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/*globals $, svgedit*/
/*jslint vars: true, eqeq: true*/
/**
* Package: svgedit.units
*
* Licensed under the MIT License
*
* Copyright(c) 2010 Alexis Deveria
* Copyright(c) 2010 Jeff Schiller
*/
// Dependencies:
// 1) jQuery
(function() {'use strict';
if (!svgedit.units) {
svgedit.units = {};
}
var NS = svgedit.NS;
var wAttrs = ['x', 'x1', 'cx', 'rx', 'width'];
var hAttrs = ['y', 'y1', 'cy', 'ry', 'height'];
var unitAttrs = ['r', 'radius'].concat(wAttrs, hAttrs);
// unused
var unitNumMap = {
'%': 2,
'em': 3,
'ex': 4,
'px': 5,
'cm': 6,
'mm': 7,
'in': 8,
'pt': 9,
'pc': 10
};
// Container of elements.
var elementContainer_;
/**
* Stores mapping of unit type to user coordinates.
*/
var typeMap_ = {};
/**
* ElementContainer interface
*
* function getBaseUnit() - returns a string of the base unit type of the container ('em')
* function getElement() - returns an element in the container given an id
* function getHeight() - returns the container's height
* function getWidth() - returns the container's width
* function getRoundDigits() - returns the number of digits number should be rounded to
*/
/**
* Function: svgedit.units.init()
* Initializes this module.
*
* Parameters:
* elementContainer - an object implementing the ElementContainer interface.
*/
svgedit.units.init = function(elementContainer) {
elementContainer_ = elementContainer;
// Get correct em/ex values by creating a temporary SVG.
var svg = document.createElementNS(NS.SVG, 'svg');
document.body.appendChild(svg);
var rect = document.createElementNS(NS.SVG, 'rect');
rect.setAttribute('width', '1em');
rect.setAttribute('height', '1ex');
rect.setAttribute('x', '1in');
svg.appendChild(rect);
var bb = rect.getBBox();
document.body.removeChild(svg);
var inch = bb.x;
typeMap_ = {
'em': bb.width,
'ex': bb.height,
'in': inch,
'cm': inch / 2.54,
'mm': inch / 25.4,
'pt': inch / 72,
'pc': inch / 6,
'px': 1,
'%': 0
};
};
// Group: Unit conversion functions
// Function: svgedit.units.getTypeMap
// Returns the unit object with values for each unit
svgedit.units.getTypeMap = function() {
return typeMap_;
};
// Function: svgedit.units.shortFloat
// Rounds a given value to a float with number of digits defined in save_options
//
// Parameters:
// val - The value as a String, Number or Array of two numbers to be rounded
//
// Returns:
// If a string/number was given, returns a Float. If an array, return a string
// with comma-seperated floats
svgedit.units.shortFloat = function(val) {
var digits = elementContainer_.getRoundDigits();
if (!isNaN(val)) {
// Note that + converts to Number
return +((+val).toFixed(digits));
}
if ($.isArray(val)) {
return svgedit.units.shortFloat(val[0]) + ',' + svgedit.units.shortFloat(val[1]);
}
return parseFloat(val).toFixed(digits) - 0;
};
// Function: svgedit.units.convertUnit
// Converts the number to given unit or baseUnit
svgedit.units.convertUnit = function(val, unit) {
unit = unit || elementContainer_.getBaseUnit();
// baseVal.convertToSpecifiedUnits(unitNumMap[unit]);
// var val = baseVal.valueInSpecifiedUnits;
// baseVal.convertToSpecifiedUnits(1);
return svgedit.units.shortFloat(val / typeMap_[unit]);
};
// Function: svgedit.units.setUnitAttr
// Sets an element's attribute based on the unit in its current value.
//
// Parameters:
// elem - DOM element to be changed
// attr - String with the name of the attribute associated with the value
// val - String with the attribute value to convert
svgedit.units.setUnitAttr = function(elem, attr, val) {
// if (!isNaN(val)) {
// New value is a number, so check currently used unit
// var old_val = elem.getAttribute(attr);
// Enable this for alternate mode
// if (old_val !== null && (isNaN(old_val) || elementContainer_.getBaseUnit() !== 'px')) {
// // Old value was a number, so get unit, then convert
// var unit;
// if (old_val.substr(-1) === '%') {
// var res = getResolution();
// unit = '%';
// val *= 100;
// if (wAttrs.indexOf(attr) >= 0) {
// val = val / res.w;
// } else if (hAttrs.indexOf(attr) >= 0) {
// val = val / res.h;
// } else {
// return val / Math.sqrt((res.w*res.w) + (res.h*res.h))/Math.sqrt(2);
// }
// } else {
// if (elementContainer_.getBaseUnit() !== 'px') {
// unit = elementContainer_.getBaseUnit();
// } else {
// unit = old_val.substr(-2);
// }
// val = val / typeMap_[unit];
// }
//
// val += unit;
// }
// }
elem.setAttribute(attr, val);
};
var attrsToConvert = {
'line': ['x1', 'x2', 'y1', 'y2'],
'circle': ['cx', 'cy', 'r'],
'ellipse': ['cx', 'cy', 'rx', 'ry'],
'foreignObject': ['x', 'y', 'width', 'height'],
'rect': ['x', 'y', 'width', 'height'],
'image': ['x', 'y', 'width', 'height'],
'use': ['x', 'y', 'width', 'height'],
'text': ['x', 'y']
};
// Function: svgedit.units.convertAttrs
// Converts all applicable attributes to the configured baseUnit
//
// Parameters:
// element - a DOM element whose attributes should be converted
svgedit.units.convertAttrs = function(element) {
var elName = element.tagName;
var unit = elementContainer_.getBaseUnit();
var attrs = attrsToConvert[elName];
if (!attrs) {return;}
var len = attrs.length;
var i;
for (i = 0; i < len; i++) {
var attr = attrs[i];
var cur = element.getAttribute(attr);
if (cur) {
if (!isNaN(cur)) {
element.setAttribute(attr, (cur / typeMap_[unit]) + unit);
}
// else {
// Convert existing?
// }
}
}
};
// Function: svgedit.units.convertToNum
// Converts given values to numbers. Attributes must be supplied in
// case a percentage is given
//
// Parameters:
// attr - String with the name of the attribute associated with the value
// val - String with the attribute value to convert
svgedit.units.convertToNum = function(attr, val) {
// Return a number if that's what it already is
if (!isNaN(val)) {return val-0;}
var num;
if (val.substr(-1) === '%') {
// Deal with percentage, depends on attribute
num = val.substr(0, val.length-1)/100;
var width = elementContainer_.getWidth();
var height = elementContainer_.getHeight();
if (wAttrs.indexOf(attr) >= 0) {
return num * width;
}
if (hAttrs.indexOf(attr) >= 0) {
return num * height;
}
return num * Math.sqrt((width*width) + (height*height))/Math.sqrt(2);
}
var unit = val.substr(-2);
num = val.substr(0, val.length-2);
// Note that this multiplication turns the string into a number
return num * typeMap_[unit];
};
// Function: svgedit.units.isValidUnit
// Check if an attribute's value is in a valid format
//
// Parameters:
// attr - String with the name of the attribute associated with the value
// val - String with the attribute value to check
svgedit.units.isValidUnit = function(attr, val, selectedElement) {
var valid = false;
if (unitAttrs.indexOf(attr) >= 0) {
// True if it's just a number
if (!isNaN(val)) {
valid = true;
} else {
// Not a number, check if it has a valid unit
val = val.toLowerCase();
$.each(typeMap_, function(unit) {
if (valid) {return;}
var re = new RegExp('^-?[\\d\\.]+' + unit + '$');
if (re.test(val)) {valid = true;}
});
}
} else if (attr == 'id') {
// if we're trying to change the id, make sure it's not already present in the doc
// and the id value is valid.
var result = false;
// because getElem() can throw an exception in the case of an invalid id
// (according to http://www.w3.org/TR/xml-id/ IDs must be a NCName)
// we wrap it in an exception and only return true if the ID was valid and
// not already present
try {
var elem = elementContainer_.getElement(val);
result = (elem == null || elem === selectedElement);
} catch(e) {}
return result;
}
valid = true;
return valid;
};
}());
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