Provide facilities for 2D graphical output
"
graphical"
coordinate system and is
associated with a rectangular plotting area in the underlying graphics system. This
plotting area is where graphical output appears. It is defined when the Plot is
created.
The current Frame of a Plot describes a "
physical"
coordinate system, which is the
coordinate system in which plotting operations are specified. The results of each
plotting operation are automatically transformed into graphical coordinates so
as to appear in the plotting area (subject to any clipping which may be in
effect).
Because the Mapping between physical and graphical coordinates may often be non-linear, or even discontinuous, most plotting does not result in simple straight lines. The basic plotting element is therefore not a straight line, but a geodesic curve (see astCurve, astGenCurve and astPolyCurve). A Plot also provides facilities for drawing markers or symbols (astMark), text (astText) and grid lines (astGridLine). It is also possible to draw curvilinear axes with optional coordinate grids (astGrid). A range of Plot attributes is available to allow precise control over the appearance of graphical output produced by these functions.
You may select different physical coordinate systems in which to plot (including the native graphical coordinate system itself) by selecting different Frames as the current Frame of a Plot, using its Current attribute. You may also set up clipping (see astClip) to limit the extent of any plotting you perform, and this may be done in any of the coordinate systems associated with the Plot, not necessarily the one you are plotting in.
Like any FrameSet, a Plot may also be used as a Frame. In this case, it behaves like its current Frame, which describes the physical coordinate system.
When used as a Mapping, a Plot describes the inter-relation between graphical coordinates (its base Frame) and physical coordinates (its current Frame). It differs from a normal FrameSet, however, in that an attempt to transform points which lie in clipped areas of the Plot will result in bad coordinate values (AST__BAD).
Abbrev: Abbreviate leading fields?
Border: Draw a border around valid regions of a Plot?
Clip: Clip lines and/or markers at the Plot boundary?
ClipOp: Combine Plot clipping limits using a boolean OR?
Colour(element): Colour index for a Plot element
DrawAxes(axis): Draw axes for a Plot?
DrawTitle: Draw a title for a Plot?
Escape: Allow changes of character attributes within strings?
Edge(axis): Which edges to label in a Plot
Font(element): Character font for a Plot element
Gap(axis): Interval between linearly spaced major axis values
Grf: Select the graphics interface to use.
Grid: Draw grid lines for a Plot?
Invisible: Draw graphics in invisible ink?
LabelAt(axis): Where to place numerical labels for a Plot
LabelUnits(axis): Use axis unit descriptions in a Plot?
LabelUp(axis): Draw numerical Plot labels upright?
Labelling: Label and tick placement option for a Plot
LogGap(axis): Interval between logarithmically spaced major axis values
LogPlot(axis): Map the plot onto the screen logarithmically?
LogTicks(axis): Space the major tick marks logarithmically?
MajTickLen(axis): Length of major tick marks for a Plot
MinTickLen(axis): Length of minor tick marks for a Plot
MinTick(axis): Density of minor tick marks for a Plot
NumLab(axis): Draw numerical axis labels for a Plot?
NumLabGap(axis): Spacing of numerical axis labels for a Plot
Size(element): Character size for a Plot element
Style(element): Line style for a Plot element
TextGapType: Controls interpretation of TextLabGap and TitleGap
TextLab(axis): Draw descriptive axis labels for a Plot?
TextLabGap(axis): Spacing of descriptive axis labels for a Plot
TickAll: Draw tick marks on all edges of a Plot?
TitleGap: Vertical spacing for a Plot title
Tol: Plotting tolerance
Width(element): Line width for a Plot element
astBBuf: Begin a new graphical buffering context
astBorder: Draw a border around valid regions of a Plot
astBoundingBox: Returns a bounding box for previously drawn graphics
astClip: Set up or remove clipping for a Plot
astCurve: Draw a geodesic curve
astEBuf: End the current graphical buffering context
astGenCurve: Draw a generalized curve
astGetGrfContext: Get the graphics context for a Plot
astGrfPop: Retrieve previously saved graphics functions
astGrfPush: Save the current graphics functions
astGrfSet: Register a graphics routine for use by a Plot
astGrid: Draw a set of labelled coordinate axes
astGridLine: Draw a grid line (or axis) for a Plot
astMark: Draw a set of markers for a Plot
astPolyCurve: Draw a series of connected geodesic curves
astRegionOutline: Draw the outline of an AST Region
astText: Draw a text string for a Plot
"
(Grid1)"
and "
(Grid2)"
) or together (e.g. "
(Grid)"
):
Axes: Axis lines drawn through tick marks using astGrid
Axis1: Axis line drawn through tick marks on axis 1 using astGrid
Axis2: Axis line drawn through tick marks on axis 2 using astGrid
Border: The Plot border drawn using astBorder, astGrid or astRegionOutline
Curves: Geodesic curves drawn using astCurve, astGenCurve or astPolyCurve
Grid: Grid lines drawn using astGridLine or astGrid
Grid1: Grid lines which cross axis 1, drawn using astGridLine or astGrid
Grid2: Grid lines which cross axis 2, drawn using astGridLine or astGrid
Markers: Graphical markers (symbols) drawn using astMark
NumLab: Numerical axis labels drawn using astGrid
NumLab1: Numerical labels for axis 1 drawn using astGrid
NumLab2: Numerical labels for axis 2 drawn using astGrid
Strings: Text strings drawn using astText
TextLab: Descriptive axis labels drawn using astGrid
TextLab1: Descriptive label for axis 1 drawn using astGrid
TextLab2: Descriptive label for axis 2 drawn using astGrid
Ticks: Tick marks (both major and minor) drawn using astGrid
Ticks1: Tick marks (both major and minor) for axis 1 drawn using astGrid
Ticks2: Tick marks (both major and minor) for axis 2 drawn using astGrid
Title: The Plot title drawn using astGrid