Adds fully defined RF pulse

src/pulses/fixed_pulses.jl

+module FixedPulses
+
+import ...BuildingBlock: PulseBlock
+import ...Variables: variables, duration
+
+
+"""
+    FixedPulse(time, amplitude, phase)
+    FixedPulse(time, amplitude; phase=0., frequency=0.)
+
+Create a Pulse profile that has been fully defined by N control point.
+All arguments should be arrays of the same length N defining these control points.
+
+- `time`: time since the start of this [`BuildingBlock`](@ref) in ms.
+- `amplitude`: amplitude of the RF pulse at every timepoint in kHz.
+- `phase`: phase of the RF pulse at every timpoint in degrees. If not set explicitly it will be determined by the provided starting `phase` (degrees) and the `frequency` (kHz).
+"""
+struct FixedPulse <: PulseBlock
+    time :: Vector{Float64}
+    amplitude :: Vector{Float64}
+    phase :: Vector{Float64}
+    function FixedPulse(time::AbstractVector{<:Number}, amplitude::AbstractVector{<:Number}, phase::AbstractVector{<:Number})
+        @assert length(time) == length(amplitude)
+        @assert length(time) == length(phase)
+        new(Float64.(time), Float64.(amplitude), Float64.(phase))
+    end
+end
+
+function FixedPulse(time::AbstractVector{<:Number}, amplitude::AbstractVector{<:Number}; phase=0., frequency=0.)
+    return FixedPulse(time, amplitude, (time .- time[1]) .* (frequency * 360) .+ phase)
+end
+
+FixedPulse(single_arg::Tuple) = FixedPulse(single_arg...)
+
+variables(::Type{<:FixedPulse}) = []
+
+duration(fg::FixedPulse) = maximum(fg.time)
+
+Base.show(io::IO, fb::FixedPulse) = print(io, "FixedPulse for $(duration(fb)) ms")
+
+end