c# 多个chart 纵坐标轴范围鼠标滚轮放大和缩小，拖动横纵坐标十字光标查看数据。
窗体的Designer.cs文件下的InitializeComponent()函数中添加： this.chart1.MouseWheel +=System.Windows.Forms.MouseEventHandler(this.chart1_MouseWheel);
chart2 的鼠标滚轮事件：
this.chart2.Click += new System.EventHandler(this.chart2_Click);
this.chart2.DoubleClick += new System.EventHandler(this.chart2_DoubleClick);
this.chart2.MouseClick += new System.Windows.Forms.MouseEventHandler(this.chart2_MouseClick);
this.chart2.MouseDown += new System.Windows.Forms.MouseEventHandler(this.chart2_MouseDown);
this.chart2.MouseMove += new System.Windows.Forms.MouseEventHandler(this.chart2_MouseMove);
this.chart2.MouseUp += new System.Windows.Forms.MouseEventHandler(this.chart2_MouseUp);
this.chart2.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.chart2_MouseWheel);
private Series dragSeries = null; // 拖拽的Series对象
private int dragIndex = -1; // 拖拽的Series对象的数据点索引
private int dragOffset = 0; // 鼠标点击位置相对于数据点的Y值偏移量
// 定义两个全局变量
public bool isMouseDown = false;
public int lastMoveX = 0, lastMoveY=0; //用于记录鼠标上次移动的点，用于判断是左移还是右移
private void chart1_MouseDown(object sender, MouseEventArgs e)
{
HitTestResult result = chart1.HitTest(e.X, e.Y);
if (result.ChartElementType == ChartElementType.DataPoint)
{
dragSeries = result.Series;
dragIndex = result.PointIndex;
dragOffset = (int)(dragSeries.Points[dragIndex].YValues[0] - chart1.ChartAreas[0].AxisY.PixelPositionToValue(e.Y));
}
else
{
dragSeries = null;
}
isMouseDown = true;
lastMoveX = 0; lastMoveY = 0;
}
private void chart1_MouseMove(object sender, MouseEventArgs e)
{
try
{
var areaC = chart1.ChartAreas[0];
double axisxValue = areaC.AxisX.PixelPositionToValue(e.X);
double axisyValue = areaC.AxisY.PixelPositionToValue(e.Y);
textBox_chartEdit.Text = string.Format("{0:F0},{1:F0}", axisxValue, axisyValue);//
areaC.CursorX.IsUserEnabled = true;
areaC.CursorY.IsUserEnabled = true;//十字光标
areaC.CursorX.SetCursorPixelPosition(new PointF(e.X, e.Y), true);
areaC.CursorY.SetCursorPixelPosition(new PointF(e.X, e.Y), true);
}
catch { }
if (dragSeries != null && dragIndex >= 0)
{
double yValue = 0;
try
{
yValue = chart1.ChartAreas[0].AxisY.PixelPositionToValue(e.Y + dragOffset);
}
catch (Exception err)
{
// if (serialPort1.IsOpen == true) serialPort1.Close();
//MessageBox.Show(err.ToString(), "系统提示"); //不能重复打开
}
dragSeries.Points[dragIndex].YValues[0] = Math.Round(yValue, 2);//保留2位小数
chart1.Invalidate();
if (dragIndex >= 0 && dragIndex < List_temprature.Count) // List_ib.Count)
{
float y = (float)Math.Round(yValue, 2);//保留2位小数
List_temprature[dragIndex] = y;// (float)yValue;// List_ib[dragIndex] = (float)yValue;
temprature_curve[dragIndex] = y;// (float)yValue;
}
}
else
{
HitTestResult Result = new HitTestResult();
Result = chart1.HitTest(e.X, e.Y);
if (Result.Series != null && Result.Object != null)
{
// 获取当前焦点x轴的值
//string xValue = ObjectUtil.GetPropertyValue(Result.Object, "AxisLabel").ToString();
//// 获取当前焦点所属区域名称
//string areaName = ObjectUtil.GetPropertyValue(Result.Object, "LegendText").ToString();
// 获取当前焦点y轴的值
if (Result.PointIndex < 0 || Result.Series.Points.Count <= Result.PointIndex)
return; //Result.PointIndex = 0;// https://blog.csdn.net/tingchenchen/article/details/129791012
double yValue = Result.Series.Points[Result.PointIndex].YValues[0];
// 鼠标经过时label显示
//label_chart.Text = "时间：" + xValue + "\n" + areaName + "：" + yValue + "ug/m^3";
label_chart.Location = new Point(e.X, e.Y - 20);
var area = chart1.ChartAreas[0];
double xxValue = area.AxisX.PixelPositionToValue(e.X);
double yyValue = area.AxisY.PixelPositionToValue(e.Y);
label_chart.Text = string.Format("{0:F0},{1:F1}", xxValue, yyValue);
chart1.Series[0].ToolTip = "X：#VALX\nY：#VALY";
label_chart.Visible = true;
}
else
{
// 鼠标离开时label隐藏
label_chart.Visible = false;
//https://blog.csdn.net/baidu_41651935/article/details/118943228
}
if (isMouseDown)//鼠标拖动横坐标移动
{
chartArea = chart1.ChartAreas[0];
MIN_Y = (int)chartArea.AxisY.Minimum;
MAX_Y = (int)chartArea.AxisY.Maximum;//
// 设置不显示chart自带的滚动条
chart1.ChartAreas[0].AxisX.ScrollBar.Enabled = false;
chart1.ChartAreas[0].AxisY.ScrollBar.Enabled = false;
// 可更改（交换）如下加减1或if条件来设置鼠标移动时曲线移动方向
int xMove = Math.Abs(e.X - lastMoveX);
int yMove = Math.Abs(e.Y - lastMoveY);
if (xMove > yMove)
{
//if (lastMove > 10 && e.X - lastMove > 0)
if (lastMoveX > 10 && e.X - lastMoveX > 0)
{
MAX_X+=xMove； //MAX_X++; MIN_X++;
chart1.ChartAreas[0].AxisX.ScaleView.Position += xMove ; // 每次移动1
}
else if (lastMoveX > 10 && e.X - lastMoveX < 0)
{
//MIN_X+=xMove； //
MAX_X+=xMove； //MAX_X--; MIN_X--;
chart1.ChartAreas[0].AxisX.ScaleView.Position -= xMove ; // 每次移动1
}
}
else
{
if (lastMoveY > 10 && e.Y - lastMoveY > 0)
{
MAX_Y+=yMove； //MAX_Y++; MIN_Y++;
chart1.ChartAreas[0].AxisY.ScaleView.Position += yMove ; // 每次移动1
}
else if (lastMoveY > 10 && e.Y - lastMoveY < 0)
{
MAX_Y-=yMove； //MAX_Y--; MIN_Y--;
chart1.ChartAreas[0].AxisY.ScaleView.Position -= yMove ; // 每次移动1
}
}
lastMoveX = e.X;
lastMoveY = e.Y;
//chartArea.AxisX.Maximum = Math.Round(MAX_X);
// chartArea.AxisY.Maximum = Math.Round(MAX_Y);
}
}
}
private void chart1_MouseUp(object sender, MouseEventArgs e)
{
dragSeries = null;
dragIndex = -1;
isMouseDown = false;
}
private void chart1_MouseWheel(object sender, MouseEventArgs e)
{
//当e.Delta > 0时鼠标滚轮是向上滚动，e.Delta < 0时鼠标滚轮向下滚动
int Ymax = (int)chart1.ChartAreas[0].AxisY.Maximum;
chartArea =chart1.ChartAreas[0];
MIN_Y =(int) chartArea.AxisY.Minimum ;
MAX_Y = (int)chartArea.AxisY.Maximum;
if (e.Delta > 0)//滚轮向上
{
ZoomIn(); //放大
//MessageBox.Show("鼠标向上滑动");
}
else
{
ZoomOut();//缩小
//MessageBox.Show("鼠标向下滑动");
}
}
public void ZoomIn()
{
MAX_Y += 0.1f * MAX_Y;
if(MIN_Y>1) MIN_Y -= 0.1f * MIN_Y;
//chart1.ChartAreas[0].AxisY.Maximum = Math.Round(MAX_Y);
chartArea.AxisY.Maximum = Math.Round(MAX_Y);
}
//沿中心缩放：缩小
public void ZoomOut()
{
if(MAX_Y*0.9f > MIN_Y+1) MAX_Y -= 0.1f * MAX_Y;
if (MIN_Y * 1.1f+1 < MAX_Y) MIN_Y += 0.1f * MIN_Y+1;
//chart1.ChartAreas[0].AxisY.Maximum = Math.Round(MAX_Y);
chartArea.AxisY.Maximum = Math.Round(MAX_Y);
}
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