SmReactArc

Draws a constant-reactance arc. All points on the arc share the same normalised reactance x, with resistance r varying from 0 to +∞.

Demo

:react 1.00

:double (mirror arc) Enable :crop

<SmReactArc :react="1.00" />

Usage

<SmithChart>
  <!-- Single arc for x = 1 (inductive) -->
  <SmReactArc :react="1" fill="rgba(0,0,255,0.2)" />

  <!-- Both polarities at once (x = 1 and x = −1) -->
  <SmReactArc :react="1" :double="true" fill="rgba(0,0,255,0.15)" />

  <!-- Cropped arc: only the portion outside the r=2 resistance circle -->
  <SmReactArc
    :react="0.5"
    :crop="2"
    :double="true"
    fill="none"
    stroke="#e53e3e"
    stroke-width="3"
  />
</SmithChart>

Props

Prop	Type	Default	Description
react	Number | String	—	Normalised reactance value. Positive values are in the upper half (inductive), negative in the lower half (capacitive).
double	Boolean	false	When true, also draws the mirror arc at −react. Useful for symmetric displays where you want to show both the inductive and capacitive arcs together.
crop	Number | String	''	When set, masks away the portion of the arc that falls inside the constant-resistance circle of value crop.

SVG presentation attributes (fill, stroke, stroke-width, opacity, etc.) pass through.

How it works

A constant-reactance arc for value x is a circle with:

• Centre: (1, 1/x) in normalised coordinates
• Radius: |1/x| in normalised coordinates

The arc is the portion of that circle that falls inside the outer boundary circle (r = 0). The crop prop applies an SVG mask to hide the part inside a specified resistance circle.