MS Chart c#中的ZOOM Out功能

我有以下Winforms代码：

void chart1_MouseWheel(object sender, MouseEventArgs e)
        {
            double xMin = chart1.ChartAreas[0].AxisX.ScaleView.ViewMinimum;
            double xMax = chart1.ChartAreas[0].AxisX.ScaleView.ViewMaximum;
            if (e.Delta < 0)
            {   //chart1.ChartAreas[0].AxisX.ScaleView.ZoomReset();
                //chart1.ChartAreas[0].AxisY.ScaleView.ZoomReset();
            }

            if (e.Delta > 0)
            {
                double posXStart = chart1.ChartAreas[0].AxisX.PixelPositionToValue(e.Location.X) - (xMax - xMin)/2 ;
                double posXFinish = chart1.ChartAreas[0].AxisX.PixelPositionToValue(e.Location.X) + (xMax - xMin)/2;
                chart1.ChartAreas[0].AxisX.ScaleView.Zoom(posXStart, posXFinish);
            }
        }

放大功能有效,但是当e.Delta< 0,我需要基于上述代码的缩小功能.

解决方法:

尝试

chart1.ChartAreas[0].AxisX.ScaleView.ZoomReset(1);
chart1.ChartAreas[0].AxisY.ScaleView.ZoomReset(1);

如果在缩放时将saveState设置为true,则ZoomReset(1)将返回到上一个缩放状态.或者,如果将saveState设置为false,则ZoomReset(1)会一直缩小.这是我的代码,我通过单击鼠标进行操作,但是我敢肯定您可以通过滚轮使用它：

    private void chart1_SelectionRangeChanged(object sender, CursorEventArgs e)
    {
        double startX, endX, startY, endY;

        if (chart1.ChartAreas[0].CursorX.SelectionStart > chart1.ChartAreas[0].CursorX.SelectionEnd)
        {
            startX = chart1.ChartAreas[0].CursorX.SelectionEnd;
            endX = chart1.ChartAreas[0].CursorX.SelectionStart;
        }
        else
        {
            startX = chart1.ChartAreas[0].CursorX.SelectionStart;
            endX = chart1.ChartAreas[0].CursorX.SelectionEnd;
        }
        if (chart1.ChartAreas[0].CursorY.SelectionStart > chart1.ChartAreas[0].CursorY.SelectionEnd)
        {
            endY = chart1.ChartAreas[0].CursorY.SelectionStart;
            startY = chart1.ChartAreas[0].CursorY.SelectionEnd;
        }
        else
        {
            startY = chart1.ChartAreas[0].CursorY.SelectionStart;
            endY = chart1.ChartAreas[0].CursorY.SelectionEnd;
        }

        if (startX == endX && startY == endY)
        {
            return;
        }

        chart1.ChartAreas[0].AxisX.ScaleView.Zoom(startX, (endX - startX), DateTimeIntervalType.Auto, true);
        chart1.ChartAreas[0].AxisY.ScaleView.Zoom(startY, (endY - startY), DateTimeIntervalType.Auto, true);
    }

标签：zoom,mschart,c,winforms
来源： https://codeday.me/bug/20191122/2059801.html