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Added option to hide dataModules behind embedded image #173

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Added option to hide dataModules behind embedded image #173

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45 changes: 34 additions & 11 deletions lib/src/qr_painter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@ class QrPainter extends CustomPainter {
dataModuleShape: QrDataModuleShape.square,
color: Color(0xFF000000),
),
this.showDataModulesBehindEmbeddedImage = true
}) : assert(QrVersions.isSupportedVersion(version)) {
_init(data);
}
Expand All @@ -67,6 +68,7 @@ class QrPainter extends CustomPainter {
dataModuleShape: QrDataModuleShape.square,
color: Color(0xFF000000),
),
this.showDataModulesBehindEmbeddedImage = true
}) : _qr = qr,
version = qr.typeNumber,
errorCorrectionLevel = qr.errorCorrectLevel {
Expand Down Expand Up @@ -105,6 +107,9 @@ class QrPainter extends CustomPainter {
/// Styling option for QR data module.
final QrDataModuleStyle dataModuleStyle;

///Whether to paint or not the data modules behind the embedded image
final bool showDataModulesBehindEmbeddedImage;

/// The base QR code data
QrCode? _qr;

Expand Down Expand Up @@ -211,6 +216,29 @@ class QrPainter extends CustomPainter {
emptyPixelPaint = _paintCache.firstPaint(QrCodeElement.codePixelEmpty);
emptyPixelPaint!.color = emptyColor!;
}

//Determine the coordinates of the embedded image so we'll know where to place
//it and where not to paint qrcode's dataModules
Offset position = Offset(0, 0);
Size imageSize = Size(0, 0);
Rect imageRect = Rect.zero;
if (embeddedImage != null) {
final originalSize = Size(
embeddedImage!.width.toDouble(),
embeddedImage!.height.toDouble(),
);
final requestedSize =
embeddedImageStyle != null ? embeddedImageStyle!.size : null;
imageSize = _scaledAspectSize(size, originalSize, requestedSize);
position = Offset(
(size.width - imageSize.width) / 2.0,
(size.height - imageSize.height) / 2.0,
);

imageRect = Rect.fromLTWH(position.dx, position.dy,
imageSize.width, imageSize.height);
}

for (var x = 0; x < _qr!.moduleCount; x++) {
for (var y = 0; y < _qr!.moduleCount; y++) {
// draw the finder patterns independently
Expand All @@ -234,6 +262,12 @@ class QrPainter extends CustomPainter {
paintMetrics.pixelSize + pixelHTweak,
paintMetrics.pixelSize + pixelVTweak,
);

//If dataModule is inside innerContent (image) area -> don't paint it
if(!showDataModulesBehindEmbeddedImage &&
imageRect.overlaps(squareRect)
) continue;

if (dataModuleStyle.dataModuleShape == QrDataModuleShape.square) {
canvas.drawRect(squareRect, paint);
} else {
Expand All @@ -245,17 +279,6 @@ class QrPainter extends CustomPainter {
}

if (embeddedImage != null) {
final originalSize = Size(
embeddedImage!.width.toDouble(),
embeddedImage!.height.toDouble(),
);
final requestedSize =
embeddedImageStyle != null ? embeddedImageStyle!.size : null;
final imageSize = _scaledAspectSize(size, originalSize, requestedSize);
final position = Offset(
(size.width - imageSize.width) / 2.0,
(size.height - imageSize.height) / 2.0,
);
// draw the image overlay.
_drawImageOverlay(canvas, position, imageSize, embeddedImageStyle);
}
Expand Down