Live Example: http://jsfiddle.net
The Alignment Summary Viewer is a visualization component for biological multiple sequence alignments ( DNA or protein ). It provides a high level overview of the quality and and coverage characteristics which are useful when dealing with an unweildy number of sequences.
The summary view is an extension of a whisker plot which depicts the relative position and extents of each alignment as a single horizontal bar. The quality of individual alignments is further characterized using colors to represent a supplied quality metric over non-overlapping windows.
An Angular directive wrapper for this component is provided for Angular 1.5.
This specialized multiple alignment data format was developed for this component in order to minimize the payload and push some pre-processing of the data onto the server.
The component expects a JSON object containing summary information and and array of per sequence details.
- length: The overall length of the multiple alignment not including insertion/deletion columns.
- qualityBlockLen: The length of the non-overlapping quality windows over each sequence.
- numAlignments: The number of sequences aligned ( length of alignments array ).
- alignments: The array of aligned sequence records.
Array containing the following ordered fields:
- 0: The sequence identifier.
- 1: Start position in the multiple alignment.
- 2: Length of aligned sequence ( not including insertion/deletion positions ).
- 3: An array contain the quality values ( 1-lowest to 10-highest) for each qualityBlockLen length window over the sequence. The last value may represent a window less than qualityBlockLen length.
- 4: The orientation of the aligned sequence ( "F"-forward, "R"-reverse ).
- 5: The start position within the aligned sequence.
- 6: The end position within the aligned sequence.
The following is an example JSON object containing two sequences:
{
"length": 804,
"qualityBlockLen": 10,
"num_alignments": 2,
"alignments": [
["seq1", 8, 141, [9, 8, 10, 8, 6, 10, 9, 9, 9, 9, 10, 10, 10, 8]
, "F", "0.12", "201", "341"],
["seq2", 1, 172, [9, 9, 8, 9, 9, 7, 10, 10, 8, 10, 10, 10, 9,
8, 9, 10, 8], "F", "0.10", "201", "371"],
]
};
HTML code to display a static dataset:
<html>
<div id="canvasesdiv">
<canvas id="alignment_canvas" width="800" height="1600">Canvas not supported</canvas>
</div>
<script src='dist/AlignmentSummaryViewer.min.js'></script>
<script>
var summaryData = { #INSERT_YOUR_JSON_DATASET_HERE# };
var mySummary = new AlignmentSummaryViewer(
document.getElementById('alignment_canvas'),
summaryData, {});
// To avoid bluring caused by canvas auto-scaling the following code
// automatically adjusts the component size an redraws the elements.
window.onresize = function(event) {
if ( mySummary != null ) {
mySummary.resetHeight();
mySummary.render('norm');
}
};
</script>
</html>See the angular-example.html file for using the component as a Angular directive.