pulsedock/src/PulseDock.App/Controls/SparklineControl.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows;
using System.Windows.Media;
using Brush = System.Windows.Media.Brush;
using Brushes = System.Windows.Media.Brushes;
using Pen = System.Windows.Media.Pen;
using Point = System.Windows.Point;

namespace PulseDock.App.Controls
{
    public class SparklineControl : FrameworkElement
    {
        public static readonly DependencyProperty ValuesProperty =
            DependencyProperty.Register(
                nameof(Values),
                typeof(IEnumerable<float>),
                typeof(SparklineControl),
                new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.AffectsRender));

        public static readonly DependencyProperty LineColorProperty =
            DependencyProperty.Register(
                nameof(LineColor),
                typeof(Brush),
                typeof(SparklineControl),
                new FrameworkPropertyMetadata(Brushes.Cyan, FrameworkPropertyMetadataOptions.AffectsRender));

        public static readonly DependencyProperty LineThicknessProperty =
            DependencyProperty.Register(
                nameof(LineThickness),
                typeof(double),
                typeof(SparklineControl),
                new FrameworkPropertyMetadata(1.5, FrameworkPropertyMetadataOptions.AffectsRender));

        public IEnumerable<float>? Values
        {
            get => (IEnumerable<float>?)GetValue(ValuesProperty);
            set => SetValue(ValuesProperty, value);
        }

        public Brush LineColor
        {
            get => (Brush)GetValue(LineColorProperty);
            set => SetValue(LineColorProperty, value);
        }

        public double LineThickness
        {
            get => (double)GetValue(LineThicknessProperty);
            set => SetValue(LineThicknessProperty, value);
        }

        protected override void OnRender(DrawingContext drawingContext)
        {
            base.OnRender(drawingContext);

            var values = Values?.ToArray();
            if (values == null || values.Length < 2 || ActualWidth <= 0 || ActualHeight <= 0)
                return;

            double width = ActualWidth;
            double height = ActualHeight;

            float min = 0f;
            float max = 100f; // Scale percentage or range dynamically
            float actualMax = values.Max();
            if (actualMax > 100f) max = actualMax;

            var geometry = new StreamGeometry();
            using (var ctx = geometry.Open())
            {
                double stepX = width / (values.Length - 1);

                for (int i = 0; i < values.Length; i++)
                {
                    double x = i * stepX;
                    float val = Math.Clamp(values[i], min, max);
                    double normY = (val - min) / (max - min);
                    double y = height - (normY * (height - 4)) - 2;

                    var point = new Point(x, y);

                    if (i == 0)
                        ctx.BeginFigure(point, isFilled: false, isClosed: false);
                    else
                        ctx.LineTo(point, isStroked: true, isSmoothJoin: true);
                }
            }

            geometry.Freeze();
            var pen = new Pen(LineColor, LineThickness);
            pen.Freeze();
            drawingContext.DrawGeometry(null, pen, geometry);
        }
    }
}