55 lines
1.4 KiB
Dart
55 lines
1.4 KiB
Dart
import 'dart:math';
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import 'package:flutter/material.dart';
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class OnboardingIndicatorPainter extends CustomPainter {
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final int pageCount;
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final int currentPage;
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final Color activeColor;
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final Color inactiveColor;
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final double strokeWidth;
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OnboardingIndicatorPainter({
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required this.pageCount,
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required this.currentPage,
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required this.activeColor,
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required this.inactiveColor,
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this.strokeWidth = 4.0,
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});
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@override
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void paint(Canvas canvas, Size size) {
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final center = Offset(size.width / 2, size.height / 2);
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final radius = min(size.width, size.height) / 2;
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const double gapInDegrees = 30.0;
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const double gapInRadians = gapInDegrees * (pi / 180);
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const double arcAngle = (pi / 2) - gapInRadians;
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final startAngles = [-pi / 2, 0.0, pi / 2, pi];
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for (int i = 0; i < pageCount; i++) {
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final paint = Paint()
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..color = (i == currentPage) ? activeColor : inactiveColor
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..style = PaintingStyle.stroke
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..strokeWidth = strokeWidth
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..strokeCap = StrokeCap.round;
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final correctedStartAngle = startAngles[i] + (gapInRadians / 2);
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canvas.drawArc(
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Rect.fromCircle(center: center, radius: radius),
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correctedStartAngle,
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arcAngle,
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false,
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paint,
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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) {
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return true;
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}
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}
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