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<TITLE>Tao User Manual -- Hammer Methods</TITLE>
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<H3>Hammer Methods</H3>
For a description of the Hammer device see section <A HREF="UserManual_26.html">*</A>.
The following methods are available with a hammer.
<P><PRE>
reset()
drop()
(<accessPoint>)
(<instr>, <x>)
(<instr>, <x>, <y>)
setMass(<m>)
setPosition(<p>)
setInitVelocity(<v>)
setGravity(<g>)
setHeight(<h>)
setDamping(<d>)
setHardness(<h>)
setMaxImpacts(<maxImpacts>)
getMass()
getPosition()
getVelocity()
getInitVelocity()
getGravity()
getHeight()
getDamping()
getHardness()
numberOfImpacts()
getMaxImpacts()
</PRE>
<P>The <CODE>reset</CODE><A NAME="1"> method</A> resets the hammer to its initial height and
causes it to wait for a subsequent call to the <CODE>drop</CODE><A NAME="2"> method</A>
before the hammer will start falling and interacting with the instrument.
As with the bow device there are three unnamed methods for specifying
the access point with which the hammer will interact. The first expects
an access point, the second an instrument name and a single <I>x</I> coordinate
and the third an instrument name followed by an <I>x</I> and <I>y</I> coordinate.
<P>The <CODE>set...</CODE> family of methods are used to set the various attributes
of the hammer. Note that the <CODE>setHeight</CODE> method sets the height from
which the hammer is dropped whereas the <CODE>setPosition</CODE> method sets
the instantaneous height of the hammer. The <CODE>setInitVelocity</CODE> method
sets the initial velocity of the hammer immediately after the <CODE>drop</CODE>
method has been called. The <CODE>setHardness</CODE> method sets the strength
of the spring which is used to simulate the elastic connection with the
instrument. This is usually a value in the range [0..1] where 0 means
the spring has no effect and 1 means that the spring has the same strength
as the springs used in <B>Tao</B>'s material. Values greater than 1 can also
be used although this can lead to the model becoming unstable, due to
the inherent limitations in modeling a continuous physical system using
discrete time steps or ticks.
<P>
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<tr><td colspan="3" class="addr"><!-- bottom panel --><ADDRESS><FONT SIZE=-1>©1999,2000 Mark Pearson
<A HREF="mailto:m.pearson@ukonline.co.uk">m.pearson@ukonline.co.uk</A> April 30, 2000</ADDRESS><BR></td></tr><!-- end bottom panel --></table></BODY></HTML>
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