.NET (Core and Framework)

"You can have everything in life you want if you will just help enough other people get what they want." --Zig Ziglar

The Second EuroCPian Event will be in Brussels on the 4th of September

Can't manage to P/Invoke that Win32 API in .NET? Why not do interop the wiki way!

<br />
using System;<br />
using System.Windows.Forms;<br />
using System.Drawing;<br />
<br />
namespace LineTest<br />
{<br />
	struct Line<br />
	{<br />
		public int x1, y1, x2, y2;		<br />
		public Color c;<br />
	}<br />
<br />
	/// <summary><br />
	/// Summary description for Lines.<br />
	/// </summary><br />
	public class RandomLinesControl : Control<br />
	{<br />
		int numLines;<br />
		Line[] lines;<br />
<br />
		public RandomLinesControl()<br />
		{<br />
			SetStyle(ControlStyles.AllPaintingInWmPaint<br />
				| ControlStyles.DoubleBuffer<br />
				| ControlStyles.UserPaint, true);<br />
<br />
			NumLines = 5000;<br />
		}<br />
<br />
		protected override void OnResize(EventArgs e)<br />
		{<br />
			base.OnResize (e);<br />
<br />
			CreateLines();<br />
		}<br />
<br />
<br />
		public int NumLines<br />
		{<br />
			get { return numLines; }<br />
			set <br />
			{<br />
				numLines = value;<br />
				CreateLines();<br />
			}<br />
		}<br />
<br />
		void CreateLines()<br />
		{<br />
			Random rand = new Random();<br />
<br />
			lines = new Line[numLines];<br />
			for (int i=0; i<numLines; i++)<br />
			{<br />
				Line line = new Line();<br />
				line.x1 = rand.Next(3, Width > 6 ? Width-3 : 6);<br />
				line.x2 = rand.Next(3, Width > 6 ? Width-3 : 6);<br />
				line.y1 = rand.Next(15, Height > 20 ? Height-3 : 20);<br />
				line.y2 = rand.Next(15, Height > 20 ? Height-3 : 20);<br />
				line.c = Color.FromArgb(rand.Next(255), rand.Next(255), rand.Next(255));<br />
<br />
				lines[i] = line;<br />
			}<br />
<br />
			Invalidate();<br />
		}<br />
<br />
		protected override void OnPaint(PaintEventArgs e)<br />
		{<br />
			int start_t = System.Environment.TickCount;<br />
<br />
			Graphics g = e.Graphics;<br />
			g.Clear(this.BackColor);<br />
			Pen pen = new Pen(this.ForeColor);<br />
<br />
			for (int i=0; i<lines.Length; i++)<br />
			{<br />
				Line line = lines[i];<br />
				pen.Color = line.c;<br />
				g.DrawLine(pen, line.x1, line.y1, line.x2, line.y2);<br />
			}<br />
<br />
			int end_t = System.Environment.TickCount;<br />
			g.DrawString("Drawn " + numLines + " lines in " + (end_t-start_t) + " ms", Font, Brushes.Black, 1, 1);<br />
			<br />
		}<br />
<br />
	}<br />
}<br />
<br />