A challenge - any takers?

[RTK]

How would one go about creating an image as attached, in Xara X? I tried but got nowhere...

I could not even get the lines to twist that way... [img]/infopop/emoticons/icon_rolleyes.gif[/img] The brush feature would for sure come in handy for this... but I could not get the spacing right [img]/infopop/emoticons/icon_rolleyes.gif[/img]

The image was created by a designer named Takenobu Igarachi, as a poster for the Kanagawa Art Festival, 1984 (Japan.) The image is used for educational purposes so I don't think I can get anyone in trouble for posting it. If a moderator is of a different opinion, they may delete this... without any hard feelings from my part [img]/infopop/emoticons/icon_wink.gif[/img]

What do you guys and gals think?

Risto

risto@ristoklint.com

Visit my web site!

[RTK]

How would one go about creating an image as attached, in Xara X? I tried but got nowhere...

I could not even get the lines to twist that way... [img]/infopop/emoticons/icon_rolleyes.gif[/img] The brush feature would for sure come in handy for this... but I could not get the spacing right [img]/infopop/emoticons/icon_rolleyes.gif[/img]

The image was created by a designer named Takenobu Igarachi, as a poster for the Kanagawa Art Festival, 1984 (Japan.) The image is used for educational purposes so I don't think I can get anyone in trouble for posting it. If a moderator is of a different opinion, they may delete this... without any hard feelings from my part [img]/infopop/emoticons/icon_wink.gif[/img]

What do you guys and gals think?

Risto

risto@ristoklint.com

Visit my web site!

[molucca]

Looks a lot like a Smith Chart. You might look to see how the chart type is created. Rich

[Egg Bramhill]

I was going to go to bed about 3 hours ago!!!;-)
I had to have a go at your challenge. Here's my effort. It could do with a lot more work, but I have to sleep some time!
As Rich say's it looks a great deal like a Smith chart, but what the hell that is I've no idea. I'll have to do a search on the internet. Meanwhile this ones 100% XaraX.
Egg

[Egg Bramhill]

.

[Egg Bramhill]

The image above was created using blends converted to shapes. A brush of a single red dot was then created and aplied to the lines. After this it was a matter of copying lines and applying different line widths an strokes.
During this drawibg I got a very odd error which I've never come across before. I attach a screen grab.
Egg

[Egg Bramhill]

.......and came up with the following:
What is it?
It is a polar plot of the complex reflection coefficient (called gamma herein), or also known as the 1-port scattering parameter s or s11, for reflections from a normalised complex load impedance z = r + jx; the normalised impedance is a complex dimensionless quantity obtained by dividing the actual load impedance ZL in ohms by the characteristic impedance Zo (also in ohms, and a real quantity for a lossless line) of the transmission line.

The contours of z = r + jx (dimensionless) are plotted on top of this polar reflection coefficient (complex gamma) and form two orthogonal sets of intersecting circles. The centre of the SMITH chart is at gamma = 0 which is where the transmission line is "matched", and where the normalised load impedance z=1+j0; that is, the resistive part of the load impedance equals the transmission line impedance, and the reactive part of the load impedance is zero.

The complex variable z = r + jx is related to the complex variable gamma by the formula


1 + gamma
z = r+jx = -----------
1 - gamma


and of course, the inverse of this relationship is

z - 1 (r-1) + jx
gamma = -------- = ------------
z + 1 (r+1) + jx



Which was found here

So now you all know!

[Egg Bramhill]

If you want to view the xar file.....

[roman]

Thumbs Up Egg.

[Ross Macintosh]

I knew that! Sure I did. I'm mean ya I do. I've known it since I was a little kid. Little kid - ya that's the ticket. To be perfectly honest, I've definitely known that stuff since I was a little kid.

Thanks for reminding me.

Regards, Ross

PS - I like your design