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using Plots
phi = pi / 3
x0 = 0
y0 = 0
u0 = 100 * cos(phi)
v0 = 100 * sin(phi)
g = 9.81
function iterate(x, y, u, v, h, k)
xn = x + h * u
yn = y + h * v
un = u * (1 - h * k * sqrt(u * u + v * v))
vn = v - h * (g + k * sqrt(u * u + v * v) * v)
return (xn, yn, un, vn)
end
function getPoints(k, h, phi)
x0 = 0
y0 = 0
u0 = 100 * cos(phi)
v0 = 100 * sin(phi)
x = x0
y = y0
u = u0
v = v0
X = Array{Float64}(undef, 0)
Y = Array{Float64}(undef, 0)
i = 1
while y >= 0
if (y < 0)
return (X[1:1:i - 1], Y[1:1:i - 1])
end
append!(X, x)
append!(Y, y)
x, y, u, v = iterate(x, y, u, v, h, k)
i += 1
end
println(x, " ", y)
return (X, Y)
end
function plotArmata(K, phi, h)
X, Y = getPoints(K[1], h, phi[1])
p = plot(X, Y, label=string("k: ", (K[1]), " φ: ", string(phi[1])[1:1:5]); draw_arrow=true, aspect_ratio=:equal)
for i in 2:length(K)
X, Y = getPoints(K[i], h, phi[i])
plot!(p, X, Y, label=string("k: ", (K[i]), " φ: ", string(phi[i])[1:1:5]), aspect_ratio=:equal)
end
xlabel!("Odległość [m]")
ylabel!("Wysokość [m]")
display(p)
end
# plotArmata([0.01, 0.012, 0.014, 0.016, 0.018, 0.2], 0.01)
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