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{
Ported to FPC by Nikolay Nikolov (nickysn@users.sourceforge.net)
}
{
Stretch example for OpenPTC 1.0 C++ Implementation
Copyright (c) Glenn Fiedler (ptc@gaffer.org)
This source code is in the public domain
}
Program StretchExample;
{$MODE objfpc}
Uses
ptc;
Procedure load(surface : TPTCSurface; filename : String);
Var
F : File;
width, height : Integer;
pixels : PByte;
y : Integer;
tmp : TPTCFormat;
tmp2 : TPTCPalette;
Begin
{ open image file }
ASSign(F, filename);
Reset(F, 1);
{ skip header }
Seek(F, 18);
{ get surface dimensions }
width := surface.width;
height := surface.height;
{ allocate image pixels }
pixels := GetMem(width * height * 3);
Try
{ read image pixels one line at a time }
For y := height - 1 DownTo 0 Do
BlockRead(F, pixels[width * y * 3], width * 3);
{ load pixels to surface }
tmp := TPTCFormat.Create(24, $00FF0000, $0000FF00, $000000FF);
Try
tmp2 := TPTCPalette.Create;
Try
surface.load(pixels, width, height, width * 3, tmp, tmp2);
Finally
tmp2.Free;
End;
Finally
tmp.Free;
End;
Finally
{ free image pixels }
FreeMem(pixels);
End;
End;
Var
console : TPTCConsole;
surface : TPTCSurface;
image : TPTCSurface;
format : TPTCFormat;
timer : TPTCTimer;
area : TPTCArea;
color : TPTCColor;
time : Double;
zoom : Single;
x, y, x1, y1, x2, y2, dx, dy : Integer;
Begin
format := Nil;
color := Nil;
timer := Nil;
image := 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('Stretch example', format);
{ create surface matching console dimensions }
surface := TPTCSurface.Create(console.width, console.height, format);
{ create image surface }
image := TPTCSurface.Create(320, 140, format);
{ load image to surface }
load(image, 'stretch.tga');
{ setup stretching parameters }
x := surface.width Div 2;
y := surface.height Div 2;
dx := surface.width Div 2;
dy := surface.height Div 3;
{ create timer }
timer := TPTCTimer.Create;
{ start timer }
timer.start;
color := TPTCColor.Create(1, 1, 1);
{ loop until a key is pressed }
While Not console.KeyPressed Do
Begin
{ get current time from timer }
time := timer.time;
{ clear surface to white background }
surface.clear(color);
{ calculate zoom factor at current time }
zoom := 2.5 * (1 - cos(time));
{ calculate zoomed image coordinates }
x1 := Trunc(x - zoom * dx);
y1 := Trunc(y - zoom * dy);
x2 := Trunc(x + zoom * dx);
y2 := Trunc(y + zoom * dy);
{ setup image copy area }
area := TPTCArea.Create(x1, y1, x2, y2);
Try
{ copy and stretch image to surface }
image.copy(surface, image.area, area);
{ copy surface to console }
surface.copy(console);
{ update console }
console.update;
Finally
area.Free;
End;
End;
Finally
console.close;
console.Free;
surface.Free;
format.Free;
image.Free;
color.Free;
timer.Free;
End;
Except
On error : TPTCError Do
{ report error }
error.report;
End;
End.
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