MapCircle QML Type

The MapCircle type displays a geographic circle on a Map. More...

• List of all members, including inherited members
• MapCircle is part of QML Maps Plugin.

Properties

• autoFadeIn : bool
• border
  • border.color : color
  • border.width : int
• center : coordinate
• color : color
• opacity : real
• radius : real

Detailed Description

The MapCircle type displays a geographic circle on a Map, which consists of all points that are within a set distance from one central point. Depending on map projection, a geographic circle may not always be a perfect circle on the screen: for instance, in the Mercator projection, circles become ovoid in shape as they near the poles. To display a perfect screen circle around a point, use a MapQuickItem containing a relevant Qt Quick type instead.

By default, the circle is displayed as a 1 pixel black border with no fill. To change its appearance, use the color, border.color and border.width properties.

Internally, a MapCircle is implemented as a many-sided polygon. To calculate the radius points it uses a spherical model of the Earth, similar to the atDistanceAndAzimuth method of the coordinate type. These two things can occasionally have implications for the accuracy of the circle's shape, depending on position and map projection.

Example Usage

The following snippet shows a map containing a MapCircle, centered at the coordinate (-27, 153) with a radius of 5km. The circle is filled in green, with a 3 pixel black border.

Map {
    MapCircle {
        center {
            latitude: -27.5
            longitude: 153.0
        }
        radius: 5000.0
        color: 'green'
        border.width: 3
    }
}

Property Documentation