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This code may give you some pointers toward a possible solution:IliaStoilov wrote:I have a candle chart, which can be zoomed and scrolled only horizontally. The series contain 30 to 180 candles. I am trying to limit the max zoom level to 10 candles but I can't figure it out. I can disable the zoom once there are only 10 candles visible (using first visible and last visible), but I can't turn it back on. The next issue is that I can't limit the scrolling to not exceed the first value of the series.
Code: Select all
Candle candle1;
private void InitializeChart()
{
tChart1.Aspect.View3D = false;
candle1 = new Candle(tChart1.Chart);
candle1.FillSampleValues(100);
tChart1.Zoom.Direction = ZoomDirections.Horizontal;
tChart1.Zoomed += TChart1_Zoomed;
tChart1.Scroll += TChart1_Scroll;
}
private void TChart1_Scroll(object sender, EventArgs e)
{
double first = candle1.XValues.First;
if(tChart1.Axes.Bottom.Maximum < first)
{
tChart1.Axes.Bottom.Maximum = first;
}
}
private void TChart1_Zoomed(object sender, EventArgs e)
{
List<double> xvalues = candle1.XValues.Value.ToList();
double first = xvalues.First(x => x >= tChart1.Axes.Bottom.Minimum);
int firstIndex = xvalues.IndexOf(first);
double last = xvalues[firstIndex + 9];
tChart1.Axes.Bottom.Maximum = last;
}