Unable to backhatch for this structure

[tomyan112]

Describe the bug
A clear and concise description [in English] of what the bug is.

After select backhatch, it just turns into straight line

[MikeWilliams-UK]

@tomyan112 please can you paste the cml

[tomyan112]

<cml:cml xmlns:conventions="http://www.xml-cml.org/convention/" xmlns:cml="http://www.xml-cml.org/schema" xmlns:cmlDict="http://www.xml-cml.org/dictionary/cml/" xmlns:nameDict="http://www.xml-cml.org/dictionary/cml/name/" xmlns:c4w="http://www.chem4word.com/cml" conventions="convention:molecular">
  <cml:molecule id="m1">
    <cml:atomArray>
      <cml:atom id="a1" elementType="C" x2="478.3495" y2="400" />
      <cml:atom id="a2" elementType="C" x2="500.0001" y2="387.5" />
      <cml:atom id="a3" elementType="C" x2="456.6988" y2="387.5" />
      <cml:atom id="a4" elementType="C" x2="521.6507" y2="400" />
      <cml:atom id="a5" elementType="C" x2="500.0001" y2="362.5" />
      <cml:atom id="a6" elementType="H" x2="500.0001" y2="412.5" />
      <cml:atom id="a7" elementType="C" x2="456.6988" y2="362.5" />
      <cml:atom id="a8" elementType="C" x2="543.3013" y2="387.5" />
      <cml:atom id="a9" elementType="O" x2="521.6507" y2="425" />
      <cml:atom id="a10" elementType="C" x2="521.6507" y2="350" />
      <cml:atom id="a11" elementType="C" x2="478.3495" y2="350" />
      <cml:atom id="a12" elementType="H" x2="500.0001" y2="337.5" />
      <cml:atom id="a13" elementType="C" x2="543.3013" y2="362.5" />
      <cml:atom id="a14" elementType="O" x2="521.6507" y2="325" />
      <cml:atom id="a15" elementType="C" x2="478.3495" y2="375" c4w:explicit="false" />
    </cml:atomArray>
    <cml:bondArray>
      <cml:bond id="b1" atomRefs2="a2 a1" order="S" />
      <cml:bond id="b2" atomRefs2="a1 a3" order="S" />
      <cml:bond id="b3" atomRefs2="a4 a2" order="S" />
      <cml:bond id="b4" atomRefs2="a2 a5" order="S" />
      <cml:bond id="b5" atomRefs2="a2 a6" order="S">
        <cml:bondStereo atomRefs2="a2 a6">W</cml:bondStereo>
      </cml:bond>
      <cml:bond id="b6" atomRefs2="a3 a7" order="D" />
      <cml:bond id="b7" atomRefs2="a8 a4" order="S" />
      <cml:bond id="b8" atomRefs2="a4 a9" order="D" />
      <cml:bond id="b9" atomRefs2="a5 a10" order="S" />
      <cml:bond id="b10" atomRefs2="a11 a5" order="S" />
      <cml:bond id="b11" atomRefs2="a5 a12" order="S">
        <cml:bondStereo atomRefs2="a5 a12">W</cml:bondStereo>
      </cml:bond>
      <cml:bond id="b12" atomRefs2="a7 a11" order="S" />
      <cml:bond id="b13" atomRefs2="a13 a8" order="D" />
      <cml:bond id="b14" atomRefs2="a10 a13" order="S" />
      <cml:bond id="b15" atomRefs2="a10 a14" order="D" />
      <cml:bond id="b16" atomRefs2="a1 a15" order="S">
        <cml:bondStereo atomRefs2="a1 a15">W</cml:bondStereo>
      </cml:bond>
      <cml:bond id="b17" atomRefs2="a11 a15" order="S">
        <cml:bondStereo atomRefs2="a11 a15">W</cml:bondStereo>
      </cml:bond>
    </cml:bondArray>
  </cml:molecule>
</cml:cml>

Edited to mark as xml and remove irrelevant labels

[MikeWilliams-UK]

@deadlyvices I think I have figured this one out.

Points to note

• Atom a15 has explicit = false == Don't display Carbon label.
• Bonds b16 and b17 both have bondStereo = W == Wedge, but are not showing as such.

If I edit the structure to move atom a15 such that bonds b16 and b17 are no longer in a straight line the wedges are rendered.

To prevent this we need to only apply chamfer when the angle is approx 120° (as in the paper "Rendering Molecular Sketches for Publication Quality
Output")

When the endpoint of an inclined wedge is an unlabelled carbon atom with one substituent with an interior angle of approximately 120°

[deadlyvices]

Well done on tracking that one down. I suggest we both try to fix it together. It would affect both in-document and real-time rendering.
So what angle range corresponds to 'approximately 120'? 110 -130?

[MikeWilliams-UK]

@deadlyvices I agree that +- 10 is a good range to use.

[MikeWilliams-UK]

@tomyan112 this is how the above structure now renders in word and in ACME

As you can see the "hidden" wedges for bonds b16 and b17 are now showing correctly.

[MikeWilliams-UK]

Related to #72