本文整理自网络，侵删。
一个典型的例子，ZT的
应该可以看明白了
Delphi(Pascal) code program MASK;
uses
windows,
Graphics;
{$R *.res}
var
DC:TCanvas;
i,j:integer;
begin
DC:=tcanvas.create;
DC.handle:=getdc(0);
for i:= 1 to 400 do begin
DC.MoveTo(400,300);
DC.LineTo(2*i,1);
DC.MoveTo(400,300);
DC.LineTo(2*i,600);
DC.MoveTo(400,300);
DC.LineTo(1,round(i*1.5));
DC.MoveTo(400,300);
DC.LineTo(800,round(i*1.5));
end;
DC.Pen.Color:=clred;
For j:= 1 to 120 do begin
DC.moveTo(600,1);
for i:= 1 to 800 do
DC.LineTo(i,600-round(i*i/(Sqr(j)/2)));
DC.moveTo(1,1);
for i:= 1 to 800 do
DC.LineTo(i,round(i*i/(Sqr(j)/2)));
end;
DC.Font.Size:=72 ;
DC.Font.Color:=clblue;
DC.Brush.Color:=clbackground;
DC.textout(10,100,'看不到了吧！');
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