如何插入数组值以基于长/纬度值绘制多边形 - Google Maps iOS？ [英] How to insert array values to draw polygon based on long/lat values - Google Maps iOS?

问题描述

我正在尝试GMSPolygon * polygon = [GMSPolygon polygonWithPath：rect];方法来绘制用户所点击的坐标的多边形。下面是我如何存储点击的坐标：

  //数组由单击的坐标构成
 NSMutableArray * latitudeTappedCoordinates = [NSMutableArray array ]。 
 NSMutableArray * longitudeTappedCoordinates = [NSMutableArray array]; 
 NSUInteger numberOfLongitudeCoordinates = [longitudeTappedCoordinates count]; 
 NSUInteger numberOfLatitudeCoordinates = [latitudeTappedCoordinates count]; 
 for（int i = 2; i< numberOfLatitudeCoordinates; i ++）{
 [latitudeTappedCoordinates addObject：[NSNumber numberWithInt：coordinate.latitude]]; 
} 
 for（int i = 2; i< numberOfLongitudeCoordinates; i ++）{
 [longitudeTappedCoordinates addObject：[NSNumber numberWithInt：coordinate.longitude]]; 
} 
  

在此之后，我有以下内容：

  // polygon 
 GMSMutablePath * rect = [GMSMutablePath path]; 
 [rect addCoordinate：CLLocationCoordinate2DMake（coordinate.latitude，coordinate.longitude）]; 
 GMSPolygon * polygon = [GMSPolygon polygonWithPath：rect]; 
  

正如您所看到的，

  [rect addCoordinate：CLLocationCoordinate2DMake（coordinate.latitude，coordinate.longitude）]; 
  

只需要一个属性。我希望它能够获取上面的数组init中的所有值，因此可以绘制多边形。我该怎么做？

首先存储float值不是数组中的int值。 $ b然后

加入界面

  NSMutableArray * latitudeTappedCoordinates; 
 NSMutableArray * longitudeTappedCoordinates; 
  

您可以这样做：

  //创建一个矩形路径
 GMSMutablePath * rect = [GMSMutablePath path]; 
 CLLocationCoordinate2D事件; 
 
 for（int i = 0; i< = [longitudeTappedCoordinates count] -1; i ++）{
 event.latitude = [[latitudeTappedCoordinates objectAtIndex：i] floatValue]; 
 event.longitude = [[longitudeTappedCoordinates objectAtIndex：i] floatValue]; 
 [rect addCoordinate：event]; 
} 
 
 GMSPolygon * polygon = [GMSPolygon polygonWithPath：rect]; 
 polygon.fillColor = [UIColor colorWithRed：0.25 green：0 blue：0 alpha：0.05]; 
 polygon.strokeColor = [UIColor blackColor]; 
 polygon.strokeWidth = 2; 
 polygon.map = mapView; 
  

I am trying the GMSPolygon *polygon = [GMSPolygon polygonWithPath:rect]; method to draw a polygon of the tapped coordinates by the user. Here's how I store the clicked coordinates:

// array made of clicked coordinates
NSMutableArray *latitudeTappedCoordinates = [NSMutableArray array];
NSMutableArray *longitudeTappedCoordinates = [NSMutableArray array];
NSUInteger numberOfLongitudeCoordinates = [longitudeTappedCoordinates count];
NSUInteger numberOfLatitudeCoordinates = [latitudeTappedCoordinates count];
for (int i = 2; i < numberOfLatitudeCoordinates; i++) {
    [latitudeTappedCoordinates addObject:[NSNumber numberWithInt:coordinate.latitude]];
}
for (int i = 2; i < numberOfLongitudeCoordinates; i++) {
    [longitudeTappedCoordinates addObject:[NSNumber numberWithInt:coordinate.longitude]];
}

After this, I have the following:

// polygon
GMSMutablePath *rect = [GMSMutablePath path];
[rect addCoordinate:CLLocationCoordinate2DMake(coordinate.latitude,coordinate.longitude)];
GMSPolygon *polygon = [GMSPolygon polygonWithPath:rect];

As you can see, the line

[rect addCoordinate:CLLocationCoordinate2DMake(coordinate.latitude,coordinate.longitude)];

only takes in a single attribute. I want it to take in all the values in the arrays init above, so it can draw the polygon. How can I do that?

解决方案

First store float values not int values in array. then

Add in interface

 NSMutableArray *latitudeTappedCoordinates;
 NSMutableArray *longitudeTappedCoordinates;

You can do like this :

// Create a rectangular path
GMSMutablePath *rect = [GMSMutablePath path];
CLLocationCoordinate2D event;

for (int i = 0; i <= [longitudeTappedCoordinates count]-1; i++) {
    event.latitude = [[latitudeTappedCoordinates objectAtIndex:i] floatValue];
    event.longitude = [[longitudeTappedCoordinates objectAtIndex:i] floatValue];
    [rect addCoordinate:event];
}

GMSPolygon *polygon = [GMSPolygon polygonWithPath:rect];
polygon.fillColor = [UIColor colorWithRed:0.25 green:0 blue:0 alpha:0.05];
polygon.strokeColor = [UIColor blackColor];
polygon.strokeWidth = 2;
polygon.map = mapView;

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