/// <summary>
/// 得到对象数据所占的百分比
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public Double GetItemPercent(PieChartItem item)
{
return(item.Value * 100 / TotalDataValue);
}
/// <summary>
/// 得到对象数据所占的比例
/// </summary>
/// <param name="item"></param>
/// <returns></returns>
public Double GetItemScale(PieChartItem item)
{
return(item.Value / TotalDataValue);
}
/// <summary>
/// Called to fire an ItemDoubleClicked event.
/// </summary>
/// <param name="item">The event arguments.</param>
private void FireItemDoubleClicked(PieChartItem item)
{
if (ItemDoubleClicked != null)
ItemDoubleClicked(this, new PieChartItemEventArgs(item));
}
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="oldItem">The item that is losing focus.</param>
/// <param name="newItem">The item that is gaining focus.</param>
public PieChartItemFocusEventArgs(PieChartItem oldItem, PieChartItem newItem)
{
this.oldItem = oldItem;
this.newItem = newItem;
}
/// <summary>
/// Constructs a new instance.
/// </summary>
/// <param name="item">The item involved with an event.</param>
public PieChartItemEventArgs(PieChartItem item)
{
this.item = item;
}
/// <summary>
/// Called to fire an ItemFocusChanging event.
/// </summary>
/// <param name="oldItem">The item that was previously focused.</param>
/// <param name="newItem">The item that is gaining focus.</param>
private void FireItemFocusChanging(PieChartItem oldItem, PieChartItem newItem)
{
if (ItemFocusChanging != null)
ItemFocusChanging(this, new PieChartItemFocusEventArgs(oldItem, newItem));
}
/// <summary>
/// Set the currently focused PieChartItem.
/// </summary>
/// <param name="item">The item that currently has mouse focus.</param>
private void SetFocusedItem(PieChartItem item)
{
if (item != this.FocusedItem)
{
FireItemFocusChanging(this.FocusedItem, item);
this.focusedItem = item;
FireItemFocusChanged();
MarkVisualChange(true);
}
// check to see if the item has a tool tip and if it should be displayed
if (this.FocusedItem != null && this.FocusedItem.ToolTipText != null && this.Style.ShowToolTips)
{
toolTip.SetToolTip(this, this.FocusedItem.ToolTipText);
}
else
{
toolTip.RemoveAll();
}
}
