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/*
==============================================================================
This file is part of the IEM plug-in suite.
Author: Daniel Rudrich
Copyright (c) 2017 - Institute of Electronic Music and Acoustics (IEM)
https://iem.at
The IEM plug-in suite is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
The IEM plug-in suite 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.
You should have received a copy of the GNU General Public License
along with this software. If not, see <https://www.gnu.org/licenses/>.
==============================================================================
*/
#pragma once
#include "../JuceLibraryCode/JuceHeader.h"
//==============================================================================
/*
*/
class LevelMeter : public juce::Component
{
class Overlay : public juce::Component
{
public:
Overlay() { setBufferedToImage (true); }
~Overlay() override = default;
const float decibelsToY (const float dB)
{
return offset - scale * std::tanh (dB / minLevel * -2.0f);
}
void setMinLevel (float newMinLevel)
{
minLevel = newMinLevel;
repaint();
}
const float getOffset() { return offset; }
const float getMeterHeight() { return getHeight() - 2; }
const juce::Rectangle<int> getMeterArea() { return meterArea; }
private:
void paint (juce::Graphics& g) override
{
juce::Path bg;
juce::Rectangle<int> meterArea (0, 0, getWidth(), getHeight());
meterArea.reduce (2, 2);
int width = meterArea.getWidth();
int xPos = meterArea.getX();
bg.addRoundedRectangle (meterArea, 2);
g.setColour (juce::Colour (0xFF212121));
g.strokePath (bg, juce::PathStrokeType (2.f));
g.setColour (juce::Colours::white);
auto currentFont = juce::FontOptions (getLookAndFeel().getTypefaceForFont (
juce::FontOptions (9.0f, 0)))
.withHeight (9.0f);
g.setFont (currentFont);
int lastTextDrawPos = -1;
drawLevelMark (g, xPos, width, 0, "0");
drawLevelMark (g, xPos, width, -3, "3");
drawLevelMark (g, xPos, width, -6, "6");
for (float dB = -10.0f; dB >= minLevel; dB -= 5.0f)
lastTextDrawPos = drawLevelMark (g,
xPos,
width,
dB,
juce::String (juce::roundToInt (-dB)),
lastTextDrawPos);
}
void resized() override
{
offset = 0.1 * getHeight();
scale = getHeight() - offset;
meterArea = juce::Rectangle<int> (0, 0, getWidth(), getHeight()).reduced (2, 2);
}
const int inline drawLevelMark (juce::Graphics& g,
int x,
int width,
const int level,
const juce::String& label,
int lastTextDrawPos = -1)
{
float yPos = decibelsToY (level);
x = x + 1.0f;
width = width - 2.0f;
g.drawLine (x, yPos, x + 2, yPos);
g.drawLine (x + width - 2, yPos, x + width, yPos);
if (yPos - 4 > lastTextDrawPos)
{
g.drawText (label,
x + 2,
yPos - 4,
width - 4,
9,
juce::Justification::centred,
false);
return yPos + 5;
}
return lastTextDrawPos;
}
juce::Rectangle<int> meterArea;
float minLevel = -60.0f;
float scale = 0.0f;
float offset = 0.0f;
};
public:
LevelMeter() { addAndMakeVisible (overlay); }
~LevelMeter() {}
void setGainReductionMeter (bool isGainReductionMeter)
{
isGRmeter = isGainReductionMeter;
repaint();
}
void paint (juce::Graphics& g) override
{
const int height = overlay.getMeterHeight();
auto meterArea = overlay.getMeterArea();
g.setColour (juce::Colours::black);
g.fillRect (meterArea);
juce::Rectangle<int> lvlRect;
if (isGRmeter)
lvlRect = juce::Rectangle<int> (
juce::Point<int> (meterArea.getX(), overlay.getOffset()),
juce::Point<int> (meterArea.getRight(), overlay.decibelsToY (level)));
else
lvlRect = juce::Rectangle<int> (
juce::Point<int> (meterArea.getX(), height),
juce::Point<int> (meterArea.getRight(), overlay.decibelsToY (level)));
g.setColour (levelColour);
g.fillRect (lvlRect);
}
void setColour (juce::Colour newColour)
{
levelColour = newColour;
repaint();
}
void setLevel (const float newLevel)
{
if (level != newLevel)
{
level = newLevel;
repaint();
}
}
void setMinLevel (float newMinLevel)
{
overlay.setMinLevel (newMinLevel);
repaint();
}
void resized() override { overlay.setBounds (getLocalBounds()); }
private:
Overlay overlay;
juce::Colour levelColour = juce::Colour (juce::Colours::green);
bool isGRmeter = false;
float level = 0.0f;
JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LevelMeter)
};
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