[Mono-winforms-list] simple animation

[kangaroo]

Jon,

   The problem is currently you need to Flush() any graphics context  
that you use on OSX.  Just add a clientDC.Flush (); after your  
_ball.Draw (); and this will start working.

-kangaroo

On 10-Apr-05, at 1:12 AM, Jon Heiner wrote:

> Is there a problem with the Graphics Device not being invalidated  
> properly? Here is some simple code that animates a sprite moving  
> around. The only way I can see anything is if I toggle the mono window  
> underneath another window, like the Finder. This is adapted from some  
> animation code I picked up that renders to an Image and then uses the  
> Graphic DrawImage call. No matter how I do it, my Form does not  
> invalidate and update on the timer ticks. Any thoughts?
>
> system: MacOSX 10.3.8 w/ mono1.1.5
>
> code:
> _______________________________________________________________________ 
> ___________________________________
> using System;
> using System.Drawing;
> using System.Collections;
> using System.ComponentModel;
> using System.Windows.Forms;
> using System.Runtime.InteropServices;
>
> namespace Bouncy
> {
> 	/ 
> /---------------------------------------------------------------------- 
> --------
> 	// Ball
> 	/ 
> /---------------------------------------------------------------------- 
> --------
> 	public class Ball
> 	{
> 		public Ball( System.Drawing.Size bounds )
> 		{
> 			_armPen   = new Pen(Color.Red, (float)3.0);
> 			_center   = new Point(3,3);
> 			_size     = new Size( bounds.Width + 5, bounds.Height + 5);
> 			_velocity = new Point(1,1);
> 		}
>
> 		// bounce the ball around in a bounded rectangle
> 		public void Update( System.Drawing.Size bounds )
> 		{
> 			_center.X += _velocity.X;
> 			if( _center.X < 0 )             { _center.X = 0; _velocity.X =  
> -_velocity.X; }
> 			if( _center.X > bounds.Width )  { _center.X = bounds.Width;  
> _velocity.X = -_velocity.X; }
> 			_center.Y += _velocity.Y;
> 			if( _center.Y < 0 )             { _center.Y = 0; _velocity.Y =  
> -_velocity.Y; }
> 			if( _center.Y > bounds.Height ) { _center.Y = bounds.Height;  
> _velocity.Y = -_velocity.Y; }
> 		}
>
> 		// draw the 'ball'
> 		public void Draw(Graphics g)
> 		{
> 			g.DrawRectangle( _armPen, new Rectangle( _center, _size) );
> 		}
>
> 		private Color _ballColor;
> 		private Pen   _armPen;
> 		private Size  _size;
> 		private Point _velocity;
> 		private Point _center;
> 	}
>
> 	/ 
> /---------------------------------------------------------------------- 
> --------
> 	// MainForm
> 	/ 
> /---------------------------------------------------------------------- 
> --------
> 	public class MainForm : System.Windows.Forms.Form
> 	{
> 		[STAThread]
> 		static void Main()
> 		{
> 			Application.Run(new MainForm());
> 		}
>
> 		public MainForm()
> 		{
> 			InitializeComponent();
> 		}
>
> 		protected override void Dispose( bool disposing )
> 		{
> 			if( disposing )
> 			{
> 				if (components != null)
> 				{
> 					components.Dispose();
> 				}
> 			}
> 			base.Dispose( disposing );
> 		}
>
> 		private void InitializeComponent()
> 		{
> 			this.components = new System.ComponentModel.Container();
> 			this.timer1 = new System.Windows.Forms.Timer(this.components);
> 			this.drawBox = new System.Windows.Forms.GroupBox();
> 			this.SuspendLayout();
>
> 			// timer1
> 			this.timer1.Enabled = true;
> 			this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
> 			this.timer1.Interval = 1000/60;
>
> 			// drawBox
> 			this.drawBox.Location = new System.Drawing.Point(120, 60);
> 			this.drawBox.Name = "drawBox";
> 			this.drawBox.Size = new System.Drawing.Size(400, 200);
> 			this.drawBox.TabIndex = 3;
> 			this.drawBox.TabStop = false;
> 			this.drawBox.Text = "Drawing Area";
> 			this.drawBox.Visible = false;
>
> 			// MainForm
> 			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
> 			this.BackColor = System.Drawing.Color.LightBlue;
> 			this.ClientSize = new System.Drawing.Size(640, 320);
> 			this.Controls.AddRange(new System.Windows.Forms.Control[] {  
> this.drawBox });
> 			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Fixed3D;
> 			this.MaximizeBox = false;
> 			this.Name = "MainForm";
> 			this.Text = "MainForm";
> 			this.Load += new System.EventHandler(this.OnLoad);
> 			this.ResumeLayout(false);
>
> 		}
>
> 		private void OnLoad(object sender, System.EventArgs e)
> 		{
> 			_ball = new Ball( drawBox.Size );
>
> 			backBrush = new SolidBrush(Color.Black);
>
> 			InitForSimpleDrawing();
> 		}
>
> 		private void timer1_Tick(object sender, System.EventArgs e)
> 		{
> 			// redraw the whole form
> 			_ball.Update( this.drawBox.Size );
> 			DrawSimple();
> 		}
>
> 		private void DrawSimple()
> 		{
> 			Graphics clientDC = this.CreateGraphics();
>
> 			clientDC.FillRectangle(backBrush, drawBox.Left, drawBox.Top,  
> drawBox.Width, drawBox.Height);
> 			_ball.Draw(clientDC);
> 			drawBox.Invalidate();
> 		}
> 		
> 		private System.ComponentModel.IContainer components;
> 		private System.Windows.Forms.Timer       timer1;
>
> 		private System.Windows.Forms.GroupBox    drawBox;
> 		private SolidBrush                       backBrush;
> 		private Ball                             _ball;
> 	}
> }
>
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