我如何可以旋转的的RectangleF在使用图形对象特定程度? [英] How can I rotate an RectangleF at a specific degree using Graphics object?

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问题描述

我已经试过这样:

  g.RotateTransform(度);
 

但没有happens.I有一个图形对象,并使用该方法的一个矩形对象女巫IM图:

  g.FillRectangle(新的TextureBrush(Image.FromFile(@D:\ LOVE&放大器; LUA \图片\ yellowWool.png)),矩形);
 

和我需要以某种方式旋转矩形,然后重新绘制。

答与code样品,请与一个简单的解释。

编辑:这是我用实际code:

 公共无效Draw(绘图克,的PointF位置,颜色clearColor)
    {
        rectangle.Location =位置;
        g.Clear(clearColor);
        g.RotateTransform(10);
        //g.FillRectangle(new SolidBrush(彩色),矩形);
        g.FillRectangle(新的TextureBrush(Image.FromFile(@D:\ LOVE&放大器; LUA \图片\ yellowWool.png)),矩形);
    }
 

每个帧我把这种功能,我使用窗体的Paint事件的 e.Graphics 对象的图形和我有一个定时器魔女只要求 this.Refresh();

编辑2: 好吧,我已经打了一个小有和 g.RotateTransform 旋转graphycs整个cordinate系统对象的变换,我需要在不改变cordinate系统

解决方案

您可以尝试使用与 RotateAt 方法的矩阵居中矩形围绕旋转:

 使用(矩阵M =新的Matrix()){
  m.RotateAt(10,新的PointF(rectangle.Left +(rectangle.Width / 2),
                            rectangle.Top +(rectangle.Height / 2)));
  g.Transform =米;
  使用(的TextureBrush TB =新的TextureBrush(Image.FromFile(@D:\ LOVE&放大器; LUA \图片\ yellowWool.png))
    g.FillRectangle(TB,矩形);
  g.ResetTransform();
}
 

ResetTransform()会后把显卡恢复正常处理。

I have tried this:

g.RotateTransform(degrees);

But nothing happens.I have one graphics object and one rectangle object witch im drawing using this method:

g.FillRectangle(new TextureBrush(Image.FromFile(@"D:\LOVE&LUA\Pictures\yellowWool.png")), rectangle);

And i need to rotate the rectangle somehow and draw it again.

Answer with code sample please and with a simple explanation.

EDIT: Here is the actual code I'm using:

        public void Draw(Graphics g,PointF location,Color clearColor)
    {
        rectangle.Location = location;
        g.Clear(clearColor);
        g.RotateTransform(10);
        //g.FillRectangle(new SolidBrush(Color), rectangle);
        g.FillRectangle(new TextureBrush(Image.FromFile(@"D:\LOVE&LUA\Pictures\yellowWool.png")), rectangle);
    }

Each frame I call this function and I'm using form's Paint event's e.Graphics object for the Graphics and i have a timer witch only calls this.Refresh();

EDIT 2: OK I have played a little with the transformations and g.RotateTransform rotates the whole cordinate system of the graphycs object and i need to rotate only the rectangle without changing the cordinate system

解决方案

You can try using a matrix with the RotateAt method to center the rotation around the rectangle:

using (Matrix m = new Matrix()) {
  m.RotateAt(10, new PointF(rectangle.Left + (rectangle.Width / 2),
                            rectangle.Top + (rectangle.Height / 2)));
  g.Transform = m;
  using (TextureBrush tb = new TextureBrush(Image.FromFile(@"D:\LOVE&LUA\Pictures\yellowWool.png"))
    g.FillRectangle(tb, rectangle);
  g.ResetTransform();
}

The ResetTransform() will turn the graphics back to normal processing after that.

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