feat(highcharts): implement renko-basic

[github-actions]

Implementation: renko-basic - highcharts

Implements the highcharts version of renko-basic.

File: plots/renko-basic/implementations/highcharts.py

Parent Issue: #3294

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🤖 impl-generate workflow

[claude]

AI Review - Attempt 1/3

Image Description

The plot displays a Renko chart showing stock price movements using columnrange bars. Green bricks represent bullish (upward) price movements and red bricks represent bearish (downward) movements. The chart shows approximately 70 bricks tracking price from around $86 to $114. The title reads "renko-basic · highcharts · pyplots.ai" with a subtitle "Stock Price Movement | Brick Size: $2". The X-axis is labeled "Brick Index" (0-70) and Y-axis shows "Price ($)" ranging from $84 to $116 with dollar sign formatting. A legend in the top-right corner identifies "Bullish (Up)" in green and "Bearish (Down)" in red. Subtle grid lines help identify price levels. The chart clearly shows trend patterns with extended runs of same-direction bricks followed by reversals.

Quality Score: 87/100

Criteria Checklist

Visual Quality (35/40)

• VQ-01: Text Legibility (10/10) - Title at 56px, labels at 40px, tick labels at 32px - all clearly readable
• VQ-02: No Overlap (8/8) - No overlapping text elements anywhere
• VQ-03: Element Visibility (8/8) - Bricks are well-sized with clear borders, easily distinguishable
• VQ-04: Color Accessibility (0/5) - Uses red-green combination which is problematic for colorblind users (deuteranopia/protanopia)
• VQ-05: Layout Balance (5/5) - Good margins, plot fills canvas well, legend well-positioned
• VQ-06: Axis Labels (2/2) - Descriptive labels with units: "Price ($)", "Brick Index"
• VQ-07: Grid & Legend (2/2) - Subtle grid (alpha 0.1-0.15), legend has background and border

Spec Compliance (25/25)

• SC-01: Plot Type (8/8) - Correct Renko chart using columnrange for bricks
• SC-02: Data Mapping (5/5) - Brick index on X, price range on Y correctly mapped
• SC-03: Required Features (5/5) - Bullish/bearish bricks, uniform size, trend visibility, grid present
• SC-04: Data Range (3/3) - All bricks visible, Y-axis shows full price range
• SC-05: Legend Accuracy (2/2) - Legend correctly identifies Bullish (Up) and Bearish (Down)
• SC-06: Title Format (2/2) - Uses correct format "renko-basic · highcharts · pyplots.ai"

Data Quality (17/20)

• DQ-01: Feature Coverage (8/8) - Shows both bullish and bearish sequences, trend reversals, extended runs
• DQ-02: Realistic Context (5/7) - Stock price simulation is plausible but generic (not a named scenario)
• DQ-03: Appropriate Scale (4/5) - $100 starting price, $2 brick size, 300 days - reasonable but brick size could better match spec example

Code Quality (10/10)

• CQ-01: KISS Structure (3/3) - Linear flow: imports → data → Renko calculation → chart config → export
• CQ-02: Reproducibility (3/3) - Uses np.random.seed(42)
• CQ-03: Clean Imports (2/2) - All imports are used
• CQ-04: No Deprecated API (1/1) - Uses current highcharts-core API
• CQ-05: Output Correct (1/1) - Saves as plot.png and plot.html

Library Features (0/5)

• LF-01: Distinctive Features (0/5) - Uses basic columnrange, does not leverage Highcharts stock chart features or built-in OHLC/candlestick capabilities that could be adapted

Strengths

• Correct Renko brick calculation algorithm with proper price tracking
• Excellent text sizing for 4800x2700 canvas
• Clean separation of bullish/bearish series with borders
• Proper HTML export with inline scripts for headless Chrome compatibility
• Good use of subtitle to show brick size parameter

Weaknesses

• Uses red-green color scheme which fails colorblind accessibility - should use colorblind-safe alternatives like blue/orange or blue/red with different saturations
• Does not leverage Highcharts stock module or specialized financial chart features

Verdict: REJECTED

[github-actions]

🔧 Repair Attempt 1/3

Applied fixes based on AI review feedback.

Status: Repair completed, re-triggering review...

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🤖 impl-repair

[claude]

AI Review - Attempt 2/3

Image Description

The plot displays a Renko chart with approximately 70+ bricks showing stock price movements from around $84 to $116. Blue bricks represent bullish (upward) price movements and orange bricks represent bearish (downward) movements - a colorblind-safe palette. The chart starts at ~$100, drops to a low around $86, then recovers to peak near $114. The title "renko-basic · highcharts · pyplots.ai" is prominently displayed with a subtitle showing "Stock Price Movement | Brick Size: $2". A well-positioned legend in the top-right corner identifies the two series. Both axes have clear labels ("Brick Index" and "Price ($)") with dollar formatting on the y-axis. A subtle grid helps identify price levels. The bricks are uniform in size with clear borders and small gaps between them.

Quality Score: 92/100

Criteria Checklist

Visual Quality (36/40 pts)

• VQ-01: Text Legibility (9/10) - Title, subtitle, axis labels, and tick marks are all clearly readable at full resolution. Font sizes are appropriate for the 4800x2700 canvas.
• VQ-02: No Overlap (8/8) - No overlapping text elements; all labels are clearly separated.
• VQ-03: Element Visibility (8/8) - Bricks are perfectly sized and visible with clear borders distinguishing each brick.
• VQ-04: Color Accessibility (5/5) - Blue/orange palette is colorblind-safe, avoiding red-green conflict.
• VQ-05: Layout Balance (4/5) - Good use of canvas space; minor deduction for slightly larger margins than needed.
• VQ-06: Axis Labels (2/2) - Y-axis shows "Price ($)" with units, X-axis shows "Brick Index" which is descriptive.
• VQ-07: Grid & Legend (0/2) - Grid is appropriately subtle. Legend is well-positioned with background.

Spec Compliance (25/25 pts)

• SC-01: Plot Type (8/8) - Correct Renko chart using columnrange to represent bricks.
• SC-02: Data Mapping (5/5) - X-axis shows brick index, Y-axis shows price range correctly.
• SC-03: Required Features (5/5) - Has bullish/bearish colors, uniform brick size, clear separation, subtle grid.
• SC-04: Data Range (3/3) - Axes show all data points without clipping.
• SC-05: Legend Accuracy (2/2) - Legend correctly identifies "Bullish (Up)" and "Bearish (Down)".
• SC-06: Title Format (2/2) - Correct format: "renko-basic · highcharts · pyplots.ai".

Data Quality (18/20 pts)

• DQ-01: Feature Coverage (7/8) - Shows both bullish and bearish bricks, trend reversals, support/resistance levels visible. Could show slightly more dramatic trend changes.
• DQ-02: Realistic Context (7/7) - Stock price simulation starting at $100 with realistic daily returns is a neutral, appropriate financial scenario.
• DQ-03: Appropriate Scale (4/5) - Price range of $84-$114 is realistic for a $100 stock over 300 days with $2 brick size.

Code Quality (9/10 pts)

• CQ-01: KISS Structure (3/3) - Linear script with imports → data → plot → save structure.
• CQ-02: Reproducibility (3/3) - Uses np.random.seed(42) for reproducible results.
• CQ-03: Clean Imports (2/2) - All imports are used (numpy, highcharts_core, selenium, etc.).
• CQ-04: No Deprecated API (1/1) - Uses current Highcharts API.
• CQ-05: Output Correct (0/0) - Saves as plot.png correctly.

Library Features (4/5 pts)

• LF-01: Distinctive Features (4/5) - Uses Highcharts-specific features: responsive rules, tooltip customization, columnrange chart type, credits/exporting options, HTML export. Good but not exceptional use of library features.

Strengths

• Excellent colorblind-safe blue/orange palette instead of traditional red/green
• Proper use of columnrange chart type to represent Renko bricks
• Well-configured tooltips showing brick price range
• Includes both PNG and HTML output for interactivity
• Good use of responsive rules for different screen sizes
• Clear visual separation between bricks with borders
• Realistic stock price simulation with appropriate brick size

Weaknesses

• Grid lines on legend markers appear slightly inconsistent with data visualization
• VQ-07 scoring: Legend styling could be slightly more polished (border width/color)

Verdict: APPROVED