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{
Shows a large black area where midi note/controller events are shown
just to monitor midi activity (for the MidiPlayer)
version 1.0 first release
for comments/bugs
F.Bouwmans
fbouwmans@spiditel.nl
if you think this component is nice and you use it, sent me a short email.
I've seen that other of my components have been downloaded a lot, but I've
got no clue wether they are actually used.
Don't worry because you are free to use these components
}
unit MidiScope;
interface
{$IFDEF FPC}
{$MODE Delphi}
{$H+} // use long strings
{$ENDIF}
uses
Windows,
Messages,
SysUtils,
Classes,
Graphics,
Controls,
Forms,
Dialogs;
type
TMidiScope = class(TGraphicControl)
private
{ Private declarations }
protected
{ Protected declarations }
notes: array[0..15,0..127] of integer;
controllers: array[0..15,0..17] of integer;
aftertouch: array[0..15,0..127] of integer;
selectedChannel: integer;
procedure PaintSlide(ch, pos, val: integer);
procedure NoteOn(channel, note, speed: integer);
procedure Controller(channel, number, value: integer);
procedure AfterTch(channel, note, value: integer);
public
{ Public declarations }
constructor Create(AOwner: TComponent); override;
procedure MidiEvent(event, data1, data2: integer);
procedure Paint; override;
published
{ Published declarations }
end;
procedure Register;
const
BarHeight = 16;
BarHeightInc = BarHeight + 2;
BarWidth = 3;
BarWidthInc = BarWidth + 1;
HeightDiv = 128 div BarHeight;
implementation
uses
MidiCons;
procedure Register;
begin
RegisterComponents('Synth', [TMidiScope]);
end;
constructor TMidiScope.Create(AOwner: TComponent);
var
i, j: integer;
begin
inherited Create(AOwner);
Height := BarHeightinc * 16 + 4;
Width := 147 * BarWidthInc + 4 + 20; // for channel number
for i := 0 to 15 do
for j := 0 to 127 do
begin
notes[i,j] := 0;
aftertouch[i,j] := 0;
end;
for i := 0 to 17 do
for j := 0 to 15 do
controllers[i,j] := 0;
end;
procedure TMidiScope.PaintSlide(ch, pos, val: integer);
var
x, y:integer;
begin
Canvas.Brush.Color := clBlack;
Canvas.Pen.color := clBlack;
x := pos * BarWidthInc + 2;
y := 2 + ch * BarHeightInc;
Canvas.Rectangle(x, y, x + BarWidthInc, y + BarHeightInc);
Canvas.Brush.Color := clGreen;
Canvas.Pen.Color := clGreen;
Canvas.Rectangle(x, y + (BarHeight - (val div HeightDiv)), x + BarWidth, y + BarHeight)
end;
procedure TMidiScope.Paint;
var
i, j: integer;
x: integer;
begin
Canvas.Brush.color := clBlack;
Canvas.Rectangle(0, 0, Width, Height);
Canvas.Pen.Color := clGreen;
x := 128 * BarWidthInc + 2;
Canvas.MoveTo(x, 0);
Canvas.LineTo(x, Height);
x := 148 * BarWIdthInc + 2;
canvas.Font.Color := clGreen;
for i := 0 to 15 do
Canvas.TextOut(x, ((i + 1) * BarHeightInc) - Canvas.font.size - 3, IntToStr(i + 1));
canvas.Pen.color := clBlack;
for j := 0 to 127 do
PaintSlide(i, j, notes[i,j]);
for j := 0 to 17 do
PaintSlide(i, j + 129, controllers[i,j]);
end;
procedure TMidiScope.NoteOn(channel, note, speed: integer);
begin
notes[channel,note] := speed;
PaintSlide(channel, note, notes[channel,note]);
end;
procedure TMidiScope.AfterTch(channel, note, value: integer);
begin
aftertouch[channel,note] := value;
end;
procedure TMidiScope.Controller(channel, number, value: integer);
var
i: integer;
begin
if number < 18 then
begin
controllers[channel,number] := value;
PaintSlide(channel, number + 129, value);
end
else if number >= $7B then
begin
// all notes of for channel
for i := 0 to 127 do
if notes[channel,i] > 0 then
begin
notes[channel,i] := 0;
PaintSlide(channel, i, 0);
end;
end;
end;
procedure TMidiScope.MidiEvent(event, data1, data2: integer);
begin
case (event and $F0) of
MIDI_NOTEON : NoteOn ((event and $F), data1, data2);
MIDI_NOTEOFF: NoteOn ((event and $F), data1, 0 );
MIDI_CONTROLCHANGE: Controller((event and $F), data1, data2);
MIDI_CHANAFTERTOUCH: Controller((Event and $F), 16, data1);
MIDI_PITCHBEND: Controller((Event and $F), 17, data2);
MIDI_KEYAFTERTOUCH: ;
end;
end;
end.
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