summaryrefslogtreecommitdiff
path: root/src/corelib/render/software/agg_trans_warp_magnifier.pas
blob: fe8df736eb587afc3259a2169894a3c6137b85ed (plain)
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
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4 (Public License)
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Anti-Grain Geometry - Version 2.4 Release Milano 3 (AggPas 2.4 RM3)
// Pascal Port By: Milan Marusinec alias Milano
//                 milan@marusinec.sk
//                 http://www.aggpas.org
// Copyright (c) 2005-2006
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
//          mcseemagg@yahoo.com
//          http://www.antigrain.com
//
// [Pascal Port History] -----------------------------------------------------
//
// 06.20.2006-Milano: Unit port establishment
//
{ agg_trans_warp_magnifier.pas }
unit
 agg_trans_warp_magnifier ;

INTERFACE

{$I agg_mode.inc }

uses
 agg_basics ,
 agg_trans_affine ;

{ TYPES DEFINITION }
type
 trans_warp_magnifier_ptr = ^trans_warp_magnifier;
 trans_warp_magnifier = object(trans_affine )
   m_xc ,
   m_yc ,

   m_magn   ,
   m_radius : double;

   constructor Construct;

   procedure center       (x ,y : double );
   procedure magnification(m : double );
   procedure radius       (r : double );

  end;

{ GLOBAL PROCEDURES }


IMPLEMENTATION
{ LOCAL VARIABLES & CONSTANTS }
{ UNIT IMPLEMENTATION }
{ _transform }
procedure _transform(this : trans_warp_magnifier_ptr; x ,y : double_ptr );
var
 dx ,dy ,r ,m : double;

begin
 dx:=x^ - this.m_xc;
 dy:=y^ - this.m_yc;
 r :=Sqrt(dx * dx + dy * dy );

 if r < this.m_radius then
  begin
   x^:=this.m_xc + dx * this.m_magn;
   y^:=this.m_yc + dy * this.m_magn;

   exit;

  end;

 m:=(r + this.m_radius * (this.m_magn - 1.0 ) ) / r;

 x^:=this.m_xc + dx * m;
 y^:=this.m_yc + dy * m;

end;

{ _inverse_transform }
procedure _inverse_transform(this : trans_warp_magnifier_ptr; x ,y : double_ptr );
var
 t : trans_warp_magnifier;

begin
 t.Construct;

 t:=this^;

 t.magnification(1.0 / this.m_magn );
 t.radius       (this.m_radius * this.m_magn );
 t.transform    (@t ,x ,y );

end;

{ CONSTRUCT }
constructor trans_warp_magnifier.Construct;
begin
 inherited Construct;

 m_xc:=0.0;
 m_yc:=0.0;

 m_magn  :=1.0;
 m_radius:=1.0;

 transform        :=@_transform;
 inverse_transform:=@_inverse_transform;

end;

{ CENTER }
procedure trans_warp_magnifier.center;
begin
 m_xc:=x;
 m_yc:=y;

end;

{ MAGNIFICATION }
procedure trans_warp_magnifier.magnification;
begin
 m_magn:=m;

end;

{ RADIUS }
procedure trans_warp_magnifier.radius;
begin
 m_radius:=r;

end;

END.