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MainWindow.xaml.cs
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/
MainWindow.xaml.cs
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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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 DrawingQuickstartWPF
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void myCanvas_Loaded(object sender, RoutedEventArgs e)
{
Render();
}
private void Window_SizeChanged(object sender, SizeChangedEventArgs e)
{
Render();
}
private void myCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
Render();
}
Random rand = new Random();
void Render()
{
using (var bmp = new Bitmap((int)myCanvas.ActualWidth, (int)myCanvas.ActualHeight))
using (var gfx = Graphics.FromImage(bmp))
using (var pen = new System.Drawing.Pen(System.Drawing.Color.White))
{
// draw one thousand random white lines on a dark blue background
gfx.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
gfx.Clear(System.Drawing.Color.Navy);
for (int i = 0; i < 1000; i++)
{
var pt1 = new System.Drawing.Point(rand.Next(bmp.Width), rand.Next(bmp.Height));
var pt2 = new System.Drawing.Point(rand.Next(bmp.Width), rand.Next(bmp.Height));
gfx.DrawLine(pen, pt1, pt2);
}
// copy the bitmap to the picturebox
myImage.Source = BmpImageFromBmp(bmp);
}
}
private static BitmapImage BmpImageFromBmp(Bitmap bmp)
{
using (var memory = new System.IO.MemoryStream())
{
bmp.Save(memory, System.Drawing.Imaging.ImageFormat.Png);
memory.Position = 0;
var bitmapImage = new BitmapImage();
bitmapImage.BeginInit();
bitmapImage.StreamSource = memory;
bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
bitmapImage.EndInit();
bitmapImage.Freeze();
return bitmapImage;
}
}
}
}