using DevExpress.Charts.Native;
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using DevExpress.XtraCharts;
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Windows.Forms;
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namespace IStation.WinFormUI
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{
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/// <summary>
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/// 图表框选辅助类
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/// </summary>
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public class ChartBoxSelHelper
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{
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public ChartBoxSelHelper(ChartControl chart)
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{
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_chart = chart;
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_chart.CustomPaint += chartControl_CustomPaint;
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_chart.MouseDown += chartControl_MouseDown;
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_chart.MouseMove += chartControl_MouseMove;
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_chart.MouseUp += chartControl_MouseUp;
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}
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private ChartControl _chart;//图表
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private bool _isStartBoxSelect = false;//是否开始框选
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private Point? _startPoint;//开始点
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private Rectangle? _rect;//矩形
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private Color _rectBdrColor = Color.FromArgb(0, 122, 204);//矩形边框颜色
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private Color _rectBgColor = Color.FromArgb(89, Color.FromArgb(0xbaa500));//矩形背景颜色
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/// <summary>
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/// 框选完成事件
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/// </summary>
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public event Action<MouseEventArgs> BoxSelCompletedEvent;
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/// <summary>
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/// 矩形边框颜色
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/// </summary>
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public Color RectBdColor { get => _rectBdrColor; set => _rectBdrColor = value; }
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/// <summary>
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/// 矩形背景颜色
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/// </summary>
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public Color RectBgColor { get => _rectBgColor; set => _rectBgColor = value; }
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//自定义绘制矩形
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private void chartControl_CustomPaint(object sender, CustomPaintEventArgs e)
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{
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if (!(e is DXCustomPaintEventArgs dxArgs))
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return;
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if (_rect != null)
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{
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dxArgs.Cache.DrawRectangle(_rect.Value, RectBdColor, 1);
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dxArgs.Cache.FillRectangle(RectBgColor, _rect.Value);
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}
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}
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//鼠标按下
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private void chartControl_MouseDown(object sender, MouseEventArgs e)
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{
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if (_isStartBoxSelect)
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{
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_startPoint = e.Location;
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}
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}
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//鼠标移动
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private void chartControl_MouseMove(object sender, MouseEventArgs e)
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{
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if (_isStartBoxSelect && _startPoint != null)
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{
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_rect = GetRectangle(_startPoint.Value, e.Location);
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_chart.Invalidate();
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}
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}
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private Rectangle GetRectangle(Point p1, Point p2)
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{
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int x = p1.X < p2.X ? p1.X : p2.X;
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int y = p1.Y < p2.Y ? p1.Y : p2.Y;
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int width = Math.Abs(p1.X - p2.X);
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int height = Math.Abs(p1.Y - p2.Y);
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return new Rectangle(x, y, width, height);
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}
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private RectangleF GetRectangle(PointF p1, PointF p2)
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{
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float x = p1.X < p2.X ? p1.X : p2.X;
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float y = p1.Y < p2.Y ? p1.Y : p2.Y;
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float width = Math.Abs(p1.X - p2.X);
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float height = Math.Abs(p1.Y - p2.Y);
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return new RectangleF(x, y, width, height);
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}
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//鼠标弹起
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private void chartControl_MouseUp(object sender, MouseEventArgs e)
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{
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_isStartBoxSelect = false;
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_startPoint = null;
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if (_rect != null)
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{
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this.BoxSelCompletedEvent?.Invoke(e);
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}
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}
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/// <summary>
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/// 开始框选
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/// </summary>
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public void StartBoxSel()
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{
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_isStartBoxSelect = true;
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}
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/// <summary>
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/// 关闭框选
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/// </summary>
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public void CloseBoxSel()
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{
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_rect = null;
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_chart.Invalidate();
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}
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//计算时间选中的点
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public List<SeriesPoint> CalcuDataTimeSelSeriesPoints(List<Series> seriesList)
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{
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if (seriesList == null || seriesList.Count < 1)
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return default;
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if (_rect == null)
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return default;
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var chartStartPoint = _rect.Value.Location;
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var chartEndPoint = new Point(_rect.Value.X + _rect.Value.Width, _rect.Value.Y + _rect.Value.Height);
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var xyDiagram = _chart.Diagram as XYDiagram2D;
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var coordiStart = xyDiagram.PointToDiagram(chartStartPoint);
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var coordiEnd = xyDiagram.PointToDiagram(chartEndPoint);
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if (coordiStart.IsEmpty || coordiEnd.IsEmpty)
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return default;
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var start_time = coordiStart.DateTimeArgument;
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var start_value = coordiStart.NumericalValue;
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var end_time = coordiEnd.DateTimeArgument;
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var end_value = coordiEnd.NumericalValue;
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var list = new List<SeriesPoint>();
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foreach (Series series in seriesList)
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{
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foreach (SeriesPoint point in series.Points)
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{
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var dataTime = point.DateTimeArgument;
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if (dataTime >= start_time && dataTime <= end_time)
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{
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var dataValue=point.Values[0];
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if ((dataValue >= start_value && dataValue <= end_value) || (dataValue <= start_value && dataValue >= end_value))
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{
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list.Add(point);
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}
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}
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}
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}
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return list;
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}
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//计算数值选中的点
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public List<SeriesPoint> CalcuNumericalSelSeriesPoints (List<Series> seriesList)
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{
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if (seriesList == null || seriesList.Count < 1)
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return default;
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if (_rect == null)
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return default;
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var chartStartPoint = _rect.Value.Location;
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var chartEndPoint = new Point(_rect.Value.X + _rect.Value.Width, _rect.Value.Y + _rect.Value.Height);
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var xyDiagram = _chart.Diagram as XYDiagram2D;
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var coordiStart = xyDiagram.PointToDiagram(chartStartPoint);
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var coordiEnd = xyDiagram.PointToDiagram(chartEndPoint);
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if (coordiStart.IsEmpty || coordiEnd.IsEmpty)
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return default;
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PointF startPoint = new PointF((float)coordiStart.NumericalArgument, (float)coordiStart.NumericalValue);
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PointF endPoint = new PointF((float)coordiEnd.NumericalArgument, (float)coordiEnd.NumericalValue);
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var bounds = GetRectangle(startPoint, endPoint);
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var list = new List<SeriesPoint>();
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foreach (Series series in seriesList)
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{
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foreach (SeriesPoint point in series.Points)
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{
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float x = (float)point.NumericalArgument;
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float y = (float)point.Values[0];
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if (bounds.Contains(x, y))
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{
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list.Add(point);
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}
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}
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}
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return list;
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}
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}
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}
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