[QGIS-Developer] Need Help Programmatically Creating a New Composition

[Joshua Quesenberry]

All,

 

Issue #1

 

I’m trying to create a Composer Layout using Python and I’m having issues
with addComposerHtmlFrame. I currently have QGIS 2.16.2 installed so the API
documentation I’m finding online doesn’t always match up with what I’m
having to actually do. At this point when I add a Composer HTML Frame I see
the frame in the layout, but the HTML isn’t rendered, even if I click on
“Refresh HTML”.

 

I’ve tried a few variations of my code, here’s the current variation:

 

----------------------------------------------------------------------------
------------------

 

comp = self.iface.createNewComposer('Map_Layout')

c = comp.composition()

paper_w = 279.4

paper_h = 215.9 

c.setPaperSize(paper_w, paper_h)

c.setPlotStyle(QgsComposition.Print)

 

# Add Mag Decl / Datum Info

info1 = QgsComposerHtml(c, False)

info1.setContentMode(QgsComposerHtml.ManualHtml)

info1.setHtml('''Mag Decl: 8.16° W<br>

Horz. Datum: WGS84''')

frame1 = QgsComposerFrame(c, info1, 27., 195., 42., 12.)

frame1.setId('Info 1')

c.addComposerHtmlFrame(info1, frame1)

 

# Add Map Name / Scale / Print Date / Contour Interval Info

info2 = QgsComposerHtml(c, False)

info2.setContentMode(QgsComposerHtml.ManualHtml)

info2.setHtml('''<table>

<tr>

<td width="68%">

Map Name: STUART (VA)

</td>

<td>

Scale: 1 inch = 2,000 ft

</td>

</tr>

<tr>

<td>

Print Date: Thu Oct 17 07:34:36 2013

</td>

<td>

Contour Interval: 20 Feet

</td>

</tr>

</table>''')

frame2 = QgsComposerFrame(c, info2, 73., 193., 125., 15.)

frame2.setFrameEnabled(True)

frame2.setId('Info 2')

c.addComposerHtmlFrame(info2, frame2)

 

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------------------

 

The documentation says that the 2nd parameter to QgsComposerFrame needs to
be a QgsComposerMultiFrame. Since QgsComposerMultiFrame is an abstract class
the only two options I know to try are either setting this parameter to None
(variation 1) or setting it to the QgsComposerHtml item itself (variation
2), where the latter is what I’m doing above.

 

Are there any ideas why the contents of the QgsComposerHtml never appear?
Also, if I save my project, close QGIS, and then re-open QGIS and the
project, the QgsComposerHtml elements are missing.

 

Issue #2

 

Is there any way to create a new Composer without opening the Composer
window? I tried hiding the window after creating the new Composer, but that
just gave me a Composer window that was in a somewhat odd state.

 

Issue #3

 

What’s the recommended way to pull in magnetic declination? Is this possible
offline?

 

Thanks in advance!

 

Josh Q

 

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