WPF GDI+画图

文章内的代码主要是介绍了如何通过GDI+的方式在WPF中进行画图。

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

private System.Drawing.Image bitmap = null;

private MemoryStream mos = null;

private int lastX = -1;

private double lastY = -1;

Thread t = null;

public MainWindow()

{

mos = new MemoryStream();

InitializeComponent();

bitmap = new Bitmap(800,600) ;

t = new Thread(CreateDataAndDraw);

t.IsBackground = true;

t.Start();

this.img.MouseDown += img_MouseDown;

this.img.MouseUp += img_MouseUp;

}

void img_MouseUp(object sender, MouseButtonEventArgs e)

{

locker.Set();

}

void img_MouseDown(object sender, MouseButtonEventArgs e)

{

locker.Reset();

}

public static ManualResetEvent locker = new ManualResetEvent(true);

public void CreateDataAndDraw()

{

while (true)

{

Thread.Sleep(10);

locker.WaitOne();

double y = new Random().NextDouble() * 200 + 200;

this.Dispatcher.Invoke(() =>

{

DrawTest(lastX+5, y);

});

lastX += 5;

lastY = y;

locker.Set();

}

}

public void DrawTest(int pointX, double pointY)

{

Graphics g = Graphics.FromImage(bitmap);

g.DrawLine(Pens.AliceBlue, new PointF(lastX, (float)lastY), new PointF(pointX, (float)pointY));

g.Save();

bitmap.Save(mos, ImageFormat.Bmp);

BitmapImage bitmapImage = new BitmapImage();

bitmapImage.BeginInit();

bitmapImage.StreamSource = mos;

bitmapImage.EndInit();

img.Source = bitmapImage;

}

}