JUCE/modules/juce_graphics/effects/juce_GlowEffect.h

/*
  ==============================================================================

   This file is part of the JUCE library - "Jules' Utility Class Extensions"
   Copyright 2004-11 by Raw Material Software Ltd.

  ------------------------------------------------------------------------------

   JUCE can be redistributed and/or modified under the terms of the GNU General
   Public License (Version 2), as published by the Free Software Foundation.
   A copy of the license is included in the JUCE distribution, or can be found
   online at www.gnu.org/licenses.

   JUCE 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 General Public License for more details.

  ------------------------------------------------------------------------------

   To release a closed-source product which uses JUCE, commercial licenses are
   available: visit www.rawmaterialsoftware.com/juce for more information.

  ==============================================================================
*/

#ifndef __JUCE_GLOWEFFECT_JUCEHEADER__
#define __JUCE_GLOWEFFECT_JUCEHEADER__

#include "juce_ImageEffectFilter.h"


//==============================================================================
/**
    A component effect that adds a coloured blur around the component's contents.

    (This will only work on non-opaque components).

    @see Component::setComponentEffect, DropShadowEffect
*/
class JUCE_API  GlowEffect  : public ImageEffectFilter
{
public:
    //==============================================================================
    /** Creates a default 'glow' effect.

        To customise its appearance, use the setGlowProperties() method.
    */
    GlowEffect();

    /** Destructor. */
    ~GlowEffect();

    //==============================================================================
    /** Sets the glow's radius and colour.

        The radius is how large the blur should be, and the colour is
        used to render it (for a less intense glow, lower the colour's
        opacity).
    */
    void setGlowProperties (float newRadius,
                            const Colour& newColour);


    //==============================================================================
    /** @internal */
    void applyEffect (Image& sourceImage, Graphics& destContext, float scaleFactor, float alpha);

private:
    //==============================================================================
    float radius;
    Colour colour;

    JUCE_LEAK_DETECTOR (GlowEffect)
};


#endif   // __JUCE_GLOWEFFECT_JUCEHEADER__