Question

我正在开发一个带有Windows窗体图表的WindowsFormsHost的WPF应用程序。我已经实现了以下代码，允许通过鼠标滚轮进行缩放。

int deltaScrollTotal;
private void chart_MouseWheel(object sender, System.Windows.Forms.MouseEventArgs e)
{
    //System.Windows.Forms.MessageBox.Show("ECEMT");
    int maxChangeRange = 21;
    int minChangeRange = -1;

    int deltaScroll = e.Delta / Math.Abs(e.Delta);
    deltaScrollTotal += deltaScrollTotal + deltaScroll > minChangeRange
                     && deltaScrollTotal + deltaScroll < maxChangeRange
                      ? deltaScroll : 0;
    // Additional calculation in order to obtain pseudo
    // "positional zoom" feature
    double minXScale = (double)e.X / (double)MyWinformChart.Width;
    double maxXScale = 1 - minXScale;
    double minYScale = (double)e.Y / (double)MyWinformChart.Height;
    double maxYScale = 1 - minYScale;

    // Max and min values into which axis need to be scaled/zoomed
    double maxX = MyWinformChart.ChartAreas[0].AxisX.Maximum
                - deltaScrollTotal * maxXScale;
    double minX = MyWinformChart.ChartAreas[0].AxisX.Minimum
                + deltaScrollTotal * minXScale;
    double maxY = MyWinformChart.ChartAreas[0].AxisY.Maximum
                - deltaScrollTotal * minYScale;
    double minY = MyWinformChart.ChartAreas[0].AxisY.Minimum
                + deltaScrollTotal * maxYScale;

    MyWinformChart.ChartAreas[0].AxisX.ScaleView.Zoom(minX, maxX);
    MyWinformChart.ChartAreas[0].AxisY.ScaleView.Zoom(minY, maxY);
}

事件处理程序设置如下：

MyWinformChart.MouseWheel += new System.Windows.Forms.MouseEventHandler(chart_MouseWheel);

我的问题是当我点击WPF应用程序中的任何其他按钮时，我无法通过滚动来缩放。我不太确定这可能是什么。

在Windows 7计算机上使用VS2012 Express

滚动缩放问题，Winforms Chart

0 个答案: