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https://github.com/juce-framework/JUCE.git
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120 lines
3.3 KiB
C++
120 lines
3.3 KiB
C++
/*
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==============================================================================
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This file is part of the JUCE library.
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Copyright (c) 2017 - ROLI Ltd.
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JUCE is an open source library subject to commercial or open-source
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licensing.
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By using JUCE, you agree to the terms of both the JUCE 5 End-User License
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Agreement and JUCE 5 Privacy Policy (both updated and effective as of the
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27th April 2017).
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End User License Agreement: www.juce.com/juce-5-licence
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Privacy Policy: www.juce.com/juce-5-privacy-policy
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Or: You may also use this code under the terms of the GPL v3 (see
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www.gnu.org/licenses).
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JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
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EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
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DISCLAIMED.
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==============================================================================
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*/
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#pragma once
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#include "../JuceLibraryCode/JuceHeader.h"
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// A very simple decaying meter.
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class SimpleMeter : public Component,
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private Timer
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{
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public:
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SimpleMeter()
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{
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startTimerHz (30);
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}
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//==============================================================================
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void paint (Graphics& g) override
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{
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g.fillAll (Colours::transparentBlack);
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auto area = g.getClipBounds();
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g.setColour (getLookAndFeel().findColour (Slider::thumbColourId));
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g.fillRoundedRectangle (area.toFloat(), 6.0);
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auto unfilledHeight = area.getHeight() * (1.0 - level);
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g.reduceClipRegion (area.getX(), area.getY(),
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area.getWidth(), (int) unfilledHeight);
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g.setColour (getLookAndFeel().findColour (Slider::trackColourId));
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g.fillRoundedRectangle (area.toFloat(), 6.0);
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}
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void resized() override {}
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//==============================================================================
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// Called from the audio thread.
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void update (float newLevel)
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{
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// We don't care if maxLevel gets set to zero (in timerCallback) between the
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// load and the assignment.
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maxLevel = jmax (maxLevel.load(), newLevel);
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}
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private:
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//==============================================================================
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void timerCallback() override
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{
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auto callbackLevel = maxLevel.exchange (0.0);
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auto decayFactor = 0.95;
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if (callbackLevel > level)
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level = callbackLevel;
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else if (level > 0.001)
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level *= decayFactor;
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else
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level = 0;
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repaint();
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}
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std::atomic<float> maxLevel {0.0};
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float level = 0;
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JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SimpleMeter)
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};
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#if JUCE_PROJUCER_LIVE_BUILD
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// Animate the meter in the Projucer live build.
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struct MockSimpleMeter : public Component,
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private Timer
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{
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MockSimpleMeter()
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{
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addAndMakeVisible (meter);
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resized();
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startTimerHz (100);
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}
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void paint (Graphics&) override {}
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void resized() override
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{
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meter.setBounds (getBounds());
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}
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void timerCallback() override
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{
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meter.update (std::pow (randomNumberGenerator.nextFloat(), 2));
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}
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SimpleMeter meter;
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Random randomNumberGenerator;
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};
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#endif
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