262 lines
6.6 KiB
Dart
262 lines
6.6 KiB
Dart
import 'dart:math';
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import 'dart:typed_data';
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import 'dart:convert';
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import 'package:flutter/material.dart';
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class DrawContext {
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DrawContext();
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// 中心坐标
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//左下角显示的坐标
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double zeroDX = 0;
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double zeroDY = 0;
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//上一次的坐标
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double zeroX = 0;
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double zeroY = 0;
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// 缩放
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double scale = 1;
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double lastScale = 1;
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// 屏幕尺寸
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Size screenSize = const Size(100, 100);
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//暂时没用
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static int unit = 20;
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//弧度
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double angle = 0;
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double lastAngle = 0;
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List<double> grounScaleList = [
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78271.5170,
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39135.7585,
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19567.8792,
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9783.9396,
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4891.9698,
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2445.9849,
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1222.9925,
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611.4962,
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305.7481,
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152.8741,
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76.4370,
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38.2185,
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19.1093,
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9.5546,
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4.7773,
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2.3887,
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1.1943,
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0.5972,
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0.2986,
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0.1493,
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0.0746,
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0.0373,
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0.0187
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];
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// 是否显示标尺
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bool isRuler = false;
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bool isScale = true;
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// 是否显示地图
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bool isMap = true;
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// 坐标点
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List dotList = [];
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// 按下的点
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int? currentDotIndex;
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//暂时没用
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List polyonList = [];
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int polyonExpendIndex = 0;
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// 当前移动的点
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Offset currentDot = const Offset(0, 0);
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//没用
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int groundScaleIndex = 21;
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//偏移坐标
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Offset pos = const Offset(0, 0);
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Offset lastPos = const Offset(0, 0);
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// 控制位移图的大小
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bool isNomal = true;
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double mark = 1000;//显示当前比例尺，因为缩放的原因，比例尺有[8,40,200,1000]；四种，默认倍数是100，那么mark默认1000
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double space = 1;
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List? pointList;
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List<List<double>> gengerateList = [];
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List<Widget> devicePositioned=[];
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/// @param {double} m - 米
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m2px(double m) {
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return m / 20 / scale;
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}
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/// @param {double} px - 像素
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px2m(double px) {
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return px * 20 / scale;
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}
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// x是平面坐标的竖直方向
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/// @param {num} x - 坐标x
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/// @param {num} y - 坐标y
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// xy2Screen(num x, num y, [k = 1]) {
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// double screenx = (y / k * scale - zeroDX);
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// double screeny = (screenSize.height - (x / k * scale - zeroDY));
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// return Offset(screenx, screeny);
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// }
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xy2Screen(num x, num y, [k = 1]) {
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double screenx = (y * k / (scale) - zeroDX);
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double screeny = (screenSize.height - (x * k / (scale) - zeroDY));
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return Offset(screenx, screeny);
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}
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/// @param {screenOffset} x - 屏幕坐标Offset(x,y)
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screen2xy(Offset screenOffset, [k = 1]) {
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// double X = (screenOffset.dy / k * scale + zeroDX);
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// double Y = (screenSize.height - screenOffset.dx / k * scale + zeroDY);
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double Y = (screenOffset.dx+zeroDX)*scale/k;
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double X=(screenSize.height-screenOffset.dy+zeroDY)*scale/k;
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// double X = (screenOffset.dx * k + zeroDX);
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// double Y = (screenSize.height - screenOffset.dy * k + zeroDY);
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return Offset(X, Y);
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}
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//设置缩放
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/// @param {Size} size - (width,height)
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setSize(Size size) {
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screenSize = size;
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if (screenSize != size) {
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setCenter(null);
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lastScale = scale;
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screenSize = size;
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}
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}
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// 设置中心坐标
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// setCenter(obj, [k = 1]) {
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// if (obj != null) {
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// zeroDX = ((obj['y'] * k * scale - screenSize.width / 2).abs())
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// .floor()
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// .toDouble();
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// zeroDY = ((obj['x'] * k * scale - screenSize.height / 2).abs())
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// .floor()
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// .toDouble();
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// zeroX = (obj['x'] * k).toDouble();
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// zeroY = (obj['y'] * k).toDouble();
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// } else {
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// zeroDX =
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// ((zeroY * k * scale - screenSize.width / 2).abs()).floor().toDouble();
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// zeroDY = ((zeroX * k * scale - screenSize.height / 2).abs())
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// .floor()
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// .toDouble();
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// }
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// }
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setCenter(obj, [k = 1]) {
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scale = 1;
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if (obj != null) {
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zeroDX = (((obj["x"] as num) / k / (scale) - screenSize.width / 2).abs())
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.floor()
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.toDouble();
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zeroDY = (((obj["y"] as num) / k / (scale) - screenSize.height / 2).abs())
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.floor()
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.toDouble();
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zeroX = ((obj["x"])).toDouble();
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zeroY = ((obj["y"])).toDouble();
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// print("$zeroDX,$zeroDY");
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} else {
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zeroDX = ((zeroX / k / (scale)- screenSize.width / 2).abs())
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.floor()
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.toDouble();
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zeroDY = ((zeroY / k / (scale) - screenSize.height / 2).abs())
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.floor()
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.toDouble();
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}
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}
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// 没有用
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// getGridStepXY() {
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// double dx = (zeroX % 100) * 20 / scale;
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// double dy = (zeroY % 100) * 20 / scale;
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// double step =
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// scaleList[scale.toInt() - 1 < 0 ? 0 : scale.toInt() - 1] / scale;
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// return GridStepXY(step, dx, dy);
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// }
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setZeroOffset(Offset pos) {
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//移动当前中心
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zeroDX -= pos.dx;
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zeroDY += pos.dy;
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//将偏移值附加给存储的zeroX和Y,保证缩放的时候仍然保留之前的偏移量
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zeroX -=pos.dx*scale ;
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zeroY += pos.dy*scale;
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}
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//设置当前移动点的坐标
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setCurrentDot(Offset offset) {
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currentDot = offset;
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}
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setDotListIndex(Offset offset) {
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dotList[currentDotIndex!] = offset;
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}
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setDotList(List list) {
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dotList = list;
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}
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/// @param {int} index - 下标位置
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setPolyonList(int index, List lists) {
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List arr = [];
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// List arr1 = [];
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for (int i = 0; i < lists.length; i++) {
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Offset list = screen2xy(lists[i]);
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arr.add(list);
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}
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polyonList[index].list = arr;
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}
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// 点到直线得距离
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/// @param {Offset} dot - 3个点
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double dot2Line(Offset dot1, Offset dot2, Offset dot) {
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double A = (dot1.dy - dot2.dy) / (dot1.dx - dot2.dx); //1,2直线的斜率
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double B = dot1.dy - A * dot1.dx; //斜率
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double distance =
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((A * dot.dx + B - dot.dy) / sqrt(A * A + 1)).abs(); //求3和直线1,2的距离
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return distance;
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}
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// 获取地面分辨率的索引，暂时没用
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int getGroundScaleIndex(double sacle) {
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groundScaleIndex = grounScaleList.lastIndexWhere((el) => el > scale) + 1;
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return groundScaleIndex;
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}
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// 获取地面分辨率，暂时没用
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double getGroundScale() {
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return grounScaleList[groundScaleIndex - 1];
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}
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// 点的信息
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pointInfo(Offset point) {
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if (pointList != null && pointList!.isNotEmpty) {
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for (var el in pointList!) {
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double x = ((el['dx'] as double) - point.dx).abs();
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double y = ((el['dy'] as double) - point.dy).abs();
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if (x <= 15 && y <= 15) {
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return el;
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}
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}
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}
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}
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}
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// 暂时没有用
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class GridStepXY {
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double step;
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double dx;
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double dy;
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GridStepXY(this.step, this.dx, this.dy);
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}
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//暂时没用
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class Polyon {
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String label;
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String key;
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bool expend;
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List list;
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Polyon(this.key, this.label, this.list, [this.expend = false]);
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}
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