TCanvas 的类成员

//过程:
Arc
BrushCopy
Chord
CopyRect
Draw
DrawFocusRect
Ellipse
Ellipse
FillRect
FloodFill
FrameRect
LineTo
Lock
MoveTo
Pie
Polygon
Polyline
PolyBezier
PolyBezierTo
Rectangle
Rectangle
Refresh
RoundRect
StretchDraw
TextOut
TextRect
TextRect
Unlock

//函数:
HandleAllocated
TextExtent
TextHeight
TextWidth
TryLock

//属性:
ClipRect
Handle
LockCount
CanvasOrientation
PenPos
Pixels
TextFlags
Brush
CopyMode
Font
Pen