iphone多边形显示数

Posted 2023-04-02

参考技术A 我正在尝试在ArcGIS地图上绘制多边形对象，但这些对象没有以正确的形状和正确的位置显示/绘制。在苹果地图上，多边形绘制为正方形，但在ArcGIS iPhone地图上，多边形显示为“无限线条”。我已附加了ArcGIS地图和苹果地图的输出

我的代码

- (void)viewDidLoad

[super viewDidLoad];

NSURL* url = [NSURLURLWithString:@"https://gis.zoetermeer.nl/arcgis/rest/services/Public/GBKZ_Prod/MapServer/"];
AGSTiledMapServiceLayer *tiledLayer = [AGSTiledMapServiceLayer tiledMapServiceLayerWithURL:url];
tiledLayer.delegate = self;
[self.mapView addMapLayer:tiledLayer withName:@"Basemap Tiled Layer"];


- (void)layerDidLoad: (AGSLayer*) layer

NSLog(@"Layer added successfully");

AGSGraphicsLayer* myGraphicsLayer = [AGSGraphicsLayer graphicsLayer];
[self.mapView addMapLayer:myGraphicsLayer withName:@"Graphics Layer"];
NSLog(@"%i",myGraphicsLayer.spatialReferenceStatusValid);

AGSSpatialReference *specailRefference = [AGSSpatialReference spatialReferenceWithWKID: 28992];

NSString *coordinateString = @"4.4998839821275 52.066336122032, 4.499855 52.066286, 4.499792 52.066176, 4.499696 52.066014, 4.499631 52.066002, 4.499611 52.065966, 4.499604 52.065862, 4.499448 52.065609, 4.499412 52.065552, 4.499407 52.065543, 4.499399 52.065536, 4.499389 52.065529, 4.499378 52.065524, 4.4993733686962 52.065522931238, 4.4993733686962 52.066336122032";

NSString *coordinateString2 = @"4.4991002778594 52.065436800426, 4.499085 52.065422, 4.499100 52.065386, 4.499177 52.065316, 4.499370 52.065273, 4.499362 52.065259, 4.499053 52.065327, 4.498905 52.065360, 4.498794 52.065385, 4.498657 52.065415, 4.498647 52.065418, 4.498638 52.065423, 4.498632 52.065429, 4.498629 52.065436, 4.498629 52.065436800426";

NSString *coordinateString3 = @"4.4993733686962 52.075329338091, 4.5008878063918 52.075329338091, 4.5008878063918 52.074430016486, 4.4993733686962 52.074430016486";

AGSMutablePolygon *polyGon1 = [self getpolygon:coordinateString];
AGSMutablePolygon *polyGon2 = [self getpolygon:coordinateString2];
AGSMutablePolygon *polyGon3 = [self getpolygon:coordinateString3];
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(52.066002,4.499631);

AGSPoint* gpsPoint = [[AGSPoint alloc] initWithX:coordinate.longitude
y:coordinate.latitude spatialReference:[AGSSpatialReference wgs84SpatialReference]];

AGSGeometryEngine* engine = [AGSGeometryEngine defaultGeometryEngine];

AGSPoint* mapPoint = (AGSPoint*) [engine projectGeometry:gpsPoint toSpatialReference:specailRefference];

[self.mapView zoomToGeometry:mapPoint withPadding:100 animated:YES];

AGSGraphic *graphic1 = [[AGSGraphic alloc] initWithGeometry:polyGon1 symbol:[self barrierSymbol] attributes:nil];
[myGraphicsLayer addGraphic:graphic1];

AGSGraphic *graphic2 = [[AGSGraphic alloc] initWithGeometry:polyGon2 symbol:[self barrierSymbol] attributes:nil];
[myGraphicsLayer addGraphic:graphic2];

AGSGraphic *graphic3 = [[AGSGraphic alloc] initWithGeometry:polyGon3 symbol:[self barrierSymbol] attributes:nil];
[myGraphicsLayer addGraphic:graphic3];


- (AGSCompositeSymbol*)barrierSymbol

AGSCompositeSymbol *cs = [AGSCompositeSymbol compositeSymbol];
AGSSimpleLineSymbol *sls = [AGSSimpleLineSymbol simpleLineSymbol];

sls.color = [UIColor greenColor];
sls.style = AGSSimpleLineSymbolStyleSolid;
sls.width = 20;

AGSSimpleFillSymbol *sfs = [AGSSimpleFillSymbol simpleFillSymbol];
sfs.outline = sls;
sfs.style = AGSSimpleFillSymbolStyleHorizontal;
sfs.color = [UIColor darkTextColor];
[cs addSymbol:sfs];

return cs;


- (AGSMutablePolygon*)getpolygon:(NSString*)coordinateString

AGSSpatialReference *specailRefference = [AGSSpatialReference spatialReferenceWithWKID: 28992];

AGSMutablePolygon *polyGon = [[AGSMutablePolygon alloc] initWithSpatialReference:specailRefference];

[polyGon addRingToPolygon];

NSArray *tokens = [coordinateString componentsSeparatedByString:@","];

for (int k=0; k<[tokens count]; k++)
NSString *latlong = [tokens objectAtIndex:k];
NSArray *latlongArray = [latlong componentsSeparatedByString:@" "];

NSString *longi = [latlongArray objectAtIndex:0];
double longVal = [longi doubleValue];

NSString *lati = [latlongArray objectAtIndex:1];
double latVal = [lati doubleValue];

CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latVal, longVal);

AGSPoint* gpsPoint = [[AGSPoint alloc] initWithX:coordinate.longitude y:coordinate.latitude spatialReference:[AGSSpatialReference wgs84SpatialReference]];

AGSGeometryEngine* engine = [AGSGeometryEngine defaultGeometryEngine];
AGSPoint* mapPoint = (AGSPoint*) [engine projectGeometry:gpsPoint toSpatialReference:specailRefference];

[polyGon addPointToRing:mapPoint];


return polyGon;


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请指导我如何正确地在ArcGIS地图上绘制多边形。谢谢！！

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以二进制表示的交叉数/绕组数多边形测试（Python）

【中文标题】以二进制表示的交叉数/绕组数多边形测试（Python）

【英文标题】：Crossing number/Winding number polygon test expressed as binary (Python)

【发布时间】：2015-06-21 14:24:38

【问题描述】：

我正在尝试实现绕组数或交叉数测试，主要围绕布尔运算构建。 布尔值的要求是由于底层数据集的方法和效率，使得将变量委托给除布尔值以外的计数是次优的。

交叉数似乎最容易实现（我认为），因为它本质上是二进制的（偶数 (0) 与奇数 (1)），其中每一侧的交叉数测试的结果可以是 xor-ed使用前面的结果，例如下面给出的代码，其中xyz 是我们评估的坐标。代码最后改编自http://geomalgorithms.com/a03-_inclusion.html。

#Original points:
pts=[[100,100],[200,200],[300,100],[400,300],[300,400],[200,300],[100,100]]

#Extremas:
min=[pts[0][0],pts[0][1]]
max=[pts[0][0],pts[0][1]]

for i in pts:
  for j in range(2):
    if i[j]<min[j]:
      min[j]=i[j]
    if i[j]>max[j]:
      max[j]=i[j]

#New dimensions:
w=max[0]-min[0]
h=max[1]-min[1]
if len(sys.argv) > 2:
  xyz=[int(sys.argv[1]),int(sys.argv[2])]
else:
  xyz=[200,100]

#Normalize by cutting off lower than minimum, higher than maximum:
for i,p in enumerate(pts):
  pts[i]=[p[0]-min[0],p[1]-min[1]]

x=0
y=1
logic=None
counting=0
for i in range(len(pts)-1):
  test=(  ( (pts[i][y] <= xyz[y]) and (pts[i+1][y] > xyz[y]) ) or \
           ( (pts[i][y] > xyz[y]) and (pts[i+1][y] <= xyz[y]) ) ) and \
             (xyz[x] < pts[i][x] + ( (xyz[y]-pts[i][y])/(pts[i+1][y]-pts[i][y]) ) * (pts[i+1][x] - pts[i][x]))
  if logic is None:
    logic=test
  else:
    logic^=test
  if test:
    counting+=1
print logic
print counting

结果： 对于整个图像，二进制流会导致这些图像中的每个正方形都是一个步骤。 显然有些不对劲，但我似乎无法弄清楚为什么它在绕过右下角后变得混乱......有什么想法吗？

【参考方案1】：

啊哈！

&!==and 和 |!==or。通过更改操作符，它起作用了。