circlemodifier.cpp

// © Copyright 2010 - 2016 BlackTopp Studios Inc.
/* This file is part of The Mezzanine Engine.

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    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
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*/
/* The original authors have included a copy of the license specified above in the
   'Docs' folder. See 'gpl.txt'
*/
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/*
 -----------------------------------------------------------------------------
 This source file is part of ogre-procedural

 For the latest info, see http://code.google.com/p/ogre-procedural/

 Copyright (c) 2010-2013 Michael Broutin

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
 in the Software without restriction, including without limitation the rights
 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 copies of the Software, and to permit persons to whom the Software is
 furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in
 all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 -----------------------------------------------------------------------------
 */
#ifndef _graphicsproceduralcirclemodifier_cpp
#define _graphicsproceduralcirclemodifier_cpp

#include "Graphics/Procedural/Texture/circlemodifier.h"

namespace Mezzanine
{
    namespace Graphics
    {
        namespace Procedural
        {
            CircleModifier::CircleModifier() :
                CircleColour(ColourValue::White()),
                CircleRadius(0),
                CircleXRel(0.5),
                CircleYRel(0.5),
                CircleXAdj(0),
                CircleYAdj(0)
                {  }

            CircleModifier::~CircleModifier()
                {  }

            void CircleModifier::PutPixel(const Integer XPos, const Integer YPos, TextureBuffer& Buffer)
            {
                if( XPos < 0 || XPos >= static_cast<Integer>( Buffer.GetWidth() ) ) {
                    return;
                }
                if( YPos < 0 || YPos >= static_cast<Integer>( Buffer.GetHeight() ) ) {
                    return;
                }
                Buffer.SetPixel(XPos,YPos,this->CircleColour);
            }

            ///////////////////////////////////////////////////////////////////////////////
            // Utility

            void CircleModifier::Modify(TextureBuffer& Buffer)
            {
                const Integer TargetWidth = static_cast<Integer>( Buffer.GetWidth() );
                const Integer TargetHeight = static_cast<Integer>( Buffer.GetHeight() );
                const Integer XPos = ( ( this->CircleXRel * TargetWidth ) + this->CircleXAdj );
                const Integer YPos = ( ( this->CircleYRel * TargetHeight ) + this->CircleYAdj );

                Integer IntRadius = static_cast<Integer>( this->CircleRadius );
                Integer SquareRadius = IntRadius * IntRadius;
                for( Integer Y = -IntRadius ; Y < IntRadius ; ++Y )
                {
                    for( Integer X = -IntRadius ; X < IntRadius ; ++X )
                    {
                        if( X * X + Y * Y < SquareRadius ) {
                            this->PutPixel( XPos + X, YPos + Y, Buffer );
                        }
                    }
                }
                /// @todo Investigate the proper implementation of this algorithm.
                /// This appears to be the Midpoint Circle Algorithm, but also can't handle the left and right edges after the angle becomes perfectly diagonal.
                /// This should be able to produce superior results, faster, compared to the brute force algorithm above.
                /*Integer X = 0;
                Integer Y = this->CircleRadius;
                //Integer P = 3 - ( 2 * this->CircleRadius );
                Integer P = 1 - this->CircleRadius;

                while( X <= Y )
                {
                    for( Integer DeltaY = -Y ; DeltaY <= Y ; DeltaY++ )
                    {
                        this->PutPixel( XPos + X, YPos + DeltaY, Buffer );
                        this->PutPixel( XPos - X, YPos + DeltaY, Buffer );
                    }
                    for( Integer DeltaX = -X ; DeltaX <= X ; DeltaX++ )
                    {
                        this->PutPixel( XPos + DeltaX, YPos + Y, Buffer );
                        this->PutPixel( XPos + DeltaX, YPos - Y, Buffer );
                    }
                    if( P < 0 ) {
                        //P += 4 * X++ + 6;
                        P += 2 * X++ + 1;
                    }else{
                        //P += 4 * ( X++ - Y-- ) + 10;
                        P += 2 * ( X++ - Y-- ) + 1;
                    }
                }// */
            }

            String CircleModifier::GetName() const
                { return "CircleModifier"; }

            ///////////////////////////////////////////////////////////////////////////////
            // Configuration

            CircleModifier& CircleModifier::SetColour(const ColourValue& Colour)
            {
                this->CircleColour = Colour;
                return *this;
            }

            CircleModifier& CircleModifier::SetColour(const Real Red, const Real Green, const Real Blue, const Real Alpha)
            {
                this->CircleColour.SetValues(Red,Green,Blue,Alpha);
                return *this;
            }

            CircleModifier& CircleModifier::SetRadius(const Whole Radius)
            {
                this->CircleRadius = Radius;
                return *this;
            }

            CircleModifier& CircleModifier::SetPosition(const Real XRel, const Real YRel, const Integer XAdj, const Integer YAdj)
            {
                this->CircleXRel = XRel;
                this->CircleYRel = YRel;
                this->CircleXAdj = XAdj;
                this->CircleYAdj = YAdj;
                return *this;
            }

            CircleModifier& CircleModifier::SetXPositionRel(const Real X)
            {
                this->CircleXRel = X;
                return *this;
            }

            CircleModifier& CircleModifier::SetYPositionRel(const Real Y)
            {
                this->CircleYRel = Y;
                return *this;
            }

            CircleModifier& CircleModifier::SetXPositionAdj(const Integer X)
            {
                this->CircleXAdj = X;
                return *this;
            }

            CircleModifier& CircleModifier::SetYPositionAdj(const Integer Y)
            {
                this->CircleYAdj = Y;
                return *this;
            }
        }//Procedural
    }//Graphics
}//Mezzanine

#endif