fix: Resolve chart rendering issues in PowerPoint generation

Cargo.toml

@@ -25,6 +25,9 @@ anyrepair = "0.1"
 clap = { version = "4.5", features = ["derive"] }
 pulldown-cmark = "0.10"
 syntect = "5.2"
+rust_xlsxwriter = "0.92.2"
+# Windows API for language detection (Windows only)
+windows-sys = { version = "0.52", features = ["Win32_System_SystemInformation"], optional = true }
 # Web2PPT dependencies
 reqwest = { version = "0.11", features = ["blocking"], optional = true }
 scraper = { version = "0.18", optional = true }
@@ -33,6 +36,7 @@ url = { version = "2.5", optional = true }
 [features]
 default = ["web2ppt"]
 web2ppt = ["reqwest", "scraper", "url"]
+windows-lang = ["windows-sys"]
 
 [dev-dependencies]
 insta = "1.34"

examples/actual_charts_demo.rs

@@ -0,0 +1,92 @@
+//! Actual chart demonstration with real charts in slides
+
+use ppt_rs::generator::{
+    create_pptx_with_content, SlideContent, SlideLayout,
+    ChartType, ChartSeries, ChartBuilder,
+};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    println!("=== Creating Presentation with Real Charts ===\n");
+
+    // Slide 1: Title
+    let title_slide = SlideContent::new("Real Charts Demo")
+        .add_bullet("This presentation contains actual charts")
+        .add_bullet("Not just text descriptions")
+        .layout(SlideLayout::TitleAndContent);
+
+    // Slide 2: Bar Chart - Actual data
+    let bar_chart = ChartBuilder::new("Quarterly Sales", ChartType::Bar)
+        .categories(vec!["Q1", "Q2", "Q3", "Q4"])
+        .add_series(ChartSeries::new("2023", vec![100.0, 120.0, 140.0, 160.0]))
+        .add_series(ChartSeries::new("2024", vec![110.0, 135.0, 155.0, 180.0]))
+        .position(2675890, 1725930)  // Position on slide (WPS reference)
+        .size(6839585, 3959860)     // Size (WPS reference)
+        .build();
+
+    let bar_slide = SlideContent::new("Bar Chart: Sales Comparison")
+        .add_chart(bar_chart)
+        .add_bullet("2024 shows consistent growth over 2023")
+        .add_bullet("Q4 is the strongest quarter");
+
+    // Slide 3: Line Chart - Trend analysis
+    let line_chart = ChartBuilder::new("Monthly Revenue Trend", ChartType::Line)
+        .categories(vec!["Jan", "Feb", "Mar", "Apr", "May", "Jun"])
+        .add_series(ChartSeries::new("Revenue (K$)", vec![50.0, 55.0, 62.0, 58.0, 68.0, 75.0]))
+        .position(2675890, 1725930)
+        .size(6839585, 3959860)
+        .build();
+
+    let line_slide = SlideContent::new("Line Chart: Revenue Trend")
+        .add_chart(line_chart)
+        .add_bullet("Steady upward trend from January to June")
+        .add_bullet("Peak in June: $75K");
+
+    // Slide 4: Pie Chart - Market share
+    let pie_chart = ChartBuilder::new("Market Share Distribution", ChartType::Pie)
+        .categories(vec!["Product A", "Product B", "Product C", "Others"])
+        .add_series(ChartSeries::new("Share %", vec![35.0, 28.0, 22.0, 15.0]))
+        .position(2675890, 1725930)
+        .size(6839585, 3959860)  // Use standard WPS reference coordinates
+        .build();
+
+    let pie_slide = SlideContent::new("Pie Chart: Market Share")
+        .add_chart(pie_chart)
+        .add_bullet("Product A leads with 35% market share")
+        .add_bullet("Top 3 products account for 85% of market");
+
+    // Slide 5: Scatter Chart - Correlation analysis
+    let scatter_chart = ChartBuilder::new("Price vs Sales Correlation", ChartType::Scatter)
+        .categories(vec!["10", "20", "30", "40", "50", "60"])  // Price points
+        .add_series(ChartSeries::new("Product Sales", vec![150.0, 120.0, 90.0, 75.0, 60.0, 45.0]))  // Sales volume
+        .position(2675890, 1725930)
+        .size(6839585, 3959860)
+        .build();
+
+    let scatter_slide = SlideContent::new("Scatter Chart: Price vs Sales")
+        .add_chart(scatter_chart)
+        .add_bullet("Higher price correlates with lower sales volume")
+        .add_bullet("Optimal price point appears to be around $10-20");
+
+    let slides = vec![
+        title_slide,
+        bar_slide,
+        line_slide,
+        pie_slide,
+        scatter_slide,
+    ];
+
+    // Generate the PPTX file
+    let pptx_data = create_pptx_with_content("Real Charts Demo", slides.clone())?;
+    std::fs::write("real_charts_demo.pptx", pptx_data)?;
+
+    println!("✓ Created real_charts_demo.pptx with:");
+    println!("  - Title slide");
+    println!("  - Bar chart: Quarterly sales comparison");
+    println!("  - Line chart: Monthly revenue trend");
+    println!("  - Pie chart: Market share distribution");
+    println!("  - Scatter chart: Price vs Sales correlation");
+    println!("\nTotal slides: {}", slides.len());
+    println!("\nNote: Check if charts are visible in the generated PPTX file");
+
+    Ok(())
+}