Rotation Sample

Rotation Sample

Submitted By

User Level

Date of Submission

John O扗onnell

Intermediate

04/24/2001

Download Exe: 6 KB
Description of the Article
After reading Mike Golds article on transforms I thought I would get things moving a bit!
Overriding the OnPaint method and using the Timer class allows us to create a simple animation where we rotate a line around a central point.
Anyone want to create an asteroids clone in C#? J
  
Source Code:

using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Drawing2D; namespace Rotationb2 {       /// <summary>       /// Summary description for Form1.       /// </summary>       public class Form1 : System.Windows.Forms.Form       {             private System.Windows.Forms.Timer timer1;             private System.ComponentModel.IContainer components;             public float f=0;             public Form1()             {                   //                   // Required for Windows Form Designer support                   //                   InitializeComponent();                   //                   // TODO: Add any constructor code after InitializeComponent call                 //             }             /// <summary>             /// Clean up any resources being used.             /// </summary>             protected override void Dispose( bool disposing )             {                   if( disposing )                   {                         if (components != null)                         {                               components.Dispose();                         }                   }                   base.Dispose( disposing );             }                #region Windows Form Designer generated code             /// <summary>             /// Required method for Designer support - do not modify             /// the contents of this method with the code editor.             /// </summary>             private void InitializeComponent()             {                   this.components = new System.ComponentModel.Container();                   this.timer1 = new System.Windows.Forms.Timer(this.components);                   //                   // timer1                   //                   this.timer1.Enabled = true;                   this.timer1.Interval = 50;                   this.timer1.Tick += new System.EventHandler(this.timer1_Tick);                   //                   // Form1                   //                   this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);                   this.ClientSize = new System.Drawing.Size(240, 221);                   this.Name = "Form1";                   this.Text = "Rotationb2";              }             #endregion              /// <summary>             /// The main entry point for the application.             /// </summary>             [STAThread]             static void Main ()             {                   Application.Run(new Form1());             }             protected override void OnPaint(PaintEventArgs e)             {                   e.Graphics.DrawEllipse(Pens.Red,0,0,220,220);                   GraphicsPath gp = new GraphicsPath();                   gp.AddLine(30,30,110,110);                   Matrix RotationTransform = new Matrix(1,0, 0,1,1,1);  // rotation matrix                   PointF TheRotationPoint = new PointF(110.0f, 110.0f);  // rotation point                   RotationTransform.RotateAt(f, TheRotationPoint);                   gp.Transform(RotationTransform);                   e.Graphics.DrawPath(Pens.Blue, gp);                   f=f+10;                   if (f==360)                   f=0;                           }              private void timer1_Tick(object sender, System.EventArgs e)             {                   //force client window to be refreshed                   this.Refresh();             }       } }

原文转自：http://www.ltesting.net