115 lines
2.6 KiB
Dart
115 lines
2.6 KiB
Dart
import 'dart:math';
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import 'dart:ui';
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import 'package:flutter/cupertino.dart';
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import 'package:flutter/material.dart';
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import 'dart:ui'as ui;
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import '../components/coordinate_pro.dart';
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/// create by 张风捷特烈 on 2020/5/1
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/// contact me by email 1981462002@qq.com
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/// 说明:
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class Paper extends StatelessWidget {
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const Paper({super.key});
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@override
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Widget build(BuildContext context) {
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return Container(
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color: Colors.white,
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child: CustomPaint(
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// 使用CustomPaint
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painter: PaperPainter(),
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),
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);
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}
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}
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class PaperPainter extends CustomPainter {
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final Coordinate coordinate = Coordinate();
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final List<Offset> points = [];
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final double step = 1;
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final double min = 0;
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final double max = 360;
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void initPoints() {
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for (double x = min; x <= max; x += step) {
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points.add(Offset(x, f(x)));
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// double thta = (pi / 180 * x);
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// var p = f(thta);
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// points.add(Offset(p * cos(thta), p * sin(thta)));
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}
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}
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void initPointsWithPolar() {
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for (double x = min; x <= max; x += step) {
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double thta = (pi / 180 * x); // 角度转化为弧度
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var p = f(thta);
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points.add(Offset(p * cos(thta), p * sin(thta)));
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}
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}
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// double f(double x) {
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// double y = -x * x / 200 + 100;
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// return y;
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// }
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// double f(double thta) {
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// double p = 10 * thta;
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// return p;
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// }
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// double f(double thta) {
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// double p = 100 * (1-cos(thta));
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// return p;
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// }
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// double f(double thta) {
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// double p = 150*sin(5*thta).abs();
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// return p;
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// }
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double f(double thta) { // 100*(1-4*sinθ)
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double p = 50*(pow(e,cos(thta)) - 2 * cos(4 * thta) +pow(sin(thta / 12), 5));
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return p;
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}
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@override
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void paint(Canvas canvas, Size size) {
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coordinate.paint(canvas, size);
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canvas.translate(size.width / 2, size.height / 2);
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// initPoints();
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initPointsWithPolar();
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Path path = Path();
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Paint paint = Paint()
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..color = Colors.red
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..strokeWidth = 1.5
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..style = PaintingStyle.stroke;
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var colors = [
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Color(0xFFF60C0C),
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Color(0xFFF3B913),
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Color(0xFFE7F716),
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Color(0xFF3DF30B),
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Color(0xFF0DF6EF),
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Color(0xFF0829FB),
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Color(0xFFB709F4),
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];
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var pos = [1.0 / 7, 2.0 / 7, 3.0 / 7, 4.0 / 7, 5.0 / 7, 6.0 / 7, 1.0];
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paint.shader = ui.Gradient.linear(
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Offset(0, 0), Offset(100, 0), colors, pos,TileMode.mirror);
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// canvas.drawPoints(PointMode.points, points, paint);
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canvas.drawPoints(PointMode.polygon, points, paint);
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}
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@override
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bool shouldRepaint(CustomPainter oldDelegate) => false;
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}
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