نوشته شده توسط
gwbasic
راه بهتر اینه که شما تصویری که قرار نمایش بدین رو اول در یک Bitmap ایجاد کنید
// Double Buffering بافر کردن تصویر کنترل در حال حرکت برای اجرای تکنیک
Bitmap buffer = new Bitmap(pictureBox1.DisplayRectangle.Width
,pictureBox1.DisplayRectangle.Height);
نوشته شده توسط
gwbasic
و سپس اون رو روی فرم Draw کنید.
using (Graphics context = Graphics.FromImage(buffer))
{
// کیفیت ترسیم
context.SmoothingMode = SmoothingMode.HighQuality;
// ترسیم پس زمینه درون بافر
context.DrawImage(this.background, 0, 0);
// PictureBoxترسیم بافر بر روی کنترل
pictureBox1.CreateGraphics().DrawImage(buffer, 0, 0);
}
نوشته شده توسط
gwbasic
پستهای قدیمی من رو جستجو کنید در این موردا توضیح دادم
کد HTML:
https://barnamenevis.org/showthread.php?202784-%D8%A7%D9%81%D8%B2%D8%A7%DB%8C%D8%B4-%D8%B3%D8%B1%D8%B9%D8%AA-%D8%AA%D8%B1%D8%B3%DB%8C%D9%85&highlight=Double+Buffer
================================================== =======
ولی یک روش بهتر و سخت تر دیگه هم هست که این روش کاربردی تره!
کد هاش رو که از سایت MSDN با موضوع BufferedGraphics Class گرفتم اینجا میگذارم لطفا مفهومش رو توضیح بدین و یک مثال کاربردی ازش بزنید و هر کی هر چی می دونه بگه چون این موضوع خیلی کم راجبش بحث شده .
جزء 1
using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
namespace BufferingExample
{
جزء 2
public class BufferingExample : Form
{
private BufferedGraphicsContext context;
private BufferedGraphics grafx;
private byte bufferingMode;
private string[] bufferingModeStrings =
{ "Draw to Form without OptimizedDoubleBufferring control style",
"Draw to Form using OptimizedDoubleBuffering control style",
"Draw to HDC for form" };
private System.Windows.Forms.Timer timer1;
private byte count;
جزء 3
public BufferingExample() : base()
{
جزء 4
// Configure the Form for this example.
this.Text = "User double buffering";
this.MouseDown += new MouseEventHandler(this.MouseDownHandler);
this.Resize += new EventHandler(this.OnResize);
this.SetStyle( ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true );
جزء 5
// Configure a timer to draw graphics updates.
timer1 = new System.Windows.Forms.Timer();
timer1.Interval = 200;
timer1.Tick += new EventHandler(this.OnTimer);
bufferingMode = 2;
count = 0;
جزء 6
// Retrieves the BufferedGraphicsContext for the
// current application domain.
context = BufferedGraphicsManager.Current;
جزء 7
// Sets the maximum size for the primary graphics buffer
// of the buffered graphics context for the application
// domain. Any allocation requests for a buffer larger
// than this will create a temporary buffered graphics
// context to host the graphics buffer.
context.MaximumBuffer = new Size(this.Width+1, this.Height+1);
جزء 8
// Allocates a graphics buffer the size of this form
// using the pixel format of the Graphics created by
// the Form.CreateGraphics() method, which returns a
// Graphics object that matches the pixel format of the form.
grafx = context.Allocate(this.CreateGraphics(),
new Rectangle( 0, 0, this.Width, this.Height ));
جزء 9
// Draw the first frame to the buffer.
DrawToBuffer(grafx.Graphics);
}
جزء 10
private void MouseDownHandler(object sender, MouseEventArgs e)
{
if( e.Button == MouseButtons.Right )
{
جزء 11
// Cycle the buffering mode.
if( ++bufferingMode > 2 )
bufferingMode = 0;
جزء 12
// If the previous buffering mode used
// the OptimizedDoubleBuffering ControlStyle,
// disable the control style.
if( bufferingMode == 1 )
this.SetStyle( ControlStyles.OptimizedDoubleBuffer, true );
جزء 13
// If the current buffering mode uses
// the OptimizedDoubleBuffering ControlStyle,
// enabke the control style.
if( bufferingMode == 2 )
this.SetStyle( ControlStyles.OptimizedDoubleBuffer, false );
جزء 14
// Cause the background to be cleared and redraw.
count = 6;
DrawToBuffer(grafx.Graphics);
this.Refresh();
}
else
{
جزء 15
// Toggle whether the redraw timer is active.
if( timer1.Enabled )
timer1.Stop();
else
timer1.Start();
}
}
جزء 16
private void OnTimer(object sender, EventArgs e)
{
جزء 17
// Draw randomly positioned ellipses to the buffer.
DrawToBuffer(grafx.Graphics);
جزء 18
// If in bufferingMode 2, draw to the form's HDC.
if( bufferingMode == 2 )
جزء 19
// Render the graphics buffer to the form's HDC.
grafx.Render(Graphics.FromHwnd(this.Handle));
جزء 20
// If in bufferingMode 0 or 1, draw in the paint method.
else
this.Refresh();
}
جزء 21
private void OnResize(object sender, EventArgs e)
{
جزء 22
// Re-create the graphics buffer for a new window size.
context.MaximumBuffer = new Size(this.Width+1, this.Height+1);
if( grafx != null )
{
grafx.Dispose();
grafx = null;
}
grafx = context.Allocate(this.CreateGraphics(),
new Rectangle( 0, 0, this.Width, this.Height ));
جزء 23
// Cause the background to be cleared and redraw.
count = 6;
DrawToBuffer(grafx.Graphics);
this.Refresh();
}
جزء 24
private void DrawToBuffer(Graphics g)
{
جزء 25
// Clear the graphics buffer every five updates.
if( ++count > 5 )
{
count = 0;
grafx.Graphics.FillRectangle(Brushes.Black, 0, 0, this.Width, this.Height);
}
جزء 26
// Draw randomly positioned and colored ellipses.
Random rnd = new Random();
for( int i=0; i<20; i++ )
{
int px = rnd.Next(20,this.Width-40);
int py = rnd.Next(20,this.Height-40);
g.DrawEllipse(new Pen(Color.FromArgb(rnd.Next(0, 255), rnd.Next(0,255), rnd.Next(0,255)), 1),
px, py, px+rnd.Next(0, this.Width-px-20), py+rnd.Next(0, this.Height-py-20));
}
جزء 27
// Draw information strings.
g.DrawString("Buffering Mode: "+bufferingModeStrings[bufferingMode], new Font("Arial", 8), Brushes.White, 10, 10);
g.DrawString("Right-click to cycle buffering mode", new Font("Arial", 8), Brushes.White, 10, 22);
g.DrawString("Left-click to toggle timed display refresh", new Font("Arial", 8), Brushes.White, 10, 34);
}
جزء 28
protected override void OnPaint(PaintEventArgs e)
{
grafx.Render(e.Graphics);
}
جزء 29
[STAThread]
public static void Main(string[] args)
{
Application.Run(new BufferingExample());
}
}
}
کد نویسی به روش Double Buffering
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