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{
Ported to FPC by Nikolay Nikolov (nickysn@users.sourceforge.net)
}
{
Clip example for OpenPTC 1.0 C++ Implementation
Copyright (c) Glenn Fiedler (ptc@gaffer.org)
This source code is in the public domain
}
Program ClipExample;
{$MODE objfpc}
Uses
ptc;
Var
console : TPTCConsole;
surface : TPTCSurface;
format : TPTCFormat;
area : TPTCArea;
x1, y1, x2, y2 : Integer;
pixels : Pint32;
width, height : Integer;
i : Integer;
x, y, r, g, b : Integer;
Begin
format := Nil;
surface := Nil;
console := Nil;
Try
Try
{ create console }
console := TPTCConsole.Create;
{ create format }
format := TPTCFormat.Create(32, $00FF0000, $0000FF00, $000000FF);
{ open the console }
console.open('Clip example', format);
{ create surface matching console dimensions }
surface := TPTCSurface.Create(console.width, console.height, format);
{ calculate clip coordinates }
x1 := console.width Div 4;
y1 := console.height Div 4;
x2 := console.width - x1;
y2 := console.height - y1;
{ setup clip area }
area := TPTCArea.Create(x1, y1, x2, y2);
Try
{ set clip area }
console.clip(area);
Finally
area.Free;
End;
{ loop until a key is pressed }
While Not console.KeyPressed Do
Begin
{ lock surface }
pixels := surface.lock;
Try
{ get surface dimensions }
width := surface.width;
height := surface.height;
{ draw random pixels }
For i := 1 To 100 Do
Begin
{ get random position }
x := Random(width);
y := Random(height);
{ get random color }
r := Random(256);
g := Random(256);
b := Random(256);
{ draw color [r,g,b] at position [x,y] }
pixels[x + y * width] := (r Shl 16) + (g Shl 8) + b;
End;
Finally
{ unlock surface }
surface.unlock;
End;
{ copy to console }
surface.copy(console);
{ update console }
console.update;
End;
Finally
console.close;
console.Free;
surface.Free;
format.Free;
End;
Except
On error : TPTCError Do
{ report error }
error.report;
End;
End.
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