-
Notifications
You must be signed in to change notification settings - Fork 0
/
commonnumeralutils.pas
124 lines (106 loc) · 3.75 KB
/
commonnumeralutils.pas
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
unit CommonNumeralUtils;
{ Common routines to work with numbers.
Copyright (C) 2018 Mohammadreza Bahrami m.audio91@gmail.com
This library is free software; you can redistribute it and/or modify it
under the terms of the GNU Library General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at your
option) any later version with the following modification:
As a special exception, the copyright holders of this library give you
permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent modules,and
to copy and distribute the resulting executable under terms of your choice,
provided that you also meet, for each linked independent module, the terms
and conditions of the license of that module. An independent module is a
module which is not derived from or based on this library. If you modify
this library, you may extend this exception to your version of the library,
but you are not obligated to do so. If you do not wish to do so, delete this
exception statement from your version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
for more details.
You should have received a copy of the GNU Library General Public License
along with this library; if not, write to the Free Software Foundation,
Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1335, USA.
}
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils;
function ForceInRange(var AValue: Longint; AMin, AMax: Longint): Boolean; overload;
function ForceInRange(var Value: Double; Min, Max: Double): Boolean; overload;
function ConvertInRange(AValue, AOldRangeMin, AOldRangeMax, ANewRangeMin,
ANewRangeMax: Integer): Integer;
function FloatRound(AValue: Double; ADecimalPrecision: Integer): Double;
function NMultiplier(AValue: Integer): Integer;
implementation
function ForceInRangeBase(const AValue, AMin, AMax: Double): Double; overload;
begin
Result := AValue;
if AValue > AMax then
Result := AMax
else if AValue < AMin then
Result := AMin
end;
function ForceInRange(var AValue: Longint; AMin, AMax: Longint): Boolean; overload;
var
d: Double;
begin
Result := False;
d := ForceInRangeBase(AValue, AMin, AMax);
if d <> AValue then
begin
AValue := Trunc(d);
Result := True;
end;
end;
function ForceInRange(var Value: Double; Min, Max: Double): Boolean; overload;
var
d: Double;
begin
Result := False;
d := ForceInRangeBase(Value, Min, Max);
if d <> Value then
begin
Value := d;
Result := True;
end;
end;
function ConvertInRange(AValue, AOldRangeMin, AOldRangeMax, ANewRangeMin,
ANewRangeMax: Integer): Integer;
var
OldRange, NewRange: Integer;
begin
Result := ANewRangeMin;
if AOldRangeMin >= AOldRangeMax then Exit;
if ANewRangeMin >= ANewRangeMax then Exit;
if AValue <= AOldRangeMin then Exit(ANewRangeMin);
if AValue >= AOldRangeMax then Exit(ANewRangeMax);
OldRange := AOldRangeMax-AOldRangeMin;
NewRange := ANewRangeMax-ANewRangeMin;
Result := Round((((AValue-AOldRangeMin)*NewRange)/OldRange)+ANewRangeMin);
ForceInRange(Result, ANewRangeMin, ANewRangeMax);
end;
function FloatRound(AValue: Double; ADecimalPrecision: Integer): Double;
var
m: Integer;
begin
Result := AValue;
if ADecimalPrecision < 1 then
Result := Round(AValue)
else
begin
m := NMultiplier(ADecimalPrecision);
Result := Round(AValue*m)/m;
end;
end;
function NMultiplier(AValue: Integer): Integer;
var
i: Integer;
begin
Result := 1;
if AValue < 1 then Exit;
for i := 1 to AValue do
Result := Result * 10;
end;
end.