107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#ifndef __I_GUI_FONT_H_INCLUDED__
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#define __I_GUI_FONT_H_INCLUDED__
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#include "IReferenceCounted.h"
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#include "SColor.h"
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#include "rect.h"
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#include "irrString.h"
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namespace irr
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{
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namespace gui
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{
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//! An enum for the different types of GUI font.
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enum EGUI_FONT_TYPE
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{
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//! Bitmap fonts loaded from an XML file or a texture.
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EGFT_BITMAP = 0,
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//! Scalable vector fonts loaded from an XML file.
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/** These fonts reside in system memory and use no video memory
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until they are displayed. These are slower than bitmap fonts
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but can be easily scaled and rotated. */
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EGFT_VECTOR,
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//! A font which uses a the native API provided by the operating system.
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/** Currently not used. */
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EGFT_OS,
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//! An external font type provided by the user.
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EGFT_CUSTOM
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};
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//! Font interface.
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class IGUIFont : public virtual IReferenceCounted
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{
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public:
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//! Draws some text and clips it to the specified rectangle if wanted.
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/** \param text: Text to draw
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\param position: Rectangle specifying position where to draw the text.
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\param color: Color of the text
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\param hcenter: Specifies if the text should be centered horizontally into the rectangle.
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\param vcenter: Specifies if the text should be centered vertically into the rectangle.
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\param clip: Optional pointer to a rectangle against which the text will be clipped.
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If the pointer is null, no clipping will be done. */
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virtual void draw(const core::stringw& text, const core::rect<s32>& position,
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video::SColor color, bool hcenter=false, bool vcenter=false,
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const core::rect<s32>* clip=0) = 0;
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//! Calculates the width and height of a given string of text.
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/** \return Returns width and height of the area covered by the text if
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it would be drawn. */
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virtual core::dimension2d<u32> getDimension(const wchar_t* text) const = 0;
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//! Calculates the index of the character in the text which is on a specific position.
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/** \param text: Text string.
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\param pixel_x: X pixel position of which the index of the character will be returned.
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\return Returns zero based index of the character in the text, and -1 if no no character
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is on this position. (=the text is too short). */
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virtual s32 getCharacterFromPos(const wchar_t* text, s32 pixel_x) const = 0;
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//! Returns the type of this font
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virtual EGUI_FONT_TYPE getType() const { return EGFT_CUSTOM; }
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//! Sets global kerning width for the font.
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virtual void setKerningWidth (s32 kerning) = 0;
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//! Sets global kerning height for the font.
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virtual void setKerningHeight (s32 kerning) = 0;
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//! Gets kerning values (distance between letters) for the font. If no parameters are provided,
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/** the global kerning distance is returned.
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\param thisLetter: If this parameter is provided, the left side kerning
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for this letter is added to the global kerning value. For example, a
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space might only be one pixel wide, but it may be displayed as several
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pixels.
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\param previousLetter: If provided, kerning is calculated for both
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letters and added to the global kerning value. For example, in a font
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which supports kerning pairs a string such as 'Wo' may have the 'o'
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tucked neatly under the 'W'.
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*/
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virtual s32 getKerningWidth(const wchar_t* thisLetter=0, const wchar_t* previousLetter=0) const = 0;
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//! Returns the distance between letters
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virtual s32 getKerningHeight() const = 0;
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//! Define which characters should not be drawn by the font.
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/** For example " " would not draw any space which is usually blank in
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most fonts.
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\param s String of symbols which are not send down to the videodriver
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*/
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virtual void setInvisibleCharacters( const wchar_t *s ) = 0;
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virtual u32 addLazyLoadCharacters(const wchar_t *s) { return 0; }
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};
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} // end namespace gui
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} // end namespace irr
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#endif
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