Point at absolute screen position

Try:

A = Corner[1]

B = Corner[3]

(A + B)/2

hello

in pre-release version the command corner[1] or corner[2] corner[3] corner[4] give the corners of screen

you can see an example in http://www.geogebra.org/en/...

saludos

Thank you, Murkle and Mathmagic, for your information.

The "corner solution" is a good solution. It is i.m.o. more consistant with Geogebra's paradigmata. If points get the feature to be fixed at some screen position the next question might be: how about circles, lines and so on? I see, we should leave it as it is now. (I.m.o. not against the paradigmata, however, is to implement "Locus[<Number>, <Point> ] in addition to Locus[ <Point>, <Point> ]).

B.t.w.: The little context help (F1) is up to date if the english language is chosen. The german context help is lacking of the syntax "Corner[ <Number> ]" = "Eckpunkt[ <Zahl> ]". That's why I never had the idea to use this function.

Konrad Remus

Just define them in terms of fixed points :)

If you have a way to calculate the point from the number, can't you use the Curve command?

How to make always a fixed point when shift and zoom anywhere in 2d?

A (Corner[1]) is fixed to the shift and zoom

B (Corner[1] + 4) is fixed in shift and move when zoom

B (x (A) +4, y (A) +4) is fixed in shift and move when zoom

Absolute-Position is allway relative to Corner[4]

Corner[2] is allway changed when zoom or position of (0,0) or relation X/Y axis is changed (script in Corner[2] for synchronice).

The absolute Position can't be in ggb-units, it must be in pixels. This need a dynamic value for the size of 1 pixel in ggb-units.

This is a workaround for your idea "Add a menu item absolute position" (I vote this idea)

create a point P then type in input bar AttachCopyToView[P, 1]

hide P

I do not understand.

That's just the point.

In:

(

Distance [Corner [1], Corner [2]] / x (Corner [5] + (2, 2)),

Distance [Corner [1], Corner [4]] / y (Corner [5] + (2, 2))

)

Does not work.

What to enter here?

(?,?)

see this A; is it you want?

zoom, move the axis etc

say why not

First: the solution of mathmagic is much more nice. Use this.

----------------------------------------------------------------------------------------------------------

My solution works too.

pixX = Distance[Corner[1], Corner[2]] / x(Corner[5] + (2, 2))

is the length of 1 pixel in the Xdirection depending of the actual zoom-factor (analog for pixY)

The point ""Absolut" has his cartesian-coordinates (something else is not possible) BUT this coordinates are changed by the script in C_2 (Corner[2]) (allway when something change at the windows). And he is fixed, so the user can't shift him (only the script in C_2).

You can see the function of (simulated) absolut position when you

- change the size of the applet

- change x/y relation

- move the graphic-windows

- zoom-In -Out

Then the point is allway at the same place similare as a text with absolut position.

(also the point A in the solution of mathmagic)

One solution:

Create point A.

In the console:

AttachCopyToView [A, 1]

This will create a point B coordinates which control the moving A.

Not a big improvement:

The properties of B is:

AttachCopyToView [A, 1, (some numbers, some numbers), (some numbers, some numbers), (0, 684), (934, 0)]

You can add a slight improvement from:

x (Corner [5])

y (Corner [5])

For example:

AttachCopyToView [A, 1, (some numbers, some numbers), (some numbers, some numbers), (0, 684), (x (Corner [5]), 0)]

Allows not crawl point B when compressed window borders.