2024年4月22日发(作者：)
return Size(ratio * , ratio * );
} else {
final maxSide = 0.25 * stSide;
final ratio = maxSide / tSide;
return Size(ratio * , ratio * );
}
}
bool _isFinderPatternPosition(int x, int y) {
final isTopLeft = (y < _finderPatternLimit && x < _finderPatternLimit);
final isBottomLeft = (y < _finderPatternLimit &&
(x >= _Count - _finderPatternLimit));
final isTopRight = (y >= _Count - _finderPatternLimit &&
(x < _finderPatternLimit));
return isTopLeft || isBottomLeft || isTopRight;
}
bool _hasOneNonZeroSide(Size size) => tSide > 0;
void _drawFinderPatternItem(
FinderPatternPosition position,
Canvas canvas,
_PaintMetrics metrics,
) {
final totalGap = (_finderPatternLimit - 1) * e;
final radius = ((_finderPatternLimit * ize) + totalGap) -
ize;
final strokeAdjust = (ize / 2.0);
final edgePos =
( + ontentSize) - (radius + strokeAdjust);
Offset offset;
if (position == t) {
offset =
Offset( + strokeAdjust, + strokeAdjust);
} else if (position == Left) {
offset = Offset( + strokeAdjust, edgePos);
} else {
offset = Offset(edgePos, + strokeAdjust);
}
// configure the paints
final outerPaint = _aint(PatternOuter,
position: position);
Width = ize;
= color;
final innerPaint = _aint(PatternInner,
position: position);
Width = ize;
= emptyColor ?? Color(0x00ffffff);
final dotPaint = _aint(PatternDot,
position: position);
= color;
final outerRect = WH(, , radius, radius);
ct(outerRect, outerPaint);
final innerRadius = radius - (2 * ize);
final innerRect = WH( + ize,
+ ize, innerRadius, innerRadius);
ct(innerRect, innerPaint);
final gap = ize * 2;
final dotSize = radius - gap - (2 * strokeAdjust);
final dotRect = WH( + ize + strokeAdjust,
+ ize + strokeAdjust, dotSize, dotSize);
ct(dotRect, dotPaint);
}
void _drawImageOverlay(
Canvas canvas, Offset position, Size size, QrEmbeddedImageStyle style) {
final paint = Paint()
..isAntiAlias = true
..filterQuality = ;
if (style != null) {
if ( != null) {
ilter = (, p);
}
}
final srcSize =
Size(le(), le());
final src = be(srcSize, & srcSize);
final dst = be(size, position & size);
ageRect(embeddedImage, src, dst, paint);
}
void _init(String data) {
if (!ortedVersion(version)) {
throw QrUnsupportedVersionException(version);
}
// configure and make the QR code data
final validationResult = te(
data: data,
version: version,
errorCorrectionLevel: errorCorrectionLevel,
);
if (!d) {
throw ;
}
_qr = ;
_calcVersion = _mber;
_initPaints();
}
void _initPaints() {
// Cache the pixel paint object. For now there is only one but we might
// expand it to multiple later (e.g.: different colours).
_(
Paint()..style = , xel);
// Cache the empty pixel paint object. Empty color is deprecated and will go
// away.
_(
Paint()..style = , xelEmpty);
// Cache the finder pattern painters. We'll keep one for each one in case
// we want to provide customization options later.
for (final position in ) {
_(Paint()..style = ,
PatternOuter,
position: position);
_(Paint()..style = ,
PatternInner,
position: position);
_(
Paint()..style = , PatternDot,
position: position);
}
}
发布评论