Subversion-Projekte lars-tiefland.cienc

/** @preserve
jsPDF Silly SVG plugin
Copyright (c) 2012 Willow Systems Corporation, willow-systems.com
*/
/**
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 * ====================================================================
 */

;(function(jsPDFAPI) {
'use strict'

/**
Parses SVG XML and converts only some of the SVG elements into
PDF elements.

Supports:
 paths

@public
@function
@param
@returns {Type}
*/
jsPDFAPI.addSVG = function(svgtext, x, y, w, h) {
        // 'this' is _jsPDF object returned when jsPDF is inited (new jsPDF())

        var undef

        if (x === undef || x === undef) {
                throw new Error("addSVG needs values for 'x' and 'y'")
        }

    function InjectCSS(cssbody, document) {
        var styletag = document.createElement('style')
        styletag.type = 'text/css'
        if (styletag.styleSheet) {
                // ie
            styletag.styleSheet.cssText = cssbody
        } else {
                // others
            styletag.appendChild(document.createTextNode(cssbody))
        }
        document.getElementsByTagName("head")[0].appendChild(styletag)
    }

        function createWorkerNode(document){

                var frameID = 'childframe' // Date.now().toString() + '_' + (Math.random() * 100).toString()
                , frame = document.createElement('iframe')

                InjectCSS(
                        '.jsPDF_sillysvg_iframe {display:none;position:absolute;}'
                        , document
                )

                frame.name = frameID
                frame.setAttribute("width", 0)
                frame.setAttribute("height", 0)
                frame.setAttribute("frameborder", "0")
                frame.setAttribute("scrolling", "no")
                frame.setAttribute("seamless", "seamless")
                frame.setAttribute("class", "jsPDF_sillysvg_iframe")
                
                document.body.appendChild(frame)

                return frame
        }

        function attachSVGToWorkerNode(svgtext, frame){
                var framedoc = ( frame.contentWindow || frame.contentDocument ).document
                framedoc.write(svgtext)
                framedoc.close()
                return framedoc.getElementsByTagName('svg')[0]
        }

        function convertPathToPDFLinesArgs(path){
                'use strict'
                // we will use 'lines' method call. it needs:
                // - starting coordinate pair
                // - array of arrays of vector shifts (2-len for line, 6 len for bezier)
                // - scale array [horizontal, vertical] ratios
                // - style (stroke, fill, both)

                var x = parseFloat(path[1])
                , y = parseFloat(path[2])
                , vectors = []
                , position = 3
                , len = path.length

                while (position < len){
                        if (path[position] === 'c'){
                                vectors.push([
                                        parseFloat(path[position + 1])
                                        , parseFloat(path[position + 2])
                                        , parseFloat(path[position + 3])
                                        , parseFloat(path[position + 4])
                                        , parseFloat(path[position + 5])
                                        , parseFloat(path[position + 6])
                                ])
                                position += 7
                        } else if (path[position] === 'l') {
                                vectors.push([
                                        parseFloat(path[position + 1])
                                        , parseFloat(path[position + 2])
                                ])
                                position += 3
                        } else {
                                position += 1
                        }
                }
                return [x,y,vectors]
        }

        var workernode = createWorkerNode(document)
        , svgnode = attachSVGToWorkerNode(svgtext, workernode)
        , scale = [1,1]
        , svgw = parseFloat(svgnode.getAttribute('width'))
        , svgh = parseFloat(svgnode.getAttribute('height'))

        if (svgw && svgh) {
                // setting both w and h makes image stretch to size.
                // this may distort the image, but fits your demanded size
                if (w && h) {
                        scale = [w / svgw, h / svgh]
                } 
                // if only one is set, that value is set as max and SVG 
                // is scaled proportionately.
                else if (w) {
                        scale = [w / svgw, w / svgw]
                } else if (h) {
                        scale = [h / svgh, h / svgh]
                }
        }

        var i, l, tmp
        , linesargs
        , items = svgnode.childNodes
        for (i = 0, l = items.length; i < l; i++) {
                tmp = items[i]
                if (tmp.tagName && tmp.tagName.toUpperCase() === 'PATH') {
                        linesargs = convertPathToPDFLinesArgs( tmp.getAttribute("d").split(' ') )
                        // path start x coordinate
                        linesargs[0] = linesargs[0] * scale[0] + x // where x is upper left X of image
                        // path start y coordinate
                        linesargs[1] = linesargs[1] * scale[1] + y // where y is upper left Y of image
                        // the rest of lines are vectors. these will adjust with scale value auto.
                        this.lines.call(
                                this
                                , linesargs[2] // lines
                                , linesargs[0] // starting x
                                , linesargs[1] // starting y
                                , scale
                        )
                }
        }

        // clean up
        // workernode.parentNode.removeChild(workernode)

        return this
}

})(jsPDF.API)