Implemented the code to load the wiggle format files (both bigWig and wig formats), and used existing GraphIntervalSym to load the syms. Testing is also done, working as expected. Didn't add the wigMaf file format as it's a bit different from the wiggle file formats: https://api.genome.ucsc.edu/getData/track?genome=hg38&track=multiz100way&chrom=chr1&start=8372&end=33172, Nowlan Freese Could you please check this format once and let me know whether it's okay to treat it as a wig format.

Code is available at branch: https://bitbucket.org/jaya-sravani/integrated-genome-browser/branch/IGBF-3501.
To test:

1. Download https://bitbucket.org/jaya-sravani/integrated-genome-browser/downloads/ installer or clone this branch to local https://bitbucket.org/jaya-sravani/integrated-genome-browser/branch/IGBF-3501 and start the application.
2. Select a particular genome, preferably one that doesn't have data in IGB quick load.
3. Select any bigWig or wig track (dataset) type.
4. Click on the load data button either from the top right corner or in the data management table.
   

Testing on Mac

Testing wig file format with this API call - I am able to select the phastCons77way track, go to chr23:6,048,722-6,118,695 in the galGal6 genome, and click Load Data. Data appear correctly, no issues in log. However, when I zoom in the data disappear. When using the Selection Info track, I see a y coord of "no point" or "0". If I go to the Graph tab and select Save Graph, the file contains the correct data, and when I load the new graph in IGB, the graph works correctly. So the data are present in IGB, but they are not displaying correctly for some reason.

See dataDisappearing_WIG.png and example.wig files for comparison.

Testing bigwig with this API call - I am able to add and load the data successfully, everything looks good.

Fixed the issue graph disappearing issue for the wig format file by adding sort on X values, the same way it's been done while manually loading a wig file. Tested the code, working as expected. Attached the screenshots below. Code is available at the branch https://bitbucket.org/jaya-sravani/integrated-genome-browser/branch/IGBF-3501

phastCons77way appearing correctly in IGB.

Closing ticket.