C++ 简单问题-如何从';类别';在一个单独的';结构';?
我是C++/JUCE新手。我一直在努力让一个基本的synth运行,只是测试一些东西来学习诀窍 它已经很好用了。但我仍在学习C++/JUCE,以及如何声明或访问类/对象/变量 我正试图对我一直坚持的东西进行修改 我有以下内容(只是摘录来演示) 这是设置合成器电平的地方:C++ 简单问题-如何从';类别';在一个单独的';结构';?,c++,class,variables,struct,juce,C++,Class,Variables,Struct,Juce,我是C++/JUCE新手。我一直在努力让一个基本的synth运行,只是测试一些东西来学习诀窍 它已经很好用了。但我仍在学习C++/JUCE,以及如何声明或访问类/对象/变量 我正试图对我一直坚持的东西进行修改 我有以下内容(只是摘录来演示) 这是设置合成器电平的地方: struct SineWaveVoice : public SynthesiserVoice { SineWaveVoice() {} bool canPlaySound (SynthesiserSound* sound)
struct SineWaveVoice : public SynthesiserVoice
{
SineWaveVoice() {}
bool canPlaySound (SynthesiserSound* sound) override
{
return dynamic_cast<SineWaveSound*> (sound) != nullptr;
}
void startNote (int midiNoteNumber, float velocity,
SynthesiserSound*, int /*currentPitchWheelPosition*/) override
{
currentAngle = 0.0;
level = velocity * 0.15;
tailOff = 0.0;
假设我想用这个水平滑块变量“targetLevel”乘以上面“struct”中的速度,而不是0.15
我需要在上面键入什么才能访问和使用“targetLevel”?我尝试了多种方法,但我还是不太明白
谢谢我假设您的正弦波语音位于SynthAudioSource类中,并且该语音是合成器对象的一部分。要从MainContentComponent访问SineWaveVoice结构中的任何内容,您需要通过SynthAudioSource以某种方式公开它。因此,我的建议是在SynthAudioSource中添加如下方法:
class MainContentComponent : public AudioAppComponent,
private Timer
{
public:
MainContentComponent()
: synthAudioSource(keyboardState),
keyboardComponent(keyboardState, MidiKeyboardComponent::horizontalKeyboard)
{
LabeledSlider* control = new LabeledSlider("Frequency");
control->slider.setRange(20.0, 20000.0);
control->slider.setSkewFactorFromMidPoint(500.0);
control->slider.setNumDecimalPlacesToDisplay(1);
control->slider.setValue(currentFrequency, dontSendNotification);
control->slider.onValueChange = [this] { targetFrequency = frequency.slider.getValue(); };
control->slider.setTextBoxStyle(Slider::TextBoxBelow, false, 100, 20);
control->slider.setRange(50.0, 5000.0);
control->slider.setSkewFactorFromMidPoint(500.0);
control->slider.setNumDecimalPlacesToDisplay(1);
addAndMakeVisible(knobs.add(control));
control = new LabeledSlider("Level");
control->slider.setRange(0.0, 1.0);
control->slider.onValueChange = [this] { targetLevel = (float)level.slider.getValue(); };
addAndMakeVisible(knobs.add(control));
....
private:
{
float currentLevel = 0.1f, targetLevel = 0.1f;
LabeledSlider level{ "Level" };
void setLevel(double lvl)
{
for (auto i=0; i<synth.getNumVoices(); i++)
{
SineWaveVoice *v = dynamic_cast<SineWaveVoice *>(synth.getVoice(i));
v->level = lvl * v->velocity;
}
}
但是,请注意,每次获得新的startNote事件时,该值都将被覆盖。因此,您可能应该在SineWaveVoice中存储一个目标级别的副本,并与之相乘,而不是0.15。每隔一分钟,删除currentLevel、targetLevel等周围的大括号。
control->slider.onValueChange = [this] {
targetLevel = (float)level.slider.getValue();
synthAudioSource.setLevel(targetLevel);
};