| Root Element | map | |
|---|---|---|
| Element | arc | |
| Attribute | Format | Remarks |
| radius | float | radius of the arc in nautical miles |
| start | float | start angle (method 1) |
| end | float | end angle (method 1) |
| clockwise | boolean | Draw arc clockwise if “true” (default: true) |
| stroke_pattern | double array | line pattern described in an array of doubles |
| stroke_width | float | line width in pixels |
| stroke_color | string | color id name |
| fill_color | string | color id name |
Use this element to draw an element with the shape of an arc. There are two methods available for building arcs :
Method 1 : Using center and start/end
Requires one <point> element to be the center of the arc.
Requires start and end attributes to be set to the desired start and end angles of the arc (in degrees, range 0-360)
Method 1 has a known error, please do not use it until further notice.
<code XML>
<arc radius=“10” start=“90” end=“270” clockwise=“false” stroke_color=“black” width=“2”>
<point lat=“N0505405” lon=“E0042904”/>
</arc>
</code>
Method 2 : Using 3 points
Requires three <point> elements. Builds an arc that centers on the first point and passes by the specified two other points.
AIS publications such as AIP's use three-point arcs to define lateral airspace borders. This method is especially designed to allow you to define exactly the same airspace in a map.
Brussels CTR:
504434N 0043404E - an arc of circle, 10 NM radius, centered on 505405N 0042904E and traced clockwise to 505203N 0044435E - 504434N 0043404E.
<arc radius="10" clockwise="true" stroke_color="ctr"> <point lat="N0505405" lon="E0042904"/> <point lat="N0505203" lon="E0044435"/> <point lat="N0504434" lon="E0043404"/> </arc>