1 files changed, 198 insertions, 0 deletions
diff --git a/src/lib/midi/MidiScope.pas b/src/lib/midi/MidiScope.pas
new file mode 100644
index 00000000..afc20b0f
--- /dev/null
+++ b/src/lib/midi/MidiScope.pas
@@ -0,0 +1,198 @@
+{
+  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
+  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.