feat(makie): implement line-stress-strain

plots/line-stress-strain/implementations/julia/makie.jl

@@ -0,0 +1,237 @@
+# anyplot.ai
+# line-stress-strain: Engineering Stress-Strain Curve
+# Library: Makie.jl 0.22 | Julia 1.11
+# Quality: pending | Created: 2026-06-21
+
+using CairoMakie
+using Colors
+using Random
+
+Random.seed!(42)
+
+# Theme tokens
+const THEME       = get(ENV, "ANYPLOT_THEME", "light")
+const PAGE_BG     = THEME == "light" ? colorant"#FAF8F1" : colorant"#1A1A17"
+const ELEVATED_BG = THEME == "light" ? colorant"#FFFDF6" : colorant"#242420"
+const INK         = THEME == "light" ? colorant"#1A1A17" : colorant"#F0EFE8"
+const INK_SOFT    = THEME == "light" ? colorant"#4A4A44" : colorant"#B8B7B0"
+const INK_MUTED   = THEME == "light" ? colorant"#6B6A63" : colorant"#A8A79F"
+const GRID_COLOR  = THEME == "light" ? RGBAf(0.102, 0.102, 0.090, 0.12) : RGBAf(0.941, 0.937, 0.910, 0.12)
+const IMPRINT_PALETTE = [
+    colorant"#009E73",  # 1 — brand green (ALWAYS first series)
+    colorant"#C475FD",  # 2 — lavender
+    colorant"#4467A3",  # 3 — blue
+    colorant"#BD8233",  # 4 — ochre
+    colorant"#AE3030",  # 5 — matte red (semantic: peak / critical)
+    colorant"#2ABCCD",  # 6 — cyan
+    colorant"#954477",  # 7 — rose
+    colorant"#99B314",  # 8 — lime
+]
+
+# Mild steel (AISI 1020) — stress values are realistic; strain axis is schematic
+# (elastic region widened for visual clarity, a standard textbook convention)
+const σ_y1   = 280.0    # upper yield strength (MPa)
+const σ_y2   = 250.0    # lower yield strength / Lüders plateau (MPa)
+const σ_uts  = 420.0    # ultimate tensile strength (MPa)
+const σ_frac = 318.0    # fracture stress (MPa)
+const ε_y1   = 0.015    # upper yield strain (schematic)
+const ε_y2   = 0.025    # lower yield strain (schematic)
+const ε_pe   = 0.065    # end of Lüders plateau
+const ε_uts  = 0.220    # strain at UTS
+const ε_frac = 0.385    # fracture strain
+const E_schm = σ_y1 / ε_y1    # apparent elastic slope for the schematic axis
+
+# Stress-strain curve — five piecewise segments
+eps_el   = collect(range(0.0, ε_y1; length=60))
+sig_el   = E_schm .* eps_el
+
+eps_dip  = collect(range(ε_y1, ε_y2; length=20))
+t_dip    = (eps_dip .- ε_y1) ./ (ε_y2 - ε_y1)
+sig_dip  = σ_y1 .+ (σ_y2 - σ_y1) .* t_dip .^ 0.5
+
+eps_plat = collect(range(ε_y2, ε_pe; length=50))
+t_wvl    = collect(range(0.0, 1.0; length=50))
+sig_plat = σ_y2 .+ 3.5 .* sin.(t_wvl .* 8π) .+ 0.8 .* randn(50)
+
+eps_hard = collect(range(ε_pe, ε_uts; length=150))
+sig_hard = σ_y2 .+ (σ_uts - σ_y2) .* ((eps_hard .- ε_pe) ./ (ε_uts - ε_pe)) .^ 0.27
+
+eps_neck = collect(range(ε_uts, ε_frac; length=70))
+t_neck   = (eps_neck .- ε_uts) ./ (ε_frac - ε_uts)
+sig_neck = σ_uts .- (σ_uts - σ_frac) .* t_neck .^ 0.55
+
+strain = vcat(eps_el, eps_dip[2:end], eps_plat[2:end], eps_hard[2:end], eps_neck[2:end])
+stress = vcat(sig_el, sig_dip[2:end], sig_plat[2:end], sig_hard[2:end], sig_neck[2:end])
+
+# 0.2 % offset line (parallel to elastic region, offset by 0.002 in strain)
+const ε_off0 = 0.002
+eps_off      = collect(range(ε_off0, ε_off0 + σ_uts / E_schm; length=60))
+sig_off      = E_schm .* (eps_off .- ε_off0)
+mask_off     = sig_off .<= σ_uts * 1.01
+eps_off      = eps_off[mask_off]
+sig_off      = sig_off[mask_off]
+
+# Yield point (0.2 % offset intersection with curve)
+const ε_yield = ε_off0 + σ_y2 / E_schm
+const σ_yield = σ_y2
+
+# Young's modulus indicator — dotted line along the elastic slope
+const ε_E_end  = ε_y1 * 0.60
+const ε_E_line = [0.0, ε_E_end]
+const σ_E_line = E_schm .* ε_E_line
+
+# Figure
+fig = Figure(
+    size            = (1600, 900),
+    fontsize        = 14,
+    backgroundcolor = PAGE_BG,
+)
+
+ax = Axis(
+    fig[1, 1];
+    title              = "line-stress-strain · julia · makie · anyplot.ai",
+    titlesize          = 20,
+    titlecolor         = INK,
+    xlabel             = "Engineering Strain  (ε,  schematic scale — elastic region widened for clarity)",
+    ylabel             = "Engineering Stress  (σ, MPa)",
+    xlabelsize         = 13,
+    ylabelsize         = 13,
+    xticklabelsize     = 11,
+    yticklabelsize     = 11,
+    xlabelcolor        = INK_SOFT,
+    ylabelcolor        = INK_SOFT,
+    xticklabelcolor    = INK_SOFT,
+    yticklabelcolor    = INK_SOFT,
+    xtickcolor         = INK_SOFT,
+    ytickcolor         = INK_SOFT,
+    backgroundcolor    = PAGE_BG,
+    topspinevisible    = false,
+    rightspinevisible  = false,
+    leftspinecolor     = INK_SOFT,
+    bottomspinecolor   = INK_SOFT,
+    xgridvisible       = false,
+    ygridvisible       = true,
+    ygridcolor         = GRID_COLOR,
+)
+
+xlims!(ax, -0.008, 0.425)
+ylims!(ax, -20.0,  510.0)
+
+# Region background shading
+poly!(ax, [Point2f(0.0, -20), Point2f(ε_y1, -20), Point2f(ε_y1, 472), Point2f(0.0, 472)];
+    color = RGBAf(0.0, 0.620, 0.451, 0.07), strokewidth = 0)
+
+poly!(ax, [Point2f(ε_y1, -20), Point2f(ε_uts, -20), Point2f(ε_uts, 472), Point2f(ε_y1, 472)];
+    color = RGBAf(0.267, 0.404, 0.639, 0.05), strokewidth = 0)
+
+poly!(ax, [Point2f(ε_uts, -20), Point2f(0.425, -20), Point2f(0.425, 472), Point2f(ε_uts, 472)];
+    color = RGBAf(0.741, 0.510, 0.200, 0.06), strokewidth = 0)
+
+# Region boundaries
+vlines!(ax, [ε_y1, ε_uts];
+    color     = INK_MUTED,
+    linewidth = 1.0,
+    linestyle = :dash,
+)
+
+# 0.2 % offset line
+lines!(ax, eps_off, sig_off;
+    color     = IMPRINT_PALETTE[3],
+    linewidth = 2.0,
+    linestyle = :dash,
+)
+
+# Main stress-strain curve (on top)
+lines!(ax, strain, stress;
+    color     = IMPRINT_PALETTE[1],
+    linewidth = 3.5,
+)
+
+# Young's modulus slope indicator
+lines!(ax, ε_E_line, σ_E_line;
+    color     = INK_MUTED,
+    linewidth = 2.0,
+    linestyle = :dot,
+)
+
+# Horizontal reference at UTS
+hlines!(ax, [σ_uts];
+    color     = IMPRINT_PALETTE[5],
+    linewidth = 0.8,
+    linestyle = :dot,
+)
+
+# Critical point markers
+scatter!(ax, [ε_yield], [σ_yield];
+    color       = IMPRINT_PALETTE[1],
+    markersize  = 16,
+    strokewidth = 2.0,
+    strokecolor = INK,
+)
+scatter!(ax, [ε_uts], [σ_uts];
+    color       = IMPRINT_PALETTE[5],
+    markersize  = 16,
+    strokewidth = 2.0,
+    strokecolor = INK,
+)
+scatter!(ax, [ε_frac], [σ_frac];
+    color       = INK_SOFT,
+    markersize  = 16,
+    strokewidth = 2.0,
+    strokecolor = INK,
+)
+
+# Region labels (top of shaded areas)
+text!(ax, ε_y1 / 2, 485;
+    text     = "Elastic",
+    fontsize = 13,
+    color    = INK_SOFT,
+    align    = (:center, :center),
+)
+text!(ax, (ε_y1 + ε_uts) / 2, 485;
+    text     = "Plastic  (Strain Hardening)",
+    fontsize = 13,
+    color    = INK_SOFT,
+    align    = (:center, :center),
+)
+text!(ax, (ε_uts + 0.425) / 2, 485;
+    text     = "Necking",
+    fontsize = 13,
+    color    = INK_SOFT,
+    align    = (:center, :center),
+)
+
+# Critical point annotations
+text!(ax, ε_yield + 0.009, σ_yield + 22;
+    text     = "Yield Point (0.2 % offset)\n$(Int(round(σ_yield))) MPa",
+    fontsize = 11,
+    color    = INK_SOFT,
+    align    = (:left, :bottom),
+)
+text!(ax, ε_uts + 0.010, σ_uts + 8;
+    text     = "UTS = $(Int(round(σ_uts))) MPa",
+    fontsize = 11,
+    color    = IMPRINT_PALETTE[5],
+    align    = (:left, :bottom),
+)
+text!(ax, ε_frac + 0.007, σ_frac;
+    text     = "Fracture\n$(Int(round(σ_frac))) MPa",
+    fontsize = 11,
+    color    = INK_SOFT,
+    align    = (:left, :center),
+)
+text!(ax, ε_off0 + 0.010, 48;
+    text     = "0.2 % offset line",
+    fontsize = 11,
+    color    = IMPRINT_PALETTE[3],
+    align    = (:left, :center),
+)
+text!(ax, ε_E_end + 0.003, σ_E_line[end] - 20;
+    text     = "slope = E ≈ 200 GPa",
+    fontsize = 11,
+    color    = INK_MUTED,
+    align    = (:left, :top),
+)
+
+# Save
+save("plot-$(THEME).png", fig; px_per_unit = 2)

plots/line-stress-strain/metadata/julia/makie.yaml

@@ -0,0 +1,21 @@
+# Per-library metadata for makie implementation of line-stress-strain
+# Auto-generated by impl-generate.yml
+
+library: makie
+language: julia
+specification_id: line-stress-strain
+created: '2026-06-21T09:56:52Z'
+updated: '2026-06-21T09:56:52Z'
+generated_by: claude-sonnet
+workflow_run: 27900326705
+issue: 4413
+language_version: 1.11.9
+library_version: 0.22.10
+preview_url_light: https://storage.googleapis.com/anyplot-images/plots/line-stress-strain/julia/makie/plot-light.png
+preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/line-stress-strain/julia/makie/plot-dark.png
+preview_html_light: null
+preview_html_dark: null
+quality_score: null
+review:
+  strengths: []
+  weaknesses: []