="o">.</span><span class="n">QUIT</span><span class="p">:</span> <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">()</span>
<span class="linenos">16</span>
<span class="linenos">17</span> <span class="n">ballrect</span> <span class="o">=</span> <span class="n">ballrect</span><span class="o">.</span><span class="n">move</span><span class="p">(</span><span class="n">speed</span><span class="p">)</span>
<span class="linenos">18</span> <span class="k">if</span> <span class="n">ballrect</span><span class="o">.</span><span class="n">left</span> <span class="o">&lt;</span> <span class="mi">0</span> <span class="ow">or</span> <span class="n">ballrect</span><span class="o">.</span><span class="n">right</span> <span class="o">&gt;</span> <span class="n">width</span><span class="p">:</span>
<span class="linenos">19</span> <span class="n">speed</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="o">-</span><span class="n">speed</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="linenos">20</span> <span class="k">if</span> <span class="n">ballrect</span><span class="o">.</span><span class="n">top</span> <span class="o">&lt;</span> <span class="mi">0</span> <span class="ow">or</span> <span class="n">ballrect</span><span class="o">.</span><span class="n">bottom</span> <span class="o">&gt;</span> <span class="n">height</span><span class="p">:</span>
<span class="linenos">21</span> <span class="n">speed</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="o">-</span><span class="n">speed</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="linenos">22</span>
<span class="linenos">23</span> <span class="n">screen</span><span class="o">.</span><span class="n">fill</span><span class="p">(</span><span class="n">black</span><span class="p">)</span>
<span class="linenos">24</span> <span class="n">screen</span><span class="o">.</span><span class="n">blit</span><span class="p">(</span><span class="n">ball</span><span class="p">,</span> <span class="n">ballrect</span><span class="p">)</span>
<span class="linenos">25</span> <span class="n">pygame</span><span class="o">.</span><span class="n">display</span><span class="o">.</span><span class="n">flip</span><span class="p">()</span>
</pre></div>
</div>
<p>This is as simple as you can get for a bouncing animation.
First we see importing and initializing pygame is nothing noteworthy.
The <code class="docutils literal notranslate"><span class="pre">import</span> <span class="pre">pygame</span></code> imports the package with all the available
pygame modules.
The call to <code class="docutils literal notranslate"><span class="pre">pygame.init()</span></code> initializes each of these modules.</p>
<p>On <span class="codelineref">line 8</span> we create a
graphical window with the call to <code class="docutils literal notranslate"><span class="pre">pygame.display.set_mode()</span></code>.
Pygame and SDL make this easy by defaulting to the best graphics modes
for the graphics hardware. You can override the mode and SDL will
compensate for anything the hardware cannot do. Pygame represents
images as <em>Surface</em> objects.
The <code class="docutils literal notranslate"><span class="pre">display.set_mode()</span></code> function creates a new <em>Surface</em>
object that represents the actual displayed graphics. Any drawing you
do to this Surface will become visible on the monitor.</p>
<p>At <span class="codelineref">line 10</span> we load
our ball image. Pygame supports a variety of image formats through the
SDL_image library, including BMP, JPG, PNG, TGA, and GIF.
The <code class="docutils literal notranslate"><span class="pre">pygame.image.load()</span></code> function
returns us a Surface with the ball data. The Surface will keep any
colorkey or alpha transparency from the file. After loading the ball
image we create a variable named ballrect. Pygame comes with a
convenient utility object type named <a class="reference internal" href="../ref/rect.html#pygame.Rect" title="pygame.Rect"><code class="xref py py-class docutils literal notranslate"><span class="pre">Rect</span></code></a>,
which represents a rectangular area. Later, in the animation part of
the code, we will see what the <em>Rect</em> objects can do.</p>
<p>At this point, <span class="codelineref">line 13</span>,
our program is initialized and ready to run. Inside an infinite loop we
check for user input, move the ball, and then draw the ball. If you are
familiar with GUI programming, you have had experience with events and
event loops. In pygame this is no different,
we check if a <em>QUIT</em> event has happened. If so we
simply exit the program, pygame will ensure everything is cleanly
shutdown.</p>
<p>It is time to update our position for the ball.
<span class="codelineref">Lines 17</span> moves the ballrect variable by the current speed.
<span class="codelineref">Lines 18 thru 21</span> reverse the speed if the ball has moved outside the screen.
Not exactly Newtonian physics, but it is all we need.</p>
<p>On <span class="codelineref">line 23</span> we erase
the screen by filling it with a black RGB color. If you have never
worked with animations this may seem strange. You may be asking &quot;Why do
we need to erase anything, why don't we just move the ball on the
screen?&quot; That is not quite the way computer animation works. Animation
is nothing more than a series of single images, which when displayed in
sequence do a very good job of fooling the human eye into seeing
motion. The screen is just a single image that the user sees. If we did
not take the time to erase the ball from the screen, we would actually
see a &quot;trail&quot; of the ball as we continuously draw the ball in its new
positions.</p>
<p>On <span class="codelineref">line 24</span> we draw the ball image onto the screen.
Drawing of images is handled by the
<a class="reference internal" href="../ref/surface.html#pygame.Surface.blit" title="pygame.Surface.blit"><code class="xref py py-meth docutils literal notranslate"><span class="pre">Surface.blit()</span></code></a> method.
A blit basically means copying pixel colors from one image to another.
We pass the blit method a source <a class="reference internal" href="../ref/surface.html#pygame.Surface" title="pygame.Surface"><code class="xref py py-class docutils literal notranslate"><span class="pre">Surface</span></code></a>
to copy from, and a position to place the source onto the destination.</p>
<p>The last thing we need to do is actually update the visible display.
Pygame manages the display with a double buffer. When we are finished
drawing we call the <a class="tooltip reference internal" href="../ref/display.html#pygame.display.flip" title=""><code class="xref py py-func docutils literal notranslate"><span class="pre">pygame.display.flip()</span></code><span class="tooltip-content">Update the full display Surface to the screen</span></a> method.
This makes everything we have drawn on the screen Surface
become visible. This buffering makes sure we only see completely drawn
frames on the screen. Without it, the user would see the half completed
parts of the screen as they are being created.</p>
<p>That concludes this short introduction to pygame. Pygame also has
modules to do things like input handling for the keyboard, mouse, and
joystick. It can mix audio and decode streaming music.
With the <em>Surfaces</em> you can draw simple
shapes, rotate and scale the picture, and even manipulate the pixels of
an image in realtime as numpy arrays.
Pygame also has the ability to act as a
cross platform display layer for PyOpenGL. Most of the pygame modules
are written in C, few are actually done in Python.</p>
<p>The pygame website has full reference documentation for every pygame
function and tutorials for all ranges of users. The pygame source comes
with many examples of things like monkey punching and UFO shooting.</p>
</section>
<section id="python-and-gaming">
<h3>PYTHON AND GAMING<a class="headerlink" href="#python-and-gaming" title="Permalink to this heading"></a></h3>
<p>&quot;Is Python suitable for gaming?&quot; The answer is, &quot;It depends on the
game.&quot;</p>
<p>Python is actually quite capable at running games. It will likely even
surprise you how much is possible in under 30 milliseconds. Still, it
is not hard to reach the ceiling once your game begins to get more
complex. Any game running in realtime will be making full use of the
computer.</p>
<img alt="../_images/intro_blade.jpg" class="inlined-right" src="../_images/intro_blade.jpg" />
<p>Over the past several years there has been an interesting trend in game development,
the move towards higher level languages. Usually a game is split into
two major parts. The game engine, which must be as fast as possible,
and the game logic, which makes the engine actually do something. It
wasn't long ago when the engine of a game was written in assembly, with
portions written in C. Nowadays, C has moved to the game engine, while
often the game itself is written in higher level scripting languages.
Games like Quake3 and Unreal run these scripts as portable bytecode.</p>
<p>In early 2001, developer Rebel Act Studios finished their game,
Severance: Blade of Darkness. Using their own custom 3D engine, the
rest of the game is written with Python. The game is a bloody action
3rd person perspective fighter. You control medieval warriors into
intricate decapitating combination attacks while exploring dungeons and
castles. You can download third party add-ons for this game, and find
they are nothing more than Python source files.</p>
<p>More recently, Python has been used in a variety of games like Freedom
Force, and Humungous' Backyard Sports Series.</p>
<img alt="../_images/intro_freedom.jpg" class="inlined-right" src="../_images/intro_freedom.jpg" />
<p>Pygame and SDL serve as an excellent C engine for 2D games.
Games will still find the largest part of their runtime is spent
inside SDL handling the graphics.
SDL can take advantage of graphics hardware acceleration.
Enabling this can change a game from running around 40 frames per
second to over 200 frames per second. When you see your Python game
running at 200 frames per second, you realize that Python and games can
work together.</p>
<p>It is impressive how well both Python and SDL work on multiple
platforms. For example, in May of 2001 I released my own full pygame
project, SolarWolf, an arcade style action game. One thing that has
surprised me is that one year later there has been no need for any
patches, bug fixes, or updates. The game was developed entirely on
windows, but runs on Linux, Mac OSX, and many Unixes without any extra
work on my end.</p>
<p>Still, there are very clear limitations. The best way to manage
hardware accelerated graphics is not always the way to get fastest
results from software rendering. Hardware support is not available on
all platforms. When a game gets more complex, it often must commit to
one or the other. SDL has some other design limitations, things like
full screen scrolling graphics can quickly bring your game down to
unplayable speeds. While SDL is not suitable for all types of games,
remember companies like Loki have used SDL to run a wide variety of
retail quality titles.</p>
<p>Pygame is fairly low-level when it comes to writing games. You'll
quickly find yourself needing to wrap common functions into your own
game environment. The great thing about this is there is nothing inside
pygame to get in your way. Your program is in full control of
everything. The side effect of that is you will find yourself borrowing
a lot of code to get a more advanced framework put together. You'll
need a better understanding of what you are doing.</p>
</section>
<section id="closing">
<h3>CLOSING<a class="headerlink" href="#closing" title="Permalink to this heading"></a></h3>
<p>Developing games is very rewarding, there is something exciting about
being able to see and interact with the code you've written. Pygame
currently has almost 30 other projects using it. Several of them are
ready to play now. You may be surprised to visit the pygame website,
and see what other users have been able to do with Python.</p>
<p>One thing that has caught my attention is the amount of people coming
to Python for the first time to try game development. I can see why
games are a draw for new programmers, but it can be difficult since
creating games requires a firmer understanding of the language. I've
tried to support this group of users by writing many examples and
pygame tutorials for people new to these concepts.</p>
<p>In the end, my advice is to keep it simple. I cannot stress this
enough. If you are planning to create your first game, there is a
lot to learn. Even a simpler game will challenge your designs, and
complex games don't necessarily mean fun games. When you understand
Python, you can use pygame to create a simple game in only one or two
weeks. From there you'll need a surprising amount of time to add
the polish to make that into a full presentable game.</p>
<section id="pygame-modules-overview">
<h4>Pygame Modules Overview<a class="headerlink" href="#pygame-modules-overview" title="Permalink to this heading"></a></h4>
<table class="more-to-explore docutils align-default">
<colgroup>
<col style="width: 28.6%" />
<col style="width: 71.4%" />
</colgroup>
<tbody>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/cdrom.html#module-pygame.cdrom" title="pygame.cdrom: pygame module for audio cdrom control"><code class="xref py py-mod docutils literal notranslate"><span class="pre">cdrom</span></code></a></p></td>
<td><p>playback</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/cursors.html#module-pygame.cursors" title="pygame.cursors: pygame module for cursor resources"><code class="xref py py-mod docutils literal notranslate"><span class="pre">cursors</span></code></a></p></td>
<td><p>load cursor images, includes standard cursors</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/display.html#module-pygame.display" title="pygame.display: pygame module to control the display window and screen"><code class="xref py py-mod docutils literal notranslate"><span class="pre">display</span></code></a></p></td>
<td><p>control the display window or screen</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/draw.html#module-pygame.draw" title="pygame.draw: pygame module for drawing shapes"><code class="xref py py-mod docutils literal notranslate"><span class="pre">draw</span></code></a></p></td>
<td><p>draw simple shapes onto a Surface</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/event.html#module-pygame.event" title="pygame.event: pygame module for interacting with events and queues"><code class="xref py py-mod docutils literal notranslate"><span class="pre">event</span></code></a></p></td>
<td><p>manage events and the event queue</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/font.html#module-pygame.font" title="pygame.font: pygame module for loading and rendering fonts"><code class="xref py py-mod docutils literal notranslate"><span class="pre">font</span></code></a></p></td>
<td><p>create and render TrueType fonts</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/image.html#module-pygame.image" title="pygame.image: pygame module for loading and saving images"><code class="xref py py-mod docutils literal notranslate"><span class="pre">image</span></code></a></p></td>
<td><p>save and load images</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/joystick.html#module-pygame.joystick" title="pygame.joystick: Pygame module for interacting with joysticks, gamepads, and trackballs."><code class="xref py py-mod docutils literal notranslate"><span class="pre">joystick</span></code></a></p></td>
<td><p>manage joystick devices</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/key.html#module-pygame.key" title="pygame.key: pygame module to work with the keyboard"><code class="xref py py-mod docutils literal notranslate"><span class="pre">key</span></code></a></p></td>
<td><p>manage the keyboard</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/mouse.html#module-pygame.mouse" title="pygame.mouse: pygame module to work with the mouse"><code class="xref py py-mod docutils literal notranslate"><span class="pre">mouse</span></code></a></p></td>
<td><p>manage the mouse</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/sndarray.html#module-pygame.sndarray" title="pygame.sndarray: pygame module for accessing sound sample data"><code class="xref py py-mod docutils literal notranslate"><span class="pre">sndarray</span></code></a></p></td>
<td><p>manipulate sounds with numpy</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/surfarray.html#module-pygame.surfarray" title="pygame.surfarray: pygame module for accessing surface pixel data using array interfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">surfarray</span></code></a></p></td>
<td><p>manipulate images with numpy</p></td>
</tr>
<tr class="row-odd"><td><p><a class="reference internal" href="../ref/time.html#module-pygame.time" title="pygame.time: pygame module for monitoring time"><code class="xref py py-mod docutils literal notranslate"><span class="pre">time</span></code></a></p></td>
<td><p>control timing</p></td>
</tr>
<tr class="row-even"><td><p><a class="reference internal" href="../ref/transform.html#module-pygame.transform" title="pygame.transform: pygame module to transform surfaces"><code class="xref py py-mod docutils literal notranslate"><span class="pre">transform</span></code></a></p></td>
<td><p>scale, rotate, and flip images</p></td>
</tr>
</tbody>
</table>
</section>
</section>
</section>
</section>
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