C / C++ / MFC

Re: problem with vob files

31-Jan-06 1:37

KORCARI wrote:
z=f(x,y)

To draw it: http://www.codeproject.com/miscctrl/pgllib.asp[^]

To compute it: use the standard math library.

~RaGE();

Re: Show me please..

Bob Stanneveld31-Jan-06 2:13

Bob Stanneveld

31-Jan-06 2:13

Hello,

Please define more clearly what you mean. To me it is not clear if you want to create your own library or you want to use some other...

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Re: Show me please..

Storm-blade31-Jan-06 5:53

Storm-blade

31-Jan-06 5:53

Is this http://www.codeproject.com/cpp/FastMathParser.asp[^] what you are looking for?

problem with vob files

sanjukta12331-Jan-06 0:51

sanjukta123

31-Jan-06 0:51

I have used Windows Media Player 10 in my vc++ application...i can play mp3 and avi files but not vob files...when i rename the vob files to mpg, the application plays them...but it does not do the same with vob files...please help...
thanks

Sanjukta

-- modified at 6:51 Tuesday 31st January, 2006

Rage31-Jan-06 1:49

31-Jan-06 1:49

How are you loading the files ? Please post a small code snippet.

~RaGE();

Operator overloading

tbrake31-Jan-06 0:49

tbrake

31-Jan-06 0:49

Hallo

I have written some class

<br />
#if !defined(_COMPLEX_H_)<br />
#define _COMPLEX_H_<br />
<br />
#include <stdio.h><br />
#include <iostream.h><br />
<br />
class Complex  <br />
{<br />
public:<br />
	Complex();<br />
	Complex(const Complex&);<br />
	Complex(double a, double b) : re(a), im(b) {}<br />
<br />
	virtual ~Complex();<br />
<br />
	// Complex += Complex<br />
	const Complex& operator+= (const Complex&);<br />
	// Cpmplex += Zahl<br />
	const Complex& operator+= (const double);<br />
	// Zahl += Complex<br />
	friend Complex operator+= (double&, Complex&);<br />
<br />
	// Comlex + Complex<br />
	Complex operator+ (const Complex&) const;<br />
	// Complex + Zahl<br />
	Complex operator+ (const double) const;<br />
	// Zahl + Complex<br />
	friend Complex operator+ (double, const Complex&);<br />
<br />
	// Complex -= Complex<br />
	const Complex& operator-= (const Complex&);<br />
	// Complex -= Zahl<br />
	const Complex& operator-= (const double);<br />
	// Zahl -= Complex<br />
	friend Complex operator-= (double, Complex&);<br />
<br />
	// Complex - Complex<br />
	Complex operator- (const Complex&) const;<br />
<br />
	// Complex - Zahl<br />
	Complex operator- (const double) const;<br />
<br />
	// Zahl - Complex<br />
	friend Complex operator- (double, const Complex&);<br />
<br />
	// Konjunktion<br />
	Complex operator! (void);<br />
<br />
	// Ausgabe einer Complexenzahl<br />
	friend ostream& operator<< (ostream&,const Complex&);<br />
<br />
private:<br />
	double re;<br />
	double im;<br />
};<br />
<br />
#endif<br />

How to change this operator to global calling and then referencing in the class complex ???

THX T

Rage31-Jan-06 1:50

31-Jan-06 1:50

tbrake wrote:
global calling

What do you mean ? What do you want to achieve ?

~RaGE();

Bob Stanneveld31-Jan-06 2:17

Bob Stanneveld

31-Jan-06 2:17

Hello,

Does the following help:

Complex operator!(const Complex& This);

This operator is not a member function, but a global one.

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tbrake31-Jan-06 2:29

tbrake

31-Jan-06 2:29

Hi
i'd like to achive that there are not that many functions so changes might be easier to make

I know that it is possible to get the same behavior by using 4 global funktions and torefere by using friend. But i dont know hoe to manage

T

David Crow31-Jan-06 3:47

David Crow

31-Jan-06 3:47

tbrake wrote:
I know that it is possible to get the same behavior by using 4 global funktions...

In addition to, or in lieu of, the class methods?

tbrake wrote:
...and torefere by using friend.

Doesn't your class already have friend functions?

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tbrake31-Jan-06 5:53

tbrake

31-Jan-06 5:53

Year your right !?!

But whenever i try something like

<br />
Complex operator! (double&, Complex&);<br />
class Complex<br />
{<br />
...<br />
};<br />

I receive some errors!

And second isn't ist possible to combine all "+" or "+=" ... functions so that there is only one to modify and not like the class i posted changeing always 3 methods ??

T

Detect and Fill part of an image

David Crow31-Jan-06 6:09

David Crow

31-Jan-06 6:09

tbrake wrote:
I receive some errors!

What errors?

class Complex
{
...
};
 
Complex operator!( double&, Complex& );

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beko31-Jan-06 0:30

beko

31-Jan-06 0:30

Hello,

I want to implement something similar to map colouring (Not the famous problem but actually filling). Let us say, i have a picture of a continent, and i want to select a country and fill it with a colour and also in a list view, i want to highlight that country with some additional info.

At first, i thought i could get points (borders of a country), and use triangulation or polygon filling and define bounding rectangles or polygons (simple way, not using any tree implementation), but this approach needs lots of data generated by me. (using OpenGL)

my question is, is it feasible to implement this with a picture, detecting boundaries (i saw threads about edge detection) automatically for each country name and store them for hit testing and use filling algorithms (flood vs.)? (I am a real beginner on Image Processing, Bitmap Handling, GDI etc. Smile | :)

)

How would you solve this?

Thank you,

Bekir Turkmen.

C^hris L^osinger31-Jan-06 2:05

C^hris L^osinger

31-Jan-06 2:05

beko wrote:
us say, i have a picture of a continent, and i want to select a country and fill it with a colour and also in a list view, i want to highlight that country with some additional info.

do you already know the boundaries of the countries ? if so, how are the boundaries stored ?

Cleek | Image Toolkits | Thumbnail maker

beko31-Jan-06 2:39

beko

31-Jan-06 2:39

i dont know the boundaries initially.

However, i can find them manually and store them as point vectors for using input to Delaunay Triangulation (i have implemented one or two parts this way, without using any info from any picture) and display it with OpenGL.

I do not need any information about boundaries actually other than hit testing, so i thought i could retrieve those boundaries(using edge detection algorithms) from the picture directly and display the picture as the view.(In data preparation stage, for example, when i click Canada, i will generate the boundary data and define it as Canada and write to a file (perhaps with some processing to reduce number of points) to read it later for hit testing.)

Note that in the picture, boundaries are clearly given.

Thanks.

Bekir.

A.A.31-Jan-06 7:47

A.A.

31-Jan-06 7:47

Way too little information to make a decent recommendation. If the area under the different regions have similiar features, look into doing some kind of connected component analysis.

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normanS31-Jan-06 20:16

normanS

31-Jan-06 20:16

I suggest brute-force and pig-ignorance. It's not pretty, but it always works for me!

Assuming the map is static (because the countries / areas don't change) you could colour a bitmap image of the map offline, using some graphics package, so that all countries use different colours. If you use 24-bit colours, the difference could be in a single LSbit, which would un-noticeable.

Then display the map as a bitmap image. When you click on a point, get the colour under the cursor, and match that to the country, in order to get country-specific information. To change the colour you could (using brute force) loop through all the pixels in a copy of your original bitmap, replacing all pixels of the matching colour with a new colour, then display the updated bitmap.

beko1-Feb-06 1:01

beko

1-Feb-06 1:01

Thanks for the suggestion,

I think that is quite practical, i will try to implement the way you suggested.

Thanks to all replies.

Bekir.

want to kill previous instance of the same MFC app

normanS1-Feb-06 19:16

normanS

1-Feb-06 19:16

Great!

It's a lot easier to use the brute force approach and get the computer to work hard, rather than to have to learn how to implement complicated edge-detection algorithms.

Of course, if the map changes frequently, my suggestion would not be useful.

Aryan S31-Jan-06 0:12

Aryan S

31-Jan-06 0:12

I want my MFC application will check whether another instance of it is already running or not. And if another inst. is running then it will kill the prev process. I want to know how get the information whether another instance is running and not? and how to get the process id of that one?

Re: want to kill previous instance of the same MFC app

Owner drawn31-Jan-06 1:05

Owner drawn

31-Jan-06 1:05

http://www.codeproject.com/cpp/avoidmultinstance.asp[^]

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Re: want to kill previous instance of the same MFC app

Rage31-Jan-06 1:52