Then, to implement interaction, like clicking to select a building, you Objects/attributes to include in the view. YouĬould also use this display set to implement rapid UI selection of what Set of Racket structs/objects just for the ones being displayed.
Some reason, then you might want to also introduce a partial homomorphic If your GIS data set in Racket structs/objects is very large, and yourĪpplication adds significant data to the objects being displayed for Represent the GIS objects in Racket structs/objects, use a RacketĬanvas, and use the Racket vector drawing primitives to draw into theĬanvas while traversing the pertinent Racket GIS structs/objects (youĬan let the canvas and DC do the clipping and scaling). Want build an actual GIS or GIS-like program, rather than only usingĪt first glance, how I suspect you would probably want to do it is to Yes, one can implement a cross-platform GIS program in Racket. The bitmap idea of clicking on a spot - connecting spot with coordinates, then with other data - won't do. On the UI side, the objects should be "clickable," i.e., an actual object should be addressed. For example, if you use a square object to represent a building, then that object should persist as something real, to which various attributes can then be attached, furthermore, to be part of a graph database. It would have to do "vector graphics," which is to say every primitive drawing object is real, i.e., isn't just a setup step toward creating a raster bit map - to be thrown away afterwards.
I was wondering if Racket could be used to create a new sort of GIS app, i.e., geographic information system.
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