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uFont.pas
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uFont.pas
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unit uFont;
interface
uses Windows, OpenGL;
type
// tbv. regel indeling
TLineVAlignment = (laTop, laBottom {, laLeft, laRight});
const
// de verzameling characters in het OpenGL font
FirstCharacter = 32;
LastCharacter = 126;
N_Characters = LastCharacter - FirstCharacter + 1;
// tbv. regel indeling
DefLineSpacing = 0; //2/12; //2 pixels per 12px font verhouding
type
TGLFont = class(TObject)
private
// de eerste displaylist van een compleet font
DisplayListBase: GLuint;
// het true-type Windows font in 256 display-lists (voor elk character 1)
GMF: array[FirstCharacter..N_Characters-1] of GLYPHMETRICSFLOAT;
// geladen font instellingen
Family: string;
SizePx: integer; // de grootte van het font in pixels
is3D: boolean;
procedure PrintText(const Value: string);
published
public
// object
constructor Create;
destructor Destroy; override;
//
function CreateFontDLs(DC: HDC; RC: HGLRC; Fontname: string; FontSize: integer; Font3D: boolean) : GLuint;
procedure DeleteFont;
function IsFontLoaded : boolean;
// op pixel afstand vanaf de linker-onder hoek van het scherm
procedure PrintXY(X,Y: integer; const Value: string; ScrW,ScrH: integer);
procedure PrintXYZ(X,Y,Z: GLfloat; const Value: string);
// per regel afbeelden..vanaf boven, of vanaf beneden (Alignment)
procedure PrintLine(Row: integer; const Value: string; VAlign: TLineVAlignment; ScrW,ScrH: integer);
end;
// een verzameling fonts
TGLFonts = class(TObject)
private
fFonts: array of TGLFont;
function GetFont(I:integer) : TGLFont;
function GetFontCount : integer;
{procedure SetFont(I:integer; Value: TGLFont);}
published
// property Font[I:integer]:TGLFont read GetFont {write SetFont};
public
property Font[I:integer]:TGLFont read GetFont {write SetFont};
property FontCount:integer read GetFontCount;
// object
constructor Create;
destructor Destroy; override;
//
function AddFont(DC: HDC; RC: HGLRC; Fontname: string; FontSize: integer; Font3D: boolean) : GLuint;
end;
implementation
{ TGLFont }
constructor TGLFont.Create;
begin
DisplayListBase := 0; //ongeldige DisplayList handle
Family := '';
SizePx := 0;
is3D := false;
end;
destructor TGLFont.Destroy;
begin
DeleteFont;
//
inherited;
end;
function TGLFont.CreateFontDLs(DC: HDC; RC: HGLRC; Fontname: string; FontSize: integer; Font3D: boolean) : GLuint;
var F,F1: HFONT;
b: boolean;
begin
Family := Fontname;
SizePx := FontSize;
is3D := Font3D;
{wglMakeCurrent(DC, RC);}
glPushMatrix;
// displaylist handles reserveren..
DisplayListBase := glGenLists(N_Characters);
// maak een verwijzing naar het gewenste font (italic, underline, strike, weight,..)
F := CreateFont(FontSize, 0, 0, 0, FW_NORMAL, 0, 0, 0, ANSI_CHARSET, OUT_TT_PRECIS, CLIP_DEFAULT_PRECIS, ANTIALIASED_QUALITY, FF_DONTCARE + DEFAULT_PITCH, PChar(Fontname));
F1 := SelectObject(DC, F);
// 2D of 3D?
if Font3D then
// ==== outlined font ======================================================
// Maak een array van displaylists voor een true-type font.
// De glyphs 0..255 (256 in totaal) worden met een 0.05 extrusie een bepaalde
// 3D-"dikte" gegeven. De deviation staat standaard op 0.0, dwz. dat de
// characters net zo precies worden als het font.
//
// selecteer het font en glyphes aanmaken
b := wglUseFontOutlines(DC, FirstCharacter, N_Characters, DisplayListBase, 0.0, 0.05, WGL_FONT_POLYGONS, @GMF[FirstCharacter])
else
// ==== bitmapped font =====================================================
b := wglUseFontBitmaps(DC, FirstCharacter, N_Characters-1, DisplayListBase);
SelectObject(DC, F1);
DeleteObject(F);
if not b then
if DisplayListBase > 0 then begin
glDeleteLists(DisplayListBase, N_Characters);
DisplayListBase := 0;
Family := '';
{Msg("FontList is niet aangemaakt!");}
end;
glPopMatrix;
Result := DisplayListBase;
end;
procedure TGLFont.DeleteFont;
{var i: integer;}
begin
// DisplayLists wissen..
if DisplayListBase > 0 then glDeleteLists(DisplayListBase, N_Characters);
(*
if DisplayListBase > 0 then begin
for i:=0 to N_Characters-1 do
if glIsList(DisplayListBase+i) then glDeleteLists(DisplayListBase+i, 1);
end;
*)
DisplayListBase := 0;
Family := '';
SizePx := 0;
is3D := false;
end;
function TGLFont.IsFontLoaded: boolean;
begin
Result := (DisplayListBase<>0);
end;
procedure TGLFont.PrintText(const Value: string);
var L: integer;
begin
L := Length(Value);
glDisable(GL_LIGHTING);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
glPushAttrib(GL_LIST_BIT);
glListBase(DisplayListBase - FirstCharacter);
glCallLists(L, GL_UNSIGNED_BYTE, @Value[1]);
glPopAttrib;
end;
procedure TGLFont.PrintXY(X, Y: integer; const Value: string; ScrW,ScrH: integer);
begin
// glPushMatrix;
{glPushAttrib(GL_TRANSFORM_BIT or GL_VIEWPORT_BIT);}
glDisable(GL_DEPTH_TEST);
// orthogonaal afbeelden (geen perspectief)
glViewPort(0,0,ScrW,ScrH);
glMatrixMode(GL_PROJECTION);
glLoadIdentity;
glOrtho(0,ScrW, 0,ScrH, -1,1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity;
// de tekenpositie instellen en de tekst afbeelden
glRasterPos2i(X,Y); //een kleine correctie..
PrintText(Value);
//
{glPopAttrib;}
// glPopMatrix;
end;
procedure TGLFont.PrintLine(Row: integer; const Value: string; VAlign: TLineVAlignment; ScrW, ScrH: integer);
const MarginLeft=2; MarginBottom=2;
var LineHeight, NLines,NLines1, DeltaPx,
X,Y: integer;
begin
// bereken het aantal regels met de huidige viewport dimensies
LineHeight := SizePx + Round(DefLineSpacing);
NLines := ScrH div LineHeight;
DeltaPx := ScrH - (NLines * LineHeight);
NLines1 := NLines - 1;
// regel nog in beeld?
if (Row<0) or (Row>NLines1) then Exit;
// positie vanaf links
X := MarginLeft;
// regel vanaf boven? of onder?..
case VAlign of
laTop : Y := (NLines1-Row)*LineHeight + DeltaPx;
laBottom : Y := Row*LineHeight;
end;
Y := Y + MarginBottom;
PrintXY(X,Y, Value, ScrW,ScrH);
end;
procedure TGLFont.PrintXYZ(X, Y, Z: GLfloat; const Value: string);
begin
glPushMatrix;
glFrontFace(GL_CW);
glCullFace(GL_BACK);
glEnable(GL_CULL_FACE);
//
glRasterPos3f(X,Y,Z);
PrintText(Value);
glPopMatrix;
end;
{--- TGLFonts -----------------------------------}
constructor TGLFonts.Create;
begin
SetLength(fFonts, 0);
end;
destructor TGLFonts.Destroy;
var f: integer;
begin
for f:=Low(fFonts) to High(fFonts) do
with fFonts[f] do begin
if IsFontLoaded then DeleteFont;
Free;
end;
SetLength(fFonts, 0);
//
inherited;
end;
// property
function TGLFonts.GetFont(I: integer): TGLFont;
begin
Result := nil;
if (I<Low(fFonts)) or (I>High(fFonts)) then Exit;
Result := fFonts[I];
end;
function TGLFonts.GetFontCount: integer;
begin
Result := Length(fFonts);
end;
function TGLFonts.AddFont(DC: HDC; RC: HGLRC; Fontname: string; FontSize: integer; Font3D: boolean): GLuint;
var Len: integer;
begin
Len := Length(fFonts);
SetLength(fFonts, Len+1);
fFonts[Len] := TGLFont.Create;
Result := fFonts[Len].CreateFontDLs(DC,RC, Fontname,FontSize, Font3D);
end;
end.