The LIVE_CONTOUR procedure displays contour visualizations in an interactive environment. Because the interactive environment requires extra system resources, this routine is most suitable for relatively small data sets. If you find that performance does not meet your expectations, consider using the Direct Graphics CONTOUR routine or the Object Graphics IDLgrContour class directly.
After LIVE_CONTOUR has been executed, you can double-click on a contour line to display a properties dialog. A set of buttons in the upper left corner of the window allows you to print, undo the last operation, redo the last "undone" operation, copy, draw a line, draw a rectangle, or add text.
LIVE_CONTOUR is actually a subset of the IDL Insight application. If you find that the LIVE_CONTOUR graphical user interface does not provide the level of control you need, consider using Insight itself. You can start the Insight application by entering
at the IDL command prompt.
You can control your LIVE window after it is created using any of several auxiliary routines. See LIVE_Tools for an explanation.
Set this keyword to bypass the creation of a LIVE window and send the visualization to an offscreen buffer. The WINDOW field of the reference structure returned by the REFERENCE_OUT keyword will contain the name of the buffer.
Set this keyword to 1 to instance drawing on, or 0 to turn it off. The default (-1) is to use instancing if and only if the "software renderer" is being used (see RENDERER). For more information, see Hardware vs. Software Rendering in See Destination Objects the Objects and Object Graphics manual.
Set this keyword to a two-element, floating-point vector of the form [X, Y] specifying the location of the visualization (relative to the lower left hand corner within the visualization window) in normalized coordinates. The default is [0.0, 0.0].
Set this keyword to a structure containing suggested names for the data items to be created for this visualization. See the REPLACE keyword for details on how they will be used. The fields of the structure are as follows. (Any or all of the tags may be set.)
The default for a field is to use the given variable name. If the variable does not have a name (i.e., is an expression), a default name is automatically generated. The dependent data names will be used in a round-robin fashion if more data than names are input.
Set this keyword to inhibit the visualization window from drawing results of LIVE_CONTOUR. This is useful if multiple visualizations and/or annotations are being created via calls to other LIVE_Tools in order to reduce unwanted draws and help speed the display.
NOTE: The location of the draw widget is not settable. It is expected that the user who wishes to insert a tool into their own widget application will determine the setting from the parent base sent to the tool.
Set this keyword to 1 to use the "software renderer", or 0 to use the `hardware renderer". The default (-1) is to use the setting in the IDE (IDL Development Environment) preferences; if the IDE is not running, however, the default is hardware rendering. For more information, see Hardware vs. Software Rendering in See Destination Objects the Objects and Object Graphics manual.
Set this keyword to a structure containing tags as listed for the NAME keyword, with scalar values corresponding to the replacement options listed below. (Any or all of the tags may be set.) The replacement settings are used to determine what action to take when an item (such as data) being input would have the same name as one already existing in the given window or buffer (WINDOW_IN).
Default. Option 0 will be used for items that do not have names (e.g., data input as an expression rather than a named variable, with no name provided via the NAME keyword). Option 3 will be used for all named items.
Set this keyword to either a string specifying a style name (or a style in the Insight template project), or to a style reference created from LIVE_STYLE .
Set this keyword to a two-element vector of the form [ Xoffset , Yoffset ] specifying the offset (in pixels) of the LIVE window from the upper left corner of the screen. This keyword has no effect if the PARENT_BASE keyword is set. The default is [0, 0].
Set this keyword equal to a name (string, case-sensitive) of a LIVE tool or Insight window, or a LIVE tool buffer, in which to display the visualization. The WINDOW tag of the REFERENCE_OUT structure from the creation of the LIVE tool will provide the window or buffer name. Window names are also visible in visualization window titlebars. The default is to create a new window.
The first plot will update to use the Y of the second plot when the second plot is drawn. If the user wants to display 2 "tweaks" of the same data, a different variable name must be used each time, or at least one should be an expression (thus not a named variable). For example:
CONTOUR , Using IDL Insight