How can we draw fixed ray or line , no effect of zoom and moving axes(drag).

Math123 shared this question 3 years ago

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How can draw fixed horizontal and vertical line and ray so that Axes movement( as we drag the axes position) and zooming does not change the position of line.

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Comments (17)

mathmagic ● 3 years ago

create the line m

then AttachCopyToView( m, 1 )

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Math123 ● 3 years ago

Thanks mathmagic. It worked for line . How to do same for ray. It is not working for ray. i can draw horizontal ray from line by fixing domain by if[] command it worked. but for vertical ray i can not fixed domain. like line x=2 and i want ray between -5<= y <= 2 .

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mathmagic ● 3 years ago

I think it is a bug with ray. the command works for line and segment

meantime create two points A,B

C=AttachCopyToView( A, 1 )

D=AttachCopyToView( B, 1 )

then ray(C,D)

x=2&&-5<=y<=2 equal to segment((-5,2),(2,2))

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Math123 ● 3 years ago

x=2&&-5<=y<=2

x=2&&y<=2

Not working

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mathmagic ● 3 years ago

I mean you must to use segment instead

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Math123 ● 3 years ago

vertical ray not working it displace position when zoom and axes scale.

C=AttachCopyToView( A, 1 )

D=AttachCopyToView( B, 1 )

then ray(C,D)

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mathmagic ● 3 years ago

revise

it works for me version 5

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Math123 ● 3 years ago

thanks it worked. with little bit changes. I draw point not on the ray slight up / down from the ray. It creates a ray slight up. Then i adjust the height of the original point.

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rami ● 3 years ago

one possibility more

Files: AttachCopy_Ray0...

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Math123 ● 3 years ago

Pls see attached. When i draw line and ray separate it worked fine. But when i draw horizontal line and put a point on the line then draw horizontal ray with that point it did not work. It moves with zoom and axes.

Files: Line-ray.ggb

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mathmagic ● 3 years ago

first attach all points then create the rest of structure

when the bug is fixed first create the line and ray then attach them

Files: foro.ggb

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rami ● 3 years ago

use absolut unit 1 (h and v), so the PathParameter of B and C are also absolut

Note: h and v are also the absolute zoom factor relative to standard-view, used when h and v was created (so not a indication in % from the last zoom)

Files: AttachCopy_Ray0...

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rami ● 3 years ago

additional

"A" is a PointIn(<absolut square>) and can be moved AND is absolute.

Files: AttachCopy_Ray0...

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mathmagic ● 3 years ago

great trick

this solve the question : how get corners of text for a text with "absolute position on screen"?

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rami ● 3 years ago

try:

A=PointIn(<absolut square>)

<relativeText> properties/position=A

and then create the corners of <relativeText>

(instead of "move <relativeText>" move A)

Files: AttachCopy_Ray0...

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Math123 ● 3 years ago

Thanks

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Michael Borcherds ● 3 years ago

Thanks, AttachCopyToView(ray,1) fixed for next release (v547)

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