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- nstrate the GetImage and PutImage commands }
-
- const
- r = 20;
- StartX = 100;
- StartY = 50;
-
- var
- CurPort : ViewPortType;
-
- procedure MoveSaucer(var X, Y : integer; Width, Height : integer);
- var
- Step : integer;
- begin
- Step := Random(2*r);
- if Odd(Step) then
- Step := -Step;
- X := X + Step;
- Step := Random(r);
- if Odd(Step) then
- Step := -Step;
- Y := Y + Step;
-
- { Make saucer bounce off viewport walls }
- with CurPort do
- begin
- if (x1 + X + Width - 1 > x2) then
- X := x2-x1 - Width + 1
- else
- if (X < 0) then
- X := 0;
- if (y1 + Y + Height - 1 > y2) then
- Y := y2-y1 - Height + 1
- else
- if (Y < 0) then
- Y := 0;
- end;
- end; { MoveSaucer }
-
- var
- Pausetime : word;
- Saucer : pointer;
- X, Y : integer;
- ulx, uly : word;
- lrx, lry : word;
- Size : word;
- I : word;
- begin
- ClearDevice;