[SoC] GSoC 2021 - Week-5 Report: A new render type On the fly Raster Calculator for QGIS

[Francesco Bursi]

Hello to everyone,

As the fifth week comes to an end I would like to share with you the improvments and the issues of this week of coding for the period from5th July - 11th July.
You can find in [1] the main wiki page of the project and in [2] the branch of the forked repo in which you can find all the change I'm doing.

Taks achieved during the week

  *   According to the defined syntax of the URI and after a meeting and some advices from mentors I changed the behaviour of the decoding/encoding methods in qgsrasterdataprovider, defining a simple struct that contains the different elements that I should pass to my provider with the URI (instead of using a QVarianMap as output in the decode and input in the encode method);
  *   Add the decode functionality in the constructor of my provider;
  *   Add a test for the decode/encode method in the unit test class;
  *   Add a test for the constructor in the unit test class;
  *   Add some checks in the decode method to detect invalid or missing string element that should be, instead, in the URI;
  *   Add some checks in the provider constructor to see if the decoded elements are valid.

Plans for next week:

  *   Continue to develop the checks of the URI both in the provider constructor and in the decode method;
  *   Work on the block method of the virtual raster provider, avoiding hardcoded data and try to use the provider via python console or in a more general unit test;
  *   Submit the requested evaluation.

At the moment I'm not blocked on anything in particular. Don't hesitate to ask me for feeback or more specific clarification.

[1] https://wiki.osgeo.org/wiki/A_new_render_type_On_the_fly_Raster_Calculator_for_QGIS#7th_June_-_13th_June
[2​] https://github.com/Franc-Brs/QGIS/tree/VRProvider

My best regards,
Francesco Bursi

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