### Author Topic: Any Quadrangle can be a square  (Read 7222 times)

0 Members and 1 Guest are viewing this topic.

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Any Quadrangle can be a square
« on: October 13, 2011, 08:52:38 PM »
I found any quadrangle in perspective view can be a projection of sqare.
I made a drawing using only ruler and compass to decide a squre from any quadrangle.
Best Regards,

Junichi Yoda
http://june.minibird.jp/

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Re: Any Quadrangle can be a square
« Reply #1 on: October 14, 2011, 04:17:40 PM »
This drawing has Visio intelligence.
You can analyse how they change, when you change the quadrangle 1.

You can move quadrangle 1 with controls at the corner 1.
Square will move without rotation linked with the control
at another corner of quadrangle 1,
and will keep square,
but view point will not move.

enables you to move another 2 controls.
Aspect ratio of quadrangle will change,
then view point will move, and square rotate, but stay square.

« Last Edit: October 15, 2011, 06:43:38 AM by JuneTheSecond »
Best Regards,

Junichi Yoda
http://june.minibird.jp/

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Re: Any Quadrangle can be a square
« Reply #2 on: October 15, 2011, 09:42:34 PM »
Visio drawing was modified to move correctly in "Free Depth" mode.
Best Regards,

Junichi Yoda
http://june.minibird.jp/

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Re: Any Quadrangle can be a square
« Reply #3 on: October 17, 2011, 07:45:22 AM »
Added a description of how to make this drawing in a step by step mode.
Best Regards,

Junichi Yoda
http://june.minibird.jp/

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Re: Any Quadrangle can be a square
« Reply #4 on: October 19, 2011, 08:32:02 PM »
I made java applet version at
http://june.carrots.jp/perspective/cinderella/index.html

You can move red control point 1,2, and 3.
Also you can move red vanishing point 1 and 2.
But green View point is defined automatically.

if view point is properly selected".

I hope it will help young people studying perspective drafting and projective geometry.
Hope you enjoy.
« Last Edit: November 08, 2011, 06:52:05 PM by JuneTheSecond »
Best Regards,

Junichi Yoda
http://june.minibird.jp/

#### JuneTheSecond

• Hero Member
• Posts: 1027
##### Re: Any Quadrangle can be a square
« Reply #5 on: November 02, 2011, 02:54:21 AM »
I've collected my latest Visio drawings and stencils in one home page at
"STUDY of PERSPECTIVE VIEW with VISIO"
http://june.carrots.jp/perspective/index.html
Some of them are transformed into pdf files.
« Last Edit: November 02, 2011, 02:57:21 AM by JuneTheSecond »
Best Regards,

Junichi Yoda
http://june.minibird.jp/