AGSDynamicLayer(ForSubclassEyesOnly) Category Reference

Description

This category organizes the methods that are relevant to subclassing a dynamic layer. Developer can create custom dynamic layers by paying special attention to the methods in this category when subclassing AGSDynamicLayer.

Sub-classes must provide valid values for AGSLayer::spatialReference, AGSLayer::fullEnvelope, and AGSLayer::initialEnvelope properties. Other properties on AGSLayer are optional.

Since
10.1.1 

See also

    AGSLayer(ForSubclassEyesOnly) 

Instance Methods

(void)     - requestImageWithWidth:height:envelope:timeExtent:

(void)     - setImageData:forEnvelope:

Properties

NSOperationQueue *     queue

BOOL     wrapAroundSupported

#import "CustomDynamicLayer.h"

@interface CustomDynamicLayer ()

@property (nonatomic, strong, readwrite) AGSEnvelope *fullEnvelope;

@property (nonatomic, strong, readwrite) AGSSpatialReference *spatialReference;

@end

@implementation CustomDynamicLayer

@synthesize fullEnvelope = _fullEnvelope;

@synthesize spatialReference = _spatialReference;

#pragma mark - Init Methods

- (id)initWithFullEnvelope:(AGSEnvelope*)fullEnvelope {

    self = [super init];

    if (self) {

        _spatialReference = fullEnvelope.spatialReference;

        _fullEnvelope = fullEnvelope;

        [self layerDidLoad];

    }

    return self;

}

#pragma mark - Request Image

-(void)requestImageWithWidth:(NSInteger)width height:(NSInteger)height envelope:(AGSEnvelope*)env timeExtent:(AGSTimeExtent*)timeExtent {

    // get an image，实际项目中有NameID,URL等形式来表达UIImage，
    // 如UIImage* img = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imgUrl]]];

    UIImage *img = [UIImage imageNamed:@"esri_campus"];

    // if request envelope instersect with full envelope

    // of layer then only set image data

    if ([env intersectsWithEnvelope:self.fullEnvelope]) {

        [self setImageData:UIImagePNGRepresentation(img) forEnvelope:self.fullEnvelope];

    }

    else {

        [self setImageData:nil forEnvelope:self.fullEnvelope];

    }

}

@end

#import "CustomDynamicLayer.h"

@class AGSLayers;

@implementation CustomDynamicLayer

@synthesize URL=_URL,imageId=_imageId,envelope=_envelope;

#pragma mark - Init

- (id)initWithURL:(NSURL*)url imageId:(NSString*)imageId envelope:(AGSEnvelope*)envelope {

    if (self = [self init]) {

        self.URL = url;

        self.imageId = imageId;

        self.envelope = _envelope;

        _loaded = YES;

    }

    return self;

}

#pragma mark - 

- (AGSUnits)units {

    return AGSUnitsUnknown;

}

- (AGSSpatialReference*) spatialReference {

    return self.envelope.spatialReference;

}

- (AGSEnvelope*)fullEnvelope {

    return self.envelope;

}

- (AGSEnvelope*)initialEnvelope {

    return self.envelope;

}

#pragma mark AGSDynamicLayer

- (void)imageRequestOperation:(NSOperation<AGSDynamicLayerDrawingOperation>*)op didGetImage:(UIImage *)image {

    NSLog(@"image: %@",image);

    [self.exportDelegate dynamicLayer:self exportMapImageOperation:op didFinishWithImage:image];

}

- (void)imageRequestOperation:(NSOperation<AGSDynamicLayerDrawingOperation>*)op didFailWithError:(NSError *)error {

    NSLog(@"Error: %@",error);

    if ([self.exportDelegate respondsToSelector:@selector(dynamicLayer:exportMapImageOperation:didFailWithError:)]) {

        [self.exportDelegate dynamicLayer:self exportMapImageOperation:op didFailWithError:error];

    }

}

-(NSOperation<AGSDynamicLayerDrawingOperation>*)exportMapImage:(AGSExportImageParams*)exportImageParams {

    if (exportImageParams.envelope == nil || CGSizeEqualToSize(CGSizeZero, exportImageParams.size)) {

        return nil;

    }

    NSMutableDictionary *exportParams = [NSMutableDictionary dictionaryWithObjectsAndKeys:

                                         @"png", @"type",

                                         self.imageId, @"id",

                                         nil];

    AGSDynamicLayerImageRequestOperation *operation = [[AGSDynamicLayerImageRequestOperation alloc] initWithURL:self.URL

                                                                                                  resource:@""                                                                                     queryParameters:exportParams];

    operation.target = self;

    operation.action = @selector(imageRequestOperation:didGetImage:);

    operation.errorAction = @selector(imageRequestOperation:didFailWithError:);

    operation.exportImageParams = exportImageParams;

    [[AGSRequestOperation sharedOperationQueue] addOperation:operation];

    return [operation autorelease];

}

#pragma mark - dealloc

-(void)dealloc{

    self.URL = nil;

    self.imageId = nil;

    self.envelope = nil;

    [super dealloc];

}

@end