/** * Package: svgedit.units * * Licensed under the Apache License, Version 2 * * Copyright(c) 2010 Alexis Deveria * Copyright(c) 2010 Jeff Schiller */ // Dependencies: // 1) jQuery (function() { if (!window.svgedit) { window.svgedit = {}; } if (!svgedit.units) { svgedit.units = {}; } var w_attrs = ['x', 'x1', 'cx', 'rx', 'width']; var h_attrs = ['y', 'y1', 'cy', 'ry', 'height']; var unit_attrs = $.merge(['r','radius'], w_attrs); var unitNumMap = { '%': 2, 'em': 3, 'ex': 4, 'px': 5, 'cm': 6, 'mm': 7, 'in': 8, 'pt': 9, 'pc': 10 }; $.merge(unit_attrs, h_attrs); // Container of elements. var elementContainer_; /** * Stores mapping of unit type to user coordinates. */ var typeMap_ = {px: 1}; /** * 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: svgedit.units.init() * Initializes this module. * * Parameters: * elementContainer - an object implementing the ElementContainer interface. */ svgedit.units.init = function(elementContainer) { elementContainer_ = elementContainer; var svgns = 'http://www.w3.org/2000/svg'; // Get correct em/ex values by creating a temporary SVG. var svg = document.createElementNS(svgns, 'svg'); document.body.appendChild(svg); var rect = document.createElementNS(svgns,'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; typeMap_['ex'] = bb.height; typeMap_['in'] = inch; typeMap_['cm'] = inch / 2.54; typeMap_['mm'] = inch / 25.4; typeMap_['pt'] = inch / 72; typeMap_['pc'] = inch / 6; typeMap_['%'] = 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.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 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(w_attrs.indexOf(attr) >= 0) { // val = val / res.w; // } else if(h_attrs.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 for(var 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; if(val.substr(-1) === '%') { // Deal with percentage, depends on attribute var num = val.substr(0, val.length-1)/100; var width = elementContainer_.getWidth(); var height = elementContainer_.getHeight(); if(w_attrs.indexOf(attr) >= 0) { return num * width; } else if(h_attrs.indexOf(attr) >= 0) { return num * height; } else { return num * Math.sqrt((width*width) + (height*height))/Math.sqrt(2); } } else { var unit = val.substr(-2); var 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) { var valid = false; if(unit_attrs.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); } catch(e) {} return result; } else valid = true; return valid; }; })();