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A00_basic_engine1.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title></title>
<meta http-equiv="content-type" content="text/html; charset=latin1">
<style type="text/css">
td.linenos { background-color: #272822; padding-right: 10px; }
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<h2></h2>
<table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre> 1
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56</pre></div></td><td class="code"><div class="highlight"><pre><span class="c"># Filename: A00_basic_engine.py</span>
<span class="c"># Author: James D. Miller; Gustavus Adolphus College.</span>
<span class="kn">import</span> <span class="nn">time</span>
<span class="k">def</span> <span class="nf">render_airtrack</span><span class="p">(</span><span class="n">x_px</span><span class="p">,</span> <span class="n">x_left_edge_px</span><span class="p">,</span> <span class="n">x_right_edge_px</span><span class="p">):</span>
<span class="n">string</span> <span class="o">=</span> <span class="s">''</span>
<span class="n">display_width_px</span> <span class="o">=</span> <span class="mi">125</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="mi">0</span><span class="p">,</span> <span class="n">display_width_px</span> <span class="o">+</span> <span class="mi">1</span><span class="p">):</span>
<span class="k">if</span> <span class="p">(</span><span class="n">j</span> <span class="o">==</span> <span class="n">x_px</span><span class="p">):</span>
<span class="n">string</span> <span class="o">+=</span> <span class="s">'*'</span>
<span class="k">elif</span> <span class="p">(</span><span class="n">j</span><span class="o">==</span><span class="n">x_left_edge_px</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">j</span><span class="o">==</span><span class="n">x_right_edge_px</span><span class="p">):</span>
<span class="n">string</span> <span class="o">+=</span> <span class="s">'|'</span>
<span class="k">else</span><span class="p">:</span>
<span class="n">string</span> <span class="o">+=</span> <span class="s">' '</span>
<span class="k">return</span> <span class="n">string</span>
<span class="k">def</span> <span class="nf">m_to_px</span><span class="p">(</span><span class="n">x_m</span><span class="p">):</span>
<span class="k">return</span> <span class="nb">int</span><span class="p">(</span><span class="nb">round</span><span class="p">(</span> <span class="n">x_m</span> <span class="o">*</span> <span class="mf">7.0</span><span class="p">))</span> <span class="c"># 5 pixels per meter.</span>
<span class="k">def</span> <span class="nf">x_fix_sticky</span><span class="p">(</span> <span class="n">x_m</span><span class="p">,</span> <span class="n">x_left_edge_m</span><span class="p">,</span> <span class="n">x_right_edge_m</span><span class="p">):</span>
<span class="c"># Simple stickiness correction. Move it back by the amount of the overlap.</span>
<span class="k">if</span> <span class="p">(</span><span class="n">x_m</span> <span class="o"><</span> <span class="n">x_left_edge_m</span><span class="p">):</span>
<span class="n">x_m</span> <span class="o">=</span> <span class="n">x_left_edge_m</span> <span class="c">#+= 2 * (x_left_edge_m - x_m)</span>
<span class="k">elif</span> <span class="p">(</span><span class="n">x_m</span> <span class="o">></span> <span class="n">x_right_edge_m</span><span class="p">):</span>
<span class="n">x_m</span> <span class="o">=</span> <span class="n">x_right_edge_m</span> <span class="c">#-= 2 * (x_m - x_right_edge_m)</span>
<span class="k">return</span> <span class="n">x_m</span>
<span class="k">def</span> <span class="nf">main</span><span class="p">():</span>
<span class="n">x_left_edge_m</span> <span class="o">=</span> <span class="mf">1.5</span>
<span class="n">x_right_edge_m</span> <span class="o">=</span> <span class="mf">17.5</span>
<span class="n">dt_s</span> <span class="o">=</span> <span class="mf">0.015</span>
<span class="n">x_m</span> <span class="o">=</span> <span class="mf">11.0</span>
<span class="n">v_mps</span> <span class="o">=</span> <span class="mf">17.0</span> <span class="c"># 20/5 for stickiness</span>
<span class="n">a_mps2</span> <span class="o">=</span> <span class="o">-</span><span class="mf">2.0</span> <span class="c"># -10/5 for stickiness</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="mi">5000</span><span class="p">):</span>
<span class="k">try</span><span class="p">:</span>
<span class="c"># Update the velocity and position.</span>
<span class="n">v_mps</span> <span class="o">+=</span> <span class="n">a_mps2</span> <span class="o">*</span> <span class="n">dt_s</span>
<span class="n">x_m</span> <span class="o">+=</span> <span class="n">v_mps</span> <span class="o">*</span> <span class="n">dt_s</span>
<span class="c"># Check for wall collisions.</span>
<span class="k">if</span> <span class="p">(</span><span class="n">x_m</span> <span class="o"><</span> <span class="n">x_left_edge_m</span><span class="p">)</span> <span class="ow">or</span> <span class="p">(</span><span class="n">x_m</span> <span class="o">></span> <span class="n">x_right_edge_m</span><span class="p">):</span>
<span class="n">v_mps</span> <span class="o">*=</span> <span class="o">-</span><span class="mi">1</span> <span class="o">*</span> <span class="mf">0.80</span> <span class="c"># loss of 20% on each bounce.</span>
<span class="n">x_m</span> <span class="o">=</span> <span class="n">x_fix_sticky</span><span class="p">(</span> <span class="n">x_m</span><span class="p">,</span> <span class="n">x_left_edge_m</span><span class="p">,</span> <span class="n">x_right_edge_m</span><span class="p">)</span>
<span class="n">display_string</span> <span class="o">=</span> <span class="n">render_airtrack</span><span class="p">(</span> <span class="n">m_to_px</span><span class="p">(</span> <span class="n">x_m</span><span class="p">),</span> <span class="n">m_to_px</span><span class="p">(</span> <span class="n">x_left_edge_m</span><span class="p">),</span> <span class="n">m_to_px</span><span class="p">(</span> <span class="n">x_right_edge_m</span><span class="p">))</span>
<span class="k">print</span> <span class="n">display_string</span> <span class="o">+</span> <span class="s">' x ='</span> <span class="o">+</span> <span class="s">"</span><span class="si">%.3f</span><span class="s">"</span> <span class="o">%</span> <span class="n">x_m</span> <span class="o">+</span> <span class="s">" "</span> <span class="o">+</span> <span class="s">' v = '</span> <span class="o">+</span> <span class="s">"</span><span class="si">%.1f</span><span class="s">"</span> <span class="o">%</span> <span class="n">v_mps</span>
<span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="n">dt_s</span><span class="p">)</span>
<span class="k">except</span><span class="p">:</span>
<span class="k">break</span>
<span class="n">main</span><span class="p">()</span>
</pre></div>
</td></tr></table></body>
</html>