40 lines
1.2 KiB
Dart
40 lines
1.2 KiB
Dart
import 'package:flutter/material.dart';
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class CheckeredPainter extends CustomPainter {
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final Paint lightPaint, darkPaint;
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final double checkSize;
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final Offset offset;
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CheckeredPainter({
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Color light = const Color(0xFF999999),
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Color dark = const Color(0xFF666666),
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this.checkSize = 20,
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this.offset = Offset.zero,
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}) : lightPaint = Paint()..color = light,
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darkPaint = Paint()..color = dark;
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@override
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void paint(Canvas canvas, Size size) {
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final background = Offset.zero & size;
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canvas.drawRect(background, lightPaint);
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final dx = offset.dx % (checkSize * 2);
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final dy = offset.dy % (checkSize * 2);
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final xMax = (size.width / checkSize).ceil();
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final yMax = (size.height / checkSize).ceil();
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for (var x = -2; x < xMax; x++) {
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for (var y = -2; y < yMax; y++) {
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if ((x + y) % 2 == 0) {
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final check = Rect.fromLTWH(dx + x * checkSize, dy + y * checkSize, checkSize, checkSize);
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if (check.overlaps(background)) {
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canvas.drawRect(check.intersect(background), darkPaint);
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}
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}
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}
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}
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}
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@override
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bool shouldRepaint(covariant CustomPainter oldDelegate) => false;
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}
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