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    <p>Here's a simple SSCCE. </p> <p>Edit: It might not be precisely what you wanted, now re-reading the question, but perhaps it can give you an idea of how to structure your filling tools. As for pixel-perfection, even MS Paint requires a complete closed drawing, where as other libraries might use degrees of antialias matching to avoid "leaks".</p> <p>XAML:</p> <pre><code>&lt;Window x:Class="FreeformDrawing.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" MouseLeftButtonDown="Window_MouseLeftButtonDown" MouseLeftButtonUp="Window_MouseLeftButtonUp" MouseMove="Window_MouseMove" Title="MainWindow" Height="400" Width="400"&gt; &lt;Grid&gt; &lt;Canvas x:Name="DrawingCanvas" /&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>C#:</p> <pre><code>using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; namespace FreeformDrawing { /// &lt;summary&gt; /// Interaction logic for MainWindow.xaml /// &lt;/summary&gt; public partial class MainWindow : Window { private Polygon polygon; private bool isDrawing = false; public MainWindow() { InitializeComponent(); } public void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e) { if (!isDrawing) { isDrawing = true; polygon = new Polygon() { Stroke = Brushes.Black, StrokeThickness = 1, StrokeMiterLimit = 1, StrokeLineJoin = PenLineJoin.Round, StrokeStartLineCap = PenLineCap.Round, StrokeEndLineCap = PenLineCap.Round }; AddPoint(e.GetPosition(DrawingCanvas)); DrawingCanvas.Children.Add(polygon); } } public void Window_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { isDrawing = false; if (polygon != null) { polygon.Points.Add(polygon.Points.First()); polygon.Fill = Brushes.Yellow; } } public void Window_MouseMove(object sender, MouseEventArgs e) { if (isDrawing) { AddPoint(e.GetPosition(DrawingCanvas)); } } private void AddPoint(Point value) { if (value.X &lt; (DrawingCanvas.ActualWidth - 1) &amp;&amp; value.Y &lt; (DrawingCanvas.ActualHeight - 1)) { polygon.Points.Add(value); } } } } </code></pre>
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    1. POC#, WPF, Visual Studio 4: irregular shape color filling
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    1. USClaus Jørgensen
    1. USClaus Jørgensen
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    1. COThis is good, thanks. However, what if the user created a complex shape. Imagine a hand drawn star created with one stroke (http://mathworld.wolfram.com/images/eps-gif/StarPolygons_650.gif) and the user only wants the center part filled. Likewise, imagine a rectangle that is drawn using 2 strokes. I am more comfortable with Java than C#, please forgive me if I am not right. Thanks again.
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