private void Start()
{
OnlineMaps api = OnlineMaps.instance;
List <Vector2> line = new List <Vector2>
{
//Geographic coordinates
new Vector2(3, 3),
new Vector2(5, 3),
new Vector2(4, 4),
new Vector2(9.3f, 6.5f)
};
List <Vector2> poly = new List <Vector2>
{
//Geographic coordinates
new Vector2(0, 0),
new Vector2(1, 0),
new Vector2(2, 2),
new Vector2(0, 1)
};
// Draw line
api.AddDrawingElement(new OnlineMapsDrawingLine(line, Color.green, 5));
// Draw filled transparent poly
api.AddDrawingElement(new OnlineMapsDrawingPoly(poly, Color.red, 1, new Color(1, 1, 1, 0.5f)));
// Draw filled rectangle
// (position, size, borderColor, borderWeight, backgroundColor)
api.AddDrawingElement(new OnlineMapsDrawingRect(new Vector2(2, 2), new Vector2(1, 1), Color.green, 1,
Color.blue));
}
private void Update()
{
if (_borderWeight != borderWeight)
{
_borderWeight = borderWeight;
if (polygon != null)
{
polygon.borderWeight = borderWeight;
map.Redraw();
}
}
// Check the position of the markers.
CheckMarkerPositions();
// If nothing happens, then return.
if (!changed)
{
return;
}
changed = false;
// If the number of points is less than 3, then return.
if (markers.Count < 3)
{
map.Redraw();
return;
}
// If the polygon is not created, then create.
if (polygon == null)
{
// For points, reference to markerPositions.
// If you change the values in markerPositions, value in the polygon will be adjusted automatically.
polygon = new OnlineMapsDrawingPoly(markerPositions, Color.black, borderWeight, new Color(1, 1, 1, 0.3f));
// Add an element to the map.
map.AddDrawingElement(polygon);
}
// Calculates area of the polygon.
// Important: this algorithm works correctly only if the lines do not intersect.
float area = 0;
// Triangulate points.
int[] indexes = OnlineMapsUtils.Triangulate(markerPositions).ToArray();
// Calculate the area of each triangle.
for (int i = 0; i < indexes.Length / 3; i++)
{
// Get the points of the triangle.
Vector2 p1 = markerPositions[indexes[i * 3]];
Vector2 p2 = markerPositions[indexes[i * 3 + 1]];
Vector2 p3 = markerPositions[indexes[i * 3 + 2]];
// Calculate the distance between points.
float d1 = OnlineMapsUtils.DistanceBetweenPoints(p1, p2).magnitude;
float d2 = OnlineMapsUtils.DistanceBetweenPoints(p2, p3).magnitude;
float d3 = OnlineMapsUtils.DistanceBetweenPoints(p3, p1).magnitude;
// Calculate the area.
float p = (d1 + d2 + d3) / 2;
area += Mathf.Sqrt(p * (p - d1) * (p - d2) * (p - d2));
}
Debug.Log("Area: " + area + " km^2");
map.Redraw();
}
