85 lines
2.4 KiB
Dart
85 lines
2.4 KiB
Dart
import 'package:flutter/material.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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@immutable
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class Coordinate {
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final double step;
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final double strokeWidth;
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final Color axisColor;
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final Color gridColor;
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Coordinate(
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{this.step = 20,
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this.strokeWidth = .5,
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this.axisColor = Colors.blue,
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this.gridColor = Colors.grey});
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final Paint _gridPaint = Paint();
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void paint(Canvas canvas, Size size) {
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canvas.save();
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canvas.translate(size.width / 2, size.height / 2);
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_drawGrid(canvas, size);
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_drawAxis(canvas, size);
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canvas.restore();
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}
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void _drawGrid(Canvas canvas, Size size) {
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_gridPaint
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..style = PaintingStyle.stroke
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..strokeWidth = .5
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..color = Colors.grey;
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_drawBottomRight(canvas, size);
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canvas.save();
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canvas.scale(1, -1); //沿x轴镜像
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_drawBottomRight(canvas, size);
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canvas.restore();
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canvas.save();
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canvas.scale(-1, 1); //沿y轴镜像
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_drawBottomRight(canvas, size);
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canvas.restore();
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canvas.save();
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canvas.scale(-1, -1); //沿原点镜像
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_drawBottomRight(canvas, size);
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canvas.restore();
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}
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void _drawAxis(Canvas canvas, Size size) {
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_gridPaint
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..color = Colors.blue
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..strokeWidth = 1.5;
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canvas.drawLine(
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Offset(-size.width / 2, 0), Offset(size.width / 2, 0), _gridPaint);
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canvas.drawLine(
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Offset(0, -size.height / 2), Offset(0, size.height / 2), _gridPaint);
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canvas.drawLine(Offset(0, size.height / 2),
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Offset(0 - 7.0, size.height / 2 - 10), _gridPaint);
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canvas.drawLine(Offset(0, size.height / 2),
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Offset(0 + 7.0, size.height / 2 - 10), _gridPaint);
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canvas.drawLine(
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Offset(size.width / 2, 0), Offset(size.width / 2 - 10, 7), _gridPaint);
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canvas.drawLine(
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Offset(size.width / 2, 0), Offset(size.width / 2 - 10, -7), _gridPaint);
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}
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void _drawBottomRight(Canvas canvas, Size size) {
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canvas.save();
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for (int i = 0; i < size.height / 2 / step; i++) {
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canvas.drawLine(Offset(0, 0), Offset(size.width / 2, 0), _gridPaint);
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canvas.translate(0, step);
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}
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canvas.restore();
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canvas.save();
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for (int i = 0; i < size.width / 2 / step; i++) {
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canvas.drawLine(Offset(0, 0), Offset(0, size.height / 2), _gridPaint);
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canvas.translate(step , 0);
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}
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canvas.restore();
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}
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}
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