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Vector Graphics Showcase Sample

Overview

The Vector Graphics Showcase sample demonstrates:

  • Drawing capabilities — shapes, lines, and paths
  • Custom graphics — data visualization elements
  • Colors and fills — gradient and solid fills
  • Geometry — circles, rectangles, polygons
  • Charts and diagrams — visual data representation
  • Performance — efficient vector rendering

Key Features Demonstrated

1. Basic Shapes

col.Item().Row(row =>
{
    // Rectangle
    row.RelativeItem().Margin(4).Canvas(height: 80, action: (c, area) =>
    {
        c.DrawRectangle(new(area.X, area.Y), 
                       new(area.Right, area.Bottom), 
                       fillColor: "#FF5733");
    }).Border(1);

    // Circle
    row.RelativeItem().Margin(4).Canvas(height: 80, action: (c, area) =>
    {
        decimal centerX = area.X + area.Width / 2;
        decimal centerY = area.Y + area.Height / 2;
        decimal radius = Math.Min(area.Width, area.Height) / 2 - 5;
        
        c.DrawCircle(new(centerX, centerY), radius, 
                    fillColor: "#33FF57");
    }).Border(1);

    // Polygon
    row.RelativeItem().Margin(4).Canvas(height: 80, action: (c, area) =>
    {
        var points = new[]
        {
            new(area.X + area.Width / 2, area.Y + 5),           // Top
            new(area.Right - 5, area.Y + area.Height - 5),      // Bottom right
            new(area.X + 5, area.Y + area.Height - 5)           // Bottom left
        };
        
        c.DrawPolygon(points, fillColor: "#3357FF");
    }).Border(1);
});

2. Lines and Paths

col.Item().Canvas(height: 100, action: (c, area) =>
{
    // Horizontal lines
    c.DrawLine(new(area.X, area.Y + 20), 
              new(area.Right, area.Y + 20), 
              color: "#000000", width: 2);
    
    // Vertical lines
    c.DrawLine(new(area.X + 50, area.Y), 
              new(area.X + 50, area.Bottom), 
              color: "#FF0000", width: 1.5);
    
    // Diagonal line
    c.DrawLine(new(area.X, area.Y), 
              new(area.Right, area.Bottom), 
              color: "#0000FF", width: 1);
}).Border(1, Color.Grey.Lighten2);

3. Bar Chart Visualization

void BarChart(IContainer container, string title, (string Label, decimal Value)[] data)
{
    decimal maxValue = data.Max(x => x.Value);
    
    container.Column(col =>
    {
        col.Item().Text(title).Bold().FontSize(12).FontColor(brand);
        
        col.Item().Canvas(height: 150, action: (c, area) =>
        {
            decimal barWidth = area.Width / (data.Length * 1.5m);
            decimal startX = area.X + 20;
            
            for (int i = 0; i < data.Length; i++)
            {
                decimal barHeight = (data[i].Value / maxValue) * (area.Height - 30);
                decimal x = startX + (i * barWidth * 1.5m);
                decimal y = area.Bottom - 20 - barHeight;
                
                c.DrawRectangle(
                    new(x, y),
                    new(x + barWidth, area.Bottom - 20),
                    fillColor: new[] { "#FF5733", "#33FF57", "#3357FF" }[i % 3]);
            }
        }).Border(1);
        
        col.Item().Row(row =>
        {
            foreach (var (label, _) in data)
            {
                row.RelativeItem().AlignCenter()
                    .Text(label).FontSize(9).FontColor(muted);
            }
        });
    });
}

BarChart(col.Item(), "Quarterly Revenue",
    new[] { ("Q1", 250m), ("Q2", 380m), ("Q3", 320m), ("Q4", 450m) });

4. Pie Chart

void PieChart(IContainer container, string title, (string Label, decimal Value)[] data)
{
    decimal total = data.Sum(x => x.Value);
    
    container.Column(col =>
    {
        col.Item().Text(title).Bold().FontSize(12).FontColor(brand);
        
        col.Item().Canvas(height: 120, action: (c, area) =>
        {
            decimal centerX = area.X + area.Width / 2;
            decimal centerY = area.Y + area.Height / 2;
            decimal radius = Math.Min(area.Width, area.Height) / 2 - 10;
            
            decimal currentAngle = 0;
            string[] colors = { "#FF5733", "#33FF57", "#3357FF", "#FFD700" };
            
            for (int i = 0; i < data.Length; i++)
            {
                decimal sliceAngle = (data[i].Value / total) * 360;
                
                // Draw pie slice (simplified)
                c.DrawArc(new(centerX, centerY), radius, 
                         currentAngle, currentAngle + sliceAngle,
                         strokeColor: colors[i % colors.Length], 
                         width: 1.5);
                
                currentAngle += sliceAngle;
            }
        }).Border(1);
        
        col.Item().Column(legend =>
        {
            foreach (var (label, value) in data)
            {
                decimal pct = (value / total) * 100;
                legend.Item().Text($"● {label}: {pct:F1}%")
                    .FontSize(9).FontColor(muted);
            }
        });
    });
}

PieChart(col.Item(), "Market Share",
    new[] { ("Product A", 35m), ("Product B", 28m), ("Product C", 22m), ("Other", 15m) });

5. Timeline Visualization

col.Item().Canvas(height: 80, action: (c, area) =>
{
    decimal lineY = area.Y + area.Height / 2;
    
    // Main timeline line
    c.DrawLine(new(area.X + 20, lineY), 
              new(area.Right - 20, lineY), 
              color: brand, width: 3);
    
    var events = new[] { ("2023", 0.1m), ("2024", 0.4m), ("2025", 0.7m) };
    
    foreach (var (date, pos) in events)
    {
        decimal x = area.X + 20 + (area.Width - 40) * pos;
        
        // Event circle
        c.DrawCircle(new(x, lineY), 5, fillColor: accent);
        
        // Event label
        c.DrawText(date, new(x - 10, lineY + 15), fontSize: 10);
    }
}).Border(1);

Graphics Features

Drawing Methods

Method Purpose
DrawRectangle() Solid rectangles
DrawCircle() Circles and ellipses
DrawLine() Lines and paths
DrawPolygon() Custom polygons
DrawArc() Curved segments
DrawText() Text in canvas

Customization Options

  • Fill colors — hex colors or Material Design palette
  • Stroke colors — border colors
  • Stroke width — line thickness
  • Positioning — pixel-perfect placement
  • Coordinates — area-relative positioning

Use Cases

Perfect for:

  • Data visualization — charts and graphs
  • Infographics — diagrams and illustrations
  • Timelines — event sequences
  • Organizational charts — hierarchies
  • Floor plans — layout diagrams
  • Technical diagrams — system architecture

What You'll Learn

  1. Canvas drawing — basic graphics operations
  2. Shape creation — rectangles, circles, polygons
  3. Lines and paths — connecting visual elements
  4. Color and styling — fills and strokes
  5. Data visualization — charts and graphs
  6. Coordinate systems — positioning and layout
  7. Performance — efficient rendering

File Output

Generates: 10_vector_graphics_showcase.pdf

Creates a comprehensive showcase of vector graphics capabilities suitable for data visualization, infographics, and technical diagrams.

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