analytics/webcontent/bi/js/storytelling/ScaleManager.js

'use strict';

/**
 * Licensed Materials - Property of IBM
 * IBM Cognos Products: Storytelling
 * (C) Copyright IBM Corp. 2014, 2018
 * US Government Users Restricted Rights - Use, duplication or disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
 */

define(['baglass/core-client/js/core-client/ui/core/Events'], function (Events) {

	var ScaleManager = Events.extend({

		defaultPixelsPerSecond: 1,
		minScale: 1,
		maxScale: 250,
		scale: 1,
		duration: 0,
		availableWidth: 0,

		init: function init() {
			ScaleManager.inherited('init', this, arguments);
		},

		updateDuration: function updateDuration(duration, availableWidth) {
			this.duration = duration;
			this.availableWidth = availableWidth;
		},

		scaleToFit: function scaleToFit() {
			var scale = this._calculateFitToSizeScale();

			this.setScale(scale);
		},

		/**
   * @param step - a scale factor to apply
   */
		stepScale: function stepScale(step) {
			if (step !== 0) {
				this.setScale(this.scale * step);
			}
		},

		setScale: function setScale(scale) {
			var previousScale = this.scale;
			this.scale = Math.max(this.minScale, Math.min(this.maxScale, scale));

			this.trigger('scale:change', { scale: this.scale, previousScale: previousScale });
		},

		getScale: function getScale() {
			return this.scale;
		},

		getScaleToPixelRatio: function getScaleToPixelRatio() {
			return this.defaultPixelsPerSecond;
		},

		getMinScale: function getMinScale() {
			return this.minScale;
		},

		getMaxScale: function getMaxScale() {
			return this.maxScale;
		},

		convertTimeToPosition: function convertTimeToPosition(time) {
			return time / 1000 * this.defaultPixelsPerSecond * (this.scale || 1);
		},

		convertPositionToTime: function convertPositionToTime(position) {
			return position / (this.defaultPixelsPerSecond * (this.scale || 1)) * 1000;
		},

		/*
   * Helpers.
   */
		_calculateFitToSizeScale: function _calculateFitToSizeScale() {
			var position = this.convertTimeToPosition(this.duration);
			var ratio = position > 0 ? this.availableWidth / position : 1;
			return this.scale * ratio;
		}
	});

	return ScaleManager;
});
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