This example demonstrates the use of the <#8895#>X<#8895#> (intersect) and
<#8896#>ON<#8896#> (projection) operators.
A triangle with its projection lines is drawn, showing the
intersection of the three projection lines trough one point.
Again, the coordinates of <#8897#>a<#8897#>, <#8898#>b<#8898#> and <#8899#>c<#8899#> should
be judiciously chosen to fit the screen.
#litout8946#
The resulting picture looks like:
(315,220)<#8939#>
(010,030)<#8929#>(1,0)<#8902#>240<#8902#><#8929#>
(250,030)<#8930#>(-1,3)<#8903#>060<#8903#><#8930#>
(010,030)<#8931#>(1,1)<#8904#>180<#8904#><#8931#>
272
(010,030)<#8905#>A<#8905#>
(250,030)<#8906#>B<#8906#>
(190,210)<#8907#>C<#8907#>
(100,120)<#8932#>#math281##tex2html_wrap_inline9357#<#8932#>
(220,120)<#8933#>#math282##tex2html_wrap_inline9359#<#8933#>
(130,030)<#8934#>#math283##tex2html_wrap_inline9361#<#8934#>
273
(010,030)<#8935#>(3,1)<#8911#>216<#8911#><#8935#>
(226,101)<#8912#>PA<#8912#>
274
(250,030)<#8936#>(-1,1)<#8913#>120<#8913#><#8936#>
(130,150)<#8914#>PB<#8914#>
275
(190,210)<#8937#>(0,-1)<#8915#>180<#8915#><#8937#>
(190,030)<#8916#>PC<#8916#>
276
(190,090)<#8917#>X<#8917#>
277
(010,010)<#8918#>X = ( 3.700000e+02, 2.800000e+02)<#8918#>
<#8939#>
Further examples are included with the distributed software.
#./h06.tex#
#figure9362#
#figure9363#
#figure9364#