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5.4 Getting Help iconic output 33 semantic type data type control input file selection dialog Figure 5.3: Specifying parameters. • An operator call is added as the first line of the current program. • The IC is advanced, so that additional lines will be added after the inserted line. • The program line is executed and the PC is advanced. To be more precise: All the lines from the PC to the IC are executed which makes a difference when adding program lines in larger programs. • The character * is added to the window title to indicate unsaved changes in the current program. • The image is displayed in the graphics window. • The status bar is updated, i.e., the execution time of the operator read_image is displayed and the format of the loaded image is reported. • The output variable Clip is created and displayed in the variable window. 5.4 Getting Help You may be wondering where the clip image was loaded from since we did not specify any path or even a file extension. This is a detail that is related to the way the HALCON operator read_image works. HDevelop does not know anything about it. It just executes the operator with the parameters you supply. Nonetheless, it is easy to access the documentation of the operators from within HDevelop. Double-click the first program line in the program window. The operator is displayed in the operator window for editing. Now click Help to open the HDevelop online help window. It will automatically jump to the documentation of the displayed operator (see figure 5.4). The reference manual is completely cross-linked. The navigation at the left part of the window provides quick access to the documentation. The tab card Contents presents the hierarchical structure of the reference manual (plus access to other HALCON manuals). The tab card Operators lists all operators for direct access. Enter any desired substring into Filter to quickly find an operator. In the remainder of this chapter, try to use the online help as much as possible to get information about the used operators. The online help window is described in section 6.8 on page 127. Programming • The operator window is cleared and ready for the insertion of the next operator.
