C# mschart 控件 框选 删除部分数据
实现功能 ：
1、鼠标框选，选中chart控件中部分数据；
2、将选中的数据标红显示；
3、删除选中的红色数据；
demo源码下载：https://github.com/DamonDBT/CsharpDemo5
核心代码说明：
1、对画图区域的设置，首先说明chart控件的面积问题。对于下图中的一个chart，有2个Position控制面积大小，
//写在窗体的load内：
//设置范围区域，很重要！
ChartArea ca = this.chart1.ChartAreas[0];
//设置画图的大小，这个是带有X Y 轴 的面积
ca.Position.Auto = false;
ca.Position.Height = 100F;//为了方便，设置100%
ca.Position.Width = 100F;
//设置内部不包含X Y 轴的比例，
ca.InnerPlotPosition.Auto = false;
ca.InnerPlotPosition.Height = 90F;
ca.InnerPlotPosition.Width = 97F;
ca.InnerPlotPosition.X = 3F;//给左侧Y轴留下空间
ca.InnerPlotPosition.Y = 3F;//给上面顶部留点空间，根据上面的说明，按照代码中的设置，每个点的位置，只要根据chart控件的大小，和innerplotposition的比例，可以计算每个点的实际坐标，和鼠标的框选区域坐标进行对比，确定选中的点。
2、坐标换算
//把数据值换算到坐标中，要特别注意。
float x =this.chart1.Width*( ca.InnerPlotPosition.X + item.Key * (ca.InnerPlotPosition.Width / this.maxCount))/100;
float y = this.chart1.Height * (ca.InnerPlotPosition.Y + (float)(maxValue-item.Value) * (ca.InnerPlotPosition.Height / (float)(maxValue-minValue))) / 100;
3、游标使用，CursorX CursorY ,可以实现对选中区域的最大化放大，
chartArea1.CursorX.IsUserEnabled = true;
chartArea1.CursorX.IsUserSelectionEnabled = true;
chartArea1.CursorX.SelectionColor = System.Drawing.Color.Red;
chartArea1.CursorY.IsUserEnabled = true;
chartArea1.CursorY.IsUserSelectionEnabled = true;
4、源码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;
namespace ChartSelectPoint
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
Dictionary<int, double> dicData = new Dictionary<int, double>();
private void timer1_Tick(object sender, EventArgs e)
{
if (this.chart1.Series[0].Points.Count < 20)
{
this.chart1.Series[0].Points.AddXY(count, ra.Next(0, 50));
this.chart1.ChartAreas[0].AxisX.Minimum = 0;
this.chart1.ChartAreas[0].AxisX.Maximum = 19;
}
else
{
this.chart1.Series[0].Points.RemoveAt(0);
this.chart1.Series[0].Points.AddXY(count, ra.Next(0, 50));
this.chart1.ChartAreas[0].AxisX.Minimum = this.chart1.Series[0].Points[0].XValue;
this.chart1.ChartAreas[0].AxisX.Maximum = this.chart1.Series[0].Points[19].XValue;
}
count++;
}
int count = 0;
Random ra = new Random();
private int maxCount = 60;
private void Form1_Load(object sender, EventArgs e)
{
//1 数据滚动显示
//timer1.Interval = 100;
//timer1.Enabled = true;
//设置范围区域，很重要！
ChartArea ca = this.chart1.ChartAreas[0];
//设置画图的大小，这个是带有X Y 轴 的面积
ca.Position.Auto = false;
ca.Position.Height = 100F;//为了方便，设置100%
ca.Position.Width = 100F;
//设置内部不包含X Y 轴的比例，
ca.InnerPlotPosition.Auto = false;
ca.InnerPlotPosition.Height = 90F;
ca.InnerPlotPosition.Width = 97F;
ca.InnerPlotPosition.X = 3F;//给左侧Y轴留下空间
ca.InnerPlotPosition.Y = 3F;//给上面顶部留点空间，
//数据初始化
for (int i = 0; i < this.maxCount; i++)
{
var v = ra.Next(0, 50);
dicData.Add(i, v);
this.chart1.Series[0].Points.AddXY(i, v);
}
}
private void chart1_SelectionRangeChanged(object sender, CursorEventArgs e)
{
//获得区域的点
MessageBox.Show("游标" + e.NewSelectionStart + " " + e.NewSelectionEnd);
}
Point start = new Point();
Point end = new Point();
private void chart1_MouseDown(object sender, MouseEventArgs e)
{
start.X = e.X;
start.Y = e.Y;
}
private void chart1_MouseUp(object sender, MouseEventArgs e)
{
//return;
end.X = e.X;
end.Y = e.Y;
//TODO 1、坐标计算！！！！ 是重点 ,开始，停止的 X Y ，各个点的X Y
Dictionary<int, double> dicDataSave = new Dictionary<int, double>();
Dictionary<int, double> dicDataDel = new Dictionary<int, double>();
double minValue = (from d in dicData.Values select d).ToList().Min();
double maxValue= (from d in dicData.Values select d).ToList().Max();
int dicCount = 0;
foreach (KeyValuePair<int, double> item in dicData)
{
ChartArea ca = this.chart1.ChartAreas[0];
//把数据值换算到坐标中，要特别注意。
float x =this.chart1.Width*( ca.InnerPlotPosition.X + item.Key * (ca.InnerPlotPosition.Width / this.maxCount))/100;
float y = this.chart1.Height * (ca.InnerPlotPosition.Y + (float)(maxValue-item.Value) * (ca.InnerPlotPosition.Height / (float)(maxValue-minValue))) / 100;
float minx = start.X < end.X ? start.X : end.X;
float maxx = start.X < end.X ? end.X : start.X;
float miny = start.Y < end.Y ? start.Y : end.Y;
float maxy = start.Y < end.Y ? end.Y : start.Y;
bool isSave = true;
if (x >minx && x < maxx)
{
if (y > miny && y < maxy)
{
isSave = false;
dicDataDel.Add(item.Key, item.Value);
this.chart1.Series[0].Points[dicCount].Color = Color.Red;
}
}
if (isSave)
{
dicDataSave.Add(item.Key, item.Value);
}
dicCount++;
}
dicData = dicDataSave;
if (MessageBox.Show("确定删除红色的点 ?", "提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning)
== DialogResult.OK)
{
this.chart1.Series[0].Points.Clear();
foreach (KeyValuePair<int, double> item in dicData)
{
this.chart1.Series[0].Points.AddXY(item.Key, item.Value);
}
}
}
private void chart1_MouseMove(object sender, MouseEventArgs e)
{
//TODO 在拉动的过程中，增加方框虚线
//鼠标移动到值上，显示数值
//HitTestResult myTestResult = chart1.HitTest(e.X, e.Y);
//if (myTestResult.ChartElementType == ChartElementType.DataPoint)
//{
// this.Cursor = Cursors.Cross;
// int i = myTestResult.PointIndex;
// DataPoint dp = myTestResult.Series.Points[i];
// double doubleXValue = (dp.XValue);
// double doubleYValue = dp.YValues[0];
// //自我实现值的显示
// this.textBox1.Text = doubleXValue.ToString();
//}
//else
//{
// this.Cursor = Cursors.Default;
//}
}
private void DrawLine()
{
}
private void chart1_GetToolTipText(object sender, System.Windows.Forms.DataVisualization.Charting.ToolTipEventArgs e)
{
//鼠标移动到值上，显示数值
if (e.HitTestResult.ChartElementType == ChartElementType.DataPoint)
{
this.Cursor = Cursors.Cross;
int i = e.HitTestResult.PointIndex;
DataPoint dp = e.HitTestResult.Series.Points[i];
e.Text = string.Format("数值:{1:F3}" + e.HitTestResult.Series.ChartArea + " \n日期:{0}", DateTime.FromOADate(dp.XValue), dp.YValues[0]);
}
else
{
this.Cursor = Cursors.Default;
}
}
}
}