Time to draw 2 usercontrols on a form is depend on each other.

[BillWoodruff]

Hi, You still haven't answered the question about why you are using Timers to control painting/drawing, and what it is your painting/drawing. Please be specific.

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

[LeHuuTien]

I want to redraw usercontrol 1 and usercontrol 2 follow cycle(usercontrol 1 and usercontrol 2 always redraw follow Timer.Interval of each control), so I use Timer.Elapsed event to do that. It draws line, text, ... Sorry for bad English.

[Pete OHanlon]

Perhaps if you could show us a cut down version of the paint code for both controls.

[LeHuuTien]

usercontrol 1 will invoke 2 functions, one of it:

public void DrawControl(Graphics g)
{
int X = 599;
int Y = 10;
int Width = 225;
using (GraphicsPath path = GraphicsHelper.Create(X, Y, 224, 119, 5))
{
using (Pen frameWithBlackBgrd = new Pen(CWColors.FrameWithBlackBgrd))
{
g.DrawPath(frameWithBlackBgrd, path);
}
}

       if (GuiResInfoMng.Instance.Lang != null && GuiResInfoMng.Instance.Param != null)
       {
           using (SolidBrush fixedTextWithBlackBgrd = new SolidBrush(CWColors.FixedTextWithBlackBgrd))
           {
               g.DrawString(GuiResInfoMng.Instance.Lang.GetStr(LangId.IDS\_COM\_TOTALCNT),
                   FontFactory.Instance.GetFont(LangId.FNT\_M2), fixedTextWithBlackBgrd, X, Y);
               g.DrawString(GuiResInfoMng.Instance.Lang.GetStr(LangId.IDS\_COM\_PASS), FontFactory.Instance.GetFont(LangId.FNT\_M2),
                   fixedTextWithBlackBgrd, X, Y + 23);
               g.DrawString(GuiResInfoMng.Instance.Lang.GetStr(LangId.IDS\_COM\_NG), FontFactory.Instance.GetFont(LangId.FNT\_M2),
                   fixedTextWithBlackBgrd, X - 1, Y + 46);
           }
       }

       using (SolidBrush variableText = new SolidBrush(CWColors.VariableText))
       {
           g.DrawString(ParamHelper.GetParamStr(ParamId.TOTALCOUNT).Trim(), FontFactory.Instance.GetFont(LangId.FNT\_M2), variableText, X + Width - 60, Y);
           g.DrawString(ParamHelper.GetParamStr(ParamId.PASSCOUNT).Trim(), FontFactory.Instance.GetFont(LangId.FNT\_M2), variableText, X + Width - 60, Y + 23);
           g.DrawString(ParamHelper.GetParamStr(ParamId.NGCOUNT).Trim(), FontFactory.Instance.GetFont(LangId.FNT\_M2), variableText, X + Width - 60, Y + 46);
       }
   }

[Pete OHanlon]

That's the paint routine for one control, not two.

[LeHuuTien]

usercontrol 2 will invoke draw function:

public void DrawGraph(Graphics g)
{
g.SmoothingMode = SmoothingMode.HighSpeed;
//Draw background
_frameXBar.DrawBackground(g, XbarPos);
_frameNumber.DrawBackground(g, NumberPos);
_frameRS.DrawBackground(g, RsPos);

       //Draw XBar
       DrawXBarBase(g);
       DrawXbarGraph(g);

       ////Draw RS
       DrawRSBase(g);
       DrawRSGraph(g);

       ////Draw Number
       DrawNumber(g);
   }

DrawGraph function will call some function: Ex:

private void DrawRSGraph(Graphics g)
{
if (IsAllLine)
{
if (IsR)
{
if (IsFullLine)
{
DrawPolyline(_dataAllLineRFullNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
else
{
DrawPolyline(_dataAllLineRPassNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
}
else
{
if (IsFullLine)
{
DrawPolyline(_dataAllLineSFullNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
else
{
DrawPolyline(_dataAllLineSPassNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
}
}
else
{
if (IsR)
{
if (IsFullLine)
{
DrawPolyline(_dataForLineRFullNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
else
{
DrawPolyline(_dataForLineRPassNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
}
else
{
if (IsFullLine)
{
DrawPolyline(_dataForLineSFullNumber, g, _frameRS.Width, _frameRS.Height, CalculateHeightRS, RsPos);
}
else
{
DrawPolyline(_dataForLineSPassNumber, g, _

[BillWoodruff]

Hi, I'd like to suggest you now go back to your original question here and edit it so it includes the information/code you've shared. cheers, Bill

«I want to stay as close to the edge as I can without going over. Out on the edge you see all kinds of things you can't see from the center» Kurt Vonnegut.

[Lost User]

How many "cores" does your CPU have? Getting the most out of multi-threading (usually) requires multiple cores. You want control 1 to be "stable" ... What about control 2? If control 1 can be stable at the expense of control 2, then you could implement a "priority" system where control 1 is allowed to preempt control 2 (for drawing), but control 2 is not allowed to preempt control 1. There are various ways of blocking and testing for locks to accomplish this. Be aware that "drawing" has always been a fairly slow operation relative to compute time (that's why it is not wise to update a "progress bar" too frequently when it comes to critical operations). Also, 100ms is (usually) the limit at which a user can detect "lag" in a UI; you might consider raising the interval for control 1 to 200ms and checking the results. And, since the interval of control 2 is a multiple of control 1, you might consider using a single timer, and "dispatching" control 2 once for every n times control 1 is dispatched; i.e. dispatch either control 1 or 2, but not so that both are running at the same time (when redrawing).

[LeHuuTien]

Thank for your reply. My cpu has 2 core. The first I want control 1 to be stable, control 2 still not care. I measure time to draw control 1, AVG value = 15ms-> 20 ms, usually it ~ 10 ms, however when control 2 has been drawing, time to draw control 1 increase up to ~ 200ms. When control 2 complete it decrease down to ~ 10ms.(I want to both control are running at the same time, the drawing of controls is independence)

[Lost User]

Your measurements seem to indicate that the controls cannot run at the same time if you expect control 1 to always draw at under 100ms without considering what control 2 is doing (or vice versa).

[LeHuuTien]

I can confirm that both control are draw at the same time.

[Lost User]

"Should not" then.