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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
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
begin
for j := 0 to 127 do
begin
notes[i,j] := 0;
aftertouch[i,j] := 0;
end;
end;
for i := 0 to 17 do
begin
for j := 0 to 15 do
controllers[i,j] := 0;
end;
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;
begin
for j := 0 to 127 do
begin
PaintSlide(i,j,notes[i,j]);
end;
for j := 0 to 17 do
begin
PaintSlide(i,j+129,controllers[i,j]);
end;
end;
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
begin
if notes[channel,i] > 0 then
begin
notes[channel,i] := 0;
PaintSlide(channel,i,0);
end;
end;
end;
end;
procedure TMidiScope.MidiEvent(event,data1,data2 : integer);
begin
case (event AND $F0) of
MIDI_NOTEON :
begin
NoteOn((event AND $F),data1,data2);
end;
MIDI_NOTEOFF:
begin
NoteOn((event AND $F),data1,0);
end;
MIDI_CONTROLCHANGE :
begin
Controller((event AND $F),data1,data2);
end;
MIDI_CHANAFTERTOUCH:
begin
Controller((Event AND $F),16,Data1);
end;
MIDI_PITCHBEND:
begin
begin
Controller((Event AND $F),17,data2);
end;
end;
MIDI_KEYAFTERTOUCH:
begin
end;
end;
end;
end.
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