/// <summary>
/// 检查是否可以调整。确保可以调整。
/// </summary>
/// <param name="ScaleView"></param>
private static void CheckZoomable(AxisScaleView ScaleView)
{
if (!ScaleView.IsZoomed)
{
ScaleView.Zoom(ScaleView.ViewMinimum, ScaleView.ViewMaximum * 0.999999999);
}
}
private void TChart_MouseWheel(object sender, MouseEventArgs e)
{
if (this.Series.Count == 0 || this.Series[0].Points.Count < 3)
{
return;
}
AxisScaleView view1 = this.ChartAreas[0].AxisX.ScaleView;
double total = Math.Abs(e.Delta);
double interval = 1;
for (int i = 0; i < total; i += 120)
{
if (e.Delta > 0)
{
interval *= 0.8;
}
else
{
interval *= 1.2;
}
}
if (interval > 1 && (view1.ViewMaximum - view1.ViewMinimum) > (this.ChartAreas[0].AxisX.Maximum - this.ChartAreas[0].AxisX.Minimum) * 0.8)
{
view1.ZoomReset();
this.ChartAreas[0].CursorX.IsUserSelectionEnabled = true;
UpdateLine();
return;
}
this.ChartAreas[0].CursorX.IsUserSelectionEnabled = false;
if (this.ChartAreas[0].AxisX.CustomLabels.Count == 0)
{
return;
}
string v1 = this.ChartAreas[0].AxisX.CustomLabels[0].Text;
double value;
if (this.Series[0].XValueType == ChartValueType.Time)
{
var v2 = v1.Split(' ')[0].Split(':');
value = v2[0].ToInt() * 60 + v2[1].ToInt();
}
else
{
value = v1.ToDouble();
}
double min2 = value - (value - view1.ViewMinimum) * interval;
min2 = Math.Floor(min2);
double max2 = value + (view1.ViewMaximum - value) * interval;
max2 = Math.Ceiling(max2);
if (interval < 1 && max2 - min2 < minInterval * 3)
{
return;
}
view1.Zoom(min2, max2);
UpdateShow();
UpdateLine();
}
private void Zoom(AxisScaleView asv, double coeff)
{
double shift = coeff * (asv.ViewMaximum - asv.ViewMinimum);
asv.Zoom(asv.ViewMinimum + shift, asv.ViewMaximum - shift);
}