Draw Ellipse Mode

Ellipse Mode allows you to add ellipses to the map by defining a center point and two radii (x and y semi-axes).

You can enable Draw Ellipse Mode like this:

map.gm.enableDraw("ellipse");
map.gm.disableDraw();
map.gm.toggleDraw("ellipse");
map.gm.drawEnabled("ellipse");

// Or like this:
map.gm.enableMode("draw", "ellipse");
map.gm.disableMode("draw", "ellipse");
map.gm.toggleMode("draw", "ellipse");
map.gm.isModeEnabled("draw", "ellipse");

The following events are available on a map instance:

Event	Params	Description	Output
gm:drawstart	event	Fired when ellipse drawing starts.	map, shape
gm:create	event	Fired when an ellipse is created.	map, shape, feature

Behavior

Ellipse drawing operates by:

1. Clicking on the map to place the ellipse center
2. Moving the mouse to adjust the x semi-axis (width)
3. Clicking to set the width, then moving to adjust the y semi-axis (height)
4. Clicking again to finalize the ellipse

The ellipse is represented as a GeoJSON polygon with smooth edges for rendering. The feature properties include:

• xSemiAxis: The horizontal radius of the ellipse
• ySemiAxis: The vertical radius of the ellipse
• center: The center point coordinates

Live Draw Ellipse Example