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var encodings = {
'0':'bwbWBwBwb',
'1':'BwbWbwbwB',
'2':'bwBWbwbwB',
'3':'BwBWbwbwb',
'4':'bwbWBwbwB',
'5':'BwbWBwbwb',
'6':'bwBWBwbwb',
'7':'bwbWbwBwB',
'8':'BwbWbwBwb',
'9':'bwBWbwBwb',
'A':'BwbwbWbwB',
'B':'bwBwbWbwB',
'C':'BwBwbWbwb',
'D':'bwbwBWbwB',
'E':'BwbwBWbwb',
'F':'bwBwBWbwb',
'G':'bwbwbWBwB',
'H':'BwbwbWBwb',
'I':'bwBwbWBwb',
'J':'bwbwBWBwb',
'K':'BwbwbwbWB',
'L':'bwBwbwbWB',
'M':'BwBwbwbWb',
'N':'bwbwBwbWB',
'O':'BwbwBwbWb',
'P':'bwBwBwbWb',
'Q':'bwbwbwBWB',
'R':'BwbwbwBWb',
'S':'bwBwbwBWb',
'T':'bwbwBwBWb',
'U':'BWbwbwbwB',
'V':'bWBwbwbwB',
'W':'BWBwbwbwb',
'X':'bWbwBwbwB',
'Y':'BWbwBwbwb',
'Z':'bWBwBwbwb',
'-':'bWbwbwBwB',
'.':'BWbwbwBwb',
' ':'bWBwbwBwb',
'$':'bWbWbWbwb',
'/':'bWbWbwbWb',
'+':'bWbwbWbWb',
'%':'bwbWbWbWb',
'*':'bWbwBwBwb'
}
var height = 100;
var paintText = true;
var canvas;
var ctx;
var code39_init = function() {
canvas = $('#barcode')[0];
ctx = canvas.getContext("2d");
}
var code39_checksum = function(barcode) {
var charset = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%";
var subtotal = 0;
var c;
for (c in barcode) {
subtotal += charset.indexOf(barcode[c]);
}
return charset[subtotal%43];
}
var code39_draw = function(text, add_checksum) {
var showtext = text;
if(add_checksum) {
text += code39_checksum(text);
showtext += " ";
}
text = "*" + text + "*";
showtext = " " + showtext + " ";
var txtLength = text.length;
var totalWidth = txtLength*15 +txtLength - 1;
cwidth = totalWidth+30;
ctx.clearRect(0,0,canvas.width,canvas.height);
canvas.style.height = canvas.height = height;
canvas.style.width = canvas.width = cwidth ;
ctx.fillStyle = "rgb(255,255,255)";
ctx.fillRect(0,0,canvas.width,canvas.height);
var i,j;
/* Rounding to prevent antialising */
var currentx = Math.round(cwidth/2-totalWidth/2), currenty = 20;
/* wides are 3x width of narrow */
var widewidth = 3;
var barheight = 80;
if(paintText) {
barheight -= 20;
}
for(i=0;i<text.length;i++) {
var code = encodings[text[i]];
if (!code) {
code = encodings['-'];
}
for(j=0;j<code.length;j++) {
if (j%2==0) {
/* black */
ctx.fillStyle = "rgb(0,0,0)";
} else {
/* white */
ctx.fillStyle = "rgb(255,255,255)";
}
if (code.charCodeAt(j)<91) {
/* wide */
ctx.fillRect (currentx, currenty, widewidth, barheight);
currentx += 3;
} else {
/* narrow */
ctx.fillRect (currentx, currenty, 1, barheight);
currentx += 1;
}
if (paintText && (j==5) && (typeof ctx.fillText == 'function')) {
ctx.fillStyle = "rgb(0,0,0)";
ctx.fillText(showtext[i], currentx, 90);
}
}
if (i!=text.length-1) {
/* draw narrow white as divider */
ctx.fillStyle = "rgb(255,255,255)";
ctx.fillRect (currentx, currenty, 1, barheight);
currentx += 1;
}
}
}
var code39_url = function() {
return canvas.toDataURL();
}
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