Plot

Objects of the IDLgrPlot class are individual plot lines, created from a user-supplied vector of dependent data values (and, optionally, a vector of independent data values). Plots do not automatically include axes. A plot display may include the following objects:

Axis: IDLgrAxis objects show data ranges (one object required for each axis to be rendered)

Legend: IDLgrLegend objects annotate individual data items or lines in a visualization.

Colorbar: IDLgrColorbar objects annotate the data values associated with colors used in a visualization.

Symbol: IDLgrSymbol objects define a graphical element that can be used when plotting data.

Contour

Objects of the IDLgrContour class are lines representing contour information plotted from user data. Contour displays, like plot displays, may also include legend, colorbar, or symbol objects. You can also use the following:

Pattern: IDLgrPattern objects defines which pixels are filled and which are left blank when a graphic object is filled. Patterns can be applied to successive contour levels.

Image

Objects of the IDLgrImage class are two-dimensional arrays of data with an associated mapping of the data values to pixel values. Displays containing image objects my also include:

Palette: IDLgrPalette objects define a color lookup table that maps indices to red, green, and blue values.

ROI: IDLgrROI objects are representations of a region of interest. Regions of interest are described as a set of vertices that may be connected to generate a path or a polygon, or may be treated as separate points. Objects of the IDLgrROIGroup class are representations of a group of regions of interest.

Surface

Objects of the IDLgrSurface class are individual three-dimensional surfaces, created from a user-supplied array of data values.

Light: IDLgrLight objects are light sources that illuminate visualization objects. Light objects are not actually rendered, but must be contained in a model object so that they can be positioned and transformed along with the graphic objects they illuminate. If no light object is included in a particular view, default lighting is supplied.

Volume

Objects of the IDLgrVolume class map a three-dimensional array of data values to a three-dimensional array of voxel colors, which, when drawn, are projected to two dimensions. Volume displays, like surface displays, can also include lights.

Polygon and Polyline

Polygons and polylines are low-level graphic objects that can be displayed by themselves or with other objects.

Objects of the IDLgrPolygon class are individual polygons, created from a user-supplied array of data values.

Tessellator: IDLgrTessellator objects convert a simple concave polygon (or a simple polygon with holes) into a number of simple convex polygons (general triangles). Tessellation is useful because IDL’s polygon object accepts only convex polygons.

Objects of the IDLgrPolyline class are individual polylines created from a user-supplied array of data points. Locations of the data points supplied are connected by a single line.

Text

Objects of the IDLgrText class are text strings that can be positioned within the rendering area.

Font: IDLgrFont objects define the typeface, size, weight, and style of a text object with which it is associated.

Text objects are applicable to any of the previous displays.