canvas->polygon()

[muzhi]

程序如处：
POINT vertices[3];
vertices[0]=Point(0,0);
vertices[1]=Point(0,ClientHeight);
vertices[2]=Point(ClientWidth,ClientHeight);
Canvas->Polygon(vertices,2);

错误提示：
[C++ Error] Unit1.cpp(42): E2034 Cannot convert 'tagPOINT *' to 'const TPoint *'
[C++ Error] Unit1.cpp(42): E2342 Type mismatch in parameter 'Points' (wanted 'const TPoint *', got 'tagPOINT *')

[hdaq]

This example draws a polygon in the specified shape, and fills it with the color teal. Add a paint box component to the form, and assign the following as its OnPaint event handler:

void __fastcall TForm1::PaintBox1Paint(TObject *Sender)

{
Windows::TPoint points[4];
points[0] = Point(10,10);
points[1] = Point(30,10);
points[2] = Point(130,30);
points[3] = Point(240,120);
((TPaintBox *)Sender)->Canvas->Brush->Color = clTeal;
((TPaintBox *)Sender)->Canvas->Polygon(points, 3);

}

[muzhi]

另一问:
void __fastcall TForm1::PenColorClick(Tobject *Sender)
{
Canvas->Pen->Color=PenColor->ForegroundColor;
}

void __fastcall TForm1::Button2Click(TObject *Sender)
{
Canvas->Pen->Width=PenWidth->Position;
PenSize->Caption=IntToStr(PenWidth->Position);
}
错误：
[C++ Error] Unit1.cpp(49): E2451 Undefined symbol 'PenColor'
[C++ Error] Unit1.cpp(55): E2451 Undefined symbol 'PenWidth'
[C++ Error] Unit1.cpp(56): E2451 Undefined symbol 'PenSize'

[muzhi]

有人答吗？

[hdaq]

未定义PenColor、PenWidth、PenSize这三个元件。
你是从哪里拷来的程序吧，别忘了把元件也要一起拷过来啊