98 lines
2.4 KiB
C++
98 lines
2.4 KiB
C++
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#include "qmidipianoroll.h"
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#include <QPainter>
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#include <QGraphicsRectItem>
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QMidiPianoRoll::QMidiPianoRoll(QWidget *parent) :
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QGraphicsView(parent),
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_scene(new QGraphicsScene()),
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_keyWidth(10),
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_keyHeight(60)
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{
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float x = 0;
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for(int i = 0; i < 128; i++)
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{
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int position = i % 12;
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QGraphicsRectItem *rect;
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if(position == 0 || position == 2 || position == 4 || position == 5 || position == 7 || position == 9 || position == 11)
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{
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rect = new QGraphicsRectItem(x,0,_keyWidth,_keyHeight);
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_scene->addItem(rect);
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if(position != 4 && position != 11 )
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{
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x += _keyWidth/2+1;
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}
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else
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{
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x += _keyWidth+1;
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}
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}
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else
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{
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rect = new QGraphicsRectItem(x,0,_keyWidth,_keyHeight/2);
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rect->setZValue(2);
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QBrush brush;
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QPen pen;
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brush.setStyle(Qt::SolidPattern);
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pen.setColor(Qt::black);
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brush.setColor(Qt::black);
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rect->setBrush(brush);
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rect->setPen(pen);
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_scene->addItem(rect);
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x += _keyWidth/2+1;
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}
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_keys.push_back(rect);
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}
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setScene(_scene);
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}
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bool QMidiPianoRoll::isSemiTone(int pitch)
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{
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int position = pitch %12;
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if(position == 0 || position == 2 || position == 4 || position == 5 || position == 7 || position == 9 || position == 11)
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{
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return false;
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}
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else
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{
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return true;
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}
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}
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//void QMidiPianoRoll::paintEvent(QPaintEvent *event)
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//{
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//// QPainter painter(this);
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//}
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void QMidiPianoRoll::onMidiReceive(QMidiMessage *message)
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{
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switch(message->getStatus())
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{
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case MIDI_NOTE_ON: {
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QBrush brush;
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brush.setStyle(Qt::SolidPattern);
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brush.setColor(QColor(0,0,200, message->getVelocity()*2));
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_keys[message->getPitch()]->setBrush(brush);
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break;
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}
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case MIDI_NOTE_OFF: {
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QBrush brush;
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brush.setStyle(Qt::SolidPattern);
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QColor color;
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if(isSemiTone(message->getPitch()))
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{
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color = QColor(Qt::black);
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}
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else
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{
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color = QColor(Qt::white);
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}
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brush.setColor(color);
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_keys[message->getPitch()]->setBrush(brush);
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break;
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}
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default: break;
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}
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}
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