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