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Direct Graphics

ANNOTATE - Starts IDL widget used to interactively annotate images and plots with text and drawings.

ARROW - Draws line with an arrow head.

AXIS - Draws an axis of the specified type and scale at a given position.

BAR_PLOT - Creates a bar graph.

BOX_CURSOR - Emulates operation of a variable-sized box cursor.

CONVERT_COORD - Transforms coordinates to and from the coordinate systems supported by IDL.

CONTOUR - Draws a contour plot.

CREATE_VIEW - Sets the various system variables required to define a coordinate system and a 3-D view.

CURSOR - Reads position of the interactive graphics cursor.

CVTTOBM - Creates a bitmap byte array for a button label.

DEFROI - Defines an irregular region of interest of an image using the image display system and the cursor and mouse.

DEVICE - Sets to plot in device coordinates.

DRAW_ROI - Draws a region or group of regions to the current Direct Graphics device.

EMPTY - Empties the graphics output buffer.

ERASE - Erases the screen of the current graphics device, or starts a new page if the device is a printer.

ERRPLOT - Plots error bars over a previously drawn plot.

FLICK - Causes the display to flicker between two output images at a given rate.

FORMAT_AXIS_VALUES - Formats numbers as strings for use as axis values.

IMAGE_CONT - Overlays an image with a contour plot.

LABEL_REGION - Consecutively labels all of the regions, or blobs, of a bi-level image with a unique region index.

LOADCT - Loads a pre-defined color table.

OPLOT - Plots vector data over a previously drawn plot.

OPLOTERR - Plots error bars over a previously drawn plot.

PLOT - Draws a graph of vector arguments.

PLOT_3DBOX - Plots a function of two variables (e.g., Z=f(X, Y)) inside a 3-D box.

PLOT_FIELD - Plots a 2-D field. N random points are picked, and from each point a path is traced along the field.

PLOTERR - plots individual data points with error bars.

PLOTS - Plots vectors and points.

POLAR_CONTOUR - Draws a contour plot from data in polar coordinates.

POLAR_SURFACE - Interpolates a surface from polar coordinates (R, Theta, Z) to rectangular coordinates (X, Y, Z).

POLYFILL - Fills the interior of a polygon.

POLYSHADE - Creates a shaded-surface representation of one or more solids described by a set of polygons.

PROFILE - Extracts a profile from an image.

PROFILES - Interactively examines image profiles.

PROJECT_VOL - Returns a two-dimensional image that is the projection of a 3-D volume of data onto a plane (similar to an X-ray).

RDPIX - Interactively displays the X position, Y position, and pixel value at the cursor.

SCALE3 - Sets up transformation and scaling parameters for basic 3-D viewing.

SCALE3D - Scales the 3-D unit cube (a cube with the length of each side equal to 1) into the viewing area.

SET_PLOT - Sets the output device used by the IDL direct graphics procedures.

SET_SHADING - Modifies the light source shading parameters that affect the output of SHADE_SURF and POLYSHADE.

SHADE_SURF - Creates a shaded-surface representation of a regular or nearly-regular gridded surface.

SHADE_SURF_IRR - Creates a shaded-surface representation of an irregularly gridded elevation dataset. Given a 3-D volume and a contour value, SHADE_VOLUME produces a list of vertices and polygons describing the contour surface.

SHADE_VOLUME - Given a 3-D volume and a contour value, produces a list of vertices and polygons describing the contour surface.

SHOW3 - Combines an image, a surface plot of the image data, and a contour plot of the images data in a single tri-level display.

SURFACE - draws a wire-mesh representation of a two-dimensional array projected into two dimensions, with hidden lines removed.

THREED - Plots a 2D array as a pseudo 3D plot.

TV - Displays an image.

TVCRS - Manipulates the image display cursor.

TVLCT - Loads a predefined color table or a color table from specified variables.

TVRD - Returns the contents of the specified rectangular portion of the current graphics window or device.

TVSCL - Scales and displays an image.

WINDOW - Creates a window for the display of graphics or text.

WSET - Selects the current window.

WSHOW - Exposes or hides the designated window.

XYOUTS - Draws text on currently-selected graphics device.

ZOOM - Zooms portions of the display.

ZOOM_24 - Zooms portions of true-color (24-bit) display.

  IDL Online Help (March 06, 2007)