m3_lightmeter/lib/screens/metering/components/topbar/shape_topbar.dart

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import 'dart:math';
import 'package:flutter/material.dart';
import 'package:lightmeter/res/dimens.dart';
class TopBarShape extends CustomPainter {
final Color color;
/// The appendix is on the left side
/// but if appendix height is negative, then we have to make a cutout
///
/// negative positive
/// | | /// | |
/// | | /// | |
/// | | /// | |
/// | | /// | |
/// \________ | /// | ________/
/// \ | /// | / ↑
/// | | /// | | | appendix height
/// \__________/ /// \__________/ ↓
///
final double appendixHeight;
final double appendixWidth;
TopBarShape({
required this.color,
required this.appendixHeight,
required this.appendixWidth,
});
@override
void paint(Canvas canvas, Size size) {
final paint = Paint()..color = color;
final path = Path();
const circularRadius = Radius.circular(Dimens.borderRadiusL);
if (appendixHeight == 0 || appendixWidth == 0) {
path.addRRect(
RRect.fromLTRBAndCorners(
0,
0,
0,
0,
bottomLeft: circularRadius,
bottomRight: circularRadius,
),
);
} else {
// Left side with bottom corner
path.lineTo(0, size.height + appendixHeight - Dimens.borderRadiusL);
path.arcToPoint(
Offset(Dimens.borderRadiusL, size.height + appendixHeight),
radius: circularRadius,
clockwise: false,
);
// Bottom side with step
final double allowedRadius = min(appendixHeight.abs() / 2, Dimens.borderRadiusL);
path.lineTo(appendixWidth - allowedRadius, size.height + appendixHeight);
final bool isCutout = appendixHeight < 0;
if (isCutout) {
path.arcToPoint(
Offset(appendixWidth, size.height + appendixHeight + allowedRadius),
radius: circularRadius,
clockwise: true,
);
path.lineTo(appendixWidth, size.height - allowedRadius);
} else {
path.arcToPoint(
Offset(appendixWidth, size.height + appendixHeight - allowedRadius),
radius: circularRadius,
clockwise: false,
);
path.lineTo(appendixWidth, size.height + allowedRadius);
}
path.arcToPoint(
Offset(appendixWidth + allowedRadius, size.height),
radius: circularRadius,
clockwise: !isCutout,
);
// Right side with bottom corner
path.lineTo(size.width - Dimens.borderRadiusL, size.height);
path.arcToPoint(
Offset(size.width, size.height - Dimens.borderRadiusL),
radius: circularRadius,
clockwise: false,
);
path.lineTo(size.width, 0);
path.close();
}
canvas.drawPath(path, paint);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) => false;
}