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MapStructure Optimizations: Difference between revisions
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→Allocating selectable ranges into groups
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The scale option is implemented differently, and is worth more detailed discussion. There are two scales at work here: | The scale option is implemented differently, and is worth more detailed discussion. There are two scales at work here: | ||
# The Range, which is used to determine what is searched for | # The '''Range''', which is used to determine what is searched for | ||
# The Screen Range, which is effectively a resolution figure and closer to what we think of as scaling. | # The '''Screen Range''', which is effectively a resolution figure and closer to what we think of as scaling. | ||
The Airport dialog uses a fixed Range, and a variable Screen Range. This is because if we just use the Range, as we zoom in the airport center may fall outside the range, but the runways/taxiways/parking should still be visible. In contrast, the map-canvas currently uses a fixed ScreenRange of 200, and the zoom-in/out function changes the Range value.<ref>{{cite web | The Airport dialog uses a fixed Range, and a variable Screen Range. This is because if we just use the Range, as we zoom in the airport center may fall outside the range, but the runways/taxiways/parking should still be visible. In contrast, the map-canvas currently uses a fixed ScreenRange of 200, and the zoom-in/out function changes the Range value.<ref>{{cite web | ||