Click-Interactive Panels
Mathematica's symbolic representation of both graphics and controls makes it particularly easy to create click-interactive panels in which the user clicks or drags elements embedded in a fixed overall image.
Dynamic — set up dynamic variables and a dynamic overall display
LocatorPane — place one or more locators with arbitrary appearances on any image
Locator — set up a movable thumb connected to a dynamic variable
ClickPane — respond to the locations of clicks on any image, perhaps dynamic
Layout & Annotation
PlotRange — specify a fixed coordinate system
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