public void UpdateTime(string group, string second)
{
int currenttime = Convert.ToInt32(second);
List <SSImage> images = CourseApi.GetScreenshotData(currenttime);
List <ScreenImage> list = new List <ScreenImage>();
// convert image from byte[] to base64 string.
foreach (SSImage item in images)
{
if (item.Image == null)
{
continue;
}
list.Add(new ScreenImage {
Row = item.Row, Col = item.Col, ImageStream = Convert.ToBase64String(item.Image)
});
}
JavaScriptSerializer jss = new JavaScriptSerializer();
Clients.Group(group).broadcastDrawScreenshot(jss.Serialize(list));
WBData wbData = CourseApi.GetWhiteboardData(currenttime);
JavaScriptSerializer jss2 = new JavaScriptSerializer();
Clients.Group(group).broadcastDrawWhiteboard(jss2.Serialize(wbData));
}
void TimerWB_Elapsed(object sender, ElapsedEventArgs e)
{
InvokeOnMainThread(delegate
{
int second = Convert.ToInt32(sliderTimeline.Value);
WBData wbData = CourseApi.GetWhiteboardData(second);
canvasWB.WBData = wbData;
canvasWB.CurrentSecond = second;
canvasWB.SetNeedsDisplay();
});
}
public static WBData GetWhiteboardData(int second)
{
// get lines
List <WBLine> lines = GetWBImageData(second);
// get events
List <WBEvent> events = GetWBSequenceData(second);
// combine them to whiteboard data
WBData wb = new WBData(second, lines, events);
return(wb);
}
private void DrawWhiteBoard(string group, int currenttime, bool forcerefresh, COLDataSource ds)
{
bool drawLines = true;
int currentMin = Helper.GetMinute(currenttime * 1000);
if (previousMin == currentMin && forcerefresh == false)
{
// Whiteboard data is based on minute, not second.
// Only draw when in different minute, or user changed the slider manually.
drawLines = false;
}
else
{
forcerefresh = false;
previousMin = currentMin;
currentEventTs = -1;
}
WBData wbdata = ds.GetWhiteBoardData(DataType.WB_1, currenttime);
if (wbdata == null)
{
return;
}
if (drawLines && wbdata.WBLines != null && wbdata.WBLines.Count > 0)
{
//JavaScriptSerializer jss = new JavaScriptSerializer();
//List<BoardLine> list = new List<BoardLine>();
foreach (WBLine line in wbdata.WBLines)
{
WBLineStyle linestyle = Helper.GetLineStyle(line.UColor);
Clients.Group(group).broadcastDrawWBLine(linestyle.Color, linestyle.Width, line.X0, line.Y0, line.X1, line.Y1);
//list.Add(new BoardLine { Color = linestyle.Color, Width = linestyle.Width, X0 = line.X0, Y0 = line.Y0, X1 = line.X1, Y1 = line.Y1 });
}
Clients.Group(group).broadcastDrawWBLineFinished();
//Clients.All.broadcastDrawWBLine(jss.Serialize(list));
}
if (wbdata.WBEvents != null && wbdata.WBEvents.Count > 0)
{
Hashtable htgroup = GroupWBEventsBySecond(wbdata.WBEvents);
int endMilliseconds = currenttime * 1000 % 60000;
int ix;
//JavaScriptSerializer jss = new JavaScriptSerializer();
//List<BoardLine> list = new List<BoardLine>();
for (ix = currentEventTs; ix <= endMilliseconds; ix++)
{
List <WBEvent> wbevents = htgroup[(uint)ix] as List <WBEvent>;
if (wbevents == null)
{
continue;
}
foreach (WBEvent wbevent in wbevents)
{
if (wbevent.X >= 0)
{
if (lastPoint == null)
{
lastPoint = wbevent;
}
else
{
//currentLineStyle.Color.SetStroke();
//gctx.SetLineWidth(currentLineStyle.Width);
//gctx.MoveTo(lastPoint.X * xRate, lastPoint.Y * yRate);
//gctx.AddLineToPoint(wbevent.X * xRate, wbevent.Y * yRate);
//gctx.StrokePath();
Clients.Group(group).broadcastDrawWBEvent(currentLineStyle.Color, currentLineStyle.Width, lastPoint.X, lastPoint.Y, wbevent.X, wbevent.Y);
//list.Add(new BoardLine { Color = currentLineStyle.Color, Width = currentLineStyle.Width, X0 = lastPoint.X, Y0 = lastPoint.Y, X1 = wbevent.X, Y1 = wbevent.Y });
lastPoint = wbevent;
}
}
else
{
switch (wbevent.X)
{
case -100: //Pen Up
currentLineStyle.Color = -8;
lastPoint = null;
break;
case -200: //Clear event
//gctx.ClearRect(rect);
Clients.Group(group).broadcastClearReat();
lastPoint = null;
break;
default:
currentLineStyle = Helper.GetLineStyle(wbevent.X);
break;
}
lastPoint = null;
}
}
}
Clients.Group(group).broadcastDrawWBEventFinished();
// Clients.All.broadcastDrawWBEvent(jss.Serialize(list));
currentEventTs = ix;
}
}
