feat(ggplot2): implement errorbar-basic

plots/errorbar-basic/implementations/r/ggplot2.R

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+#' anyplot.ai
+#' errorbar-basic: Basic Error Bar Plot
+#' Library: ggplot2 3.5.1 | R 4.4.1
+#' Quality: 90/100 | Created: 2026-06-30
+
+library(ggplot2)
+library(ragg)
+
+# Theme tokens — Imprint palette, theme-adaptive chrome
+THEME    <- Sys.getenv("ANYPLOT_THEME", "light")
+PAGE_BG  <- if (THEME == "light") "#FAF8F1" else "#1A1A17"
+INK      <- if (THEME == "light") "#1A1A17" else "#F0EFE8"
+INK_SOFT <- if (THEME == "light") "#4A4A44" else "#B8B7B0"
+
+IMPRINT_PALETTE <- c(
+    "#009E73",  # 1 — brand green (first series)
+    "#C475FD",  # 2 — lavender
+    "#4467A3",  # 3 — blue
+    "#BD8233",  # 4 — ochre
+    "#AE3030",  # 5 — matte red
+    "#2ABCCD",  # 6 — cyan
+    "#954477",  # 7 — rose
+    "#99B314"   # 8 — lime
+)
+
+# Data: enzyme activity across temperature conditions (mean ± 1 SD, n = 12 replicates)
+conditions    <- c("20°C", "25°C", "30°C", "35°C", "40°C", "45°C", "50°C")
+mean_activity <- c(12.4, 18.7, 27.3, 35.6, 28.4, 19.1, 8.3)
+sd_activity   <- c(1.8,  2.1,  2.9,  3.2,  2.7,  1.9,  1.4)
+
+df <- data.frame(
+    temperature = factor(conditions, levels = conditions),
+    mean_act    = mean_activity,
+    lower       = mean_activity - sd_activity,
+    upper       = mean_activity + sd_activity
+)
+
+# Plot
+p <- ggplot(df, aes(x = temperature, y = mean_act)) +
+    geom_errorbar(
+        aes(ymin = lower, ymax = upper),
+        width     = 0.22,
+        linewidth = 1.0,
+        color     = IMPRINT_PALETTE[1]
+    ) +
+    geom_point(
+        size  = 3.5,
+        color = IMPRINT_PALETTE[1]
+    ) +
+    # Enlarged marker highlights the enzyme optimum at 35°C
+    geom_point(
+        data  = df[df$temperature == "35°C", ],
+        size  = 6.0,
+        color = IMPRINT_PALETTE[1]
+    ) +
+    # Focal-point annotation at enzyme optimum
+    annotate(
+        "text",
+        x     = 4,
+        y     = 40.5,
+        label = "enzyme optimum",
+        color = INK_SOFT,
+        size  = 3.2,
+        hjust = 0.5
+    ) +
+    scale_y_continuous(expand = expansion(mult = c(0.05, 0.13))) +
+    labs(
+        x       = "Temperature",
+        y       = "Enzyme Activity (μmol / min)",
+        title   = "errorbar-basic · r · ggplot2 · anyplot.ai",
+        caption = "Error bars: ±1 SD  (n = 12 replicates per condition)"
+    ) +
+    theme_minimal(base_size = 8) +
+    theme(
+        plot.background    = element_rect(fill = PAGE_BG, color = PAGE_BG),
+        panel.background   = element_rect(fill = PAGE_BG, color = NA),
+        panel.border       = element_blank(),
+        panel.grid.major.y = element_line(
+            color     = grDevices::adjustcolor(INK_SOFT, alpha.f = 0.45),
+            linewidth = 0.4
+        ),
+        panel.grid.major.x = element_blank(),
+        panel.grid.minor   = element_blank(),
+        axis.line          = element_line(color = INK_SOFT, linewidth = 0.5),
+        axis.title         = element_text(color = INK,      size = 10),
+        axis.text          = element_text(color = INK_SOFT, size = 8),
+        plot.title         = element_text(color = INK,      size = 12),
+        plot.caption       = element_text(color = INK_SOFT, size = 7,  hjust = 0),
+        plot.margin        = margin(20, 24, 16, 20)
+    )
+
+# Save
+ggsave(
+    filename = sprintf("plot-%s.png", THEME),
+    plot     = p,
+    device   = ragg::agg_png,
+    width    = 8,
+    height   = 4.5,
+    units    = "in",
+    dpi      = 400
+)

plots/errorbar-basic/metadata/r/ggplot2.yaml

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+library: ggplot2
+language: r
+specification_id: errorbar-basic
+created: '2026-06-30T20:35:03Z'
+updated: '2026-06-30T20:51:59Z'
+generated_by: claude-sonnet
+workflow_run: 28473855854
+issue: 973
+language_version: 4.4.1
+library_version: 3.5.1
+preview_url_light: https://storage.googleapis.com/anyplot-images/plots/errorbar-basic/r/ggplot2/plot-light.png
+preview_url_dark: https://storage.googleapis.com/anyplot-images/plots/errorbar-basic/r/ggplot2/plot-dark.png
+preview_html_light: null
+preview_html_dark: null
+quality_score: 90
+review:
+  strengths:
+  - Correct Imprint palette (#009E73) used throughout both light and dark renders
+    with properly themed chrome
+  - Enlarged focal point at 35°C plus enzyme optimum annotation provides clear visual
+    hierarchy guiding the viewer to the key insight
+  - 'Perfect spec compliance: error bars with visible caps, consistent widths, and
+    center-value markers'
+  - Excellent real-world biochemistry dataset (enzyme kinetics temperature response)
+    with scientifically plausible values and appropriate error magnitudes
+  - 'Clean ggplot2 grammar of graphics usage: layer composition of geom_errorbar and
+    geom_point, idiomatic annotate(), expansion() for axis padding'
+  - All font sizes explicitly set (title=12pt, axis.title=10pt, axis.text=8pt, caption=7pt)
+    with proper theme-adaptive chrome in both renders
+  - Methodological caption explaining error bar meaning adds credibility
+  weaknesses:
+  - Annotation text size=3.2mm (approx 9pt) is small relative to the canvas — consider
+    increasing to size=3.8–4.0 for better readability at scaled sizes
+  - 'DE-01 moderate: the design, while clean, is still close to a well-configured
+    library default — additional refinement such as a bold focal data label or a more
+    deliberate emphasis on the bell-curve narrative could push it further'
+  - 'LM-02: the double geom_point() emphasis and adjustcolor() grid alpha trick show
+    ggplot2 idioms, but no uniquely ggplot2-specific feature (e.g., stat_smooth, geom_ribbon
+    for CI bands, coord_flip) was used'
+  image_description: |-
+    Light render (plot-light.png):
+      Background: Warm off-white #FAF8F1 — correct, not pure white
+      Chrome: Title "errorbar-basic · r · ggplot2 · anyplot.ai" in dark #1A1A17 ink, clearly readable. Axis labels "Temperature" (x) and "Enzyme Activity (μmol / min)" (y) in dark ink, well-proportioned at 10pt. Tick labels (20°C–50°C, numeric y values) in #4A4A44 INK_SOFT at 8pt, readable. Caption "Error bars: ±1 SD (n = 12 replicates per condition)" in small 7pt soft ink at bottom left. Annotation "enzyme optimum" in INK_SOFT above the 35°C peak.
+      Data: All error bars and points rendered in brand green #009E73. Error bars with visible horizontal caps. Standard points at size=3.5, enlarged focal point at 35°C at size=6.0 to highlight the enzyme optimum. Bell-curve distribution of means from 12.4 to 35.6 μmol/min peaking at 35°C.
+      Legibility verdict: PASS — all text clearly readable against the warm off-white background; no light-on-light text issues.
+
+    Dark render (plot-dark.png):
+      Background: Warm near-black #1A1A17 — correct, not pure black
+      Chrome: Title in light #F0EFE8 ink, clearly readable against dark background. Axis labels and tick labels in #B8B7B0 INK_SOFT, readable. Caption in soft light text. Annotation "enzyme optimum" in light secondary ink. No dark-on-dark text failures detected.
+      Data: Data colors identical to light render — all error bars and points in #009E73 brand green. The enlarged 35°C focal point and annotation are present identically. Grid lines visible as subtle gray horizontal rules.
+      Legibility verdict: PASS — all text readable against the dark background; brand green remains clearly visible; no dark-on-dark failures.
+  criteria_checklist:
+    visual_quality:
+      score: 29
+      max: 30
+      items:
+      - id: VQ-01
+        name: Text Legibility
+        score: 7
+        max: 8
+        passed: true
+        comment: All font sizes explicitly set (title=12pt, axis.title=10pt, axis.text=8pt,
+          caption=7pt, annotation=3.2mm). All text readable in both themes. Annotation
+          text at size=3.2mm is small but visible.
+      - id: VQ-02
+        name: No Overlap
+        score: 6
+        max: 6
+        passed: true
+        comment: No overlapping text or data elements. Annotation well-separated above
+          data. Tick labels well-spaced.
+      - id: VQ-03
+        name: Element Visibility
+        score: 6
+        max: 6
+        passed: true
+        comment: Error bars with caps clearly visible. Points sized appropriately
+          for 7 data points. Enlarged focal point at 35°C (size=6) clearly distinguishable
+          from standard points (size=3.5).
+      - id: VQ-04
+        name: Color Accessibility
+        score: 2
+        max: 2
+        passed: true
+        comment: 'Single series in Imprint brand green #009E73 — colorblind-safe.
+          Good contrast against both light and dark backgrounds.'
+      - id: VQ-05
+        name: Layout & Canvas
+        score: 4
+        max: 4
+        passed: true
+        comment: Good layout proportions. Canvas gate passed (3200x1800). Balanced
+          margins. Nothing cut off.
+      - id: VQ-06
+        name: Axis Labels & Title
+        score: 2
+        max: 2
+        passed: true
+        comment: 'Y-axis: ''Enzyme Activity (μmol / min)'' with units. X-axis: ''Temperature''
+          descriptive.'
+      - id: VQ-07
+        name: Palette Compliance
+        score: 2
+        max: 2
+        passed: true
+        comment: 'Single series correctly uses #009E73 brand green. Light background
+          #FAF8F1, dark background #1A1A17. All chrome correctly theme-adaptive in
+          both renders.'
+    design_excellence:
+      score: 13
+      max: 20
+      items:
+      - id: DE-01
+        name: Aesthetic Sophistication
+        score: 5
+        max: 8
+        passed: true
+        comment: 'Above well-configured default: enlarged focal point for emphasis,
+          clean annotation, Imprint palette. Not yet FiveThirtyEight-level design.'
+      - id: DE-02
+        name: Visual Refinement
+        score: 4
+        max: 6
+        passed: true
+        comment: L-shaped axis frame, horizontal-only major grid with alpha-adjusted
+          color, no minor grid, generous margins. Clear refinement above defaults.
+      - id: DE-03
+        name: Data Storytelling
+        score: 4
+        max: 6
+        passed: true
+        comment: Enlarged 35°C point + 'enzyme optimum' annotation actively guides
+          viewer. Bell-curve pattern clearly communicated. Caption adds methodological
+          credibility.
+    spec_compliance:
+      score: 15
+      max: 15
+      items:
+      - id: SC-01
+        name: Plot Type
+        score: 5
+        max: 5
+        passed: true
+        comment: Correct error bar plot with center-value markers and visible caps.
+      - id: SC-02
+        name: Required Features
+        score: 4
+        max: 4
+        passed: true
+        comment: Error bars with caps, consistent widths, center markers, error magnitude
+          varies by condition.
+      - id: SC-03
+        name: Data Mapping
+        score: 3
+        max: 3
+        passed: true
+        comment: 'X: categorical temperature, Y: enzyme activity. All 7 conditions
+          visible.'
+      - id: SC-04
+        name: Title & Legend
+        score: 3
+        max: 3
+        passed: true
+        comment: Title exactly 'errorbar-basic · r · ggplot2 · anyplot.ai'. No legend
+          needed for single series.
+    data_quality:
+      score: 15
+      max: 15
+      items:
+      - id: DQ-01
+        name: Feature Coverage
+        score: 6
+        max: 6
+        passed: true
+        comment: 'Shows all aspects: error bars with caps, varying magnitudes, bell-curve
+          response pattern with a clear peak.'
+      - id: DQ-02
+        name: Realistic Context
+        score: 5
+        max: 5
+        passed: true
+        comment: 'Real biochemistry scenario: enzyme kinetics temperature response.
+          Non-controversial, scientifically meaningful.'
+      - id: DQ-03
+        name: Appropriate Scale
+        score: 4
+        max: 4
+        passed: true
+        comment: Activity values 8.3–35.6 μmol/min plausible. 20°C–50°C range appropriate
+          for mesophilic enzyme. SDs 1.4–3.2 reasonable for biological replicates.
+          Optimum at 35°C near physiological temperature.
+    code_quality:
+      score: 10
+      max: 10
+      items:
+      - id: CQ-01
+        name: KISS Structure
+        score: 3
+        max: 3
+        passed: true
+        comment: 'Linear: imports → tokens → data → plot → save. No functions or classes.'
+      - id: CQ-02
+        name: Reproducibility
+        score: 2
+        max: 2
+        passed: true
+        comment: Fully deterministic hardcoded data vectors. No random generation
+          needed.
+      - id: CQ-03
+        name: Clean Imports
+        score: 2
+        max: 2
+        passed: true
+        comment: Only ggplot2 and ragg imported, both used.
+      - id: CQ-04
+        name: Code Elegance
+        score: 2
+        max: 2
+        passed: true
+        comment: Clean idiomatic R. Double geom_point() layering for emphasis is an
+          elegant ggplot2 pattern.
+      - id: CQ-05
+        name: Output & API
+        score: 1
+        max: 1
+        passed: true
+        comment: Saves as plot-{THEME}.png via sprintf(). Modern ggplot2 API (linewidth=
+          not size= for lines).
+    library_mastery:
+      score: 8
+      max: 10
+      items:
+      - id: LM-01
+        name: Idiomatic Usage
+        score: 5
+        max: 5
+        passed: true
+        comment: 'Expert grammar of graphics: geom_errorbar + layered geom_point,
+          annotate(), scale_y_continuous(expand=expansion()), theme_minimal() base
+          with layer-on-top theme customization.'
+      - id: LM-02
+        name: Distinctive Features
+        score: 3
+        max: 5
+        passed: true
+        comment: Uses adjustcolor() trick for grid line alpha (ggplot2-specific workaround),
+          expansion() for axis padding, and double geom_point() layering for emphasis
+          — all ggplot2-idiomatic patterns.
+  verdict: APPROVED
+impl_tags:
+  dependencies: []
+  techniques:
+  - annotations
+  - layer-composition
+  patterns:
+  - data-generation
+  dataprep: []
+  styling:
+  - grid-styling