Difference between revisions of "DynamicCoordinates Command"
From GeoGebra Manual
m (Text replace - "<div class="box info"> 48px|left This page is part of the official manual for print and pdf. For structural reasons normal users can't edit this page. If you found any errors on this page please contact ) |
|||
Line 1: | Line 1: | ||
− | <noinclude>{{Manual Page|version=4. | + | <noinclude>{{Manual Page|version=4.2}}</noinclude> |
{{command|geogebra}} | {{command|geogebra}} | ||
;DynamicCoordinates[ <Point A>, <Number X>, <Number Y> ] | ;DynamicCoordinates[ <Point A>, <Number X>, <Number Y> ] |
Revision as of 21:13, 9 March 2013
- DynamicCoordinates[ <Point A>, <Number X>, <Number Y> ]
- Creates a point with coords (X, Y). This point is dependent, but can be moved. Whenever you try to move the new point to coordinates (x,y), point A is moved there and coordinates for the new point are calculated. Works best if point A is not visible and dragging is done with the mouse. At least one of X and Y should depend on A.
Example:
B = DynamicCoordinates[A, round(x(A)), round(y(A))]
.When you try to move B to (1.3, 2.1) using the Move Tool, point A becomes (1.3, 2.1) and B appears at (1,2).B = DynamicCoordinates[A, x(A), min(y(A), sin(x(A))) ]
creates a point under sin(x).
- Note: PointIn[y<sin(x)] is the easier solution in this case.
- The following examples show other ways to restrain the positions of a point C: let A = Point[xAxis] and B = Point[xAxis]. Now type in the Input Bar:
DynamicCoordinates[B, Min[x(B), x(A)], 0]
, and press Enter
SetVisibleInView[B, 1, false]
, and press EnterSetLayer[C, 1]
, and press Enter
Now, C cannot be moved to the right of A.
- Define A=(1,2). Now, type in the Input Bar:
SetVisibleInView[A, 1, false
and press EnterB = DynamicCoordinates[A, If[x(A) > 3, 3, If[x(A) < -(3), -3, If[x(A)< 0, round(x(A)), x(A)]]], If[x(A) < 0, 0.5, If[y(A) > 2, 2, If[y(A) <0, 0, y(A)]]]]
, and press Enter, - This example makes A a sticky point when a point C is dragged near it.
Define A = (1,2) and B = (2,3). Now, type in the Input Bar:SetVisibleInView[B, 1, false]
and press EnterC = DynamicCoordinates[B, If[Distance[A, B] < 1, x(A), x(B)], If[Distance[A, B] < 1, y(A), y(B)]]
.