Algorithms

Ed.Poore2-Sep-06 13:13

Ed.Poore

2-Sep-06 13:13

Did you take a look at the first result in the search I provided you? Looks informative from the summary.

As of how to accomplish this, have you ever tried Google?
Failing that try Badger | [badger,badger,badger,badger...]

Loay Al Lusi2-Sep-06 14:03

2-Sep-06 14:03

yeah I did ... I get this "The page you requested cannot be found"

Luay Al-wesi

Ed.Poore2-Sep-06 21:49

Ed.Poore

2-Sep-06 21:49

Sorry, b***dy Windows didn't copy the right shortcut again: http://www.google.co.uk/search?&q=wavelet+compression+%2Bvb6+example[^]

As of how to accomplish this, have you ever tried Google?
Failing that try Badger | [badger,badger,badger,badger...]

Loay Al Lusi3-Sep-06 1:53

3-Sep-06 1:53

I tried that .. no codes for Visual Basic ... I do have the C code for it ... but I need the Visual Basic code .. thanks anyway

Luay Al-wesi

Paul Conrad3-Sep-06 5:28

Paul Conrad

3-Sep-06 5:28

luay1985 wrote:
I do have the C code for it ... but I need the Visual Basic code

Then port it from C to VB. Shouldn't be that difficult Unsure | :~

That's no moon, it's a space station. - Obi-wan Kenobi

Ed.Poore3-Sep-06 6:06

Ed.Poore

3-Sep-06 6:06

Just what I was about to say.

As of how to accomplish this, have you ever tried Google?
Failing that try Badger | [badger,badger,badger,badger...]

Loay Al Lusi3-Sep-06 8:08

3-Sep-06 8:08

Actually it's in the Visual C++ code ... and I don't know that language ... and I'm not that deep into Visual basic

Luay Al-wesi

Paul Conrad3-Sep-06 15:35

Paul Conrad

3-Sep-06 15:35

luay1985 wrote:
... and I don't know that language ...

Doesn't hurt to learn it Smile | :)

luay1985 wrote:
it's in the Visual C++ code ... and I'm not that deep into Visual basic

Shouldn't be an issue. Just give it a try.

That's no moon, it's a space station. - Obi-wan Kenobi

Loay Al Lusi5-Sep-06 2:12

5-Sep-06 2:12

I tried .. it's too big .. and most of the functions I didn't even hear of ... beside I'm learning Visual basic now .. and the project should be done before january.
thanks anyway ... I found one in VB .. not sure it's what I'm looking for .. but I will see about that

Luay Al-wesi

My Latest Math Book Acquisition

Paul Conrad5-Sep-06 7:01

Paul Conrad

5-Sep-06 7:01

luay1985 wrote:
I found one in VB .. not sure it's what I'm looking for .. but I will see about that

Good luck. Hope it's what your looking for -D

That's no moon, it's a space station. - Obi-wan Kenobi

Bassam Abdul-Baki30-Aug-06 4:11

Re: My Latest Math Book Acquisition

30-Aug-06 4:11

Prime Numbers, by David Wells. An excellent read for amateur and advanced mathematicians.

"I know which side I want to win regardless of how many wrongs they have to commit to achieve it." - Stan Shannon

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Frank Kerrigan4-Sep-06 3:10

Frank Kerrigan

4-Sep-06 3:10

Are the page numbers in primes only, cos that would be cool.

Look where you want to go not where you don't want to crash.

Bikers Bible

Re: My Latest Math Book Acquisition

Bassam Abdul-Baki4-Sep-06 4:32

Re: My Latest Math Book Acquisition

4-Sep-06 4:32

That would have been cool, but it was done with the layman in mind.

"I know which side I want to win regardless of how many wrongs they have to commit to achieve it." - Stan Shannon

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nadiric13-Sep-06 6:06

nadiric

13-Sep-06 6:06

The Music of the Primes, by Marcus du Sautoy - also a good read on the subject - good history

Hidden Line Drawing Sample - needs improvement

spacecadet1030-Aug-06 2:18

spacecadet10

30-Aug-06 2:18

Hey,

I am currently converting an application that (i think) was originally written in C, it was then upgraded to C/C++ and compiled as a 32bit Dos application using Watcom/dos4gw and the metagraphics libraries.

For the printed reports the app created several Hidden Line images and stored them as PCX / HPG / and DXF files.

I have managed to get this routine running in VC++ (with suprisingly little modification).

The original DOS version was fairly slow (about 2-3 seconds per scene) but running it in VC++/Windows takes soooo long, upto a minute or more !??

A stand-alone VC++ Project can be downloaded from :
http://www.rayevansengineering.com/Surreal/HiddenLine.zip[^]

Can anyone help me optimise this to a reasonable speed or at least help me understand why it takes so long.

As far as i'm concerned you are free to use this source code as you wish, but bear in mind that i'm not the original author.

The file VIEW.DAT contains the model information and must be present for the code to work

cheers

Sloped objects - how to transform a set of points

Steve S29-Aug-06 21:44

Steve S

29-Aug-06 21:44

I'm roughly up to speed on how to perform things like reflection and rotation, and even simple shear.

However, I want to produce a perspective effect on a 2D shape. If we take the case of a rectangle, the left edge would appear nearer the viewer than the right edge. These edges should still be vertical. However, instead of the top and bottom being parallel, they should taper, moving closer together as the X value increases.

Is there a 'magic' transformation I can apply, or do I have to iteratively update the points from left to right?

For simple shapes (like the rectangle), this wouldn't be too onerous, but I am also looking at generating the same effect for text, where there would be a larger number of points, and the order of the points is not so easy to predict.

Steve S
Developer for hire

Re: Sloped objects - how to transform a set of points

El Corazon30-Aug-06 2:44

El Corazon

30-Aug-06 2:44

Steve S wrote:
However, I want to produce a perspective effect on a 2D shape.

http://www.cosc.brocku.ca/Offerings/3P98/course/lectures/3d_perspective/[^]

_________________________
Asu no koto o ieba, tenjo de nezumi ga warau.
Talk about things of tomorrow and the mice in the ceiling laugh. (Japanese Proverb)

Re: Sloped objects - how to transform a set of points

Steve S30-Aug-06 7:27

Steve S

30-Aug-06 7:27

TVM. That sort of helps, except I'm not using OpenGL, but it gives me a few ideas.

Steve S
Developer for hire

How to find permutations

Mushtaque Nizamani28-Aug-06 18:46

Mushtaque Nizamani

28-Aug-06 18:46

How to find all possible permutations from a nth set of characters with kth number, for example to find 2 number permutation from 3 characters.

abc

all possible permutation are here.
ab
ba
ac
ca
bc
cb

Warm Regards,
Mushq

Bassam Abdul-Baki29-Aug-06 2:54

29-Aug-06 2:54

s = {a₁, ..., a_n}.
Loop i₁ from 1 to n.
.
.
.
Loop i_k from 1 to n.
Flag each character as being used or not and skip it if it is being used.
Concatenate s_i₁...s_{i_k}.
If any s_{i_m} is empty for 1 ≤ m ≤ k, then skip it.
This gives all permutatons of length k.

"I know which side I want to win regardless of how many wrongs they have to commit to achieve it." - Stan Shannon

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Mushtaque Nizamani29-Aug-06 4:01

Mushtaque Nizamani

29-Aug-06 4:01

If any sim is empty for 1 ≤ m ≤ k, then skip it.?
Sorry friend i couldn't understand the above sentence, can you please elobrate that.

Bassam Abdul-Baki29-Aug-06 4:11

29-Aug-06 4:11

Assume you had the last L bits flagged as used for the first L iterations (i_L), and for the (L+1)^st bit you were in the (K-L+1)^th position or higher, then all of the characters after this starting position are in use and your character will be empty, so skip the concatenation.

"I know which side I want to win regardless of how many wrongs they have to commit to achieve it." - Stan Shannon

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