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Fixed Gerber parser: Now buffers current path with previous tool on tool change.
2014-11-13 20:06:43 +00:00
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Gerber support for single quadrant arcs (G74).
2014-11-21 02:43:32 +00:00
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Fixed Gerber parser: Now buffers current path with previous tool on tool change.
2014-11-13 20:06:43 +00:00
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<h1>Active Bugs<a class="headerlink" href="#active-bugs" title="Permalink to this headline"></a></h1>
<div class="section" id="drill-number-parsing">
<h2>Drill number parsing<a class="headerlink" href="#drill-number-parsing" title="Permalink to this headline"></a></h2>
<p>The screenshot below show the problematic file:</p>
<img alt="_images/drill_parse_problem1.png" class="align-center" src="_images/drill_parse_problem1.png" />
<p>The file reads:</p>
<div class="highlight-python"><pre>G81
M48
METRIC
T1C00.127
T2C00.889
T3C00.900
T4C01.524
T5C01.600
T6C02.032
T7C02.540
%
T002
X03874Y08092
X03874Y23333
X06414Y08092
X06414Y23333
X08954Y08092
...
T007
X02664Y03518
X02664Y41618
X76324Y03518
X76324Y41618
...</pre>
</div>
<p>After scaling by 10.0:</p>
<img alt="_images/drill_parse_problem2.png" class="align-center" src="_images/drill_parse_problem2.png" />
<p>The code involved is:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="o">...</span>
<span class="bp">self</span><span class="o">.</span><span class="n">zeros</span> <span class="o">=</span> <span class="s">&quot;T&quot;</span>
<span class="o">...</span>
<span class="k">def</span> <span class="nf">parse_number</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">number_str</span><span class="p">):</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">zeros</span> <span class="o">==</span> <span class="s">&quot;L&quot;</span><span class="p">:</span>
<span class="n">match</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">leadingzeros_re</span><span class="o">.</span><span class="n">search</span><span class="p">(</span><span class="n">number_str</span><span class="p">)</span>
<span class="k">return</span> <span class="nb">float</span><span class="p">(</span><span class="n">number_str</span><span class="p">)</span><span class="o">/</span><span class="p">(</span><span class="mi">10</span><span class="o">**</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">match</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">2</span><span class="p">))</span><span class="o">-</span><span class="mi">2</span><span class="o">+</span><span class="nb">len</span><span class="p">(</span><span class="n">match</span><span class="o">.</span><span class="n">group</span><span class="p">(</span><span class="mi">1</span><span class="p">))))</span>
<span class="k">else</span><span class="p">:</span> <span class="c"># Trailing</span>
<span class="k">return</span> <span class="nb">float</span><span class="p">(</span><span class="n">number_str</span><span class="p">)</span><span class="o">/</span><span class="mi">10000</span>
</pre></div>
</div>
<p>The numbers are being divided by 10000. If &#8220;L&#8221; had been specified,
the following regex would have applied:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="c"># Parse coordinates</span>
<span class="bp">self</span><span class="o">.</span><span class="n">leadingzeros_re</span> <span class="o">=</span> <span class="n">re</span><span class="o">.</span><span class="n">compile</span><span class="p">(</span><span class="s">r&#39;^(0*)(\d*)&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p>Then the number 02664 would have been divided by 10**(4-2+1) = 10**3 = 1000,
which is what is desired.</p>
<p>Leading zeros weren&#8217;t specified, but www.excellon.com says:</p>
<blockquote>
<div>The CNC-7 uses leading zeros unless you specify
otherwise through a part program or the console.</div></blockquote>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The parser has been modified to default to leading
zeros.</p>
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Gerber support for single quadrant arcs (G74).
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Fixed Gerber parser: Now buffers current path with previous tool on tool change.
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Fixed Gerber parser: Now buffers current path with previous tool on tool change.
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