Create jspdf\jspdf.js

jspdf/jspdf\jspdf.js

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+
+/**
+ * jsPDF
+ * (c) 2009 James Hall
+ * 
+ * Some parts based on FPDF.
+ */
+
+var jsPDF = function(){
+
+	// Private properties
+	var version = '20090504';
+	var buffer = '';
+
+	var pdfVersion = '1.3'; // PDF Version
+	var defaultPageFormat = 'a4';
+	var pageFormats = { // Size in mm of various paper formats
+		'a3': [841.89, 1190.55],
+		'a4': [595.28, 841.89],
+		'a5': [420.94, 595.28],
+		'letter': [612, 792],
+		'legal': [612, 1008]
+	};
+	var textColor = '0 g';
+	var page = 0;
+	var objectNumber = 2; // 'n' Current object number
+	var state = 0; // Current document state
+	var pages = new Array();
+	var offsets = new Array(); // List of offsets
+	var lineWidth = 0.200025; // 2mm
+	var pageHeight;
+	var k; // Scale factor
+	var unit = 'mm'; // Default to mm for units
+	var fontNumber; // TODO: This is temp, replace with real font handling
+	var documentProperties = {};
+	var fontSize = 16; // Default font size
+	var pageFontSize = 16;
+
+	// Initilisation 
+	if (unit == 'pt') {
+		k = 1;
+	} else if(unit == 'mm') {
+		k = 72/25.4;
+	} else if(unit == 'cm') {
+		k = 72/2.54;
+	} else if(unit == 'in') {
+		k = 72;
+	}
+
+	// Private functions
+	var newObject = function() {
+		//Begin a new object
+		objectNumber ++;
+		offsets[objectNumber] = buffer.length;
+		out(objectNumber + ' 0 obj');		
+	}
+
+
+	var putHeader = function() {
+		out('%PDF-' + pdfVersion);
+	}
+
+	var putPages = function() {
+
+		// TODO: Fix, hardcoded to a4 portrait
+		var wPt = pageWidth * k;
+		var hPt = pageHeight * k;
+
+		for(n=1; n <= page; n++) {
+			newObject();
+			out('<</Type /Page');
+			out('/Parent 1 0 R');	
+			out('/Resources 2 0 R');
+			out('/Contents ' + (objectNumber + 1) + ' 0 R>>');
+			out('endobj');
+
+			//Page content
+			p = pages[n];
+			newObject();
+			out('<</Length ' + p.length  + '>>');
+			putStream(p);
+			out('endobj');					
+		}
+		offsets[1] = buffer.length;
+		out('1 0 obj');
+		out('<</Type /Pages');
+		var kids='/Kids [';
+		for (i = 0; i < page; i++) {
+			kids += (3 + 2 * i) + ' 0 R ';
+		}
+		out(kids + ']');
+		out('/Count ' + page);
+		out(sprintf('/MediaBox [0 0 %.2f %.2f]', wPt, hPt));
+		out('>>');
+		out('endobj');		
+	}
+
+	var putStream = function(str) {
+		out('stream');
+		out(str);
+		out('endstream');
+	}
+
+	var putResources = function() {
+		putFonts();
+		putImages();
+
+		//Resource dictionary
+		offsets[2] = buffer.length;
+		out('2 0 obj');
+		out('<<');
+		putResourceDictionary();
+		out('>>');
+		out('endobj');
+	}	
+
+	var putFonts = function() {
+		// TODO: Only supports core font hardcoded to Helvetica
+		newObject();
+		fontNumber = objectNumber;
+		name = 'Helvetica';
+		out('<</Type /Font');
+		out('/BaseFont /' + name);
+		out('/Subtype /Type1');
+		out('/Encoding /WinAnsiEncoding');
+		out('>>');
+		out('endobj');
+	}
+
+	var putImages = function() {
+		// TODO
+	}
+
+	var putResourceDictionary = function() {
+		out('/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]');
+		out('/Font <<');
+		// Do this for each font, the '1' bit is the index of the font
+        // fontNumber is currently the object number related to 'putFonts'
+		out('/F1 ' + fontNumber + ' 0 R');
+		out('>>');
+		out('/XObject <<');
+		putXobjectDict();
+		out('>>');
+	}
+
+	var putXobjectDict = function() {
+		// TODO
+		// Loop through images
+	}
+
+
+	var putInfo = function() {
+		out('/Producer (jsPDF ' + version + ')');
+		if(documentProperties.title != undefined) {
+			out('/Title (' + pdfEscape(documentProperties.title) + ')');
+		}
+		if(documentProperties.subject != undefined) {
+			out('/Subject (' + pdfEscape(documentProperties.subject) + ')');
+		}
+		if(documentProperties.author != undefined) {
+			out('/Author (' + pdfEscape(documentProperties.author) + ')');
+		}
+		if(documentProperties.keywords != undefined) {
+			out('/Keywords (' + pdfEscape(documentProperties.keywords) + ')');
+		}
+		if(documentProperties.creator != undefined) {
+			out('/Creator (' + pdfEscape(documentProperties.creator) + ')');
+		}		
+		var created = new Date();
+		var year = created.getFullYear();
+		var month = (created.getMonth() + 1);
+		var day = created.getDate();
+		var hour = created.getHours();
+		var minute = created.getMinutes();
+		var second = created.getSeconds();
+		out('/CreationDate (D:' + sprintf('%02d%02d%02d%02d%02d%02d', year, month, day, hour, minute, second) + ')');
+	}
+
+	var putCatalog = function () {
+		out('/Type /Catalog');
+		out('/Pages 1 0 R');
+		// TODO: Add zoom and layout modes
+		out('/OpenAction [3 0 R /FitH null]');
+		out('/PageLayout /OneColumn');
+	}	
+
+	function putTrailer() {
+		out('/Size ' + (objectNumber + 1));
+		out('/Root ' + objectNumber + ' 0 R');
+		out('/Info ' + (objectNumber - 1) + ' 0 R');
+	}	
+
+	var endDocument = function() {
+		state = 1;
+		putHeader();
+		putPages();
+
+		putResources();
+		//Info
+		newObject();
+		out('<<');
+		putInfo();
+		out('>>');
+		out('endobj');
+
+		//Catalog
+		newObject();
+		out('<<');
+		putCatalog();
+		out('>>');
+		out('endobj');
+
+		//Cross-ref
+		var o = buffer.length;
+		out('xref');
+		out('0 ' + (objectNumber + 1));
+		out('0000000000 65535 f ');
+		for (var i=1; i <= objectNumber; i++) {
+			out(sprintf('%010d 00000 n ', offsets[i]));
+		}
+		//Trailer
+		out('trailer');
+		out('<<');
+		putTrailer();
+		out('>>');
+		out('startxref');
+		out(o);
+		out('%%EOF');
+		state = 3;		
+	}
+
+	var beginPage = function() {
+		page ++;
+		// Do dimension stuff
+		state = 2;
+		pages[page] = '';
+
+		// TODO: Hardcoded at A4 and portrait
+		pageHeight = pageFormats['a4'][1] / k;
+		pageWidth = pageFormats['a4'][0] / k;
+	}
+
+	var out = function(string) {
+		if(state == 2) {
+			pages[page] += string + '\n';
+		} else {
+			buffer += string + '\n';
+		}
+	}
+
+	var _addPage = function() {
+		beginPage();
+		// Set line width
+		out(sprintf('%.2f w', (lineWidth * k)));
+
+		// Set font - TODO
+		// 16 is the font size
+		pageFontSize = fontSize;
+		out('BT /F1 ' + parseInt(fontSize) + '.00 Tf ET'); 		
+	}
+
+	// Add the first page automatically
+	_addPage();	
+
+	// Escape text
+	var pdfEscape = function(text) {
+		return text.replace(/\\/g, '\\\\').replace(/\(/g, '\\(').replace(/\)/g, '\\)');
+	}
+
+	return {
+		addPage: function() {
+			_addPage();
+		},
+		text: function(x, y, text) {
+			// need page height
+			if(pageFontSize != fontSize) {
+				out('BT /F1 ' + parseInt(fontSize) + '.00 Tf ET');
+				pageFontSize = fontSize;
+			}
+			var str = sprintf('BT %.2f %.2f Td (%s) Tj ET', x * k, (pageHeight - y) * k, pdfEscape(text));
+			out(str);
+		},
+		setProperties: function(properties) {
+			documentProperties = properties;
+		},
+		addImage: function(imageData, format, x, y, w, h) {
+
+		},
+		output: function(type, options) {
+			endDocument();
+			if(type == undefined) {
+				return buffer;
+			}
+			if(type == 'datauri') {
+				document.location.href = 'data:application/pdf;base64,' + Base64.encode(buffer);
+			}
+			// @TODO: Add different output options
+		},
+		setFontSize: function(size) {
+			fontSize = size;
+		}
+	}
+
+};