private List <Header> GetFullHeaderList()
{
List <Header> result = new List <Header>();
DateTime newFromTime = new DateTime(FromDate.Year, FromDate.Month, FromDate.Day);
string item = null;
TimeSpan interval = ToDate - FromDate;
if (interval.TotalDays < 1)
{
DateTime tmpTime = newFromTime;
newFromTime = tmpTime.AddHours(FromDate.Hour);
if (headerFromDate.Minute < 59 & headerFromDate.Minute > 29)
{
tmpTime = newFromTime;
newFromTime = tmpTime.AddMinutes(30);
}
else
{
tmpTime = newFromTime;
newFromTime = tmpTime.AddMinutes(0);
}
while (newFromTime <= ToDate)
{
item = newFromTime.Hour + ":";
if (newFromTime.Minute < 10)
{
item += "0" + newFromTime.Minute;
}
else
{
item += "" + newFromTime.Minute;
}
Header header = new Header();
header.HeaderText = item;
header.HeaderTextInsteadOfTime = "";
header.Time = new DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, newFromTime.Hour, newFromTime.Minute, 0);
result.Add(header);
newFromTime = newFromTime.AddMinutes(5);
// The minimum interval of time between the headers
}
}
else if (interval.TotalDays < 60)
{
while (newFromTime <= ToDate)
{
Header header = new Header();
header.HeaderText = "";
header.HeaderTextInsteadOfTime = "";
header.Time = new System.DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0);
result.Add(header);
newFromTime = newFromTime.AddDays(1);
// The minimum interval of time between the headers
}
}
else
{
while (newFromTime <= ToDate)
{
Header header = new Header();
header.HeaderText = "";
header.Time = new System.DateTime(newFromTime.Year, newFromTime.Month, newFromTime.Day, 0, 0, 0);
header.HeaderTextInsteadOfTime = newFromTime.ToString("MMM");
result.Add(header);
newFromTime = newFromTime.AddMonths(1);
// The minimum interval of time between the headers
}
}
return(result);
}
private void DrawHeader(Graphics gfx, List <Header> headerList)
{
if (headerList == null)
{
headerList = GetFullHeaderList();
}
if (headerList.Count == 0)
{
return;
}
dynamic availableWidth = Width - 10 - barStartLeft - barStartRight;
widthPerItem = availableWidth / headerList.Count;
if (widthPerItem < 40)
{
List <Header> newHeaderList = new List <Header>();
bool showNext = true;
// If there's not enough room for all headers remove 50%
foreach (Header header in headerList)
{
if (showNext == true)
{
newHeaderList.Add(header);
showNext = false;
}
else
{
showNext = true;
}
}
DrawHeader(gfx, newHeaderList);
return;
}
int index = 0;
Header lastHeader = null;
foreach (Header header in headerList)
{
int startPos = barStartLeft + (index * widthPerItem);
bool showDateHeader = false;
header.StartLocation = startPos;
// Checks whether to show the date or not
if (lastHeader == null)
{
showDateHeader = true;
}
else if (header.Time.Hour < lastHeader.Time.Hour)
{
showDateHeader = true;
}
else if (header.Time.Minute == lastHeader.Time.Minute)
{
showDateHeader = true;
}
// Show date
if (showDateHeader == true)
{
string str = "";
if (header.HeaderTextInsteadOfTime.Length > 0)
{
str = header.HeaderTextInsteadOfTime;
}
else
{
str = header.Time.ToString("d-MMM");
}
gfx.DrawString(str, dateTextFont, Brushes.Black, startPos, 0);
}
// Show time
gfx.DrawString(header.HeaderText, timeTextFont, Brushes.Black, startPos, headerTimeStartTop);
index += 1;
lastHeader = header;
}
shownHeaderList = headerList;
widthPerItem = (Width - 10 - barStartLeft - barStartRight) / shownHeaderList.Count;
}