fluidPage(
fluidRow(
bs4Box(
title="Settings",
width=4,
textInput("angszeAbs3", h5("Absolute size"),
value=c("1 2 3")),
selectInput("angszeUnitAbs3", h5("Unit absolute size"),
choices=unitsAbs, selected=1),
textInput("angszeAng3", h5("Angular size"), value="1"),
selectInput("angszeUnitAng3", h5("Unit angular size"),
choices=unitsAng, selected=2),
h4("Output"),
selectizeInput("angszeUnitDstOut3", h5("Unit distance"),
choices=unitsAbs, multiple=TRUE, selected=c(1, 4))
),
bs4Box(
title="Calculate distance from absolute and angular size",
width=8,
verbatimTextOutput("angAbs2Dist"),
h6("Math"),
p("Distance to target \\(d\\) can be calculated from absolute
object size \\(s\\) and angular size, assuming that the
argument for \\(\\tan(\\cdot)\\) and the
result from \\(\\arctan(\\cdot)\\) are in radian, and that
distance to target \\(d\\) and object size \\(s\\) are measured
in the same unit:"),
HTML("<ul>
<li>From angle \\(\\alpha\\) in degree: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(\\alpha \\cdot \\pi/360)}\\)</li>
<li>From angle \\(\\alpha\\) in MOA: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(\\alpha \\cdot \\pi/21600)}\\)</li>
<li>From angle \\(\\alpha\\) in SMOA: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(\\alpha \\cdot \\arctan(1/7200))}\\)</li>
<li>From arc length \\(x\\) in rad: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(x / 2)}\\)</li>
<li>From arc length \\(x\\) in mrad: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(x / 2000)}\\)</li>
<li>From arc length \\(x\\) in NATO mil: \\(d = \\frac{s}{2} \\cdot
\\frac{1}{\\tan(x \\cdot \\pi / 6400)}\\)
</ul>")
)
)
)
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