77 lines
2.3 KiB
Dart
77 lines
2.3 KiB
Dart
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import 'dart:math';
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import 'package:flutter/material.dart';
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import 'circular_slider_paint.dart' show CircularSliderMode;
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import 'utils.dart';
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class SliderPainter extends CustomPainter {
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CircularSliderMode mode;
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double startAngle;
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double endAngle;
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double sweepAngle;
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Color selectionColor;
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Color handlerColor;
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double handlerOutterRadius;
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bool showRoundedCapInSelection;
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bool showHandlerOutter;
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double sliderStrokeWidth;
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Offset initHandler;
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Offset endHandler;
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Offset center;
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double radius;
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SliderPainter({
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@required this.mode,
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@required this.startAngle,
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@required this.endAngle,
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@required this.sweepAngle,
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@required this.selectionColor,
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@required this.handlerColor,
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@required this.handlerOutterRadius,
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@required this.showRoundedCapInSelection,
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@required this.showHandlerOutter,
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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 progress = _getPaint(color: selectionColor);
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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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canvas.drawArc(Rect.fromCircle(center: center, radius: radius),
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-pi / 2 + startAngle, sweepAngle, false, progress);
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Paint handler = _getPaint(color: handlerColor, style: PaintingStyle.fill);
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Paint handlerOutter = _getPaint(color: handlerColor, width: 2.0);
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// draw handlers
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if (mode == CircularSliderMode.doubleHandler) {
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initHandler = radiansToCoordinates(center, -pi / 2 + startAngle, radius);
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canvas.drawCircle(initHandler, 8.0, handler);
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canvas.drawCircle(initHandler, handlerOutterRadius, handlerOutter);
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}
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endHandler = radiansToCoordinates(center, -pi / 2 + endAngle, radius);
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canvas.drawCircle(endHandler, 8.0, handler);
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if (showHandlerOutter) {
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canvas.drawCircle(endHandler, handlerOutterRadius, handlerOutter);
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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 =
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showRoundedCapInSelection ? StrokeCap.round : StrokeCap.butt
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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 true;
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}
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}
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