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A16a_BodyTypes.html
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<h2></h2>
<div class="highlight"><pre><span></span><span class="c1"># Filename: A16a_BodyTypes.py</span>
<span class="c1"># Written by: James D. Miller</span>
<span class="c1"># This file is based on the test_BodyTypes.py file in the examples directory of the </span>
<span class="c1"># pybox2d distribution. This depends on the pygame framework in that distribution so </span>
<span class="c1"># all the framework files must be in the same directory as this file.</span>
<span class="c1">#!/usr/bin/env python</span>
<span class="c1"># -*- coding: utf-8 -*-</span>
<span class="c1">#</span>
<span class="c1"># C++ version Copyright (c) 2006-2007 Erin Catto http://www.box2d.org</span>
<span class="c1"># Python version by Ken Lauer / sirkne at gmail dot com</span>
<span class="c1"># </span>
<span class="c1"># This software is provided 'as-is', without any express or implied</span>
<span class="c1"># warranty. In no event will the authors be held liable for any damages</span>
<span class="c1"># arising from the use of this software.</span>
<span class="c1"># Permission is granted to anyone to use this software for any purpose,</span>
<span class="c1"># including commercial applications, and to alter it and redistribute it</span>
<span class="c1"># freely, subject to the following restrictions:</span>
<span class="c1"># 1. The origin of this software must not be misrepresented; you must not</span>
<span class="c1"># claim that you wrote the original software. If you use this software</span>
<span class="c1"># in a product, an acknowledgment in the product documentation would be</span>
<span class="c1"># appreciated but is not required.</span>
<span class="c1"># 2. Altered source versions must be plainly marked as such, and must not be</span>
<span class="c1"># misrepresented as being the original software.</span>
<span class="c1"># 3. This notice may not be removed or altered from any source distribution.</span>
<span class="kn">from</span> <span class="nn">framework</span> <span class="kn">import</span> <span class="o">*</span>
<span class="kn">from</span> <span class="nn">math</span> <span class="kn">import</span> <span class="n">cos</span><span class="p">,</span> <span class="n">sin</span><span class="p">,</span> <span class="n">pi</span>
<span class="k">class</span> <span class="nc">BodyTypes</span> <span class="p">(</span><span class="n">Framework</span><span class="p">):</span>
<span class="n">name</span><span class="o">=</span><span class="s2">"Body Types, Guns, and Slingshot."</span>
<span class="n">description</span><span class="o">=</span><span class="s2">"Change body type keys: (d)dynamic, (s)static, (k)kinematic.</span><span class="se">\n</span><span class="s2">(p)pyramid, (l)load, (c)circle.</span><span class="se">\n</span><span class="s2">Shoot gun: g or b. b has variable speed based on mouse string.</span><span class="se">\n</span><span class="s2">Slingshot: shift and mouse drag."</span>
<span class="n">speed</span> <span class="o">=</span> <span class="mi">3</span> <span class="c1"># platform speed</span>
<span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">BodyTypes</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="fm">__init__</span><span class="p">()</span>
<span class="bp">self</span><span class="o">.</span><span class="n">time</span> <span class="o">=</span> <span class="mi">0</span>
<span class="c1"># A list for keeping track of the age of the bullets.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bullet_list</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># Collision masking (also see test_CollisionFiltering.py)</span>
<span class="c1"># This positive (+5) non_bullets group index insures collisions in this group. </span>
<span class="bp">self</span><span class="o">.</span><span class="n">non_bullets</span> <span class="o">=</span> <span class="mi">5</span>
<span class="c1"># Categories</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gunCategory</span> <span class="o">=</span> <span class="mh">0x0002</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bulletCategory</span> <span class="o">=</span> <span class="mh">0x0004</span>
<span class="c1"># Masks</span>
<span class="bp">self</span><span class="o">.</span><span class="n">gunMask</span> <span class="o">=</span> <span class="mh">0xFFFF</span>
<span class="c1"># An exclusive OR to keep bullets from colliding with the gun parts.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bulletMask</span> <span class="o">=</span> <span class="mh">0xFFFF</span> <span class="o">^</span> <span class="bp">self</span><span class="o">.</span><span class="n">gunCategory</span>
<span class="c1"># The ground</span>
<span class="n">ground</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateBody</span><span class="p">(</span>
<span class="n">shapes</span><span class="o">=</span><span class="n">b2EdgeShape</span><span class="p">(</span><span class="n">vertices</span><span class="o">=</span><span class="p">[(</span><span class="o">-</span><span class="mi">30</span><span class="p">,</span><span class="mi">0</span><span class="p">),(</span><span class="mi">30</span><span class="p">,</span><span class="mi">0</span><span class="p">)])</span>
<span class="p">)</span>
<span class="c1"># The attachment</span>
<span class="n">attachment_fixture</span> <span class="o">=</span> <span class="n">b2FixtureDef</span><span class="p">(</span>
<span class="n">shape</span><span class="o">=</span><span class="n">b2PolygonShape</span><span class="p">(</span><span class="n">box</span><span class="o">=</span><span class="p">(</span><span class="mf">0.5</span><span class="p">,</span><span class="mi">2</span><span class="p">)),</span>
<span class="n">density</span><span class="o">=</span><span class="mf">2.0</span><span class="p">,</span>
<span class="nb">filter</span> <span class="o">=</span> <span class="n">b2Filter</span><span class="p">(</span>
<span class="n">groupIndex</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">non_bullets</span><span class="p">,</span>
<span class="n">categoryBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gunCategory</span><span class="p">,</span>
<span class="n">maskBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gunMask</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">attachment</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">3</span><span class="p">),</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">attachment_fixture</span><span class="p">,</span>
<span class="p">)</span>
<span class="c1"># The platform</span>
<span class="n">fixture</span><span class="o">=</span><span class="n">b2FixtureDef</span><span class="p">(</span>
<span class="n">shape</span><span class="o">=</span><span class="n">b2PolygonShape</span><span class="p">(</span><span class="n">box</span><span class="o">=</span><span class="p">(</span><span class="mi">4</span><span class="p">,</span><span class="mf">0.5</span><span class="p">)),</span>
<span class="n">density</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span>
<span class="n">friction</span><span class="o">=</span><span class="mf">0.6</span><span class="p">,</span>
<span class="nb">filter</span> <span class="o">=</span> <span class="n">b2Filter</span><span class="p">(</span>
<span class="n">groupIndex</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">non_bullets</span><span class="p">,</span>
<span class="n">categoryBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gunCategory</span><span class="p">,</span>
<span class="n">maskBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">gunMask</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">),</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">fixture</span><span class="p">,</span>
<span class="p">)</span>
<span class="c1"># The joints joining the attachment/platform and ground/platform</span>
<span class="bp">self</span><span class="o">.</span><span class="n">RJ</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateRevoluteJoint</span><span class="p">(</span>
<span class="n">bodyA</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">attachment</span><span class="p">,</span>
<span class="n">bodyB</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="p">,</span>
<span class="n">anchor</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">),</span>
<span class="n">maxMotorTorque</span><span class="o">=</span><span class="mi">50</span><span class="p">,</span>
<span class="n">enableMotor</span><span class="o">=</span><span class="kc">True</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">PJ</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreatePrismaticJoint</span><span class="p">(</span>
<span class="n">bodyA</span><span class="o">=</span><span class="n">ground</span><span class="p">,</span>
<span class="n">bodyB</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="p">,</span>
<span class="n">anchor</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">5</span><span class="p">),</span>
<span class="n">axis</span><span class="o">=</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="mi">0</span><span class="p">),</span>
<span class="n">maxMotorForce</span> <span class="o">=</span> <span class="mi">1000</span><span class="p">,</span>
<span class="n">enableMotor</span> <span class="o">=</span> <span class="kc">True</span><span class="p">,</span>
<span class="n">lowerTranslation</span> <span class="o">=</span> <span class="o">-</span><span class="mi">10</span><span class="p">,</span>
<span class="n">upperTranslation</span> <span class="o">=</span> <span class="mi">10</span><span class="p">,</span>
<span class="n">enableLimit</span> <span class="o">=</span> <span class="kc">True</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">newpayload</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># And the payload that initially sits upon the platform in the original demo.</span>
<span class="c1"># Reusing the fixture we previously defined above.</span>
<span class="n">payload_fixture</span><span class="o">=</span><span class="n">b2FixtureDef</span><span class="p">(</span>
<span class="n">shape</span><span class="o">=</span><span class="n">b2PolygonShape</span><span class="p">(</span><span class="n">box</span><span class="o">=</span><span class="p">(</span><span class="mf">0.75</span><span class="p">,</span> <span class="mf">0.75</span><span class="p">)),</span>
<span class="n">density</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span>
<span class="n">friction</span><span class="o">=</span><span class="mf">0.6</span><span class="p">,</span>
<span class="nb">filter</span> <span class="o">=</span> <span class="n">b2Filter</span><span class="p">(</span>
<span class="n">groupIndex</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">non_bullets</span><span class="p">,</span>
<span class="n">categoryBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletCategory</span><span class="p">,</span>
<span class="n">maskBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletMask</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">payload</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">8</span><span class="p">),</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">payload_fixture</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">newCircle</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># Some circles for testing contact normals.</span>
<span class="n">circle_fixture</span><span class="o">=</span><span class="n">b2FixtureDef</span><span class="p">(</span>
<span class="n">shape</span><span class="o">=</span><span class="n">b2CircleShape</span><span class="p">(</span><span class="n">radius</span><span class="o">=</span><span class="mf">2.0</span><span class="p">),</span>
<span class="n">density</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span>
<span class="n">friction</span><span class="o">=</span><span class="mf">0.6</span><span class="p">,</span>
<span class="nb">filter</span> <span class="o">=</span> <span class="n">b2Filter</span><span class="p">(</span>
<span class="n">groupIndex</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">non_bullets</span><span class="p">,</span>
<span class="n">categoryBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletCategory</span><span class="p">,</span>
<span class="n">maskBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletMask</span>
<span class="p">)</span>
<span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">circle</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">8</span><span class="p">),</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">circle_fixture</span><span class="p">,</span>
<span class="p">)</span>
<span class="k">def</span> <span class="nf">newpyramid</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="c1"># Pyramid on the ground </span>
<span class="n">box_half_size</span> <span class="o">=</span> <span class="p">(</span><span class="mf">0.5</span><span class="p">,</span> <span class="mf">0.5</span><span class="p">)</span>
<span class="n">box_density</span> <span class="o">=</span> <span class="mf">5.0</span>
<span class="n">box_rows</span> <span class="o">=</span> <span class="mi">20</span>
<span class="n">x</span><span class="o">=</span><span class="n">b2Vec2</span><span class="p">(</span><span class="o">-</span><span class="mi">27</span><span class="p">,</span> <span class="mf">0.75</span><span class="p">)</span>
<span class="n">deltaX</span><span class="o">=</span><span class="p">(</span><span class="mf">0.5625</span><span class="p">,</span> <span class="mf">1.25</span><span class="p">)</span>
<span class="n">deltaY</span><span class="o">=</span><span class="p">(</span><span class="mf">1.125</span><span class="p">,</span> <span class="mi">0</span><span class="p">)</span>
<span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">box_rows</span><span class="p">):</span>
<span class="n">y</span> <span class="o">=</span> <span class="n">x</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span>
<span class="k">for</span> <span class="n">j</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="n">i</span><span class="p">,</span> <span class="n">box_rows</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="n">y</span><span class="p">,</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">b2FixtureDef</span><span class="p">(</span>
<span class="n">shape</span><span class="o">=</span><span class="n">b2PolygonShape</span><span class="p">(</span><span class="n">box</span><span class="o">=</span><span class="n">box_half_size</span><span class="p">),</span>
<span class="n">density</span><span class="o">=</span><span class="n">box_density</span><span class="p">)</span>
<span class="p">)</span>
<span class="n">y</span> <span class="o">+=</span> <span class="n">deltaY</span>
<span class="n">x</span> <span class="o">+=</span> <span class="n">deltaX</span>
<span class="k">def</span> <span class="nf">newbullet</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">location_init</span><span class="p">,</span> <span class="n">angle_radians_init</span><span class="p">,</span> <span class="n">speed_control</span><span class="p">):</span>
<span class="c1"># Speed</span>
<span class="n">v</span> <span class="o">=</span> <span class="mi">30</span>
<span class="c1"># Note: angle_degrees = angle_radians_init * 180/pi</span>
<span class="c1"># Scale the bullet speed by the length of the mouse vector.</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">mouseJoint</span> <span class="ow">and</span> <span class="p">(</span><span class="n">speed_control</span> <span class="o">==</span> <span class="s2">"on"</span><span class="p">):</span>
<span class="n">joint_vector</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">mouseJoint</span><span class="o">.</span><span class="n">anchorB</span> <span class="o">-</span> <span class="bp">self</span><span class="o">.</span><span class="n">mouseJoint</span><span class="o">.</span><span class="n">target</span>
<span class="n">joint_vector_length</span> <span class="o">=</span> <span class="p">(</span><span class="n">joint_vector</span><span class="o">.</span><span class="n">x</span><span class="o">**</span><span class="mi">2</span> <span class="o">+</span> <span class="n">joint_vector</span><span class="o">.</span><span class="n">y</span><span class="o">**</span><span class="mi">2</span><span class="p">)</span><span class="o">**</span><span class="mf">0.5</span>
<span class="c1">#print joint_vector_length</span>
<span class="n">v</span> <span class="o">=</span> <span class="n">v</span> <span class="o">*</span> <span class="n">joint_vector_length</span><span class="o">/</span><span class="mf">2.0</span> <span class="c1"># Cut this by a factor of 2...</span>
<span class="n">v_x</span> <span class="o">=</span> <span class="n">v</span> <span class="o">*</span> <span class="n">cos</span><span class="p">(</span><span class="n">pi</span><span class="o">/</span><span class="mi">2</span><span class="o">-</span> <span class="n">angle_radians_init</span><span class="p">)</span>
<span class="n">v_y</span> <span class="o">=</span> <span class="n">v</span> <span class="o">*</span> <span class="n">sin</span><span class="p">(</span><span class="n">pi</span><span class="o">/</span><span class="mi">2</span><span class="o">-</span> <span class="n">angle_radians_init</span><span class="p">)</span>
<span class="n">bullet_fixture</span> <span class="o">=</span> <span class="n">b2FixtureDef</span><span class="p">(</span><span class="n">shape</span><span class="o">=</span><span class="n">b2PolygonShape</span><span class="p">(</span><span class="n">box</span><span class="o">=</span><span class="p">(</span><span class="mf">0.25</span><span class="p">,</span> <span class="mf">0.25</span><span class="p">)),</span> <span class="n">density</span><span class="o">=</span><span class="mf">100.0</span><span class="p">)</span> <span class="c1">#restitution=1.0</span>
<span class="n">bullet_fixture</span><span class="o">.</span><span class="n">filter</span><span class="o">.</span><span class="n">groupIndex</span> <span class="o">=</span> <span class="mi">0</span>
<span class="n">bullet_fixture</span><span class="o">.</span><span class="n">filter</span><span class="o">.</span><span class="n">categoryBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletCategory</span>
<span class="n">bullet_fixture</span><span class="o">.</span><span class="n">filter</span><span class="o">.</span><span class="n">maskBits</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bulletMask</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bullet</span><span class="o">=</span><span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">CreateDynamicBody</span><span class="p">(</span>
<span class="n">position</span><span class="o">=</span><span class="n">location_init</span><span class="p">,</span>
<span class="n">bullet</span><span class="o">=</span><span class="kc">True</span><span class="p">,</span>
<span class="n">fixtures</span><span class="o">=</span><span class="n">bullet_fixture</span><span class="p">,</span>
<span class="n">linearVelocity</span><span class="o">=</span><span class="p">(</span><span class="n">v_x</span><span class="p">,</span> <span class="n">v_y</span><span class="p">)</span>
<span class="p">)</span>
<span class="c1"># Put the bullet into a list for clean-up (deletion) later. Tag it with</span>
<span class="c1"># a birth-time stamp so can calculate age later.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bullet_list</span><span class="o">.</span><span class="n">append</span><span class="p">([</span><span class="bp">self</span><span class="o">.</span><span class="n">bullet</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">time</span><span class="p">])</span>
<span class="c1"># print "self.time =", self.time</span>
<span class="k">def</span> <span class="nf">Keyboard</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">):</span>
<span class="k">if</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_d</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">type</span><span class="o">=</span><span class="n">b2_dynamicBody</span>
<span class="k">elif</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_s</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">type</span><span class="o">=</span><span class="n">b2_staticBody</span>
<span class="k">elif</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_k</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">type</span><span class="o">=</span><span class="n">b2_kinematicBody</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">linearVelocity</span><span class="o">=</span><span class="p">(</span><span class="o">-</span><span class="bp">self</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="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">angularVelocity</span><span class="o">=</span><span class="mi">0</span>
<span class="k">elif</span> <span class="p">(</span><span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_g</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_b</span><span class="p">):</span>
<span class="k">if</span> <span class="p">(</span><span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_b</span><span class="p">):</span>
<span class="n">speed_control</span> <span class="o">=</span> <span class="s2">"on"</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">speed_control</span> <span class="o">=</span> <span class="s2">"off"</span>
<span class="n">bullet_angle_init</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">RJ</span><span class="o">.</span><span class="n">angle</span>
<span class="c1">#print "angle =", bullet_angle_init</span>
<span class="c1"># Get the world position of the tip (0,2) of the gun barrel.</span>
<span class="n">bullet_xy_init</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">attachment</span><span class="o">.</span><span class="n">transform</span> <span class="o">*</span> <span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mi">2</span><span class="p">)</span>
<span class="c1">#print "world point = ", bullet_xy_init</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newbullet</span><span class="p">(</span><span class="n">bullet_xy_init</span><span class="p">,</span> <span class="n">bullet_angle_init</span><span class="p">,</span> <span class="n">speed_control</span><span class="p">)</span>
<span class="k">elif</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_p</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newpyramid</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_l</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newpayload</span><span class="p">()</span>
<span class="k">elif</span> <span class="n">key</span><span class="o">==</span><span class="n">Keys</span><span class="o">.</span><span class="n">K_c</span><span class="p">:</span>
<span class="bp">self</span><span class="o">.</span><span class="n">newCircle</span><span class="p">()</span>
<span class="k">def</span> <span class="nf">Step</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">settings</span><span class="p">):</span>
<span class="nb">super</span><span class="p">(</span><span class="n">BodyTypes</span><span class="p">,</span> <span class="bp">self</span><span class="p">)</span><span class="o">.</span><span class="n">Step</span><span class="p">(</span><span class="n">settings</span><span class="p">)</span>
<span class="c1"># Move the platform if it's kinematic.</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">type</span><span class="o">==</span><span class="n">b2_kinematicBody</span><span class="p">:</span>
<span class="n">p</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">transform</span><span class="o">.</span><span class="n">position</span>
<span class="k">if</span> <span class="p">((</span><span class="n">p</span><span class="o">.</span><span class="n">x</span> <span class="o"><</span> <span class="o">-</span><span class="mi">10</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">p</span><span class="o">.</span><span class="n">x</span> <span class="o">></span> <span class="mi">10</span><span class="p">)):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">platform</span><span class="o">.</span><span class="n">linearVelocity</span> <span class="o">*=</span> <span class="o">-</span><span class="mi">1</span>
<span class="c1"># Every step (or second if use commented value), check the age of each bullet in the list.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">time</span> <span class="o">+=</span> <span class="mf">1.0</span><span class="o">/</span><span class="mf">60.0</span>
<span class="k">if</span> <span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">stepCount</span> <span class="o">%</span> <span class="mi">1</span><span class="p">)</span><span class="o">==</span><span class="mi">0</span><span class="p">:</span> <span class="c1"># change the 1 to 60 to delay check to every second.</span>
<span class="c1">#print "--------------------", self.time, "--------------------"</span>
<span class="c1"># Copy the list so you are not deleting in the list used by the for loop.</span>
<span class="n">bullet_list_copy</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">bullet_list</span><span class="p">[:]</span>
<span class="k">for</span> <span class="n">bullet</span> <span class="ow">in</span> <span class="n">bullet_list_copy</span><span class="p">:</span>
<span class="n">bullet_age</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">time</span> <span class="o">-</span> <span class="n">bullet</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span>
<span class="k">if</span> <span class="p">(</span><span class="n">bullet_age</span><span class="p">)</span> <span class="o">></span> <span class="mf">10.0</span><span class="p">:</span>
<span class="c1">#print "age of bullet =", bullet_age</span>
<span class="c1"># Delete the bullet</span>
<span class="bp">self</span><span class="o">.</span><span class="n">world</span><span class="o">.</span><span class="n">DestroyBody</span><span class="p">(</span><span class="n">bullet</span><span class="p">[</span><span class="mi">0</span><span class="p">])</span>
<span class="c1"># Delete the sub-list element in the main list.</span>
<span class="bp">self</span><span class="o">.</span><span class="n">bullet_list</span><span class="o">.</span><span class="n">remove</span><span class="p">(</span><span class="n">bullet</span><span class="p">)</span>
<span class="c1"># Delete the copy of the list.</span>
<span class="k">del</span> <span class="n">bullet_list_copy</span>
<span class="k">if</span> <span class="vm">__name__</span><span class="o">==</span><span class="s2">"__main__"</span><span class="p">:</span>
<span class="n">main</span><span class="p">(</span><span class="n">BodyTypes</span><span class="p">)</span>
</pre></div>
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