private void m_wndClearTimer_Tick(object sender, EventArgs e)
{
// 查找需要清除的目标
DateTime now = DateTime.Now;
TimeSpan tenMinutes = new TimeSpan(0, 20, 0);
List <int> removeKeys = new List <int>();
foreach (AISTarget target in m_AISCollection.Values)
{
if ((now - target.UpdateTime) >= tenMinutes)
{
removeKeys.Add(target.MMSI);
}
}
// 开展清除工作
foreach (int mmsi in removeKeys)
{
AISTarget target = null;
if (m_AISCollection.TryGetValue(mmsi, out target) && (target != null))
{
m_AISCollection.Remove(mmsi);
m_wndAISList.Items.Remove(target.ListItem);
}
}
}
/// <summary>
/// 更新位置
/// </summary>
private void UpdatePosition(int mmsi, double latitude, double longitude, double speed, double course, double heading)
{
if (this.InvokeRequired)
{
Delegate method = new UpdatePositionHandler(UpdatePosition);
this.Invoke(method, new object[] { mmsi, latitude, longitude, speed, course, heading });
return;
}
AISTarget target = null;
if (m_AISCollection.TryGetValue(mmsi, out target))
{
// 更新现有数据项
target.Latitude = latitude;
target.Longitude = longitude;
target.Speed = speed;
target.Course = course;
target.Heading = heading;
}
else
{
// 新增新数据项
target = new AISTarget();
target.MMSI = mmsi;
target.Latitude = latitude;
target.Longitude = longitude;
target.Speed = speed;
target.Course = course;
target.Heading = heading;
// 添加到集合中
m_AISCollection.Add(mmsi, target);
target.ListItem = new System.Windows.Forms.ListViewItem(mmsi.ToString());
target.ListItem.SubItems.AddRange(new string[] { "***", "***", "***", "***", "***", "***", "***", "***" });
m_wndAISList.Items.Add(target.ListItem);
}
if (target != null)
{
target.UpdateTime = DateTime.Now;
// 更新显示
target.UpdateContent();
}
}
/// <summary>
/// 更新静态信息
/// </summary>
private void UpdateData(int mmsi, string name, string callSign, string destination)
{
if (this.InvokeRequired)
{
Delegate method = new UpdateDataHandler(UpdateData);
this.Invoke(method, new object[] { mmsi, name, callSign, destination });
return;
}
AISTarget target = null;
if (m_AISCollection.TryGetValue(mmsi, out target))
{
// 更新现有数据项
target.Name = name;
target.CallSign = callSign;
target.Destination = destination;
}
else
{
// 新增新数据项
target = new AISTarget();
target.MMSI = mmsi;
target.Name = name;
target.CallSign = callSign;
target.Destination = destination;
// 添加到集合中
m_AISCollection.Add(mmsi, target);
target.ListItem = new System.Windows.Forms.ListViewItem(mmsi.ToString());
target.ListItem.SubItems.AddRange(new string[] { "***", "***", "***", "***", "***", "***", "***", "***" });
m_wndAISList.Items.Add(target.ListItem);
}
if (target != null)
{
target.UpdateTime = DateTime.Now;
// 更新显示
target.UpdateContent();
}
}