Autodesk 15606-011408-9320 User Guide - Page 157

Online Help Index display ranges Specifying Display Ranges for Layer Styles You use the Display Ranges area on the Styles tab to specify the visible display range for the current style set. The other options on the Styles tab determine how the layer displays in the map window when the map's zoom level is within the display range currently shown in the Display Ranges box. When the current zoom level of Autodesk MapGuide Author or Autodesk MapGuide Viewer is within the visible display range of a particular layer, the program redraws that layer as specified in the associated style set. Most map layers have only one style set, but multiple style sets can be useful for some polyline map layers. In the table below, three different display ranges, each with its own set of styles, are set up to display major roads. Using these ranges and styles, Autodesk MapGuide Author draws the roads with heavier line styles as the zoom increases. Display Range 0 - 20,000 20,000 - 50,000 50,000 - 100,000 Styles Used To Draw the Road When setting up multiple style sets for a layer, make sure that the display ranges do not conflict. For example, the ranges 500,000 - 5,000,000 and 2,000,000 - 10,000,000 conflict, because the second range overlaps the first one. In such cases, when the current map scale is within the overlapping display range, Autodesk MapGuide Author displays the features using the styles of the first style set in the list only. Keep in mind that the style set will be used if the current map scale is greater than the From value and less than or equal to the To value. For example, if the display range is 0 - 20,000, the style set will be used if the current map scale is between 1 and 20,000. Therefore, when setting up adjacent display ranges, you should use the same From value as the previous style set's To value. Do not set one range to 0 - 20,000 and then set the next range to start at 20,001. Setting Style Properties for Layers | 157