如何避免闪烁使用绘画方法在面板上绘制矩形？
问题描述：
public Form1()
{
InitializeComponent();
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.UserMouse, true);
}
private void Form1_Load(object sender, EventArgs e)
{
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
//this.SetStyle(ControlStyles.UserPaint, true);
//this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
//this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.DoubleBuffered = true;
Rect1LT.Width = 10;
Rect1LT.Height = 10;
Rect1L.Width = 10;
Rect1L.Height = 10;
Rect1RT.Width = 10;
Rect1RT.Height = 10;
Rect1B.Width = 10;
Rect1B.Height = 10;
Rect1RB.Width = 10;
Rect1RB.Height = 10;
Rect1R.Width = 10;
Rect1R.Height = 10;
Rect1LB.Width = 10;
Rect1LB.Height = 10;
Rect1T.Width = 10;
Rect1T.Height = 10;
Rect1.X = panel1.Location.X + 50;
Rect1.Y = panel1.Location.Y + 50;
Rect1.Width = 100;
Rect1.Height = 100;
Rect1LT.X = Rect1.X - 5;
Rect1LT.Y = Rect1.Y - 5;
Rect1RT.X = Rect1.X - 5 + Rect1.Width;
Rect1RT.Y = Rect1.Y - 5;
Rect1LB.X = Rect1.X - 5;
Rect1LB.Y = Rect1.Y - 5 + Rect1.Height;
Rect1RB.X = Rect1.X - 5 + Rect1.Width;
Rect1RB.Y = Rect1.Y - 5 + Rect1.Height;
Rect1T.X = Rect1.X - 5 + (Rect1.Width/2);
Rect1T.Y = Rect1.Y - 5;
Rect1B.X = Rect1.X - 5 + (Rect1.Width/2);
Rect1B.Y = Rect1.Y - 5 + Rect1.Height;
Rect1L.X = Rect1.X - 5;
Rect1L.Y = Rect1.Y - 5 + (Rect1.Height/2);
Rect1R.X = Rect1.X - 5 + Rect1.Width;
Rect1R.Y = Rect1.Y - 5 + (Rect1.Height/2);
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
Pen mypen = default(Pen);
mypen = new Pen(System.Drawing.Color.Red, 3);
mypen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
//For Dash Line in Rectangle
Pen mypen1 = default(Pen);
mypen1 = new Pen(System.Drawing.Color.Blue, 1);
mypen1.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
L1 = Rect1LT.X + 5;
T1 = Rect1LT.Y + 5;
W1 = Rect1RB.X - Rect1LT.X;
H1 = Rect1RB.Y - Rect1LT.Y;
e.Graphics.DrawRectangle(mypen, new System.Drawing.Rectangle(L1, T1, W1, H1));
e.Graphics.DrawRectangle(mypen1, new System.Drawing.Rectangle(L1, T1, W1, H1));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1LT.X, Rect1LT.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1RT.X, Rect1RT.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1LB.X, Rect1LB.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1RB.X, Rect1RB.Y, 10, 10));
e.Graphics.FillRectangle(Brushes.Blue, Rect1LT);
e.Graphics.FillRectangle(Brushes.Blue, Rect1RT);
e.Graphics.FillRectangle(Brushes.Blue, Rect1LB);
e.Graphics.FillRectangle(Brushes.Blue, Rect1RB);
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1T.X, Rect1T.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1R.X, Rect1R.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1B.X, Rect1B.Y, 10, 10));
e.Graphics.DrawRectangle(Pens.Blue, new System.Drawing.Rectangle(Rect1L.X, Rect1L.Y, 10, 10));
e.Graphics.FillRectangle(Brushes.Blue, Rect1T);
e.Graphics.FillRectangle(Brushes.Blue, Rect1R);
e.Graphics.FillRectangle(Brushes.Blue, Rect1B);
e.Graphics.FillRectangle(Brushes.Blue, Rect1L);
}
int L1;
int T1;
int W1;
int H1;
bool flg1_LT = false;
bool flg1_RT = false;
bool flg1_LB = false;
bool flg1_RB = false;
bool flg1_mid = false;
bool flg1_T = false;
bool flg1_B = false;
bool flg1_L = false;
bool flg1_R = false;
public System.Drawing.Rectangle Rect1;
public System.Drawing.Rectangle Rect1LT;
public System.Drawing.Rectangle Rect1RT;
public System.Drawing.Rectangle Rect1LB;
public System.Drawing.Rectangle Rect1RB;
public System.Drawing.Rectangle Rect1T;
public System.Drawing.Rectangle Rect1B;
public System.Drawing.Rectangle Rect1L;
public System.Drawing.Rectangle Rect1R;
public Point Point1LT;
public Point Point1RT;
public Point Point1LB;
public Point Point1RB;
public Point Point1L;
public Point Point1T;
public Point Point1R;
public Point Point1B;
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Location.X >= Rect1LT.X & e.Location.Y >= Rect1LT.Y & e.Location.X <= (Rect1LT.X + 10) & e.Location.Y <= (Rect1LT.Y + 10))
{
flg1_LT = true;
}
else if (e.Location.X >= Rect1RT.X & e.Location.Y >= Rect1RT.Y & e.Location.X <= (Rect1RT.X + 10) & e.Location.Y <= (Rect1RT.Y + 10))
{
flg1_RT = true;
}
else if (e.Location.X >= Rect1LB.X & e.Location.Y >= Rect1LB.Y & e.Location.X <= (Rect1LB.X + 10) & e.Location.Y <= (Rect1LB.Y + 10))
{
flg1_LB = true;
}
else if (e.Location.X >= Rect1RB.X & e.Location.Y >= Rect1RB.Y & e.Location.X <= (Rect1RB.X + 10) & e.Location.Y <= (Rect1RB.Y + 10))
{
flg1_RB = true;
}
else if (e.Location.X >= Rect1B.X & e.Location.Y >= Rect1B.Y & e.Location.X <= (Rect1B.X + 10) & e.Location.Y <= (Rect1B.Y + 10))
{
flg1_B = true;
}
else if (e.Location.X >= Rect1R.X & e.Location.Y >= Rect1R.Y & e.Location.X <= (Rect1R.X + 10) & e.Location.Y <= (Rect1R.Y + 10))
{
flg1_R = true;
}
else if (e.Location.X >= Rect1T.X & e.Location.Y >= Rect1T.Y & e.Location.X <= (Rect1T.X + 10) & e.Location.Y <= (Rect1T.Y + 10))
{
flg1_T = true;
}
else if (e.Location.X >= Rect1L.X & e.Location.Y >= Rect1L.Y & e.Location.X <= (Rect1L.X + 10) & e.Location.Y <= (Rect1L.Y + 10))
{
flg1_L = true;
}
else if (e.Location.X >= (Rect1LT.X + 10) & e.Location.Y >= (Rect1LT.Y + 10) & e.Location.X <= (Rect1RB.X + 10) & e.Location.Y <= (Rect1RB.Y + 10))
{
flg1_mid = true;
temp1X = e.Location.X;
temp1Y = e.Location.Y;
Point1L.X = Rect1L.X;
Point1T.X = Rect1T.X;
Point1B.X = Rect1B.X;
Point1R.X = Rect1R.X;
Point1L.Y = Rect1L.Y;
Point1T.Y = Rect1T.Y;
Point1B.Y = Rect1B.Y;
Point1R.Y = Rect1R.Y;
Point1LT.X = Rect1LT.X;
Point1LB.X = Rect1LB.X;
Point1RT.X = Rect1RT.X;
Point1RB.X = Rect1RB.X;
Point1LT.Y = Rect1LT.Y;
Point1LB.Y = Rect1LB.Y;
Point1RT.Y = Rect1RT.Y;
Point1RB.Y = Rect1RB.Y;
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeAll;
}
}
int temp1X;
int temp1Y;
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
System.Drawing.Rectangle Rect_TEMP1 = default(System.Drawing.Rectangle);
System.Drawing.Rectangle Rect_TEMP2 = default(System.Drawing.Rectangle);
System.Drawing.Rectangle Rect_TEMP3 = default(System.Drawing.Rectangle);
System.Drawing.Rectangle Rect_TEMP4 = default(System.Drawing.Rectangle);
System.Drawing.Rectangle Rect_TEMP5 = default(System.Drawing.Rectangle);
System.Drawing.Rectangle Rect_TEMP6 = default(System.Drawing.Rectangle);
if (e.Button == MouseButtons.Left)
{
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
if (flg1_LT)
{
if (e.Location.X > Rect1LT.X)
{
Rect1LT.X = e.Location.X;
Rect1LB.X = e.Location.X;
Rect1L.X = e.Location.X;
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y > Rect1LT.Y)
{
Rect1LT.Y = e.Location.Y;
Rect1RT.Y = e.Location.Y;
Rect1T.Y = e.Location.Y;
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
if (e.Location.X < Rect1LT.X)
{
Rect1LT.X = e.Location.X;
Rect1LB.X = e.Location.X;
Rect1L.X = e.Location.X;
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y < Rect1LT.Y)
{
Rect1LT.Y = e.Location.Y;
Rect1RT.Y = e.Location.Y;
Rect1T.Y = e.Location.Y;
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
}
else if (flg1_RT)
{
if (e.Location.X > Rect1RT.X)
{
Rect1RT.X = e.Location.X;
Rect1RB.X = e.Location.X;
Rect1R.X = e.Location.X;
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y > Rect1RT.Y)
{
Rect1RT.Y = e.Location.Y;
Rect1LT.Y = e.Location.Y;
Rect1T.Y = e.Location.Y;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
if (e.Location.X < Rect1RT.X)
{
Rect1RT.X = e.Location.X;
Rect1RB.X = e.Location.X;
Rect1R.X = e.Location.X;
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y < Rect1RT.Y)
{
Rect1RT.Y = e.Location.Y;
Rect1LT.Y = e.Location.Y;
Rect1T.Y = e.Location.Y;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
}
else if (flg1_LB)
{
if (e.Location.X > Rect1LB.X)
{
Rect1LB.X = e.Location.X;
Rect1LT.X = e.Location.X;
Rect1L.X = e.Location.X;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y > Rect1LB.Y)
{
Rect1LB.Y = e.Location.Y;
Rect1RB.Y = e.Location.Y;
Rect1B.Y = e.Location.Y;
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
if (e.Location.X < Rect1LB.X)
{
Rect1LB.X = e.Location.X;
Rect1LT.X = e.Location.X;
Rect1L.X = e.Location.X;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y < Rect1LB.Y)
{
Rect1LB.Y = e.Location.Y;
Rect1RB.Y = e.Location.Y;
Rect1B.Y = e.Location.Y;
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
}
else if (flg1_RB)
{
if (e.Location.X > Rect1RB.X)
{
Rect1RB.X = e.Location.X;
Rect1RT.X = e.Location.X;
Rect1R.X = e.Location.X;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y > Rect1RB.Y)
{
Rect1RB.Y = e.Location.Y;
Rect1LB.Y = e.Location.Y;
Rect1B.Y = e.Location.Y;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
if (e.Location.X < (Rect1RB.X + 10))
{
Rect1RB.X = e.Location.X;
Rect1RT.X = e.Location.X;
Rect1R.X = e.Location.X;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
}
if (e.Location.Y < (Rect1RB.Y + 10))
{
Rect1RB.Y = e.Location.Y;
Rect1LB.Y = e.Location.Y;
Rect1B.Y = e.Location.Y;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
}
}
else if (flg1_B)
{
if (e.Location.Y > Rect1B.Y)
{
Rect1B.Y = e.Location.Y;
Rect1LB.Y = e.Location.Y;
Rect1RB.Y = e.Location.Y;
}
if (e.Location.Y < (Rect1B.Y + 10))
{
Rect1B.Y = e.Location.Y;
Rect1LB.Y = e.Location.Y;
Rect1RB.Y = e.Location.Y;
}
}
else if (flg1_T)
{
if (e.Location.Y > Rect1T.Y)
{
Rect1T.Y = e.Location.Y;
Rect1LT.Y = e.Location.Y;
Rect1RT.Y = e.Location.Y;
}
if (e.Location.Y < (Rect1T.Y + 10))
{
Rect1T.Y = e.Location.Y;
Rect1LT.Y = e.Location.Y;
Rect1RT.Y = e.Location.Y;
}
}
else if (flg1_R)
{
if (e.Location.X > Rect1R.X)
{
Rect1R.X = e.Location.X;
Rect1RT.X = e.Location.X;
Rect1RB.X = e.Location.X;
}
if (e.Location.X < (Rect1R.X + 10))
{
Rect1R.X = e.Location.X;
Rect1RT.X = e.Location.X;
Rect1RB.X = e.Location.X;
}
}
else if (flg1_L)
{
if (e.Location.X > Rect1L.X)
{
Rect1L.X = e.Location.X;
Rect1LT.X = e.Location.X;
Rect1LB.X = e.Location.X;
}
if (e.Location.X < (Rect1L.X + 10))
{
Rect1L.X = e.Location.X;
Rect1LT.X = e.Location.X;
Rect1LB.X = e.Location.X;
}
}
else if (flg1_mid)
{
Rect1LT.X = Point1LT.X + (e.Location.X - temp1X);
Rect1RT.X = Point1RT.X + (e.Location.X - temp1X);
Rect1LB.X = Point1LB.X + (e.Location.X - temp1X);
Rect1RB.X = Point1RB.X + (e.Location.X - temp1X);
Rect1LT.Y = Point1LT.Y + (e.Location.Y - temp1Y);
Rect1RT.Y = Point1RT.Y + (e.Location.Y - temp1Y);
Rect1LB.Y = Point1LB.Y + (e.Location.Y - temp1Y);
Rect1RB.Y = Point1RB.Y + (e.Location.Y - temp1Y);
Rect1L.X = Point1L.X + (e.Location.X - temp1X);
Rect1R.X = Point1R.X + (e.Location.X - temp1X);
Rect1B.X = Point1B.X + (e.Location.X - temp1X);
Rect1T.X = Point1T.X + (e.Location.X - temp1X);
Rect1L.Y = Point1L.Y + (e.Location.Y - temp1Y);
Rect1R.Y = Point1R.Y + (e.Location.Y - temp1Y);
Rect1B.Y = Point1B.Y + (e.Location.Y - temp1Y);
Rect1T.Y = Point1T.Y + (e.Location.Y - temp1Y);
}
Rect1T.X = ((Rect1LT.X + Rect1RB.X)/2);
Rect1L.Y = (Rect1LT.Y + Rect1LB.Y)/2;
Rect1R.Y = (Rect1LT.Y + Rect1LB.Y)/2;
Rect1B.X = ((Rect1LT.X + Rect1RB.X)/2);
if (Rect1LT.X > Rect1RT.X)
{
Rect_TEMP1 = Rect1RT;
Rect_TEMP2 = Rect1R;
Rect_TEMP3 = Rect1RB;
Rect1RT = Rect1LT;
Rect1R = Rect1L;
Rect1RB = Rect1LB;
Rect1LT = Rect_TEMP1;
Rect1L = Rect_TEMP2;
Rect1LB = Rect_TEMP3;
}
if (Rect1LT.Y > Rect1LB.Y)
{
Rect_TEMP4 = Rect1LB;
Rect_TEMP5 = Rect1B;
Rect_TEMP6 = Rect1RB;
Rect1LB = Rect1LT;
Rect1B = Rect1T;
Rect1RB = Rect1RT;
Rect1LT = Rect_TEMP4;
Rect1T = Rect_TEMP5;
Rect1RT = Rect_TEMP6;
}
this.DoubleBuffered= true;
this.SetStyle(ControlStyles.UserPaint |
ControlStyles.AllPaintingInWmPaint |
ControlStyles.ResizeRedraw |
ControlStyles.ContainerControl |
ControlStyles.OptimizedDoubleBuffer |
ControlStyles.SupportsTransparentBackColor
, true);
panel1.Invalidate();
//public void Invalidate(Rectangle);
//panel1.Update();
//panel1.Refresh();
//panel1.Invalidate(Rect1T);
//invalidateRect(Rect_TEMP1);
//panel1.Invalidate(Rect_TEMP1);
//panel1.Invalidate(Rect_TEMP2);
//panel1.Invalidate(Rect_TEMP3);
//panel1.Invalidate(Rect_TEMP4);
//panel1.Invalidate(Rect_TEMP5);
//panel1.Invalidate(Rect_TEMP6);
//panel1.Invalidate(Rect1);
//panel1.Invalidate(Rect1B);
//Invalidate(Rect1L, true);
//Invalidate(Rect_TEMP1,true);
//panel1.Invalidate(Rect1LB);
//panel1.Invalidate(Rect1LT);
//panel1.Invalidate(Rect1R);
//panel1.Invalidate(Rect1RB);
//panel1.Invalidate(Rect1T);
//panel1.Invalidate(Rect1RT);
//panel1.Invalidate(Rect);
}
if (e.Location.X >= Rect1LT.X & e.Location.Y >= Rect1LT.Y & e.Location.X <= (Rect1LT.X + 10) & e.Location.Y <= (Rect1LT.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNWSE;
}
else if (e.Location.X >= Rect1RT.X & e.Location.Y >= Rect1RT.Y & e.Location.X <= (Rect1RT.X + 10) & e.Location.Y <= (Rect1RT.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNESW;
}
else if (e.Location.X >= Rect1LB.X & e.Location.Y >= Rect1LB.Y & e.Location.X <= (Rect1LB.X + 10) & e.Location.Y <= (Rect1LB.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNESW;
}
else if (e.Location.X >= Rect1RB.X & e.Location.Y >= Rect1RB.Y & e.Location.X <= (Rect1RB.X + 10) & e.Location.Y <= (Rect1RB.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNWSE;
}
else if (e.Location.X >= Rect1B.X & e.Location.Y >= Rect1B.Y & e.Location.X <= (Rect1B.X + 10) & e.Location.Y <= (Rect1B.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNS;
}
else if (e.Location.X >= Rect1R.X & e.Location.Y >= Rect1R.Y & e.Location.X <= (Rect1R.X + 10) & e.Location.Y <= (Rect1R.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeWE;
}
else if (e.Location.X >= Rect1T.X & e.Location.Y >= Rect1T.Y & e.Location.X <= (Rect1T.X + 10) & e.Location.Y <= (Rect1T.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeNS;
}
else if (e.Location.X >= Rect1L.X & e.Location.Y >= Rect1L.Y & e.Location.X <= (Rect1L.X + 10) & e.Location.Y <= (Rect1L.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeWE;
}
else if (e.Location.X >= (Rect1LT.X + 10) & e.Location.Y >= (Rect1LT.Y + 10) & e.Location.X <= (Rect1RB.X + 10) & e.Location.Y <= (Rect1RB.Y + 10))
{
this.panel1.Cursor = System.Windows.Forms.Cursors.SizeAll;
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
flg1_LB = false;
flg1_LT = false;
flg1_RB = false;
flg1_RT = false;
temp1X = 0;
temp1Y = 0;
flg1_B = false;
flg1_L = false;
flg1_R = false;
flg1_T = false;
flg1_mid = false;
}
}
如上所示我绘制矩形，它会导致面板上闪烁？ 我也设置双缓冲属性为true，但仍然是零。 我在面板中设置背景图像，图像属性设置为拉伸，如果图像属性是平铺，它不闪烁。 我应该做什么改变以避免闪烁。如何避免闪烁使用绘画方法在面板上绘制矩形？
答
设置DoubleBuffered属性不是防止闪烁的魔法。 该属性只允许一次渲染绘制的曲面，而不是直接渲染渐变，您首先将所有图形绘制到缓冲区中。然后将其交换到要绘制的有效表面。这对你来说是透明的，但这仅仅是一件事。
如果你仍然有闪烁，你可能会错误地访问你正在绘制的表面。
有在您的程序驱动的图形操作的方式主要有两种：
- 活动消息队列
- 游戏循环
的事件消息队列当图形是主要用于在由用户或系统触发的动作时更新。点击鼠标，系统通知，按下键盘按键，... 这是事件驱动的，等待新事件是阻止操作。因此，在处理cpu的每个事件之间可能有足够的时间执行其他操作。这就是说，如果事件速度低于绘制到曲面所需的时间，则可以执行一些图形操作，而不会出现太多的性能命中（因此闪烁）。
while (!exit)
{
var msg = WaitForMessage(); // Blocks until message arrives
switch (msg.Type)
{
case Message.MouseMove: OnMouseMove(msg); break;
case Message.Paint: OnPaint(msg); break;
...
}
}
来源：opentk
的游戏循环是一个更好的方法，当你需要不断地画上的图形表面和/或图形无需用户交互进行更新。
while (!exit)
{
var time = GetTime();
Update(time);
Render(time);
}
来源：opentk
用这种方法执行非阻塞操作，因此必须处理空闲CPU时间，其他应用程序或你会被消耗的CPU时间的100％。 这是FPS控制的基础。
您的代码正在使用第一种方法，因为在每次鼠标移动事件后，您都会使绘制的曲面无效并请求图形更新。
这不是一个好方法，因为与执行绘图所用的时间相比，鼠标移动事件可能会更快。这可能会降低UI的响应速度。
你可以考虑以下几点工作：
- 减少您的图形更新所需的时间：
- 避免在你的绘制操作堆新对象的实例化系统。尝试重新使用固定实例。设置一次使用的样式和颜色。没有必要一遍又一遍地重复它。
- 打破了鼠标移动和图形失效之间的联系：
- 尝试创建一个游戏循环，你的来电无效将在众所周知率独立的鼠标移动事件来进行。这将使您能够控制FPS。
- 的Invalidate只需要采取什么无效：
- 您可以通过重绘只需要执行何种获得性能。
使方法无效，接受描述将在绘画方法上重绘的区域的矩形。这将避免总是重绘不变的像素。
- 您可以通过重绘只需要执行何种获得性能。
所有这些行动将提高性能和减少闪烁的效果。
我没有仔细看过你的场景，但在构造函数中的SetStyle（）调用之后尝试调用'UpdateStyles（）;'。 – 2014-12-02 16:26:10
我尝试过，但仍然闪烁。 – 2014-12-03 04:34:34