Difference between revisions of "Locus Tool"
From GeoGebra Manual
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− | <noinclude>{{Manual Page|version= | + | <noinclude>{{Manual Page|version=5.0}}</noinclude> |
− | {{Tool|name={{PAGENAME}}|type=special line|icon= | + | {{Tool|name={{PAGENAME}}|type=special line|icon=Mode locus.svg}} |
− | : Select a point ''B'' that depends on another point ''A'' and whose locus should be drawn. Then, | + | : Select a point ''B'' that depends on another point ''A'' and whose locus should be drawn. Then, select point ''A'' to create the locus of point ''B''. |
− | : {{Note| Point ''A'' has to be a point on an object (e. g. line, segment/interval, circle).}} | + | : {{Note| Point ''A'' has to be a point on an object (e.g. line, segment/interval, circle).}} |
: {{Example| 1=<br /> | : {{Example| 1=<br /> | ||
::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ||
− | ::* Place a new point ''A'' on the ''x''-axis (see [[ | + | ::* Place a new point ''A'' on the ''x''-axis (see [[File:Mode point.svg|link=|22px]] [[Point Tool|Point]] tool or [[Point Command|Point]] command). |
::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ||
− | ::* Select tool [[ | + | ::* Select the tool [[File:Mode locus.svg|link=|22px]] ''Locus'' and successively select point ''B'' and point ''A''. |
::* Drag point ''A'' along the ''x''-axis to see point ''B'' moving along its locus line.}} | ::* Drag point ''A'' along the ''x''-axis to see point ''B'' moving along its locus line.}} | ||
{{warning|Locus is undefined, if the dependent point depends on [[Point Command]] with two parameters or [[PathParameter Command]].}} | {{warning|Locus is undefined, if the dependent point depends on [[Point Command]] with two parameters or [[PathParameter Command]].}} | ||
− | + | ||
+ | {{note|See also [[Locus Command|Locus]] command.}} |
Latest revision as of 09:59, 3 September 2015
- Select a point B that depends on another point A and whose locus should be drawn. Then, select point A to create the locus of point B.
- Note: Point A has to be a point on an object (e.g. line, segment/interval, circle).
- Example:
- Type
f(x) = x^2 – 2 x – 1
into the Input Bar and press the Enter-key. - Place a new point A on the x-axis (see Point tool or Point command).
- Create point
B = (x(A), f'(x(A)))
that depends on point A. - Select the tool Locus and successively select point B and point A.
- Drag point A along the x-axis to see point B moving along its locus line.
- Type
Warning: | Locus is undefined, if the dependent point depends on Point Command with two parameters or PathParameter Command. |
Note: See also Locus command.