vBegin Library Method
Short Description: Set initial velocity
Signature: t.vBegin (x,y,z) or (v)
Group: Motion
Class: transition Class
Implicitely sets the acceleration used for a motion with constant acceleration
by specifying the inital velocity of the object at the beginning of the
transition.
The acceleration is calculated so that the object
has the specified initial velocity and that it reaches the specified end point of
the motion in specified the duration.
Please refer to Motions for an explanation of
motion with constant acceleration. Default acceleration is zero.
Sample HTML
element with id="sample"
If the velocity is given in scalar form it works in the direction of the
motion (or against it in case v<0) with magnitude v.
In this case either starting or end point or both have to be set (e.g.
using from or to) and must not be identical.
Duration needs to be set before using this method. Also note
that the acceleration may be set just once using one of the functions
acceleration, vBegin
and vEnd.
taccgl.actor("sample") . to({oy:500}). vBegin(0) . dur(5). start() | RUN |
taccgl.actor("sample") . to({oy:500}). vEnd(0) . dur(5). start() | RUN |
taccgl.actor("sample") . to({oy:500}). vBegin(1000) . dur(1). start() | RUN |
taccgl.actor("sample") . to({oy:500}). vBegin(1000) . dur(5). start() | RUN |
taccgl.actor("sample") . to({oy:500}). vBegin(0,1000,0) . dur(5). start() | RUN |
taccgl.actor("sample") . to({oy:500}). vBegin(-1000) . dur(5). start() | RUN |
Acceleration and velocity can as well be given in vector form. The examples below show various
values and directions for the initial velocity and the acceleration.
taccgl.actor("ball") . dur(2). vBegin(0,-500,0). start() | RUN |
taccgl.actor("ball") . to({ox:-500}). dur(2). vBegin(0,-500,0). start() | RUN |
taccgl.actor("ball") . to({ox:-500}). dur(2). vBegin(500,-500,0). start() | RUN |
taccgl.actor("ball") . to({ox:-500}). dur(2). vBegin(-500,-500,0). start() | RUN |
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3D Animation
