@gmod/jbrowse/src/JBrowse/View/Animation/Slider.js

JBrowse - client-side genome browser

define(['JBrowse/View/Animation'],
      function(Animation) {

/**
 * @class
 */
function Slider(view, callback, time, distance) {
    Animation.call(this, view, callback, time);
    this.slideStart = view.getX();
    this.slideDistance = distance;
}

Slider.prototype = new Animation();

Slider.prototype.step = function(pos) {
    var newX = (this.slideStart -
                (this.slideDistance *
                 //cos will go from 1 to -1, we want to go from 0 to 1
                 ((-0.5 * Math.cos(pos * Math.PI)) + 0.5))) | 0;

    newX = Math.max(Math.min(this.subject.maxLeft - this.subject.offset, newX),
                         this.subject.minLeft - this.subject.offset);
    this.subject.setX(newX);
};

return Slider;
});