/// <summary>
/// Determin coloring of GantItem, based on dates and override when needed.
/// </summary>
/// <param name="item">The GantItem to check.</param>
private void DeterminGantItemColor(GantItem item, int itemIndex)
{
// Items with invalid Date(s), need to be re-colored
if (item.HasInvalidDates)
{
if (string.IsNullOrEmpty(item.Color))
{
item.Color = NO_VALID_DATE_COLOR;
}
item.Description = item.Description;
}
else if (!item.HasValidStartDate)
{
if (string.IsNullOrEmpty(item.Color))
{
item.Color = NO_VALID_START_DATE_COLOR;
}
item.Description = item.Description;
}
else if (!item.HasValidEndDate)
{
if (string.IsNullOrEmpty(item.Color))
{
item.Color = NO_VALID_END_DATE_COLOR;
}
item.Description = item.Description;
}
// If dynamic coloring is requested, overwrite inline values
else if (useDynamicColors)
{
if (string.IsNullOrEmpty(item.Color))
{
int colorIndex = itemIndex % dynamicColorList.Length;
item.Color = dynamicColorList[colorIndex];
}
}
// All items need a color, determine default color
else if (string.IsNullOrEmpty(item.Color))
{
// If a static color is set for chart, use that color
if (!string.IsNullOrEmpty(this.staticColor))
{
item.Color = this.staticColor;
}
// Else, use a default color
else
{
item.Color = STATIC_BASE_COLOR;
}
}
}
protected override void Render(HtmlTextWriter writer)
{
Page.ClientScript.RegisterStartupScript(typeof(Page), "GantManager", "var GantManager = {};", true);
string myGant = "GantManager['" + this.ClientID + "'] = new Array();";
Page.ClientScript.RegisterStartupScript(typeof(Page), "Gant" + this.ClientID, myGant, true);
// Get count of Gant Items.
int itemCount = this.gantItems.Count;
// If there are no gant items, just render empty control.
if (itemCount == 0)
{
Label noItems = new Label();
noItems.CssClass = "GantChartNoItems";
noItems.Text = "No Items";
base.RenderBeginTag(writer);
noItems.RenderControl(writer);
base.RenderEndTag(writer);
}
else
{
// Keep track of items with no start or end dates
// (i.e., DateTime.Min && DateTime.Min Dates)
List <GantItem> gantItemsNoStart = new List <GantItem>();
List <GantItem> gantItemsNoEnd = new List <GantItem>();
// Index of visible items, not all items in chart will be visible
// so no need to offset valid items which are next to invalid items
int visibleGantIndex = 0;
for (int i = 0; i < itemCount; i++)
{
GantItem item = this.gantItems[i];
item.ShowDescription = showGantItemDescriptions;
// Set opacities
item.RemainingOpacity = remainingItemOpacity;
item.CompletedOpacity = completedItemOpacity;
// Set mouse events, if not defined in individual items
if (!string.IsNullOrEmpty(this.onItemMouseClick) && string.IsNullOrEmpty(item.OnMouseClick))
{
item.OnMouseClick = this.onItemMouseClick;
}
if (!string.IsNullOrEmpty(this.onItemMouseOver) && string.IsNullOrEmpty(item.OnMouseOver))
{
item.OnMouseOver = this.onItemMouseOver;
}
if (!string.IsNullOrEmpty(this.onItemMouseOut) && string.IsNullOrEmpty(item.OnMouseOut))
{
item.OnMouseOut = this.onItemMouseOut;
}
// DETERMINE GLOBAL DATES
// Determine earliest start date
if (item.HasValidStartDate && (startDate == DateTime.MinValue || item.StartDate < startDate))
{
startDate = new DateTime(item.StartDate.Ticks);
}
else
{
if (item.HasValidEndDate && startDate > item.EndDate)
{
startDate = new DateTime(item.EndDate.Ticks);
}
gantItemsNoStart.Add(item);
}
// Determine latest end date
if (item.HasValidEndDate && (endDate == DateTime.MaxValue || item.EndDate > endDate))
{
endDate = new DateTime(item.EndDate.Ticks);
}
else
{
if (item.HasValidStartDate && endDate < item.StartDate)
{
endDate = new DateTime(item.StartDate.Ticks);
}
gantItemsNoEnd.Add(item);
}
// Determine if item will be visible, i.e. it has valid end or start date (or both)
if (!item.HasInvalidDates)
{
// Distance from the top of container is determine by factor of ITEM_TOP_OFFSET
item.Top = (visibleGantIndex * ITEM_TOP_OFFSET) + 25;
// Determine coloring of item
DeterminGantItemColor(item, i);
visibleGantIndex++;
}
}
// Determin "real" start and end dates
// i.e. Min and Max dates should not be valid
if (startDate == DateTime.MinValue)
{
// If both dates are invalid
// span is the beginng of this to begining of next year
if (endDate == DateTime.MaxValue)
{
DateTime today = DateTime.Today;
DateTime firstDayOfYear = new DateTime(today.Year, 1, 1);
DateTime firstDayOfNextYear = new DateTime(today.Year + 1, 1, 1);
startDate = firstDayOfYear;
endDate = firstDayOfNextYear;
}
// Otherwirse, start date is a year before the end date
else
{
startDate = new DateTime(endDate.Year - 1, 1, 1);
}
}
else if (endDate == DateTime.MaxValue)
{
// Start date is valid at this point
endDate = new DateTime(startDate.Year, 1, 1);
}
/// NORMALIZE START AND END DATE
// Start and Ends always occur on 1st of month
int startMonth = startDate.Month;
int startYear = startDate.Year;
if (startMonth == 1)
{
startMonth = 12;
startYear = startYear - 1;
}
// Each marker should represent a differnt date/day, so the range of the chart
// should cover at least the count of markers
int currentChartDaySpan = (int)(endDate - startDate).TotalDays;
if (currentChartDaySpan < markerCount)
{
long neededChartDaySpan = (new TimeSpan(markerCount, 0, 0, 0, 0) - (endDate - startDate)).Ticks;
long daysBefore = neededChartDaySpan / (long)2.0;
long daysAfter = neededChartDaySpan / (long)2.0;
// Subtract and Add days to current start and end dates
startDate = startDate.Subtract(new TimeSpan(daysBefore));
endDate = endDate.Add(new TimeSpan(daysAfter));
}
else
{
long ticksPerMarker = (endDate - startDate).Ticks / (long)markerCount;
startDate = startDate.Subtract(new TimeSpan(ticksPerMarker));
endDate = endDate.Add(new TimeSpan(ticksPerMarker));
}
// A double representing the ticks from the start to the end of chart
double chartDateSpan = (double)(endDate - startDate).Ticks;
double increment = chartDateSpan / (double)markerCount;
// Loop tghrough all items and deteremine widths based on
// date range in chart
for (int i = 0; i < itemCount; i++)
{
GantItem item = this.gantItems[i] as GantItem;
// Only concernced with calculations with items that have valid dates
if (item.HasValidStartDate || item.HasValidEndDate)
{
if (item.HasValidDates)
{
double itemDateSpan = (double)(item.EndDate - item.StartDate).Ticks;
double itemDateFromStart = (double)(item.StartDate - startDate).Ticks;
int itemDateSpanPercentage = (int)(itemDateSpan / chartDateSpan * 100.0);
int itemDateSpanFromStart = (int)(itemDateFromStart / chartDateSpan * 100.0);
// Items with valid dates need at least 1% width to be represented
item.Style["width"] = Math.Max(1, itemDateSpanPercentage) + "%";
item.Left = itemDateSpanFromStart;
}
// Invalid items do not need widths set explicitly, will be handled by control
else
{
if (item.HasValidStartDate)
{
double itemDateFromStart = (double)(item.StartDate - startDate).Ticks;
int itemDateFromStartPercentage = (int)(itemDateFromStart / chartDateSpan * 100.0);
item.Left = itemDateFromStartPercentage;
}
else if (item.HasValidEndDate)
{
double itemDateFromEnd = (double)(endDate - item.EndDate).Ticks;
int itemDateFromEndPercentage = 100 - (int)(itemDateFromEnd / chartDateSpan * 100.0);
item.Left = itemDateFromEndPercentage;
}
}
}
}
// RENDERING
// Content which is not part of GantChart (i.e., legend, headers, etc...)
// should be rendered/writen directly to the output
// instead of being Controls in the GantChart Control collection
base.RenderBeginTag(writer);
base.RenderContents(writer);
// Render Title
RenderGantTitle(writer);
// Render Header
RenderGantHeader(increment, writer);
// Render Chart Background (w/ lines)
RenderGantBackground(writer);
// Render Legend
RenderGantLegend(writer);
base.RenderEndTag(writer);
}
}