flickr.lib.math.pas

// Copyright (c) 2015, Jordi Corbilla
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// - Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// - Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// - Neither the name of this library nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.

unit flickr.lib.math;

interface

uses
    Math, Types;

type
    TMathHelper = class
      class function Compare(Value1, Value2: double; MethodComp: string): boolean;
    end;

const
    RealMargin = 0.000001;

implementation

uses
  SysUtils;

class function TMathHelper.Compare(Value1, Value2: double; MethodComp: string): boolean;
var
    bReturn: boolean;
begin
    bReturn := false;
    if MethodComp = '=' then
    begin
        case CompareValue(Value1, Value2, RealMargin) of
            EqualsValue: bReturn := true;
        end;
    end
    else if MethodComp = '<>' then
    begin
        bReturn := false;
        case CompareValue(Value1, Value2, RealMargin) of
            LessThanValue: bReturn := true;
            GreaterThanValue: bReturn := true
        end;
    end
    else if MethodComp = '>=' then
    begin
        case CompareValue(Value1, Value2, RealMargin) of
            EqualsValue: bReturn := true;
            GreaterThanValue: bReturn := true;
        end;
    end
    else if MethodComp = '>' then
    begin
        case CompareValue(Value1, Value2, RealMargin) of
            GreaterThanValue: bReturn := true;
        end;
    end
    else if MethodComp = '<=' then
    begin
        case CompareValue(Value1, Value2, RealMargin) of
            LessThanValue: bReturn := true;
            EqualsValue: bReturn := true;
        end;
    end
    else if MethodComp = '<' then
    begin
        case CompareValue(Value1, Value2, RealMargin) of
            LessThanValue: bReturn := true;
        end;
    end
    else
      raise Exception.Create('Not recognized operation!');
    result := bReturn;
end;

end.