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Add a quiet zone for dark backgrounds #225

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Add a quiet zone for dark backgrounds #225

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3 changes: 2 additions & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,8 @@ var qrcode = new QRCode(document.getElementById("qrcode"), {
height: 128,
colorDark : "#000000",
colorLight : "#ffffff",
correctLevel : QRCode.CorrectLevel.H
correctLevel : QRCode.CorrectLevel.H,
addQuietZone : true // For when printed on a dark background
});
</script>
```
Expand Down
72 changes: 46 additions & 26 deletions qrcode.js
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Original file line number Diff line number Diff line change
Expand Up @@ -377,40 +377,58 @@ var QRCode;
var _elImage = this._elImage;
var _oContext = this._oContext;
var _htOption = this._htOption;
var nCount = oQRCode.getModuleCount();
var nWidth = _htOption.width / nCount;
var nHeight = _htOption.height / nCount;
var nCountWithQuietZone = nCount;
if(_htOption.addQuietZone) {
nCountWithQuietZone += 2;
}
var nWidth = _htOption.width / nCountWithQuietZone;
var nHeight = _htOption.height / nCountWithQuietZone;
var nRoundedWidth = Math.round(nWidth);
var nRoundedHeight = Math.round(nHeight);

_elImage.style.display = "none";
this.clear();

var drawBitSquare = function(row, col, bIsDark) {
var nLeft = col * nWidth;
var nTop = row * nHeight;
_oContext.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.lineWidth = 1;
_oContext.fillStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.fillRect(nLeft, nTop, nWidth, nHeight);

// 안티 앨리어싱 방지 처리
_oContext.strokeRect(
Math.floor(nLeft) + 0.5,
Math.floor(nTop) + 0.5,
nRoundedWidth,
nRoundedHeight
);

_oContext.strokeRect(
Math.ceil(nLeft) - 0.5,
Math.ceil(nTop) - 0.5,
nRoundedWidth,
nRoundedHeight
);
}

if(_htOption.addQuietZone) {
var last = nCountWithQuietZone - 1;

for (var i = 0; i < nCountWithQuietZone; i++) {
drawBitSquare(0, i, false);
drawBitSquare(last, i, false);
drawBitSquare(i, 0, false);
drawBitSquare(i, last, false);
}
}

for (var row = 0; row < nCount; row++) {
for (var col = 0; col < nCount; col++) {
var bIsDark = oQRCode.isDark(row, col);
var nLeft = col * nWidth;
var nTop = row * nHeight;
_oContext.strokeStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.lineWidth = 1;
_oContext.fillStyle = bIsDark ? _htOption.colorDark : _htOption.colorLight;
_oContext.fillRect(nLeft, nTop, nWidth, nHeight);

// 안티 앨리어싱 방지 처리
_oContext.strokeRect(
Math.floor(nLeft) + 0.5,
Math.floor(nTop) + 0.5,
nRoundedWidth,
nRoundedHeight
);

_oContext.strokeRect(
Math.ceil(nLeft) - 0.5,
Math.ceil(nTop) - 0.5,
nRoundedWidth,
nRoundedHeight
);
drawBitSquare(row + 1, col + 1, oQRCode.isDark(row, col));
}
}

Expand Down Expand Up @@ -531,6 +549,7 @@ var QRCode;
* @param {String} [vOption.colorDark="#000000"]
* @param {String} [vOption.colorLight="#ffffff"]
* @param {QRCode.CorrectLevel} [vOption.correctLevel=QRCode.CorrectLevel.H] [L|M|Q|H]
* @param {Boolean} [vOption.addQuietZone=false]
*/
QRCode = function (el, vOption) {
this._htOption = {
Expand All @@ -539,7 +558,8 @@ var QRCode;
typeNumber : 4,
colorDark : "#000000",
colorLight : "#ffffff",
correctLevel : QRErrorCorrectLevel.H
correctLevel : QRErrorCorrectLevel.H,
addQuietZone : false
};

if (typeof vOption === 'string') {
Expand Down
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