| ostream& operator<< (ostream& o, Point& p) | Non-member function |
Used in Path::output() for writing
the x and y values of the projective_coordinates of Points to
out_stream. See Path Reference; Outputting.
This is a low-level function that ordinary users should never have to
invoke directly.
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| void output (void) | Function |
Writes the MetaPost code for drawing or undrawing a Point to
out_stream. Called by Picture::output(), when a
Shape on the Picture is a Point.
See Picture Reference; Outputting.
|
| void suppress_output (void) | Virtual function |
Sets do_output to false, which causes a Point
not to be output. This function is called in
Picture::output(), when a Point cannot be projected.
See Picture Reference; Outputting.
|
| virtual void unsuppress_output (void) | Virtual function |
Resets do_output to true, so that a Point can
potentially be output, if Picture::output() is called again for
the Picture the Point is on.
This function is called in
Picture::output().
See Picture Reference; Outputting.
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vector<shape*> extract (const Focus& f, const unsigned short proj, real factor)
|
Function |
Attempts to project the Point
using the arguments passed to Picture::output(), which calls this
function. If extract() succeeds,
it returns a vector<shape*> containing only the Point.
Otherwise, it returns an empty vector<shape*>.
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| bool set_extremes (void) | Virtual function |
Sets "extreme" values
for x, y, and z in projective_coordinates. This
is, of course, trivial for
Points, because they only have one x, y and z-coordinate.
So the maxima and minima for each coordinate are always the same.
|
valarray <real> get_extremes (void)
|
Virtual inline const function |
Returns projective_extremes.
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| real get_minimum_z (void) | Virtual const function |
| real get_maximum_z (void) | Virtual const function |
| real get_mean_z (void) | Virtual const function |
These functions return the minimum, maximum, and mean z-value of the
Point.
get_minimum_z() returns projective_extremes[4],
get_maximum_z() returns projective_extremes[5], and
get_mean_z() returns
(projective_extremes[4] + projective_extremes[5]) / 2.
However, since a Point has only one z-coordinate
(from world_coordinates), these values will all be the same.
These functions are pure virtual functions in |