281 lines
7.6 KiB
JavaScript
281 lines
7.6 KiB
JavaScript
/**
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* Package: svgedit.units
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*
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* Licensed under the Apache License, Version 2
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*
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* Copyright(c) 2010 Alexis Deveria
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* Copyright(c) 2010 Jeff Schiller
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*/
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// Dependencies:
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// 1) jQuery
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var svgedit = svgedit || {};
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(function() {
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if (!svgedit.units) {
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svgedit.units = {};
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}
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var w_attrs = ['x', 'x1', 'cx', 'rx', 'width'];
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var h_attrs = ['y', 'y1', 'cy', 'ry', 'height'];
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var unit_attrs = $.merge(['r','radius'], w_attrs);
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var unitNumMap = {
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'%': 2,
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'em': 3,
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'ex': 4,
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'px': 5,
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'cm': 6,
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'mm': 7,
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'in': 8,
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'pt': 9,
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'pc': 10
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};
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$.merge(unit_attrs, h_attrs);
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// Container of elements.
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var elementContainer_;
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/**
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* Stores mapping of unit type to user coordinates.
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*/
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var typeMap_ = {px: 1};
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/**
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* ElementContainer interface
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*
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* function getBaseUnit() - returns a string of the base unit type of the container ("em")
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* function getElement() - returns an element in the container given an id
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* function getHeight() - returns the container's height
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* function getWidth() - returns the container's width
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* function getRoundDigits() - returns the number of digits number should be rounded to
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*/
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/**
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* Function: svgedit.units.init()
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* Initializes this module.
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*
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* Parameters:
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* elementContainer - an object implementing the ElementContainer interface.
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*/
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svgedit.units.init = function(elementContainer) {
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elementContainer_ = elementContainer;
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var svgns = 'http://www.w3.org/2000/svg';
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// Get correct em/ex values by creating a temporary SVG.
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var svg = document.createElementNS(svgns, 'svg');
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document.body.appendChild(svg);
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var rect = document.createElementNS(svgns,'rect');
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rect.setAttribute('width',"1em");
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rect.setAttribute('height',"1ex");
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rect.setAttribute('x',"1in");
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svg.appendChild(rect);
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var bb = rect.getBBox();
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document.body.removeChild(svg);
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var inch = bb.x;
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typeMap_['em'] = bb.width;
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typeMap_['ex'] = bb.height;
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typeMap_['in'] = inch;
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typeMap_['cm'] = inch / 2.54;
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typeMap_['mm'] = inch / 25.4;
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typeMap_['pt'] = inch / 72;
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typeMap_['pc'] = inch / 6;
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typeMap_['%'] = 0;
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};
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// Group: Unit conversion functions
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// Function: svgedit.units.getTypeMap
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// Returns the unit object with values for each unit
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svgedit.units.getTypeMap = function() {
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return typeMap_;
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};
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// Function: svgedit.units.shortFloat
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// Rounds a given value to a float with number of digits defined in save_options
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//
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// Parameters:
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// val - The value as a String, Number or Array of two numbers to be rounded
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//
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// Returns:
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// If a string/number was given, returns a Float. If an array, return a string
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// with comma-seperated floats
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svgedit.units.shortFloat = function(val) {
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var digits = elementContainer_.getRoundDigits();
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if(!isNaN(val)) {
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// Note that + converts to Number
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return +((+val).toFixed(digits));
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} else if($.isArray(val)) {
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return svgedit.units.shortFloat(val[0]) + ',' + svgedit.units.shortFloat(val[1]);
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}
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return parseFloat(val).toFixed(digits) - 0;
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};
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// Function: svgedit.units.convertUnit
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// Converts the number to given unit or baseUnit
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svgedit.units.convertUnit = function(val, unit) {
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unit = unit || elementContainer_.getBaseUnit();
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// baseVal.convertToSpecifiedUnits(unitNumMap[unit]);
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// var val = baseVal.valueInSpecifiedUnits;
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// baseVal.convertToSpecifiedUnits(1);
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return svgedit.unit.shortFloat(val / typeMap_[unit]);
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};
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// Function: svgedit.units.setUnitAttr
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// Sets an element's attribute based on the unit in its current value.
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//
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// Parameters:
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// elem - DOM element to be changed
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// attr - String with the name of the attribute associated with the value
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// val - String with the attribute value to convert
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svgedit.units.setUnitAttr = function(elem, attr, val) {
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if(!isNaN(val)) {
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// New value is a number, so check currently used unit
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var old_val = elem.getAttribute(attr);
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// Enable this for alternate mode
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// if(old_val !== null && (isNaN(old_val) || elementContainer_.getBaseUnit() !== 'px')) {
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// // Old value was a number, so get unit, then convert
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// var unit;
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// if(old_val.substr(-1) === '%') {
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// var res = getResolution();
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// unit = '%';
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// val *= 100;
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// if(w_attrs.indexOf(attr) >= 0) {
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// val = val / res.w;
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// } else if(h_attrs.indexOf(attr) >= 0) {
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// val = val / res.h;
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// } else {
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// return val / Math.sqrt((res.w*res.w) + (res.h*res.h))/Math.sqrt(2);
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// }
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// } else {
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// if(elementContainer_.getBaseUnit() !== 'px') {
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// unit = elementContainer_.getBaseUnit();
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// } else {
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// unit = old_val.substr(-2);
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// }
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// val = val / typeMap_[unit];
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// }
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//
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// val += unit;
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// }
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}
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elem.setAttribute(attr, val);
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};
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var attrsToConvert = {
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"line": ['x1', 'x2', 'y1', 'y2'],
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"circle": ['cx', 'cy', 'r'],
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"ellipse": ['cx', 'cy', 'rx', 'ry'],
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"foreignObject": ['x', 'y', 'width', 'height'],
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"rect": ['x', 'y', 'width', 'height'],
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"image": ['x', 'y', 'width', 'height'],
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"use": ['x', 'y', 'width', 'height'],
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"text": ['x', 'y']
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};
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// Function: svgedit.units.convertAttrs
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// Converts all applicable attributes to the configured baseUnit
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//
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// Parameters:
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// element - a DOM element whose attributes should be converted
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svgedit.units.convertAttrs = function(element) {
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var elName = element.tagName;
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var unit = elementContainer_.getBaseUnit();
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var attrs = attrsToConvert[elName];
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if(!attrs) return;
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var len = attrs.length
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for(var i = 0; i < len; i++) {
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var attr = attrs[i];
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var cur = element.getAttribute(attr);
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if(cur) {
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if(!isNaN(cur)) {
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element.setAttribute(attr, (cur / typeMap_[unit]) + unit);
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} else {
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// Convert existing?
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}
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}
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}
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};
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// Function: svgedit.units.convertToNum
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// Converts given values to numbers. Attributes must be supplied in
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// case a percentage is given
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//
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// Parameters:
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// attr - String with the name of the attribute associated with the value
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// val - String with the attribute value to convert
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svgedit.units.convertToNum = function(attr, val) {
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// Return a number if that's what it already is
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if(!isNaN(val)) return val-0;
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if(val.substr(-1) === '%') {
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// Deal with percentage, depends on attribute
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var num = val.substr(0, val.length-1)/100;
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var width = elementContainer_.getWidth();
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var height = elementContainer_.getHeight();
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if(w_attrs.indexOf(attr) >= 0) {
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return num * width;
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} else if(h_attrs.indexOf(attr) >= 0) {
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return num * height;
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} else {
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return num * Math.sqrt((width*width) + (height*height))/Math.sqrt(2);
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}
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} else {
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var unit = val.substr(-2);
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var num = val.substr(0, val.length-2);
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// Note that this multiplication turns the string into a number
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return num * typeMap_[unit];
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}
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};
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// Function: svgedit.units.isValidUnit
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// Check if an attribute's value is in a valid format
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//
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// Parameters:
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// attr - String with the name of the attribute associated with the value
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// val - String with the attribute value to check
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svgedit.units.isValidUnit = function(attr, val) {
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var valid = false;
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if(unit_attrs.indexOf(attr) >= 0) {
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// True if it's just a number
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if(!isNaN(val)) {
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valid = true;
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} else {
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// Not a number, check if it has a valid unit
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val = val.toLowerCase();
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$.each(typeMap_, function(unit) {
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if(valid) return;
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var re = new RegExp('^-?[\\d\\.]+' + unit + '$');
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if(re.test(val)) valid = true;
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});
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}
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} else if (attr == "id") {
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// if we're trying to change the id, make sure it's not already present in the doc
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// and the id value is valid.
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var result = false;
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// because getElem() can throw an exception in the case of an invalid id
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// (according to http://www.w3.org/TR/xml-id/ IDs must be a NCName)
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// we wrap it in an exception and only return true if the ID was valid and
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// not already present
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try {
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var elem = elementContainer_.getElement(val);
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result = (elem == null);
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} catch(e) {}
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return result;
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} else {
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valid = true;
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}
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return valid;
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};
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})(); |