108 lines
3.6 KiB
ObjectPascal
108 lines
3.6 KiB
ObjectPascal
unit osc_vis;
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{ Oscilloscope Visualyzation by Alessandro Cappellozza
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version 0.8 05/2002
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http://digilander.iol.it/Kappe/audioobject
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}
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interface
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uses Windows, Dialogs, Graphics, SysUtils, CommonTypes, Classes;
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type TOcilloScope = Class(TObject)
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private
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VisBuff : TBitmap;
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BackBmp : TBitmap;
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BkgColor : TColor;
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ScopeOff : Integer;
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PenColor : TColor;
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DrawType : Integer;
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DrawRes : Integer;
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FrmClear : Boolean;
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UseBkg : Boolean;
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public
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Constructor Create (Width, Height : Integer);
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procedure Draw(HWND : THandle; WaveData : TWaveData; X, Y : Integer);
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procedure SetBackGround (Active : Boolean; BkgCanvas : TGraphic);
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property BackColor : TColor read BkgColor write BkgColor;
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property Offset : Integer read ScopeOff write ScopeOff;
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property Pen : TColor read PenColor write PenColor;
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property Mode : Integer read DrawType write DrawType;
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property Res : Integer read DrawRes write DrawRes;
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property FrameClear : Boolean read FrmClear write FrmClear;
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end;
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var OcilloScope : TOcilloScope;
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implementation
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Constructor TOcilloScope.Create(Width, Height : Integer);
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begin
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VisBuff := TBitmap.Create;
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BackBmp := TBitmap.Create;
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VisBuff.Width := Width;
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VisBuff.Height := Height;
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BackBmp.Width := Width;
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BackBmp.Height := Height;
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BkgColor := clBlack;
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ScopeOff := 50;
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PenColor := clWhite;
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DrawType := 0;
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DrawRes := 1;
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FrmClear := True;
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UseBkg := False;
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end;
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procedure TOcilloScope.SetBackGround (Active : Boolean; BkgCanvas : TGraphic);
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begin
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UseBkg := Active;
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BackBmp.Canvas.Draw(0, 0, BkgCanvas);
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end;
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procedure TOcilloScope.Draw(HWND : THandle; WaveData : TWaveData; X, Y : Integer);
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var i, YPos : LongInt; R, L : SmallInt;
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begin
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if FrmClear then begin
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VisBuff.Canvas.Pen.Color := BkgColor;
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VisBuff.Canvas.Brush.Color := BkgColor;
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if UseBkg then
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BitBlt(VisBuff.Canvas.Handle, // Destination
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0, 0, // X, Y (target pos)
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VisBuff.Width, VisBuff.Height, // Size to copy
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BackBmp.Canvas.handle, // Source
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0, 0, // X, Y (source pos)
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SrcCopy) // plain copy
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else
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VisBuff.Canvas.Rectangle(0, 0, VisBuff.Width, VisBuff.Height) // only if no background
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end;
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VisBuff.Canvas.Pen.Color := PenColor;
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R := SmallInt(LOWORD(WaveData[0]));
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L := SmallInt(HIWORD(WaveData[0]));
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YPos := Trunc(((R + L) / (2 * 65535)) * ScopeOff) ;
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VisBuff.Canvas.MoveTo(X , Y + YPos);
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for i := 1 to 256 do begin
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R := SmallInt(Loword(WaveData[i * DrawRes]));
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L := SmallInt(HIword(WaveData[i * DrawRes]));
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YPos := Trunc(((R + L) / (2 * 65535)) * ScopeOff) ;
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case DrawType of
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0 : VisBuff.Canvas.lineto(X + i, Y + YPos);
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1 : begin
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VisBuff.Canvas.MoveTo(X + i, Y);
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VisBuff.Canvas.lineto(X + i, Y + YPos);
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end;
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2 : VisBuff.Canvas.Pixels[X + i, Y + YPos] := PenColor;
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end;
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end;
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BitBlt(HWND, 0, 0, VisBuff.Width, VisBuff.Height, VisBuff.Canvas.Handle, 0, 0, srccopy)
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end;
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end.
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