260 lines
6.9 KiB
JavaScript
260 lines
6.9 KiB
JavaScript
/**
|
|
* 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;
|
|
};
|
|
|
|
|
|
})(); |