Point Annotation Anchors

Point annotation anchors test

import React from 'react';
import Mapbox from '@rnmapbox/maps';
import { StyleSheet, Text, View } from 'react-native';

const ANNOTATION_SIZE = 50;

const defaultCamera = {
  centerCoordinate: [-73.98004319979121, 40.75272669831773],
  zoomLevel: 17,
};

const corners = [
  {
    coordinate: [-73.980313714175, 40.75279456928388],
    anchor: { x: 0, y: 1 },
  },
  {
    coordinate: [-73.9803415496257, 40.75275624885313],
    anchor: { x: 0, y: 0 },
  },
  {
    coordinate: [-73.98048535932631, 40.752816154647235],
    anchor: { x: 1, y: 0 },
  },
  {
    coordinate: [-73.98045541426053, 40.75285444197175],
    anchor: { x: 1, y: 1 },
  },
];

const sides = [
  {
    coordinate: [-73.97952569308393, 40.75274356459241],
    anchor: { x: 1 / 3, y: 0 },
  },
  {
    coordinate: [-73.98082017858928, 40.75329086324669],
    anchor: { x: 1 / 3, y: 1 },
  },
  {
    coordinate: [-73.97985980165191, 40.752286242917535],
    anchor: { x: 0, y: 1 / 3 },
    containerStyle: { flexDirection: 'row' },
  },
];

const styles = {
  small: {
    backgroundColor: 'blue',
    height: ANNOTATION_SIZE,
    justifyContent: 'center',
    width: ANNOTATION_SIZE,
    flex: 1,
  },
  large: {
    borderColor: 'blue',
    backgroundColor: 'transparent',
    borderWidth: StyleSheet.hairlineWidth,
    height: ANNOTATION_SIZE * 2,
    justifyContent: 'center',
    width: ANNOTATION_SIZE * 2,
    flex: 1,
  },
  text: {
    position: 'absolute',
    fontSize: 10,
  },
  matchParent: {
    flex: 1,
  },
};

const PointAnnotationAnchors = (props) => {
  return (
    <Mapbox.MapView style={styles.matchParent}>
      <Mapbox.Camera defaultSettings={defaultCamera} />
      {corners.map((p, i) => (
        <Mapbox.PointAnnotation
          key={`square-${i}`}
          id={`square-${i}`}
          coordinate={p.coordinate}
          anchor={p.anchor}
        >
          <View style={styles.small}>
            <Text style={[styles.text, { color: 'white' }]}>
              x={p.anchor.x.toPrecision(2)}, y={p.anchor.y.toPrecision(2)}
            </Text>
          </View>
        </Mapbox.PointAnnotation>
      ))}
      {sides.map((p, i) => {
        let { x, y } = p.anchor;
        if (x === 1) {
          x = 0;
        }
        if (y === 1) {
          y = 0;
        }
        return (
          <Mapbox.PointAnnotation
            key={`triangle-${i}`}
            id={`triangle-${i}`}
            coordinate={p.coordinate}
            anchor={p.anchor}
          >
            <View style={[styles.large, p.containerStyle]}>
              <View
                style={{
                  height: ANNOTATION_SIZE * 2,
                  width: ANNOTATION_SIZE * 2 * x,
                  backgroundColor: 'green',
                }}
              />
              <View
                style={{
                  height: ANNOTATION_SIZE * 2 * y,
                  width: ANNOTATION_SIZE * 2,
                  backgroundColor: 'green',
                }}
              />
              <Text style={[styles.text, { color: 'black' }]}>
                x={p.anchor.x.toPrecision(2)}, y={p.anchor.y.toPrecision(2)}
              </Text>
            </View>
          </Mapbox.PointAnnotation>
        );
      })}
    </Mapbox.MapView>
  );
};

export default PointAnnotationAnchors;

}