JUCE/examples/Demo/Source/DemoUtilities.h

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

   This file is part of the JUCE library.
   Copyright (c) 2017 - ROLI Ltd.

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 5 End-User License
   Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
   27th April 2017).

   End User License Agreement: www.juce.com/juce-5-licence
   Privacy Policy: www.juce.com/juce-5-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

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

#pragma once

//==============================================================================
/*
    This file contains a bunch of miscellaneous utilities that are
    used by the various demos.
*/

//==============================================================================
inline Colour getRandomColour (float brightness)
{
    return Colour::fromHSV (Random::getSystemRandom().nextFloat(), 0.5f, brightness, 1.0f);
}

inline Colour getRandomBrightColour()   { return getRandomColour (0.8f); }
inline Colour getRandomDarkColour()     { return getRandomColour (0.3f); }

inline Colour getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour uiColour, Colour fallback = Colour (0xff4d4d4d))
{
    if (auto* v4 = dynamic_cast<LookAndFeel_V4*> (&LookAndFeel::getDefaultLookAndFeel()))
        return v4->getCurrentColourScheme().getUIColour (uiColour);

    return fallback;
}

//==============================================================================
// This is basically a sawtooth wave generator - maps a value that bounces between
// 0.0 and 1.0 at a random speed
struct BouncingNumber
{
    BouncingNumber()
        : speed (0.0004 + 0.0007 * Random::getSystemRandom().nextDouble()),
          phase (Random::getSystemRandom().nextDouble())
    {
    }

    float getValue() const
    {
        double v = fmod (phase + speed * Time::getMillisecondCounterHiRes(), 2.0);
        return (float) (v >= 1.0 ? (2.0 - v) : v);
    }

protected:
    double speed, phase;
};

struct SlowerBouncingNumber  : public BouncingNumber
{
    SlowerBouncingNumber()
    {
        speed *= 0.3;
    }
};