![]() ![]() #Idl color table windowsAnother point improving the clarity of the user interface is to reduce the number of open windows and avoid overlapping windows so far as possible. Optionally, Dolt buttons can be “snapped” to an “on” position, thus facilitating automatic updates. In this way it is possible, for example, to first adjust the threshold of an isosurface module or to first select the color map of a volume rendering module before starting any computation. Modules that may need more time for preprocessing usually provide an additional Dolt button, which must be pressed in order to generate a result. In many cases one simply chooses a module from a data object's pop-up menu and immediately receives a visual result. In amira all of this is done by a single OrthoSlice module.īy default, visualization modules show their results directly in the main graphics window. ![]() For example, in order to display one slice of a 3D image in a data-flow-oriented visualization system, users must often first extract a 2D sub-image, then convert this into geometry data, and finally display the geometry using a render module. ![]() Next, fewer but more powerful modules are preferred, compared to a larger number of simpler entities. First, context-sensitive pop-up menus are provided, offering only those modules that actually can be connected to a given data object. We try to accomplish this goal using several different strategies. Of course, this is a somewhat subjective and loosely defined requirement. HANS-CHRISTIAN HEGE, in Visualization Handbook, 2005 38.2.3 User-Interface Issues and 3D InteractionĪ primary design goal of amira is ease of use. For example, to create a white plot on a blue background.ĭETLEV STALLING. To set the background to a specific color when the PostScript device is selected, you can call the polyfill procedure to fill the drawable area with the selected color. You can use a specific color table index for the plotting color by passing the color keyword to the relevant IDL plotting command (e.g., plot, surface). However, when creating PostScript output, you probably don't want a black background, so IDL does not set a background color, and the default plotting color is set to the lowest index in the color table (which is usually black). Most of the predefined color tables in IDL have black at the lowest color table entry and white at the highest color table entry. By default, IDL uses a black background color and a white drawing color in graphics windows, corresponding to the lowest and highest entries in the color table. You may have noticed that the default background and drawing colors in PostScript mode are the reverse of what you see in a graphics window. GUMLEY, in Practical IDL Programming, 2002 Reversed Background and Drawing Colors ![]()
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