API reference / @zaes/tactical-graphics / ArcAndArrowFrame

Interface: ArcAndArrowFrame

Defined in: tacticalgraphics/core/anchors.ts:490

An arc with an arrow off its back — Ambush's three points

APP-06 141700: "Point 1 is the tip of the arrowhead. Points 2 and 3 define the endpoints of the curved line on the back side of the symbol."

The curved line spans 120 degrees, so points 2 and 3 sit a third of a circle apart and their chord is 2 * radius * sin(60). That fixes the radius without needing the center to be drawn — the center is recovered from the chord instead, which is the whole reason this reader exists rather than a centre-and-edge pair.

Point 1 is honored as an actual tip rather than only a direction, so the arrow's reach is a proportion the user sets. The dropped form fixed it at two radii.

Properties

angle

angle: number;

Defined in: tacticalgraphics/core/anchors.ts:494

Planar radians CCW from east: the direction the arrow points.

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arrowReach

arrowReach: number;

Defined in: tacticalgraphics/core/anchors.ts:498

How far the tip sits from the center, as a multiple of the radius.

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center

center: Position;

Defined in: tacticalgraphics/core/anchors.ts:492

Center of the circle the arc is cut from.

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radius

radius: number;

Defined in: tacticalgraphics/core/anchors.ts:496

Radius of the arc.