C / C++ / MFC

19-Oct-07 0:31

i want to lern to draw a dynamic curve,but do not know how to do;
is there any good Activecontrol or methode,

my idea is, continuesly get data from a database or by some way else, then draw them on a picture, the curve should be dynamic.

thanks a lot

wuhuaiji

jhwurmbach19-Oct-07 0:45

jhwurmbach

19-Oct-07 0:45

What is your problem?
In OnDraw(), you draw the curve (MoveTo(), LineTo()) into the client rect. Whenever you get new data and fell the need to redraw, you Invalidate().

Let's think the unthinkable, let's do the undoable, let's prepare to grapple with the ineffable itself, and see if we may not eff it after all.
Douglas Adams, "Dirk Gently's Holistic Detective Agency"

nibabug19-Oct-07 0:51

19-Oct-07 0:51

hello
thanks for your answer
my problem is, how to make the curve move smoothly? it move from right to left with time going

wuhuaiji

jhwurmbach19-Oct-07 0:56

jhwurmbach

19-Oct-07 0:56

Do you want algorithms to interpolate and smooth the curve-data?
Or do you want to reduce flicker on the screen?

Either case, there are articles here on codeproject and on the net.
E.G. here[^].

chandu00419-Oct-07 0:48

19-Oct-07 0:48

have you googled to for "Active X Control to draw a curve"
there are somany articles and active X controls related to that topic.
or if you want to develop one active X control, then i can guide you.

Hamid_RT19-Oct-07 0:57

19-Oct-07 0:57

But why he must uses of Activexs control?

chandu00419-Oct-07 1:06

19-Oct-07 1:06

good question,
but as he said, he want to draw it on a picture.
so i thought, he would have to develop an AX to fulfil his task.
iam not sure, weather any existing control, has a mixture of both image and a graph on it.

Cedric Moonen19-Oct-07 1:11

Cedric Moonen

19-Oct-07 1:11

Why are you so obsessed with ActiveX controls OMG | :OMG:

. Why not simply use a custom control ?
Do you know why ActiveX are used ? Do you know that the purpose of ActiveX is to have a control that can be used in different languages. If you just developping a C++ app, why bothering with an ActiveX when you can simply use a custom control.

Cédric Moonen
Software developer

Charting control [v1.2]

chandu00419-Oct-07 1:22

19-Oct-07 1:22

yes you are right.
But i feel comfortable with AX because most of the times I use it in other languages also. Thats why i'm used to that.
Thank You.

Cedric Moonen19-Oct-07 1:24

Cedric Moonen

19-Oct-07 1:24

Well, but for somebody that only wants to use a control in its C++ application, this is a bad advice to tell him to develop its own ActiveX control. Why do you want to make things even more complex to him ? Developping an ActiveX control is more complicated than developping a simple custom control.

Cédric Moonen
Software developer

Charting control [v1.2]

chandu00419-Oct-07 1:36

19-Oct-07 1:36

yes and thanks,
i agree to your point.

nibabug19-Oct-07 0:59

19-Oct-07 0:59

thanks
i have googled, and now i know how to draw a static curve
but i want to draw a dynamic curve, which can move smoothly with time going

wuhuaiji

chandu00419-Oct-07 1:10

19-Oct-07 1:10

what is the difference you are referring to as static and dynamic curves.
you mean, you want to see the curve increasing from time to time, at run time?
if it is so, put your plotting code in a thread.
but i can suggest ful fledgedly, only, if u can provide a sample of code here, how you made it static.
gud luck.

Hamid_RT19-Oct-07 0:56

19-Oct-07 0:56

See An MFC Curve Control[^] and GDI+ Line/Curve Drawing and Hit Test[^].

Nishad S19-Oct-07 1:21

Nishad S

19-Oct-07 1:21

Why you cant draw a curve with existing APIs? What kind of data and curve are you intended to use?

- NS -

nibabug19-Oct-07 1:31

19-Oct-07 1:31

thanks a lot
first, i am a newbie, Poke tongue | ;-P

then, i just want draw a curve, which can move
now i have got many friends' help, thanks for all of your answer
and i think maybe i have found the solution
indeed, the question is a little problem, the big problem is that i am fresh in VC

wuhuaiji

Own created menues and ID

Cedric Moonen19-Oct-07 1:22

Cedric Moonen

19-Oct-07 1:22

You have two options:

1) Use an existing control, there are plenty existing on this website. I also developped one control that can do that (see the link in my sig). I think it is the easiest solution and the one that will save you a lot of troubles.

2) Create your own control. You seem to have some problems with the fact that the line should move. Well, there is no miracle: if you want to do such a thing, you have to make it move yourself (redraw the line completely).
I warn you that this is far from being the easiest solution. If you are completely new to this, I suggest you take the first option. But if you have some time and want to learn how it works, then it can be interesting to take that path. But then, start by reading some tutorials about how to create custom controls before starting to create your own.

Cédric Moonen
Software developer

Charting control [v1.2]

baerten19-Oct-07 0:20

baerten

19-Oct-07 0:20

Hi everybody,

i create my self a menu-object, so i can display the menu-items dynamically :

CMenu *Home = new CMenu();
Hom->AppendMenu(MF_STRING,ID_MYMENU_GO,"Go");
Home->TrackPopUpMenu(TPM_LEFTALIGN|TPM_RIGHTBUTTON,point.x,point.y,Parent);

The ID_MYMENU_GO isn't known and the menu item is disabled.
If i create a new String-Ressource with the ID of ID_MYMENU_GO and set a String of "-"
the Menu-Element is displayed correctly ...

Is it also possible to set the Menu-Item ID to the project/mainform/.. so that
the application knows the ID ?

For example adding the String via programmation into the known ID's ...

Big thanks for help Smile | :)

Re: Own created menues and ID

Hamid_RT19-Oct-07 1:06

19-Oct-07 1:06

See Owner drawn menu with bitmaps, icons, and colors
[^] does helpful and other example An examination of menus from a beginner's point of view
[^] does any help.

Progress bar example

Chandrasekharan P18-Oct-07 23:56

Chandrasekharan P

18-Oct-07 23:56

just wanted to know if there is any readymade application where in progress bar is used. want some application where the progress bar should should tell me the progress while i am copying or playing a song.

Re: Progress bar example

chandu00419-Oct-07 0:16

19-Oct-07 0:16

can u explain more?

Re: Progress bar example

Hamid_RT19-Oct-07 1:10