77 lines
2.0 KiB
Dart
77 lines
2.0 KiB
Dart
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'utils.dart';
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class BasePainter extends CustomPainter {
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Color baseColor;
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Color selectionColor;
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int primarySectors;
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int secondarySectors;
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double sliderStrokeWidth;
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Offset center;
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double radius;
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BasePainter({
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@required this.baseColor,
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@required this.selectionColor,
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@required this.primarySectors,
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@required this.secondarySectors,
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@required this.sliderStrokeWidth,
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});
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@override
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void paint(Canvas canvas, Size size) {
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Paint base = _getPaint(color: baseColor);
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center = Offset(size.width / 2, size.height / 2);
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radius = min(size.width / 2, size.height / 2) - sliderStrokeWidth;
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// we need this in the parent to calculate if the user clicks on the circumference
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assert(radius > 0);
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canvas.drawCircle(center, radius, base);
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if (primarySectors > 0) {
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_paintSectors(primarySectors, 8.0, selectionColor, canvas);
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}
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if (secondarySectors > 0) {
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_paintSectors(secondarySectors, 6.0, baseColor, canvas);
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}
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}
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void _paintSectors(
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int sectors, double radiusPadding, Color color, Canvas canvas) {
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Paint section = _getPaint(color: color, width: 2.0);
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var endSectors =
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getSectionsCoordinatesInCircle(center, radius + radiusPadding, sectors);
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var initSectors =
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getSectionsCoordinatesInCircle(center, radius - radiusPadding, sectors);
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_paintLines(canvas, initSectors, endSectors, section);
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}
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void _paintLines(
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Canvas canvas, List<Offset> inits, List<Offset> ends, Paint section) {
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assert(inits.length == ends.length && inits.length > 0);
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for (var i = 0; i < inits.length; i++) {
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canvas.drawLine(inits[i], ends[i], section);
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}
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}
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Paint _getPaint({@required Color color, double width, PaintingStyle style}) =>
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Paint()
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..color = color
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..strokeCap = StrokeCap.round
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..style = style ?? PaintingStyle.stroke
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..strokeWidth = width ?? sliderStrokeWidth;
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@override
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bool shouldRepaint(CustomPainter oldDelegate) {
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return false;
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}
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}
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