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also update on scale changes

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This commit is contained in:
Hannes Janetzek 2013-05-01 03:42:00 +02:00
parent 18fdbd07d7
commit c682ae518c
1 changed files with 7 additions and 5 deletions
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6
src/org/oscim/layers/overlay/MapScaleBar.java
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@ -71,6 +71,7 @@ public class MapScaleBar extends Layer {
private final Canvas mMapScaleCanvas; private final Canvas mMapScaleCanvas;
private boolean mRedrawNeeded; private boolean mRedrawNeeded;
private double mPrevLatitude = -1; private double mPrevLatitude = -1;
private final double mPrevScale = -1;
private final Map<TextField, String> mTextFields; private final Map<TextField, String> mTextFields;
/* private */final Bitmap mMapScaleBitmap; /* private */final Bitmap mMapScaleBitmap;
@ -125,16 +126,18 @@ public class MapScaleBar extends Layer {
}; };
} }
@Override @Override
public void onUpdate(MapPosition mapPosition, boolean changed) { public void onUpdate(MapPosition mapPosition, boolean changed) {
double latitude = MercatorProjection.toLatitude(mapPosition.y); double latitude = MercatorProjection.toLatitude(mapPosition.y);
if (!mRedrawNeeded) { if (!mRedrawNeeded) {
double scaleDiff = mPrevScale / mapPosition.scale;
if (scaleDiff < 1.1 && scaleDiff > 0.9) {
double latitudeDiff = Math.abs(mPrevLatitude - latitude); double latitudeDiff = Math.abs(mPrevLatitude - latitude);
if (latitudeDiff < LATITUDE_REDRAW_THRESHOLD) if (latitudeDiff < LATITUDE_REDRAW_THRESHOLD)
return; return;
} }
}
mPrevLatitude = latitude; mPrevLatitude = latitude;
double groundResolution = MercatorProjection.calculateGroundResolution( double groundResolution = MercatorProjection.calculateGroundResolution(
@ -166,7 +169,6 @@ public class MapScaleBar extends Layer {
mRedrawNeeded = false; mRedrawNeeded = false;
} }
/** /**
* @return true if imperial units are used, false otherwise. * @return true if imperial units are used, false otherwise.
*/ */