Image1->Canvas->Brush->Style=bsClear;
  Image1->Canvas->Rectangle(50,50,100,100);

引言: Image1->Canvas->Brush->Style=bsClear; Image1->Canvas->Rectangle(50,50,100,100);[/code]

Image1->Canvas->Pen->Color = clRed;
                Image1->Canvas->Brush->Style = bsClear; [/code]
明明就是BRUSH，卻不能用BRUSH的COLOR，要用PEN才行，怪！    **我很想學，但又很不懂，所以一直問蠢問題，希望不要不屑我的問題，嘻嘻嘻**
        

A brush style determines what pattern the canvas uses to fill shapes. It lets you specify various ways to combine the brushs color with any colors already on the canvas. The predefined styles include solid color, no color, and various line and hatch patterns.
To change the style of a brush, set its Style property to one of the predefined values: bsSolid, bsClear, bsHorizontal, bsVertical, bsFDiagonal, bsBDiagonal, bsCross, or bsDiagCross.    This example sets brush styles by sharing a click-event handler for a set of eight brush-style buttons. All eight buttons are selected, the Object Inspector|Events|OnClick is set, and the OnClick handler is named SetBrushStyle. Here is the handler code:    void __fastcallTForm1::SetBrushStyle(TObject *Sender)    {
  if (Sender == SolidBrush)
    Canvas->Brush->Style = bsSolid;
  else if (Sender == ClearBrush)
    Canvas->Brush->Style = bsClear;
  else if (Sender == HorizontalBrush)
    Canvas->Brush->Style = bsHorizontal;
  else if (Sender == VerticalBrush)
    Canvas->Brush->Style = bsVertical;
  else if (Sender == FDiagonalBrush)
    Canvas->Brush->Style = bsFDiagonal;
  else if (Sender == BDiagonalBrush)
    Canvas->Brush->Style = bsBDiagonal;      else if (Sender == CrossBrush)
    Canvas->Brush->Style = bsCross;
  else if (Sender == DiagCrossBrush)
    Canvas->Brush->Style = bsDiagCross;
}    The above event handler code could be further reduced by putting the brush style constants into the Tag properties of the brush style buttons. Then this event code would be something like:    void __fastcallTForm1::SetBrushStyle(TObject *Sender)    {
   if (Sender->InheritsFrom (__classid(TSpeedButton)) 
    Canvas->Brush->Style = (TBrushStyle) ((TSpeedButton *)Sender)->Tag;
}