internal void SetEndDate(DrawingContext context)
{
float visibleRight = context.Left + context.Width;
int leftIndex = GetIndexByPoint(context.Left);
int rightIndex = GetIndexByPoint(visibleRight);
TimeSpan axisInterval = new TimeSpan();
for (int cellIndex = leftIndex; cellIndex <= rightIndex; cellIndex++)
{
TimeCell cell = GetCell(cellIndex);
RectangleF rectangle = new RectangleF(cell.Left, context.CurrentTop, cell.Width, this.Height);
if (rectangle.Left >= context.Left && rectangle.Right <= visibleRight)
{
axisInterval += cell.Interval;
}
else if (rectangle.Left < context.Left && rectangle.Right <= visibleRight)
{
axisInterval += cell.GetTimeInterval(rectangle.Right - context.Left);
}
else if (rectangle.Left >= context.Left && rectangle.Right > visibleRight)
{
axisInterval += cell.GetTimeInterval(visibleRight - rectangle.Left);
}
}
context.EndDate = _viewStartDate + axisInterval;
}
private int GetIndexByPoint(float left)
{
int index = 0;
TimeCell cell = GetCell(index);
// Step 1. First approximation
index = Convert.ToInt32(left / cell.Width);
// Step 2. Calibration
bool next = false;
bool previous = false;
while (true)
{
if (next && previous)
{
throw new GanttControlException(string.Format(CultureInfo.CurrentUICulture, "CalibrateIndex deadlock. Index = '{0}', Point X = '{1}'", index, left));
}
cell = GetCell(index);
if ((cell.Left + cell.Width) < left)
{
index++;
next = true;
continue;
}
if (cell.Left > left)
{
index--;
previous = true;
continue;
}
break;
}
return(index);
}
public override void RenderElement(DrawingContext context)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
GanttStyle style = this.Style as GanttStyle;
this.Height = context.HeaderItemHeight;
float visibleRight = context.Left + context.Width;
int leftIndex = GetIndexByPoint(context.Left);
int rightIndex = GetIndexByPoint(visibleRight);
TimeSpan axisInterval = new TimeSpan();
for (int cellIndex = leftIndex; cellIndex <= rightIndex; cellIndex++)
{
TimeCell cell = GetCell(cellIndex);
RectangleF rectangle = new RectangleF(cell.Left, context.CurrentTop, cell.Width, this.Height);
if (rectangle.Left >= context.Left && rectangle.Right <= visibleRight)
{
axisInterval += cell.Interval;
}
else if (rectangle.Left < context.Left && rectangle.Right <= visibleRight)
{
axisInterval += cell.GetTimeInterval(rectangle.Right - context.Left);
}
else if (rectangle.Left >= context.Left && rectangle.Right > visibleRight)
{
axisInterval += cell.GetTimeInterval(visibleRight - rectangle.Left);
}
using (SolidBrush backgroundBrush = new SolidBrush(style.BackgroundColor))
{
context.Graphics.FillRectangle(backgroundBrush, rectangle);
}
StringBuilder text = new StringBuilder();
switch (_titleType)
{
case TitleType.Start:
text.Append(GetDateText(cell.StartDate, _format, context.Provider));
break;
case TitleType.StartEnd:
text.Append(GetDateText(cell.StartDate, _format, context.Provider));
text.Append(" - ");
text.Append(GetDateText(cell.StartDate.AddTicks(cell.Interval.Ticks - 1), _format, context.Provider));
break;
}
if (text.Length > 0)
{
if (_scale == ScaleLevel.Week)
{
string weekNumber = string.Format(CultureInfo.InvariantCulture, " (#{0})", Iso8601WeekNumber.GetWeekNumber(cell.StartDate));
text.Append(weekNumber);
}
using (SolidBrush textBrush = new SolidBrush(style.ForegroundColor))
{
// TODO: Load font style from style sheet.
Font font = new Font("Arial", 8, FontStyle.Regular);
StringFormat stringFormat = new StringFormat();
stringFormat.Alignment = StringAlignment.Center;
stringFormat.LineAlignment = StringAlignment.Center;
context.Graphics.DrawString(text.ToString(), font, textBrush, rectangle, stringFormat);
}
}
rectangle.Width--;
rectangle.Height--;
using (Pen borderPen = new Pen(style.BorderColor, style.BorderWidth))
{
context.Graphics.DrawLine(borderPen, rectangle.Left, rectangle.Top, rectangle.Left, rectangle.Bottom);
}
}
context.EndDate = _viewStartDate + axisInterval;
}