答对给分！！！如何限定画图区域？

Question

设置该属性应该有用 ：
form1.Canvas.CanvasOrientation

Answer 1

可以通过控制鼠标来实现Form中放置二个 Button, 然後分别为这两个按钮定义OnClick响应事件如下:
// 限制
procedure TForm1.Button1Click(Sender: TObject);
var
rtButton2: TRect;
begin
rtButton2 := Button2.BoundsRect;
MapWindowPoints(handle, 0, rtButton2, 2); // 座标换算
ClipCursor(@rtButton2); // 限制鼠标移动区域
end;// 还原
procedure TForm1.Button2Click(Sender: TObject);
var
rtScreen: TRect;
begin
rtScreen := Rect(0, 0, Screen.Width, Screen.Height);
ClipCursor(@rtScreen);
end;

Answer 2

就是直接限制鼠标的活动范围！
方法前面都说的很详细了·999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
99999999999B@B@B@BBBMMMM999999999999999999999999999
999999999999M+:.:+9999M:999999999999999999999999999
9999999999999MM9+99MMM:9999999999999999999999999999
99999999999999M+.+99M:99999999999999999999999999999
99999999999999B:.++9M:99999999999999999999999999999
99999999999999B+.+99M:9999AAAAAA9999999999999999999
99999999999999B:.++9M:9AAA++++:+AAA9999999999999999
99999999999999B+.+99M:A+9+A:+++++9AA999999999999999
99999999999999B:.++9:A+@+A:,:++9+A9@M99999999999999
99999999999999B+.+9:A+A,,,,,,+A+A9@A@M9999999999999
99999999999999B:.++A+A+,,.,,+A9A9@A@M@M999999999999
99999999999999B+.+9AA+,,...,++A9@A@A@MM999999999999
99999999999999B:.+:A+++,,.,,++9@A@A@M@M999999999999
99999999999999B+.+A+@+,,,,,+9A@A+@@M@M@M99999999999
99999999999999B:.+A@+++,+,+9A9A++@M@M@MM99999999999
99999999999999B+.+A+@++++++A9A++9M@M@M@M99999999999
99999999999999B:.+A@+@+:+9A9A9A9M@M@M@9M99999999999
0A999999999999B+.+A+@+@+@+@+@A@A@9@9@9@M99999999999
99999999999999B:.+A@+@+@+@+@+@A@M@9@9@9M99999999999
99999999999999B+.+:A@+@+@+@+@A@M@9@9@9M999999999999
99999999999999B:.+:A9@+@+@+@9@A@M@9@9@M999999999999
99999999993333333333M9@9@9@9@9@M@9@9@9M999999999999
99999999993.........MAA99@9@9@M@9@9@9M9999999999999
99999999993...MMMM..MM@9@9@9@9@M@9@9M99999999999999
99999999993....MMM..M:M@9@9@9@9@9@9M999999999999999
99999999993...MMMM..M:9MMM@9@9@9MMM9999999999999999
99999999993..MMM.M..M:9999MMMMMM9999999999999999999
99999999993..MM.....M:99999999999999999999999999999
99999999993..M......M:99999999999999999999999999999
99999999993...M.....MM:9999999999999999999999999999
99999999993.........M9M:999999999999999999999999999
9999999999MMMMMMMMMMMMMM:99999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
99999999999999999999.9999999.9999999999999999999999
9999999....999999999.9999999.99999.999999..99999999
9999999.999.99999999.9999999.99999999999.9999999999
9999999.9999.99...99.9....99....99.9999.99999999999
9999999.9999.9.999.9.9.999.9.999.9.9999....99999999
9999999.9999.9.....9.9.999.9.999.9.9999.999.9999999
9999999.9999.9.99999.9.999.9.999.9.9999.999.9999999
9999999.999.99.999.9.9.999.9.999.9.9999.999.9999999
9999999....9999...99.9....99.999.9.99999...99999999
9999999999999999999999.9999999999999999999999999999
9999999999999999999999.9999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
999999999999999999999999999999999999999999999999999
9999999999999999999999999999999999999999999999999990

Answer 3

错了错了……可能是我没有说明白。
是这样的，我用form.canvas 作随机画布，因为很多时候他会超出边界（不是要他满form作图，还要留空间给别的控件），所以要限定范围。不是客户作图！！！