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Wrapper Library for Windows MIDI API

, 28 Jan 2008 MIT
A small library encapsulating the Windows MIDI API
mididevdemo.zip
MIDIDeviceDemo.exe
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MIDIDevDemo v2
MIDIDevDemo v2.clw
MIDIDevDemo v2.dsp
MIDIDevDemo v2.dsw
MIDIDevDemo v2.ncb
MIDIDevDemo v2.opt
MIDIDevDemo v2.plg
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MIDIDevDemo v2.ico
midiwrapper.zip
MIDIDeviceDemo.zip
MIDIWrapperSrc.zip
midiwrappersource.zip
MIDIWrapper Source
midiwrapper_demo.zip
MIDIDevDemo v2.clw
MIDIDevDemo v2.dsp
MIDIDevDemo v2.dsw
MIDIDevDemo v2.ico
midiwrapper_source.zip
MIDIWrapper_Source
MIDIWrapper Source
midiwrapper_src.zip
/*

  PianoKeys.cpp

  This class represents the implementation of the CPianoKey derived 
  classes.

  Copyright (C) 2002 Leslie Sanford

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.

  This library 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
  Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 
  USA

  Contact: Leslie Sanford (jabberdabber@hotmail.com)

  Last modified: 12/14/2002

*/


//---------------------------------------------------------------------
// Dependencies
//---------------------------------------------------------------------


#include <afxwin.h>
#include "PianoCtrl.h"


//---------------------------------------------------------------------
// Constants
//---------------------------------------------------------------------


// The width of the black keys as a percentage of the width of the 
// white keys
const double CPianoCtrl::CPianoKey::BLACK_KEY_OFFSET = 0.7;

// The number of units natural keys use in their widest part.
const int CPianoCtrl::CPianoKey::UNIT_PER_NAT_KEY = 3;


//---------------------------------------------------------------------
// CWhiteKeyLeft class implementation
//---------------------------------------------------------------------


// Constructor
CPianoCtrl::CWhiteKeyLeft::CWhiteKeyLeft(double UnitLength, int Width, 
                                         double Position)
{
    // Initialize upper portion of this key
    m_UpperRect.top    = 0;
    m_UpperRect.bottom = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_UpperRect.left   = static_cast<long>(Position);
    m_UpperRect.right  = static_cast<long>
        (Position + UnitLength * (UNIT_PER_NAT_KEY - 1));

    // Initialize lower portion of this key
    m_LowerRect.top    = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_LowerRect.bottom = Width - 1;
    m_LowerRect.left   = static_cast<long>(Position);
    m_LowerRect.right  = static_cast<long>
        (Position + UnitLength * UNIT_PER_NAT_KEY);
}


// Hit detection
bool CPianoCtrl::CWhiteKeyLeft::IsPointInKey(const CPoint &pt) const
{
    return (IsPointInRect(pt, m_UpperRect) || 
            IsPointInRect(pt, m_LowerRect));
}


// Turns note on
void CPianoCtrl::CWhiteKeyLeft::NoteOn(COLORREF NoteOnColor, 
                                       CRect &Rect)
{
    m_NoteOnFlag = true;
    m_NoteOnColor = NoteOnColor;

    CalcInvalidRect(Rect);
}


// Turns note off
void CPianoCtrl::CWhiteKeyLeft::NoteOff(CRect &Rect)
{
    m_NoteOnFlag = false;

    CalcInvalidRect(Rect);
}


// Paints the key
void CPianoCtrl::CWhiteKeyLeft::Paint(CDC *dc)
{
    //
    // Fill key
    //

    // Note is on
    if(m_NoteOnFlag)
    {
        dc->FillSolidRect(&m_UpperRect, m_NoteOnColor);
        dc->FillSolidRect(&m_LowerRect, m_NoteOnColor);
    }
    // Note is off
    else
    {
        dc->FillSolidRect(&m_UpperRect, RGB(250, 250, 250));
        dc->FillSolidRect(&m_LowerRect, RGB(250, 250, 250));
    }

    dc->SelectStockObject(BLACK_PEN);

    // 
    // Draw border
    //

    // Left side
    dc->MoveTo(m_UpperRect.left, m_UpperRect.top);
    dc->LineTo(m_UpperRect.left, m_LowerRect.bottom);

    // Bottom
    dc->LineTo(m_LowerRect.right, m_LowerRect.bottom);

    // Right side
    dc->LineTo(m_LowerRect.right, m_LowerRect.top);
    dc->LineTo(m_UpperRect.right, m_UpperRect.bottom);
    dc->LineTo(m_UpperRect.right, m_UpperRect.top);

    // Top
    dc->LineTo(m_UpperRect.left, m_UpperRect.top);
}


// Calculate the rectangular area to invalidate for this key
void CPianoCtrl::CWhiteKeyLeft::CalcInvalidRect(CRect &Rect)
{
    Rect.top    = m_UpperRect.top;
    Rect.bottom = m_LowerRect.bottom;
    Rect.left   = m_UpperRect.left;
    Rect.right  = m_LowerRect.right;
}


//---------------------------------------------------------------------
// CWhiteKeyMiddle class implementation
//---------------------------------------------------------------------


// Constructor
CPianoCtrl::CWhiteKeyMiddle::CWhiteKeyMiddle(double UnitLength, 
                                             int Width, double Position)
{
    // Initialize upper portion of this key
    m_UpperRect.top    = 0;
    m_UpperRect.bottom = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_UpperRect.left   = static_cast<long>(Position + UnitLength);
    m_UpperRect.right  = static_cast<long>
        (Position + UnitLength * (UNIT_PER_NAT_KEY - 1));

    // Initialize lower portion of this key
    m_LowerRect.top    = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_LowerRect.bottom = Width - 1;
    m_LowerRect.left   = static_cast<long>(Position);
    m_LowerRect.right  = static_cast<long>
        (Position + UnitLength * UNIT_PER_NAT_KEY);
}


// Hit detection
bool CPianoCtrl::CWhiteKeyMiddle::IsPointInKey(const CPoint &pt) const
{
    return (IsPointInRect(pt, m_UpperRect) || 
            IsPointInRect(pt, m_LowerRect));
}


// Turns note on
void CPianoCtrl::CWhiteKeyMiddle::NoteOn(COLORREF NoteOnColor, 
                                         CRect &Rect)
{
    m_NoteOnFlag = true;
    m_NoteOnColor = NoteOnColor;

    CalcInvalidRect(Rect);
}


// Turns note off
void CPianoCtrl::CWhiteKeyMiddle::NoteOff(CRect &Rect)
{
    m_NoteOnFlag = false;

    CalcInvalidRect(Rect);
}


// Paints key
void CPianoCtrl::CWhiteKeyMiddle::Paint(CDC *dc)
{
    //
    // Fill key
    //

    // Note is on
    if(m_NoteOnFlag)
    {
        dc->FillSolidRect(&m_UpperRect, m_NoteOnColor);
        dc->FillSolidRect(&m_LowerRect, m_NoteOnColor);
    }
    // Note is off
    else
    {
        dc->FillSolidRect(&m_UpperRect, RGB(250, 250, 250));
        dc->FillSolidRect(&m_LowerRect, RGB(250, 250, 250));
    }

    dc->SelectStockObject(BLACK_PEN);

    // 
    // Draw border
    //

    // Left side
    dc->MoveTo(m_UpperRect.left, m_UpperRect.top);
    dc->LineTo(m_UpperRect.left, m_UpperRect.bottom);
    dc->LineTo(m_LowerRect.left, m_LowerRect.top);
    dc->LineTo(m_LowerRect.left, m_LowerRect.bottom);

    // Bottom
    dc->LineTo(m_LowerRect.right, m_LowerRect.bottom);

    // Right side
    dc->LineTo(m_LowerRect.right, m_LowerRect.top);
    dc->LineTo(m_UpperRect.right, m_UpperRect.bottom);
    dc->LineTo(m_UpperRect.right, m_UpperRect.top);

    // Top
    dc->LineTo(m_UpperRect.left, m_UpperRect.top);
}


// Calculate rectangular area to invalidate for this key
void CPianoCtrl::CWhiteKeyMiddle::CalcInvalidRect(CRect &Rect)
{
    Rect.top    = m_UpperRect.top;
    Rect.bottom = m_LowerRect.bottom;
    Rect.left   = m_LowerRect.left;
    Rect.right  = m_LowerRect.right;
}


//---------------------------------------------------------------------
// CWhiteKeyRight class implementation
//---------------------------------------------------------------------


// Constructor
CPianoCtrl::CWhiteKeyRight::CWhiteKeyRight(double UnitLength, int Width, 
                                           double Position)
{
    // Initialize upper portion of this key
    m_UpperRect.top    = 0;
    m_UpperRect.bottom = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_UpperRect.left   = static_cast<long>(Position + UnitLength);
    m_UpperRect.right  = static_cast<long>
        (Position + UnitLength * UNIT_PER_NAT_KEY);

    // Initialize lower portion of this key
    m_LowerRect.top    = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_LowerRect.bottom = Width - 1;
    m_LowerRect.left   = static_cast<long>(Position);
    m_LowerRect.right  = static_cast<long>
        (Position + UnitLength * UNIT_PER_NAT_KEY);
}


// Hit detection
bool CPianoCtrl::CWhiteKeyRight::IsPointInKey(const CPoint &pt) const
{
    return (IsPointInRect(pt, m_UpperRect) || 
            IsPointInRect(pt, m_LowerRect));
}


// Turns note on
void CPianoCtrl::CWhiteKeyRight::NoteOn(COLORREF NoteOnColor, 
                                        CRect &Rect)
{
    m_NoteOnFlag = true;
    m_NoteOnColor = NoteOnColor;

    CalcInvalidRect(Rect);
}


// Turns note off
void CPianoCtrl::CWhiteKeyRight::NoteOff(CRect &Rect)
{
    m_NoteOnFlag = false;

    CalcInvalidRect(Rect);
}


// Paints key
void CPianoCtrl::CWhiteKeyRight::Paint(CDC *dc)
{
    //
    // Fill key
    //

    // Note is on
    if(m_NoteOnFlag)
    {
        dc->FillSolidRect(&m_UpperRect, m_NoteOnColor);
        dc->FillSolidRect(&m_LowerRect, m_NoteOnColor);
    }
    // Note is off
    else
    {
        dc->FillSolidRect(&m_UpperRect, RGB(250, 250, 250));
        dc->FillSolidRect(&m_LowerRect, RGB(250, 250, 250));
    }

    dc->SelectStockObject(BLACK_PEN);

    // 
    // Draw border
    //

    // Left side
    dc->MoveTo(m_UpperRect.left, m_UpperRect.top);
    dc->LineTo(m_UpperRect.left, m_UpperRect.bottom);
    dc->LineTo(m_LowerRect.left, m_LowerRect.top);
    dc->LineTo(m_LowerRect.left, m_LowerRect.bottom);

    // Bottom
    dc->LineTo(m_LowerRect.right, m_LowerRect.bottom);

    // Right side
    dc->LineTo(m_LowerRect.right, m_UpperRect.top);

    // Top
    dc->LineTo(m_UpperRect.left, m_UpperRect.top);
}


// Calculates rectangular area to invalidate for this key
void CPianoCtrl::CWhiteKeyRight::CalcInvalidRect(CRect &Rect)
{
    Rect.top    = m_UpperRect.top;
    Rect.bottom = m_LowerRect.bottom;
    Rect.left   = m_LowerRect.left;
    Rect.right  = m_LowerRect.right;
}


//---------------------------------------------------------------------
// CWhiteKeyFull class implementation
//---------------------------------------------------------------------


// Constructor
CPianoCtrl::CWhiteKeyFull::CWhiteKeyFull(double UnitLength, int Width, 
                                         double Position)
{
    // Initialize this key's rectangular area
    m_Rect.top    = 0;
    m_Rect.bottom = Width - 1;
    m_Rect.left   = static_cast<long>(Position);
    m_Rect.right  = 
        static_cast<long>(Position + UnitLength * UNIT_PER_NAT_KEY);
}


// Hit detection
bool CPianoCtrl::CWhiteKeyFull::IsPointInKey(const CPoint &pt) const
{
    return (IsPointInRect(pt, m_Rect));
}


// Turns note on
void CPianoCtrl::CWhiteKeyFull::NoteOn(COLORREF NoteOnColor, CRect &Rect)
{
    m_NoteOnFlag = true;
    m_NoteOnColor = NoteOnColor;

    Rect = m_Rect;
}


// Turns note off
void CPianoCtrl::CWhiteKeyFull::NoteOff(CRect &Rect)
{
    m_NoteOnFlag = false;

    Rect = m_Rect;
}


// Paints this key
void CPianoCtrl::CWhiteKeyFull::Paint(CDC *dc)
{
    //
    // Fill key
    //

    // Note is on
    if(m_NoteOnFlag)
    {
        dc->FillSolidRect(&m_Rect, m_NoteOnColor);
    }
    // Note is off
    else
    {
        dc->FillSolidRect(&m_Rect, RGB(250, 250, 250));
    }

    dc->SelectStockObject(BLACK_PEN);

    // 
    // Draw border
    //

    // Left side
    dc->MoveTo(m_Rect.left, m_Rect.top);
    dc->LineTo(m_Rect.left, m_Rect.bottom);

    // Bottom
    dc->LineTo(m_Rect.right, m_Rect.bottom);

    // Right side
    dc->LineTo(m_Rect.right, m_Rect.top);

    // Top
    dc->LineTo(m_Rect.left, m_Rect.top);
}


//---------------------------------------------------------------------
// CBlackKey class implementation
//---------------------------------------------------------------------


// Constructor
CPianoCtrl::CBlackKey::CBlackKey(double UnitLength, int Width, 
                                 double Position)
{
    // Initialize this key's rectangular area
    m_Rect.top    = 0;
    m_Rect.bottom = static_cast<long>(Width * BLACK_KEY_OFFSET);
    m_Rect.left   = static_cast<long>(Position);
    m_Rect.right  = static_cast<long>
        (Position + UnitLength * (UNIT_PER_NAT_KEY - 1));
}


// Hit detection
bool CPianoCtrl::CBlackKey::IsPointInKey(const CPoint &pt) const
{
    return (IsPointInRect(pt, m_Rect));
}


// Turns note on
void CPianoCtrl::CBlackKey::NoteOn(COLORREF NoteOnColor, CRect &Rect)
{
    m_NoteOnFlag = true;
    m_NoteOnColor = NoteOnColor;

    Rect = m_Rect;
}


// Turns note off
void CPianoCtrl::CBlackKey::NoteOff(CRect &Rect)
{
    m_NoteOnFlag = false;

    Rect = m_Rect;
}


// Paints this key
void CPianoCtrl::CBlackKey::Paint(CDC *dc)
{
    //
    // Fill key
    //

    // Note is on
    if(m_NoteOnFlag)
    {
        dc->FillSolidRect(&m_Rect, m_NoteOnColor);
    }
    // Note is off
    else
    {
        dc->FillSolidRect(&m_Rect, RGB(0, 0, 0));
    }

    dc->SelectStockObject(BLACK_PEN);

    // 
    // Draw border
    //

    // Left side
    dc->MoveTo(m_Rect.left, m_Rect.top);
    dc->LineTo(m_Rect.left, m_Rect.bottom);

    // Bottom
    dc->LineTo(m_Rect.right, m_Rect.bottom);

    // Right side
    dc->LineTo(m_Rect.right, m_Rect.top);

    // Top
    dc->LineTo(m_Rect.left, m_Rect.top);
}

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This article, along with any associated source code and files, is licensed under The MIT License

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About the Author

Leslie Sanford

United States United States
Aside from dabbling in BASIC on his old Atari 1040ST years ago, Leslie's programming experience didn't really begin until he discovered the Internet in the late 90s. There he found a treasure trove of information about two of his favorite interests: MIDI and sound synthesis.
 
After spending a good deal of time calculating formulas he found on the Internet for creating new sounds by hand, he decided that an easier way would be to program the computer to do the work for him. This led him to learn C. He discovered that beyond using programming as a tool for synthesizing sound, he loved programming in and of itself.
 
Eventually he taught himself C++ and C#, and along the way he immersed himself in the ideas of object oriented programming. Like many of us, he gotten bitten by the design patterns bug and a copy of GOF is never far from his hands.
 
Now his primary interest is in creating a complete MIDI toolkit using the C# language. He hopes to create something that will become an indispensable tool for those wanting to write MIDI applications for the .NET framework.
 
Besides programming, his other interests are photography and playing his Les Paul guitars.

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