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Update utils to do linear transformation of polygons

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Brings in https://github.com/alphagov/notifications-utils/pull/889/files

At the moment, we are not doing any transformation of features before
applying geometric algorithms to them. This is, in effect, assuming that
the earth is flat.

This new version of utils implements the transformation of our polygons
to a Cartesian plane. In other words, it converts them from being
defined in spherical degrees to metres.

For the admin app this means we need to convert places where the code
expects things to be measured in degrees to work in metres instead.
This commit is contained in:
Chris Hill-Scott
2021-08-03 18:46:30 +01:00
parent 6b52735dac
commit 6cb326f153
16 changed files with 99 additions and 80 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
app/templates/views/broadcast/macros/area-map.html
View File

@@ -6,7 +6,7 @@
<polygon points="25 5, 45 25, 25 45, 5 25" stroke="#0B0B0C" stroke-width="2" fill="#96C6E2" />
</svg>
<span class="govuk-visually-hidden">
An area of {{ (broadcast_message.simple_polygons.estimated_area)|round_to_significant_figures(1)|format_thousands }} square miles&nbsp;
An area of {{ (broadcast_message.simple_polygons.estimated_area)|square_metres_to_square_miles|round_to_significant_figures(1)|format_thousands }} square miles&nbsp;
</span>
Will get
<span class="govuk-visually-hidden">
@@ -20,7 +20,7 @@
<polygon points="25 5, 45 25, 25 45, 5 25" stroke="#005ea5" stroke-opacity="1" stroke-width="2" stroke-linecap="square" stroke-linejoin="round" stroke-dasharray="4,7.5,5,7.5,8,8,5,8,7.5,8,5,8,7,8,5,8,4" fill="#2B8CC4" fill-opacity="0.15" />
</svg>
<span class="govuk-visually-hidden">
An extra area of {{ (broadcast_message.simple_polygons_with_bleed.estimated_area - broadcast_message.simple_polygons.estimated_area)|round_to_significant_figures(1)|format_thousands }} square miles is&nbsp;
An extra area of {{ (broadcast_message.simple_polygons_with_bleed.estimated_area - broadcast_message.simple_polygons.estimated_area)|square_metres_to_square_miles|round_to_significant_figures(1)|format_thousands }} square miles is&nbsp;
</span>
Likely to get
<span class="govuk-visually-hidden">