用户控制OnPaint事件 [英] User Control OnPaint Event

问题描述

我想画一次Image，我在用户控制（Checker）中使用这个图像。

如果有必要，我是发送到project.Please帮助我...



我正在创建一个用户控件（Checker），我在OnPaint Event中使用该代码;

Hi,
I want to draw Image one time and I''m use this Image in User Control(Checker).
If necessary, I''m send to project.Please help me...

I''m create a User Control(Checker), I''m use that code in the OnPaint Event;

protected override void OnPaint(PaintEventArgs e)
{
      base.OnPaint(e);
      Bitmap a = new Bitmap(50, 50);
      Graphics g = e.Graphics;
      using (g = Graphics.FromImage(a))
      {
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.PixelOffsetMode = PixelOffsetMode.HighQuality;
            drawControl(g);
            e.Graphics.DrawImageUnscaled(a, 0, 0);
      }
}
private void drawControl(Graphics g)
{
      Color lightColor = this.DarkColor;
      Color darkColor = this.DarkDarkColor;

      Rectangle paddedRectangle = new Rectangle(this.Padding.Left, this.Padding.Top, this.Width - (this.Padding.Left + this.Padding.Right), this.Height - (this.Padding.Top + this.Padding.Bottom));
      int width = (paddedRectangle.Width < paddedRectangle.Height) ? paddedRectangle.Width : paddedRectangle.Height;
      Rectangle drawRectangle = new Rectangle(paddedRectangle.X, paddedRectangle.Y, width, width);

      // Draw the background ellipse
      if (drawRectangle.Width < 1) drawRectangle.Width = 1;
      if (drawRectangle.Height < 1) drawRectangle.Height = 1;
      g.FillEllipse(new SolidBrush(darkColor), drawRectangle);

      // Draw the glow gradient
      GraphicsPath path = new GraphicsPath();
      path.AddEllipse(drawRectangle);
      PathGradientBrush pathBrush = new PathGradientBrush(path);
      pathBrush.CenterColor = lightColor;
      pathBrush.SurroundColors = new Color[] { Color.FromArgb(150, lightColor) };
      g.FillEllipse(pathBrush, drawRectangle);

      // Set the clip boundary  to the edge of the ellipse
      GraphicsPath gp = new GraphicsPath();
      gp.AddEllipse(drawRectangle);
      g.SetClip(gp);

      // Draw the white reflection gradient
      GraphicsPath path1 = new GraphicsPath();
      Rectangle whiteRect = new Rectangle(drawRectangle.X - Convert.ToInt32(drawRectangle.Width * .15F), drawRectangle.Y - Convert.ToInt32(drawRectangle.Width * .15F), Convert.ToInt32(drawRectangle.Width * .8F), Convert.ToInt32(drawRectangle.Height * .8F));
      path1.AddEllipse(whiteRect);
      PathGradientBrush pathBrush1 = new PathGradientBrush(path);
      pathBrush1.CenterColor = Color.FromArgb(150, 255, 255, 255);
      pathBrush1.SurroundColors = new Color[] { Color.FromArgb(0, 255, 255, 255) };
      g.FillEllipse(pathBrush1, whiteRect);

      // Draw the border
      float w = drawRectangle.Width;
      g.SetClip(this.ClientRectangle);
}

我在My Other User Control（Board）中使用鼠标移动此控件但是，控制正在移动，图形分散。



如何修复它？

我想绘制图像而我正在使用此图像在用户控制（检查器）。

如果有必要，我发送到project.Please帮助我...

I''m move this control with mouse in the My other User Control(Board) but, while this control is moving , graphic is disperse.

How can fix it?
I want to draw Image and I''m use this Image in User Control(Checker).
If necessary, I''m send to project.Please help me...

推荐答案

呼叫移动中 Control.Invalidate ： http://msdn.microsoft.com/en-us/library/system.windows.forms.control.aspx [ ^ ]。



对于某些人解释，请看我过去的答案：

绘制mdi子表单之间的行 [ ^ ]，

< a href =http://www.codeproject.com/Answers/201863/capture-the-drawing-on-a-panel#answer1>捕获面板上的图纸 [ ^ ]，

什么样的俏皮方法是Paint？ （DataGridViewImageCell.Paint（...）） [ ^ ]，

如何加速我的vb.net应用程序？ [ ^ ]。

-SA

Call Control.Invalidate on the move: http://msdn.microsoft.com/en-us/library/system.windows.forms.control.aspx[^].

For some explanations, please see my past answers:
Drawing Lines between mdi child forms[^],
capture the drawing on a panel[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^],
How to speed up my vb.net application?[^].

—SA

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