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GUI
2.7 Graphics Window
Figure 2.48: HDevelop’s graphics window.
• objects and
• display parameters
that have been displayed or changed since the most recent Clear or display of an image. This history
is used for redrawing the contents of the window. The history is limited to a maximum number of 30
“redraw actions”, where one redraw action contains all objects of one displayed variable.
Other output like text or general graphics like disp_line or disp_circle or iconic data that displayed
using HALCON operators like disp_image or disp_region are not part of the history, and are not
redrawn. Only the object classes image, region, and XLD that are displayed with the HDevelop operator
dev_display or by double clicking on an icon are part of the history.
You may change the size of the graphics window interactively by “gripping” the window border with the
mouse. Then you can resize the window by dragging the mouse pointer. After this size modification the
window content is redisplayed. Now you see the same part of the window with changed zoom.