Unidraw global constants, types, instances, and functions.
Several constants and types are used throughout the Unidraw library.
It also provides global access to one-of-a-kind instances such as the
unidraw object as well as shared graphics resources. Finally, there
are several global functions for common data manipulations. All of
these are declared one file for inclusion into other files where they
- static const int CHARBUFSIZE
Size of standard character buffer.
- static const int HANDLE_SIZE
Size of selection handles, in pixels.
- static const char MARK
String that delineates data boundaries in the ASCII representation
that Catalog generates. Used for error checking.
- static const int PIN_RAD
The radius of a pin, used in its default graphical representation, in
- static const int SLOP
Tolerance within which a hit on a graphical object will be detected, in pixels.
- enum DragConstraint
Enumerates orthogonal ways in which cursor movement may be
constrained, usually during direct manipulation. Possible values
include None, XFixed, YFixed, XYEqual,
HorizOrVert, or Gravity.
- enum Mobility
Enumerates the three possible component mobilities: Fixed,
Floating, or Undef (undefined).
- typedef unsigned Orientation
Specifies two kinds of orientation: Portrait or Vertical
(synonymous), and Landscape or Horizontal (synonymous).
- enum TransMethod
Enumerates the three possible transmission methods for connectors:
In, Out, or InOut.
- typedef unsigned long ClassId
Type for representing unique class names for catalog-managed objects.
- extern Unidraw* unidraw
- extern CSolver* csolver
The global unidraw and csolver objects. These and all other global
instances are initialized automatically.
- extern PSColor* psblack
- extern PSColor* pswhite
- extern PSPattern* pssolid
- extern PSPattern* psclear
- extern PSPattern* psnonepat
- extern PSBrush* pssingle
- extern PSBrush* psnonebr
- extern PSFont* psstdfont
Predefined graphics resource objects. The None operation on
psnonepat and psnonebr returns true.
- extern Graphic* stdgraphic
A FullGraphic instance with its graphics state set to the global
values listed above, excluding psnonepat and psnonebr.
- extern void NormalRect(Coord& l, Coord& b, Coord& r, Coord& t)
Given two coordinate pairs (l, b) and (r,
t), it checks whether l < r and b < t.
If not, it swaps the values in the offending inequalities. This
function is useful for ensuring that a rectangle is defined by its
lower-left and upper-right vertices.
- extern void GetLine(
- const char* buf, int len, int beg, int& end,
- int& size, int& nextBeg
This function is convenient for extracting lines from a buffer with a
minimum of additional math operations. Given a buffer of characters
buf of length len, search for the first newline character
(or the last character in the buffer) after the character at index
beg; return the newline's position in end, the size of the
run of text terminated by a newline (end + 1 - beg), and
the index with which to begin a search for the next newline character
- extern void GetAlignmentPoint(
- Graphic*, Alignment, float&, float&
Return the point (in floating point canvas coordinates) on a graphic
corresponding to the given alignment. For example, to obtain the
coordinates of the lower-left of a rectangle graphic, specify the
graphic and a BottomLeft alignment.
- extern void Ref(Resource*)
Call the Reference operation on the given instance of a resource
subclass if the pointer is non-nil.
- extern char* strnew(const char*)
Duplicate the given null-terminated string, creating a buffer of the
appropriate size and returning the null-terminated result.