1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
{
Ported to FPC by Nikolay Nikolov (nickysn@users.sourceforge.net)
}
{
Area example for OpenPTC 1.0 C++ implementation
Copyright (c) Glenn Fiedler (ptc@gaffer.org)
This source code is in the public domain
}
program AreaExample;
{$MODE objfpc}
uses
ptc;
var
console: IPTCConsole;
format: IPTCFormat;
surface: IPTCSurface;
pixels: PDWord;
width, height: Integer;
i: Integer;
x, y, r, g, b: Integer;
area: IPTCArea;
begin
try
try
{ create console }
console := TPTCConsoleFactory.CreateNew;
{ create format }
format := TPTCFormatFactory.CreateNew(32, $00FF0000, $0000FF00, $000000FF);
{ create console }
console.open('Area example', format);
{ create surface half the size of the console }
surface := TPTCSurfaceFactory.CreateNew(console.width div 2, console.height div 2, format);
{ setup destination area }
x := console.width div 4;
y := console.height div 4;
area := TPTCAreaFactory.CreateNew(x, y, x + surface.width, y + surface.height);
{ 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 surface to console destination area }
surface.copy(console, surface.area, area);
{ update console area }
console.update;
end;
finally
if Assigned(console) then
console.close;
end;
except
on error: TPTCError do
{ report error }
error.report;
end;
end.
|
