Revision history [back]
 | 1 | initial version |
Here is an example code snippet for creating a circle using osgEarth::CircleNode:
#include <osgEarth/CircleNode>
#include <osgEarth/GeoData>
// create a GeoPoint as the center of the circle
osgEarth::GeoPoint center(osgEarth::SpatialReference::get("wgs84"), -105.2207, 40.0239, 0.0, osgEarth::ALTMODE_ABSOLUTE);
// create a CircleNode with a radius of 500 meters, 360 segments, and a red fill color
osgEarth::CircleNode* circle = new osgEarth::CircleNode(center, 500.0, 360, osgEarth::Color::Red);
// add the circle to a parent node or scene graph
parent->addChild(circle);
First, you need to create a GeoPoint to define the center of the circle. The GeoPoint includes a spatial reference (such as "wgs84"), latitude and longitude in degrees, and an altitude in meters (use 0.0 for 2D circles).
Next, create a CircleNode with the GeoPoint center, radius in meters, number of segments (for the circle's shape), and a fill color (optional).
Finally, add the CircleNode to a parent node or scene graph to visualize the circle.