c# - Smooth scroling in chart with datetime x axis -

i have simple graph plotted in chart. on x-axis values datetime values.

public partial class form1 : form {      list<double> valuelist = new list<double>();     list<datetime> timelist = new list<datetime>();      public form1()     {         initializecomponent();          // fill lists values         (int = 0; < 2000; i++)         {             double value = math.sin(i/20.0);             valuelist.add(value);             timelist.add(datetime.now.addminutes(i + 2));         }          // add values chart         (int = 0; < valuelist.count; i++)         {             this.chart1.series[0].points.addxy(timelist[i], valuelist[i]);         }          this.chart1.chartareas[0].axisx.labelstyle.format = "dd.mm-hh:mm";      }      private void form1_load(object sender, eventargs e)     {          chart1.series[0].xvaluetype = chartvaluetype.datetime;           chart1.chartareas[0].axisx.maximum = timelist.max().tooadate();         chart1.chartareas[0].axisx.minimum = timelist.min().tooadate();           chart1.chartareas[0].cursorx.autoscroll = true;         chart1.chartareas[0].cursory.autoscroll = true;          chart1.chartareas[0].cursorx.isuserselectionenabled = true;         chart1.chartareas[0].cursory.isuserselectionenabled = true;           chart1.chartareas[0].axisx.scaleview.zoomable = true;         chart1.chartareas[0].axisy.scaleview.zoomable = true;          datetime intervall = timelist.min().addhours(3);           chart1.chartareas[0].axisx.scaleview.zoom(chart1.chartareas[0].axisx.minimum, intervall.tooadate());           // disable zoom-reset button          chart1.chartareas[0].axisx.scrollbar.buttonstyle = scrollbarbuttonstyles.smallscroll;          // set scrollbar small change blocksize          chart1.chartareas[0].axisx.scaleview.smallscrollsize = intervall.tooadate();     }  } 

my problem cannot scrollbar move smoothly. when plot y-values , use double values axisx.maximum, axisx.minimum, axisx.scaleview.zoom , axisx.scaleview.smallscrollsize works charm. use datetime x-values can scroll in steps. know how surpass this? have feeling piece of code obstacle:

// set scrollbar small change blocksize (e.g. 100) chart1.chartareas[0].axisx.scaleview.smallscrollsize = intervall.tooadate(); 

edit:

the interval x-axis automatic, range set zoomlevel of chart1.chartareas[0].axisx.scaleview.zoom. here picture:

edit 2:

the values x-axis datetime-values simulating sampling of 1 value every minute:

timelist.add(datetime.now.addminutes(i + 2)); 

because lot of values did not set interval. code posted way, can copied , run right away try out.

you scrolling interval wrong.

it should not start of data step want go when scrolling.

looks want scroll 3 hours?

here do:

chart1.chartareas[0].axisx.scaleview.smallscrollsizetype = datetimeintervaltype.hours; chart1.chartareas[0].axisx.scaleview.smallscrollsize = 3; 

if wanted use datetime.tooadate double achieve same need start @ first day of datatime data type (0aka 'dawn of time' aka 1899-12-30) , add 3 hours:

 datetime interval = datetime.fromoadate(0).addhours(3);  chart1.chartareas[0].axisx.scaleview.smallscrollsizetype = datetimeintervaltype.number;  chart1.chartareas[0].axisx.scaleview.smallscrollsize = interval.tooadate(); 

to allow dragging lift smoothly may work better setting smallscrollsize:

chart1.chartareas[0].axisx.scaleview.smallscrollminsizetype  =datetimeintervaltype.minutes; chart1.chartareas[0].axisx.scaleview.smallscrollminsize = 60; 

use unit , numbers! work if don't set smallscrollminsize.