Changeset 3620 in osm

Timestamp:

2007-07-19T02:05:17+02:00 (18 years ago)

Author:

ulf

Message:

slightly improve the map scale calculation

File:

• applications/editors/josm/plugins/mappaint/src/mappaint/MapPaintVisitor.java (modified) (2 diffs)

applications/editors/josm/plugins/mappaint/src/mappaint/MapPaintVisitor.java

@@ -37 +37 @@
                         return true;
                 }
-                        
+                                        
                 if(e == null) {
                         /* the default for things that don't have a rule (show, if scale is smaller than 1500m) */
@@ -47 +47 @@
                 }
                 
-                if(circum>=e.getMaxScale() / 70 || circum<e.getMinScale() / 70) {
+                // formular to calculate a map scale: natural size / map size = scale
+                // example: 876000mm (876m as displayed) / 22mm (roughly estimated screen size of legend bar) = 39818
+                //
+                // so the exact "correcting value" below depends only on the screen size and resolution
+                // XXX - do we need a Preference setting for this (if things vary widely)?
+                System.out.println("Circum: " + circum + " max: " + e.getMaxScale() + " min:" + e.getMinScale());
+                if(circum>=e.getMaxScale() / 22 || circum<e.getMinScale() / 22) {
                         return false;
                 } else {