WinFrom .NET TeeChart滾動縮放功能 按鈕縮放功能開發

對TeeChart控件進行縮放功能添加

該功能是在已經繪圖之後

1，添加按鈕縮放功能

首先在視圖設計器上添加按鈕控件

爲按鈕添加響應函數

private void zoombtnClick(object sender, EventArgs e)
        {
            //double XMid = ((CursorTool)tChart1.Tools[0]).XValue;
            double OldXMin = tChart1.Axes.Bottom.Minimum;
            double OldXMax = tChart1.Axes.Bottom.Maximum;
            double XMid = (OldXMin + OldXMax)/2;
            double NewXMin = (XMid * 0.5 + OldXMin) / (1.5);
            double NewXMax = (XMid * 0.5 + OldXMax) / (1.5);
            tChart1.Axes.Bottom.SetMinMax(NewXMin, NewXMax);
        }

        private void undobtnClick(object sender, EventArgs e)
        {
            //double XMid = ((CursorTool)tChart1.Tools[0]).XValue;
            double OldXMin = tChart1.Axes.Bottom.Minimum;
            double OldXMax = tChart1.Axes.Bottom.Maximum;
            double XMid = (OldXMin + OldXMax) / 2;
            double NewXMin = (-XMid * 0.5 + OldXMin) / (0.5);
            double NewXMax = (-XMid * 0.5 + OldXMax) / (0.5);
            tChart1.Axes.Bottom.SetMinMax(NewXMin, NewXMax);
        }

2.滾動縮放功能，這個功能中需要獲取鼠標位置，直接通過tchart1中的標籤位置獲取

double XMid = ((CursorTool)tChart1.Tools[0]).XValue;

爲TeeChart添加滾動響應，TeeChart.dll中沒有該事件，添加系統System.Windows.Forms.中的

this.tChart1.MouseWheel += new System.Windows.Forms.MouseEventHandler(this.tChart1_MouseWheel);

相應的響應函數爲

private void tChart1_MouseWheel(object sender, MouseEventArgs e)
        {
            if (tChart1 != null)
            {
                double XMid = ((CursorTool)tChart1.Tools[0]).XValue;
                if (e.Delta > 0)
                {
                    double OldXMin = tChart1.Axes.Bottom.Minimum;
                    double OldXMax = tChart1.Axes.Bottom.Maximum;
                    double NewXMin = (XMid * 0.5 + OldXMin) / (1.5);
                    double NewXMax = (XMid * 0.5 + OldXMax) / (1.5);
                    tChart1.Axes.Bottom.SetMinMax(NewXMin, NewXMax);
                }
                else
                {
                    double OldXMin = tChart1.Axes.Bottom.Minimum;
                    double OldXMax = tChart1.Axes.Bottom.Maximum;
                    double NewXMin = (-XMid * 0.5 + OldXMin) / (0.5);
                    double NewXMax = (-XMid * 0.5 + OldXMax) / (0.5);
                    tChart1.Axes.Bottom.SetMinMax(NewXMin, NewXMax);
                }
            }
        }

感謝https://bbs.csdn.net/topics/110021766作者。