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Added Zoomlevel

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commit d0c55c16f7400d1db5b534d5e228ec9280d4eb1c 1 parent 1a6cc27
@johndpope authored
Showing with 68 additions and 0 deletions.
  1. +1 −0  MKMapView+ZoomLevel.h
  2. +16 −0 MKMapView+ZoomLevel.m
  3. +51 −0 README.markdown
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1  MKMapView+ZoomLevel.h
@@ -6,5 +6,6 @@
- (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
zoomLevel:(NSUInteger)zoomLevel
animated:(BOOL)animated;
+- (NSUInteger) zoomLevel;
@end
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16 MKMapView+ZoomLevel.m
@@ -86,4 +86,20 @@ - (void)setCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
[self setRegion:region animated:animated];
}
+
+- (NSUInteger) zoomLevel {
+ MKCoordinateRegion region = self.region;
+
+ double centerPixelX = [self longitudeToPixelSpaceX: region.center.longitude];
+ double topLeftPixelX = [self longitudeToPixelSpaceX: region.center.longitude - region.span.longitudeDelta / 2];
+
+ double scaledMapWidth = (centerPixelX - topLeftPixelX) * 2;
+ CGSize mapSizeInPixels = self.bounds.size;
+ double zoomScale = scaledMapWidth / mapSizeInPixels.width;
+ double zoomExponent = log(zoomScale) / log(2);
+ double zoomLevel = 20 - zoomExponent;
+
+ return zoomLevel;
+}
+
@end
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51 README.markdown
@@ -0,0 +1,51 @@
+# About MKMapView category
+The included MKMapView category for supporting zoom level, code belongs to Troy Brant
+http://troybrant.net/blog/2010/01/mkmapview-and-zoom-levels-a-visual-guide/
+
+If you have ever built a web application using the Google Maps API, you are likely intimately familiar with this line of code:
+
+map.setCenter(new google.maps.LatLng(37.4419, -122.1419), 13);
+
+
+
+# Example
+
+ MKCoordinateRegion region;
+ CLLocationCoordinate2D c;
+ c.latitude = 37.4419;
+ c.longitude = -122.1419;
+ region.center = c;
+ [mapView setCenterCoordinate:c zoomLevel:13 animated:YES];
+
+
+
+
+# Note
+
+
+
+# Questions
+http://troybrant.net/blog/2010/01/set-the-zoom-level-of-an-mkmapview/
+
+
+# License
+Copyright (c) 2010 Troy Brant
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
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