125 lines
3.5 KiB
Dart
125 lines
3.5 KiB
Dart
import 'package:graphs/src/graph.dart';
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import 'package:flutter/material.dart';
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import 'dart:math';
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class CurvePainter extends CustomPainter {
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CurvePainter({
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Key? key,
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required this.gr,
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});
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Graphs gr;
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final double rad = 7;
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final double width = 4;
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final Color col = Colors.black;
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final double aboveHeight = 5;
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double circleRad = 100;
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final TextStyle textStyle = const TextStyle(
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color: Colors.black,
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fontSize: 21,
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);
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void drawLine(Canvas canvas, Offset p1, Offset p2) {
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Paint p = Paint();
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p.color = col;
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p.strokeWidth = width;
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canvas.drawLine(p1, p2, p);
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}
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void drawDot(Canvas canvas, Offset p1) {
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var p = Paint();
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p.color = col;
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p.strokeWidth = width + 1;
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canvas.drawCircle(p1, rad, p);
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}
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TextSpan _getTextSpan(String s) => TextSpan(text: s, style: textStyle);
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TextPainter _getTextPainter(String s) => TextPainter(
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text: _getTextSpan(s),
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textDirection: TextDirection.ltr,
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textAlign: TextAlign.center);
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void drawAboveText(Canvas canvas, Offset size, String s) {
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var textPainter = _getTextPainter(s);
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textPainter.layout();
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textPainter.paint(
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canvas,
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Offset((size.dx - textPainter.width),
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(size.dy - textPainter.height) - aboveHeight));
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}
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Graphs getGraph() {
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List<Dot> d = <Dot>[];
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d.add(Dot.fromTwoLists("1", [2, 3], [1, 1]));
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d.add(Dot.fromTwoLists("2", [1, 3], [1, 1]));
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d.add(Dot.fromTwoLists("3", [1, 2], [1, 1]));
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d.add(Dot.fromTwoLists("Name1", [], []));
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d.add(Dot.fromTwoLists("Name2", [], []));
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return Graphs.fromList("1", d, false, false);
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}
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Map<int, Offset> getDotPos(int dotsAm, Size size) {
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Map<int, Offset> off = <int, Offset>{};
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var width = size.width / 2;
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var height = size.height / 2;
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for (int i = 0; i < dotsAm; i++) {
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double x = cos(2 * pi * i / dotsAm) * circleRad + width;
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double y = sin(2 * pi * i / dotsAm) * circleRad + height;
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off[i + 1] = Offset(x, y);
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}
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//print(off);
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return off;
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}
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void drawConnections(Canvas canvas, List<Dot> dots, Map<int, Offset> off) {
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for (var i in dots) {
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var list = i.getL();
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var beg = off[i.num];
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for (var d in list.keys) {
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drawLine(canvas, beg!, off[d]!);
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}
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}
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}
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@override
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void paint(Canvas canvas, Size size) {
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if (size.width > size.height) {
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circleRad = size.height / 3;
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} else {
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circleRad = size.width / 3;
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}
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var paint = Paint();
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//drawLine(canvas, Offset(0, size.height / 2),
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//Offset(size.width, size.height / 2));
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//gr = getGraph();
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var off = getDotPos(gr.getDotAmount(), size);
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for (int i = 0; i < off.length; i++) {
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drawDot(canvas, off[i + 1]!);
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drawAboveText(
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canvas, off[i + 1]!, "${gr.getDots()[i].getName()}:[${i + 1}]");
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}
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drawConnections(canvas, gr.getDots(), off);
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paint.color = Colors.blue;
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paint.style = PaintingStyle.stroke;
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//drawDot(canvas, Offset(size.width / 2, size.height / 2));
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//drawAboveText(canvas, size, "sssssssssssss");
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//_drawTextAt("Assss", Offset(size.width / 2, size.height / 2), canvas);
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paint.color = Colors.green;
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}
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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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/*void _drawTextAt(String txt, Offset position, Canvas canvas) {
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final textPainter = getTextPainter(txt);
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textPainter.layout(minWidth: 0, maxWidth: 0);
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Offset drawPosition =
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Offset(position.dx, position.dy - (textPainter.height / 2));
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textPainter.paint(canvas, drawPosition);
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}*/
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}
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