/*

     File: HazardMap.h

 Abstract: MKOverlay model object representing a USGS earthquake hazard map.

 See http://earthquake.usgs.gov/hazards/products/conterminous/2008/data/. 

 This class demonstrates how to project latitude and longitude coordinates representing the corners

 of a square into an MKMapRect.

  Version: 1.2

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#import <MapKit/MapKit.h>

@interface HazardMap : NSObject <MKOverlay> {

    CLLocationCoordinate2D origin; // position of upper left hazard

    CLLocationDegrees gridSize; // delta degrees for each square in the grid

    int gridWidth;  // number of squares in the grid in the x direction

    int gridHeight; // "" y direction

    float *grid; // actual hazard values in row-major order

}

// path points to a USGS earthquake hazard map grid file converted to binary

// format by the compactgrid utility.

- (id)initWithHazardMapFile:(NSString *)path;

- (MKMapRect)boundingMapRect;

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;

// Sample the hazard values within rect into values.  Boundaries will contain

// the bounding map rects for each respective value in values.  Caller is

// responsible for freeing both values and boundaries.

- (void)hazardsInMapRect:(MKMapRect)rect

                 atScale:(MKZoomScale)scale

                  values:(float **)values

              boundaries:(MKMapRect **)boundaries

                   count:(int *)count;

@end