text: /*
  -----------------------------------------------------------------------------
  This source file is part of OGRE-Next
      (Object-oriented Graphics Rendering Engine)
  For the latest info, see http://www.ogre3d.org/
  
  Copyright (c) 2000-2014 Torus Knot Software Ltd
  
  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 __AreaEmitter_H__
  #define __AreaEmitter_H__
  
  #include "OgreParticleFXPrerequisites.h"
  
  #include "OgreParticleEmitter.h"
  
  namespace Ogre
  {
      /** Particle emitter which emits particles randomly from points inside
          an area (box, sphere, ellipsoid whatever subclasses choose to be).
      @remarks
          This is an empty superclass and needs to be subclassed. Basic particle
          emitter emits particles from/in an (unspecified) area. The
          initial direction of these particles can either be a single direction
          (i.e. a line), a random scattering inside a cone, or a random
          scattering in all directions, depending the 'angle' parameter, which
          is the angle across which to scatter the particles either side of the
          base direction of the emitter.
      */
      class _OgreParticleFXExport AreaEmitter : public ParticleEmitter
      {
      public:
          /** Command object for area emitter size (see ParamCommand).*/
          class CmdWidth final : public ParamCommand
          {
          public:
              String doGet( const void *target ) const override;
              void   doSet( void *target, const String &val ) override;
          };
          /** Command object for area emitter size (see ParamCommand).*/
          class CmdHeight final : public ParamCommand
          {
          public:
              String doGet( const void *target ) const override;
              void   doSet( void *target, const String &val ) override;
          };
          /** Command object for area emitter size (see ParamCommand).*/
          class CmdDepth final : public ParamCommand
          {
          public:
              String doGet( const void *target ) const override;
              void   doSet( void *target, const String &val ) override;
          };
  
          AreaEmitter( ParticleSystem *psys ) : ParticleEmitter( psys ) {}
  
          /** See ParticleEmitter. */
          unsigned short _getEmissionCount( Real timeElapsed ) override;
  
          /** Overloaded to update the trans. matrix */
          void setDirection( const Vector3 &direction ) override;
  
          /** Sets the size of the area from which particles are emitted.
          @param
              size Vector describing the size of the area. The area extends
              around the center point by half the x, y and z components of
              this vector. The box is aligned such that it's local Z axis points
              along it's direction (see setDirection)
          */
          void setSize( const Vector3 &size );
  
          /** Sets the size of the area from which particles are emitted.
          @param x,y,z
              Individual axis lengths describing the size of the area. The area
              extends around the center point by half the x, y and z components
              of this vector. The box is aligned such that it's local Z axis
              points along it's direction (see setDirection)
          */
          void setSize( Real x, Real y, Real z );
  
          /** Sets the width (local x size) of the emitter. */
          void setWidth( Real width );
          /** Gets the width (local x size) of the emitter. */
          Real getWidth() const;
          /** Sets the height (local y size) of the emitter. */
          void setHeight( Real Height );
          /** Gets the height (local y size) of the emitter. */
          Real getHeight() const;
          /** Sets the depth (local y size) of the emitter. */
          void setDepth( Real Depth );
          /** Gets the depth (local y size) of the emitter. */
          Real getDepth() const;
  
      protected:
          /// Size of the area
          Vector3 mSize;
  
          /// Local axes, not normalised, their magnitude reflects area size
          Vector3 mXRange, mYRange, mZRange;
  
          /// Internal method for generating the area axes
          void genAreaAxes();
          /** Internal for initializing some defaults and parameters
          @return True if custom parameters need initialising
          */
          bool initDefaults( const String &mType );
  
          /// Command objects
          static CmdWidth  msWidthCmd;
          static CmdHeight msHeightCmd;
          static CmdDepth  msDepthCmd;
      };
  
  }  // namespace Ogre
  
  #endif
  