X zoom shortcut

[josiahseaman]

While holding SHIFT and scrolling, compress the X axis view window without modifying the Y scale. This allows you to put the entire bin matrix in view.

• [ ] Make this the default starting view

Notes

• tubemap.js: zoomBy(zoomFactor) likely place for Yscale
• alignSVG()
• modifying K (transform.k)

  d3.select(svgID)
  .transition()
  .duration(750)
  .call(
    zoom.transform,
    d3.zoomIdentity.translate(translateX, translateY).scale(1.0)//translateK)
  );