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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
cr.define('print_preview', function() {
'use strict';
/**
* Measurement system of the print preview. Used to parse and serialize point
* measurements into the system's local units (e.g. millimeters, inches).
* @param {string} thousandsDelimeter Delimeter between thousands digits.
* @param {string} decimalDelimeter Delimeter between integers and decimals.
* @param {!print_preview.MeasurementSystem.UnitType} unitType Measurement
* unit type of the system.
* @constructor
*/
function MeasurementSystem(thousandsDelimeter, decimalDelimeter, unitType) {
this.thousandsDelimeter_ = thousandsDelimeter || ',';
this.decimalDelimeter_ = decimalDelimeter || '.';
this.unitType_ = unitType;
};
/**
* Parses |numberFormat| and extracts the symbols used for the thousands point
* and decimal point.
* @param {string} numberFormat The formatted version of the number 12345678.
* @return {!Array.<string>} The extracted symbols in the order
* [thousandsSymbol, decimalSymbol]. For example,
* parseNumberFormat("123,456.78") returns [",", "."].
*/
MeasurementSystem.parseNumberFormat = function(numberFormat) {
if (!numberFormat) {
return [',', '.'];
}
var regex = /^(\d+)(\W?)(\d+)(\W?)(\d+)$/;
var matches = numberFormat.match(regex) || ['', '', ',', '', '.'];
return [matches[2], matches[4]];
};
/**
* Enumeration of measurement unit types.
* @enum {number}
*/
MeasurementSystem.UnitType = {
METRIC: 0, // millimeters
IMPERIAL: 1 // inches
};
/**
* Maximum resolution of local unit values.
* @type {!Object.<!print_preview.MeasurementSystem.UnitType, number>}
* @private
*/
MeasurementSystem.Precision_ = {};
MeasurementSystem.Precision_[MeasurementSystem.UnitType.METRIC] = 0.5;
MeasurementSystem.Precision_[MeasurementSystem.UnitType.IMPERIAL] = 0.01;
/**
* Maximum number of decimal places to keep for local unit.
* @type {!Object.<!print_preview.MeasurementSystem.UnitType, number>}
* @private
*/
MeasurementSystem.DecimalPlaces_ = {};
MeasurementSystem.DecimalPlaces_[MeasurementSystem.UnitType.METRIC] = 1;
MeasurementSystem.DecimalPlaces_[MeasurementSystem.UnitType.IMPERIAL] = 2;
/**
* Number of points per inch.
* @type {number}
* @const
* @private
*/
MeasurementSystem.PTS_PER_INCH_ = 72.0;
/**
* Number of points per millimeter.
* @type {number}
* @const
* @private
*/
MeasurementSystem.PTS_PER_MM_ = MeasurementSystem.PTS_PER_INCH_ / 25.4;
MeasurementSystem.prototype = {
/** @return {string} The unit type symbol of the measurement system. */
get unitSymbol() {
if (this.unitType_ == MeasurementSystem.UnitType.METRIC) {
return 'mm';
} else if (this.unitType_ == MeasurementSystem.UnitType.IMPERIAL) {
return '"';
} else {
throw Error('Unit type not supported: ' + this.unitType_);
}
},
/**
* @return {string} The thousands delimeter character of the measurement
* system.
*/
get thousandsDelimeter() {
return this.thousandsDelimeter_;
},
/**
* @return {string} The decimal delimeter character of the measurement
* system.
*/
get decimalDelimeter() {
return this.decimalDelimeter_;
},
setSystem: function(thousandsDelimeter, decimalDelimeter, unitType) {
this.thousandsDelimeter_ = thousandsDelimeter;
this.decimalDelimeter_ = decimalDelimeter;
this.unitType_ = unitType;
},
/**
* Rounds a value in the local system's units to the appropriate precision.
* @param {number} value Value to round.
* @return {number} Rounded value.
*/
roundValue: function(value) {
var precision = MeasurementSystem.Precision_[this.unitType_];
var roundedValue = Math.round(value / precision) * precision;
// Truncate
return +roundedValue.toFixed(
MeasurementSystem.DecimalPlaces_[this.unitType_]);
},
/**
* @param {number} pts Value in points to convert to local units.
* @return {number} Value in local units.
*/
convertFromPoints: function(pts) {
if (this.unitType_ == MeasurementSystem.UnitType.METRIC) {
return pts / MeasurementSystem.PTS_PER_MM_;
} else {
return pts / MeasurementSystem.PTS_PER_INCH_;
}
},
/**
* @param {number} localUnits Value in local units to convert to points.
* @return {number} Value in points.
*/
convertToPoints: function(localUnits) {
if (this.unitType_ == MeasurementSystem.UnitType.METRIC) {
return localUnits * MeasurementSystem.PTS_PER_MM_;
} else {
return localUnits * MeasurementSystem.PTS_PER_INCH_;
}
}
};
// Export
return {
MeasurementSystem: MeasurementSystem
};
});
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