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</pre><pre class="rust"><code><span class="attribute">#![<span class="ident">allow</span>(<span class="ident">clippy::new_without_default</span>)]</span>

<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">anyhow</span>;

<span class="kw">use</span> <span class="ident">serde</span>::{<span class="ident">Deserialize</span>, <span class="ident">Deserializer</span>, <span class="ident">Serialize</span>, <span class="ident">Serializer</span>};

<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::angle::Angle</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::bounds</span>::{<span class="ident">Bounds</span>, <span class="ident">GPSBounds</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::circle::Circle</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::distance::Distance</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::duration::Duration</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::find_closest::FindClosest</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::gps::LonLat</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::line</span>::{<span class="ident">InfiniteLine</span>, <span class="ident">Line</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::percent::Percent</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::polygon</span>::{<span class="ident">Polygon</span>, <span class="ident">Triangle</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::polyline</span>::{<span class="ident">ArrowCap</span>, <span class="ident">PolyLine</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::pt</span>::{<span class="ident">HashablePt2D</span>, <span class="ident">Pt2D</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::ring::Ring</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::speed::Speed</span>;
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::stats</span>::{<span class="ident">HgramValue</span>, <span class="ident">Histogram</span>, <span class="ident">Statistic</span>};
<span class="kw">pub</span> <span class="kw">use</span> <span class="ident"><span class="kw">crate</span>::time::Time</span>;

<span class="kw">mod</span> <span class="ident">angle</span>;
<span class="kw">mod</span> <span class="ident">bounds</span>;
<span class="kw">mod</span> <span class="ident">circle</span>;
<span class="kw">mod</span> <span class="ident">conversions</span>;
<span class="kw">mod</span> <span class="ident">distance</span>;
<span class="kw">mod</span> <span class="ident">duration</span>;
<span class="kw">mod</span> <span class="ident">find_closest</span>;
<span class="kw">mod</span> <span class="ident">gps</span>;
<span class="kw">mod</span> <span class="ident">line</span>;
<span class="kw">mod</span> <span class="ident">percent</span>;
<span class="kw">mod</span> <span class="ident">polygon</span>;
<span class="kw">mod</span> <span class="ident">polyline</span>;
<span class="kw">mod</span> <span class="ident">pt</span>;
<span class="kw">mod</span> <span class="ident">ring</span>;
<span class="kw">mod</span> <span class="ident">speed</span>;
<span class="kw">mod</span> <span class="ident">stats</span>;
<span class="kw">mod</span> <span class="ident">time</span>;

<span class="comment">// About 0.4 inches... which is quite tiny on the scale of things. :)</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">EPSILON_DIST</span>: <span class="ident">Distance</span> <span class="op">=</span> <span class="ident">Distance::const_meters</span>(<span class="number">0.01</span>);

<span class="doccomment">/// Reduce the precision of an f64. This helps ensure serialization is idempotent (everything is</span>
<span class="doccomment">/// exacly the same before and after saving/loading). Ideally we&#39;d use some kind of proper</span>
<span class="doccomment">/// fixed-precision type instead of f64.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">trim_f64</span>(<span class="ident">x</span>: <span class="ident">f64</span>) -&gt; <span class="ident">f64</span> {
    (<span class="ident">x</span> <span class="op">*</span> <span class="number">10_000.0</span>).<span class="ident">round</span>() <span class="op">/</span> <span class="number">10_000.0</span>
}

<span class="doccomment">/// Serializes a trimmed `f64` as an `i32` to save space.</span>
<span class="kw">fn</span> <span class="ident">serialize_f64</span><span class="op">&lt;</span><span class="ident">S</span>: <span class="ident">Serializer</span><span class="op">&gt;</span>(<span class="ident">x</span>: <span class="kw-2">&amp;</span><span class="ident">f64</span>, <span class="ident">s</span>: <span class="ident">S</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">S::Ok</span>, <span class="ident">S::Error</span><span class="op">&gt;</span> {
    <span class="comment">// So a trimmed f64&#39;s range becomes 2**31 / 10,000 =~ 214,000, which is plenty</span>
    <span class="comment">// We don&#39;t need to round() here; trim_f64 already handles that.</span>
    <span class="kw">let</span> <span class="ident">int</span> <span class="op">=</span> (<span class="ident">x</span> <span class="op">*</span> <span class="number">10_000.0</span>) <span class="kw">as</span> <span class="ident">i32</span>;
    <span class="ident">int</span>.<span class="ident">serialize</span>(<span class="ident">s</span>)
}

<span class="doccomment">/// Deserializes a trimmed `f64` from an `i32`.</span>
<span class="kw">fn</span> <span class="ident">deserialize_f64</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span>, <span class="ident">D</span>: <span class="ident">Deserializer</span><span class="op">&lt;</span><span class="lifetime">&#39;de</span><span class="op">&gt;</span><span class="op">&gt;</span>(<span class="ident">d</span>: <span class="ident">D</span>) -&gt; <span class="prelude-ty">Result</span><span class="op">&lt;</span><span class="ident">f64</span>, <span class="ident">D::Error</span><span class="op">&gt;</span> {
    <span class="kw">let</span> <span class="ident">x</span> <span class="op">=</span> <span class="op">&lt;</span><span class="ident">i32</span><span class="op">&gt;</span><span class="ident">::deserialize</span>(<span class="ident">d</span>)<span class="question-mark">?</span>;
    <span class="prelude-val">Ok</span>(<span class="ident">x</span> <span class="kw">as</span> <span class="ident">f64</span> <span class="op">/</span> <span class="number">10_000.0</span>)
}

<span class="doccomment">/// Specifies how to stringify different geom objects.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Serialize</span>, <span class="ident">Deserialize</span>, <span class="ident">Copy</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">UnitFmt</span> {
    <span class="doccomment">/// Round `Duration`s to a whole number of seconds.</span>
    <span class="kw">pub</span> <span class="ident">round_durations</span>: <span class="ident">bool</span>,
    <span class="doccomment">/// Display in metric; US imperial otherwise.</span>
    <span class="kw">pub</span> <span class="ident">metric</span>: <span class="ident">bool</span>,
}

<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Copy</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">CornerRadii</span> {
    <span class="kw">pub</span> <span class="ident">top_left</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">top_right</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">bottom_right</span>: <span class="ident">f64</span>,
    <span class="kw">pub</span> <span class="ident">bottom_left</span>: <span class="ident">f64</span>,
}

<span class="kw">impl</span> <span class="ident">CornerRadii</span> {
    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">uniform</span>(<span class="ident">radius</span>: <span class="ident">f64</span>) -&gt; <span class="self">Self</span> {
        <span class="self">Self</span> {
            <span class="ident">top_left</span>: <span class="ident">radius</span>,
            <span class="ident">top_right</span>: <span class="ident">radius</span>,
            <span class="ident">bottom_right</span>: <span class="ident">radius</span>,
            <span class="ident">bottom_left</span>: <span class="ident">radius</span>,
        }
    }

    <span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zero</span>() -&gt; <span class="self">Self</span> {
        <span class="ident"><span class="self">Self</span>::uniform</span>(<span class="number">0.0</span>)
    }
}

<span class="kw">impl</span> <span class="ident">std::convert::From</span><span class="op">&lt;</span><span class="ident">f64</span><span class="op">&gt;</span> <span class="kw">for</span> <span class="ident">CornerRadii</span> {
    <span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">uniform</span>: <span class="ident">f64</span>) -&gt; <span class="self">Self</span> {
        <span class="ident"><span class="self">Self</span>::uniform</span>(<span class="ident">uniform</span>)
    }
}

<span class="kw">impl</span> <span class="ident">Default</span> <span class="kw">for</span> <span class="ident">CornerRadii</span> {
    <span class="kw">fn</span> <span class="ident">default</span>() -&gt; <span class="self">Self</span> {
        <span class="ident"><span class="self">Self</span>::zero</span>()
    }
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="ident">rand</span>::{<span class="ident">Rng</span>, <span class="ident">SeedableRng</span>};

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">f64_trimming</span>() {
        <span class="comment">// Roundtrip a bunch of random f64&#39;s</span>
        <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rng</span> <span class="op">=</span> <span class="ident">rand_xorshift::XorShiftRng::seed_from_u64</span>(<span class="number">42</span>);
        <span class="kw">for</span> <span class="kw">_</span> <span class="kw">in</span> <span class="number">0</span>..<span class="number">1_000</span> {
            <span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="ident">rng</span>.<span class="ident">gen_range</span>(<span class="op">-</span><span class="number">214_000.00</span>..<span class="number">214_000.0</span>);
            <span class="kw">let</span> <span class="ident">trimmed</span> <span class="op">=</span> <span class="ident">trim_f64</span>(<span class="ident">input</span>);
            <span class="kw">let</span> <span class="ident">json_roundtrip</span>: <span class="ident">f64</span> <span class="op">=</span>
                <span class="ident">abstutil::from_json</span>(<span class="ident">abstutil::to_json</span>(<span class="kw-2">&amp;</span><span class="ident">trimmed</span>).<span class="ident">as_bytes</span>()).<span class="ident">unwrap</span>();
            <span class="kw">let</span> <span class="ident">bincode_roundtrip</span>: <span class="ident">f64</span> <span class="op">=</span>
                <span class="ident">abstutil::from_binary</span>(<span class="kw-2">&amp;</span><span class="ident">abstutil::to_binary</span>(<span class="kw-2">&amp;</span><span class="ident">trimmed</span>)).<span class="ident">unwrap</span>();
            <span class="macro">assert_eq!</span>(<span class="ident">json_roundtrip</span>, <span class="ident">trimmed</span>);
            <span class="macro">assert_eq!</span>(<span class="ident">bincode_roundtrip</span>, <span class="ident">trimmed</span>);
        }

        <span class="comment">// Hardcode a particular case, where we can hand-verify that it trims to 4 decimal places</span>
        <span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="number">1.2345678</span>;
        <span class="kw">let</span> <span class="ident">trimmed</span> <span class="op">=</span> <span class="ident">trim_f64</span>(<span class="ident">input</span>);
        <span class="kw">let</span> <span class="ident">json_roundtrip</span>: <span class="ident">f64</span> <span class="op">=</span>
            <span class="ident">abstutil::from_json</span>(<span class="ident">abstutil::to_json</span>(<span class="kw-2">&amp;</span><span class="ident">trimmed</span>).<span class="ident">as_bytes</span>()).<span class="ident">unwrap</span>();
        <span class="kw">let</span> <span class="ident">bincode_roundtrip</span>: <span class="ident">f64</span> <span class="op">=</span> <span class="ident">abstutil::from_binary</span>(<span class="kw-2">&amp;</span><span class="ident">abstutil::to_binary</span>(<span class="kw-2">&amp;</span><span class="ident">trimmed</span>)).<span class="ident">unwrap</span>();
        <span class="macro">assert_eq!</span>(<span class="ident">json_roundtrip</span>, <span class="number">1.2346</span>);
        <span class="macro">assert_eq!</span>(<span class="ident">bincode_roundtrip</span>, <span class="number">1.2346</span>);
    }
}
</code></pre></div>
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