Re: 3d academic project - Graphics Discussion Boards

Re: writing PDF Doc in bitmap format as an image using C#

Henry Minute12-Jan-09 2:28

Henry Minute

12-Jan-09 2:28

For goodness sake Google it. There are thousands of hits for 'pdf conversion' not least of which is ITextSharp.

Henry Minute

If you open a can of worms, any viable solution *MUST* involve a larger can.

[OpenGL] Drawing line with patterns

Naveen15-Dec-08 23:26

Naveen

15-Dec-08 23:26

Hi all,

I want to draw a line with patter "----- -- "( 1111100011000 ). The problem is that, the glLineStipple() function accepts pattern in short variable(16 bits). But in my case there is only 13 bits.

Is there any method to draw a line with the above pattern?

Thanks

nave

[OpenedFileFinder] [My Blog]

Re: [OpenGL] Drawing line with patterns

Dan16-Dec-08 10:23

Dan

16-Dec-08 10:23

Not directly, but you could play with the bit pattern and the scale to make your pattern fit, using the following equation,
pattern bit ( counter / factor ) mod 16

Re: [OpenGL] Drawing line with patterns

Naveen16-Dec-08 16:23

Naveen

16-Dec-08 16:23

Thanks.

I saw this equation in MSDN. But didnt understand the equation correctly. Could you please elobarate it? Does this eqation mean

pattern bit * ( counter / factor ) mod 16

Also what is this counter? How can I change its value?

Thanks

nave

[OpenedFileFinder] [My Blog]

Re: [OpenGL] Drawing line with patterns

Dan16-Dec-08 21:12

Dan

16-Dec-08 21:12

The counter is internal to the raster unit, it is reset to zero on a glBegin and incremented for every antialiased pixel box until glEnd is called.
Factor defines how many pixel blocks are printed for each single bit, so lets say you wanted to print 110011, what you could also do is 101 with factor = 2.
So basically, you may not get the exact pattern you want, but by basing the factor to the smallest consecutive bits you can have a bit more freedom.

Saving a picturebox control to jpg with VB 2005

RobKon15-Dec-08 13:12

RobKon

15-Dec-08 13:12

Hi all,

I have written a program that draws graphics to a picturebox control with GDI+ graphics. I want to be able to save the graphics as a jpg file. What I have done is create a temporary bitmap object and using the pictureboxs DrawToBitmap method copying the picturebox to the bitmap.

Then I have used the bitmap objects Save method to write the jpg file. When I view the the jpg all I see is black with none of the graphics that are on the picturebox control.

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
        Dim bmpMap As New Bitmap(924, 722)
	Dim Rect As Rectangle = imgMap.DisplayRectangle
	imgMap.DrawToBitmap(bmpMap, Rect)
	bmpMap.Save("C:\STARS!\Map.jpg", System.Drawing.Imaging.ImageFormat.Jpeg)
		
End Sub

This code compiles without errors, but the result is not what I expected. Can anyone help please?

Thanks in advance
Rob.

3d academic project

Fadi Yoosuf13-Dec-08 7:09

Fadi Yoosuf

13-Dec-08 7:09

Hi
I am fresh to 3d programmng and currently I have no knowledge about 3d programming libraries.

I have an academic project which has to be completed in 3 months.

An individual has offered me a 3d project. Project requirment is as follows. A webcam will capture a person face which is rotated from left to right, displaying the entire front side of a person. A 3d image is to be created from these data.

Is it feasible to get a clear 3d picture of the face?? If so , will it be feasible to finish the project in 3 months for academic students?

Also can you pls suggest me the best suited library? wpf, opengl or directx or some other??

What else aspects should I know to do the project??

thanks in advance
Fadi

Re: 3d academic project

Expert Coming14-Dec-08 12:35

Expert Coming

14-Dec-08 12:35

That is a hell of an undertaking for someone without ANY 3D knowledge as of now. I would suggest not doing that as your final project. What I would do however is take the aspects that you are good at, combine them, then take a few small things that you are not so good at, and throw them in there.

That would be a very cool application however.

The best way to accelerate a Macintosh is at 9.8m/sec² - Marcus Dolengo

how can i work with pixels to do ( zoom in / out- scale and negative ) a pictue using c# .net please..?

mr.mes10-Dec-08 14:31

mr.mes

10-Dec-08 14:31

is there any one can help with codes or articals or tutorials..
i am reaaly so confused ,,
i don't know how can i work with pixels and designe my application ..?
please need ur help ..

Re: how can i work with pixels to do ( zoom in / out- scale and negative ) a pictue using c# .net please..?

gtag22-Dec-08 0:47

gtag

22-Dec-08 0:47

Hey u can use Aforge.Net which gives u all options to work on a picture.Give reference to dlls related to Aforge. You can get info on Aforge in this site only. In a project called "Image Processing Library" u will get it.

Check it , i am sure that it will help u.

Cheers
Gtag.

(DirectDraw)How to set the color key of an overlay surface(YUY2 16bits)?

linhui3-Dec-08 21:17

linhui

3-Dec-08 21:17

SDK said that the color keys are specified in the raw pixel format. But I don't know how to set this value for YUY2 16bits. For YUY2 16bits, the byte ordering is: Y0, (U0 + U1)/2, Y1, (V0 + V1)/2, ...... If I want to use the pixel 0 as the color key, how to set the dwColorSpaceLowValue of struct DDCOLORKEY?
I try many times, but it can't work. Who can help me? Thanks.

Re: (DirectDraw)How to set the color key of an overlay surface(YUY2 16bits)?

linhui4-Dec-08 14:52

linhui

4-Dec-08 14:52

The byte ordering should be Y0, U0, Y1, V0, Y2, U1, Y3, V1...

Calculating Homography

VincentOng2-Dec-08 23:51

VincentOng

2-Dec-08 23:51

Hi all,
I want to calculate the homography assuming i have 4 points in the original image and 4 points in the resulted image.

x' = xH where x' is the points in the resulted image, H is the homography and x is points in the original image. Please help! Thanks!

this.webBrowser1.Document.Body.InnerHtml +=@"&lt br/ &gt" not working

Manish Majithia2-Dec-08 2:41

Manish Majithia

2-Dec-08 2:41

this.webBrowser1.Document.Body.InnerHtml +=@"<br/>"
concatenates <BR> to this.webBrowser1.Document.Body.InnerHtml

I am pretty confused what is happening is it a bug or what?

[wxWidgets] Managing on click mouse event

EternallyConfuzzled1-Dec-08 6:24

EternallyConfuzzled

1-Dec-08 6:24

Hi, Do You know how can the click mouse event be managed ?
In particular I'd like to know if it's possible receive, when I keep pressed the left mouse button, a sequential serie of mouse click events.
I'm interested into this fact because I'd like to implement scrolling in a custom control letting the possibility to scroll keeping pressed the left button with no necessity to click continuosly the mouse button.

Thanks.
Stefano.

Graph layout [OK]

ventomito26-Nov-08 8:05

ventomito

26-Nov-08 8:05

Hello folks,
i'm searching for a class or any sample code to organize a graph (map or network).
I try to explain better, i just want to display a graph in a fine way, clear and well spaced.
Thanks in advance

Program your life ^^

modified on Wednesday, January 7, 2009 3:39 PM

Re: Graph layout

Drew Stainton30-Dec-08 11:49

Drew Stainton

30-Dec-08 11:49

Lookup "simulated annealing" - it's a good algorithm for laying out all kinds of data, from map labels to graphs.

Cheers,
Drew.

Re: Graph layout

ventomito7-Jan-09 9:39

ventomito

7-Jan-09 9:39

Thank you Drew.
Btw i found a great library for whoever need it:
http://jung.sourceforge.net/doc/index.html[^]

It helped me, maybe someone is intersted.
Enrico

Program your life ^^

¿Quién sabe? alphablending 2 bitmaps

Chesnokov Yuriy26-Nov-08 2:00

Chesnokov Yuriy

26-Nov-08 2:00

There 2 32bpp bitmaps with some images:

bitmap1
bitmap2

and graphics object g1 created from bitmap1

I set individualy alpha values in bitmap2 using LockBits:

C++

Gdiplus::BitmapData bitmapData;
Gdiplus::Status s = pBitmap->LockBits(&Gdiplus::Rect(0, 0, pBitmap->GetWidth(), pBitmap->GetHeight()),
                                      Gdiplus::ImageLockModeWrite | Gdiplus::ImageLockModeRead,
                                      PixelFormat32bppRGB, &bitmapData);
if (s == Gdiplus::Ok) {
        unsigned int* pPixels = (unsigned int *)bitmapData.Scan0;
        for (unsigned int i = 0; i < bitmapData.Height; i++) {
                for (unsigned int j = 0; j < bitmapData.Width; j++) {
                        if (mask(i, j) > 0)
                                pPixels[j] &= 0xFFFFFFFF;
                        else
                                pPixels[j] = 0x00FFFFFF;
                }
                pPixels += bitmapData.Stride / 4;
        }
        pBitmap->UnlockBits(&bitmapData);
}

And then draw it on bitmap1 using g1. But the alpha blending does not happen?

chesnokov

Re: ¿Quién sabe? alphablending 2 bitmaps

Mark Salsbery26-Nov-08 5:43

Mark Salsbery

26-Nov-08 5:43

Chesnokov Yuriy wrote:
Gdiplus::Status s = pBitmap->LockBits(&Gdiplus::Rect(0, 0, pBitmap->GetWidth(), pBitmap->GetHeight()),
Gdiplus::ImageLockModeWrite | Gdiplus::ImageLockModeRead,
PixelFormat32bppRGB, &bitmapData);

Shouldn't that be Format32bppArgb?

The pBitmap bitmap must be Format32bppArgb as well.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

Re: ¿Quién sabe? alphablending 2 bitmaps

Chesnokov Yuriy26-Nov-08 19:50

Chesnokov Yuriy

26-Nov-08 19:50

you're the MVP.
Muchos gracias!
I do not believe how can I omited that ARG in this call? They were all ARGB created and cloned, but that single LockBits somehow avoided ARGB. Ohhh

Чесноков

Some problems with DirectSound library

andrei_b25-Nov-08 4:50

andrei_b

25-Nov-08 4:50

Hi! I'm using Visual C++ 2005 Express Edition and I am trying to create an application that uses DirectSound. I found on DirectSound Documentation how to initiate it, but I still have some problems. When I initiate last member of DSBUFFERDESC (the struct that describes the characteristics of a new buffer), i get this error:

1>main.obj : error LNK2019: unresolved external symbol _GUID_NULL 
referenced in function "void __cdecl InitDirectSound(struct HWND__ *)" (?InitDirectSound@@YAXPAUHWND__@@@Z)

Here is the code, where "GUID_NULL" (which is defined in dsound.h) appears:

DSBUFFERDESC pcDSPrimaryBufferDesc,
pcDSPrimaryBufferDesc.guid3DAlgorithm=GUID_NULL;

On my project Propetries>>Configuration Propetries>>Linker>>Input>>ADDITIONAL DEPENDENCIES I added dsound.lib, but on DirectX Documentation it says that some DirectSound functions use Dsound3d.dll as import library. Where should I add it? what did I missed? Frown | :(

Thank you in advance!

Re: Some problems with DirectSound library

Mark Salsbery25-Nov-08 9:16

Mark Salsbery

25-Nov-08 9:16

Member 3796009 wrote:
On my project Propetries>>Configuration Propetries>>Linker>>Input>>ADDITIONAL DEPENDENCIES I added dsound.lib

Try adding Dxguid.lib as well.

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

help! usb camera filter Driver

hongqibudao24-Nov-08 14:29

hongqibudao

24-Nov-08 14:29

I want to write a filter Driver for usb camera, but i don't how to do. anyone can help me? my email : forever_28@yahoo.cn

Re: help! usb camera filter Driver

Smithers-Jones14-Jan-09 23:13

Smithers-Jones

14-Jan-09 23:13

I want to build a space ship that flies me to Ganymed, but I don't know how to do. Anyone can help me? my email: forever_dumb@yahoo.cn

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