www.pudn.com > 3dterrain.zip > bitmap_Font.cpp

#include "bitmap_font.h" 
 
Font::Font(char *file_name, int *error)					// Build Our Font Display List 
{ 
	float	cx;											// Holds Our X Character Coord 
	float	cy;											// Holds Our Y Character Coord 
	*error = !LoadGLTextures(file_name, &number_texture); 
	if(*error)return; 
 
	base=glGenLists(256);								// Creating 256 Display Lists 
	glBindTexture(GL_TEXTURE_2D, number_texture);		// Select Our Font Texture 
	for (loop=0; loop<256; loop++)						// Loop Through All 256 Lists 
	{ 
		cx=float(loop%16)/16.0f;						// X Position Of Current Character 
		cy=float(loop/16)/16.0f;						// Y Position Of Current Character 
 
		glNewList(base+loop,GL_COMPILE);				// Start Building A List 
			glBegin(GL_QUADS);							// Use A Quad For Each Character 
				glTexCoord2f(cx,1.0f-cy-0.0625f);		// Texture Coord (Bottom Left) 
				glVertex2i(0,0);						// Vertex Coord (Bottom Left) 
				glTexCoord2f(cx+0.0625f,1.0f-cy-0.0625f);	// Texture Coord (Bottom Right) 
				glVertex2i(16,0);						// Vertex Coord (Bottom Right) 
				glTexCoord2f(cx+0.0625f,1.0f-cy);		// Texture Coord (Top Right) 
				glVertex2i(16,16);						// Vertex Coord (Top Right) 
				glTexCoord2f(cx,1.0f-cy);				// Texture Coord (Top Left) 
				glVertex2i(0,16);						// Vertex Coord (Top Left) 
			glEnd();									// Done Building Our Quad (Character) 
			glTranslatef(11,0,0);	//10,0,0			// Move To The Right Of The Character 
		glEndList();									// Done Building The Display List 
	}													// Loop Until All 256 Are Built 
} 
 
Font::~Font(GLvoid)									// Delete The Font From Memory 
{ 
	glDeleteLists(base,256);							// Delete All 256 Display Lists 
	glDeleteTextures( 1, &number_texture ); 
} 
 
GLvoid Font::glPrint_xy(GLint x, GLint y, char *string, int set)	// Where The Printing Happens 
{ 
	if (set>1)set=1; 
	glBlendFunc(GL_SRC_ALPHA			,	GL_ONE_MINUS_SRC_COLOR);	// nastavenie miešania farieb 
//farba bodu = (pôvodná farba * ALPHA)	+	(kreslená farba - pôvodná farba) 
	glEnable(GL_BLEND);									// povolenie miešania farieb 
 
	glBindTexture(GL_TEXTURE_2D, number_texture);		// Select Our Font Texture 
	glDisable(GL_DEPTH_TEST);							// Disables Depth Testing 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPushMatrix();										// Store The Projection Matrix 
	glLoadIdentity();									// Reset The Projection Matrix 
	glOrtho(0,screen_x_font,0,screen_y_font,-1,1);				// Set Up An Ortho Screen 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPushMatrix();										// Store The Modelview Matrix 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslated(x,y,0);								// Position The Text (0,0 - Bottom Left) 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glEnable(GL_DEPTH_TEST);							// Enables Depth Testing 
 
	glDisable(GL_BLEND);								//vypnutie miešania farieb 
 
} 
 
GLvoid Font::glPrint(GLint x, GLint y, char *string, int set)	// Where The Printing Happens 
{ 
	x = x*11;											// vypocet x zo suradnice stlpca 
	y = screen_y_font - (y+1)*16;							// vypocet y zo suradnice riadka 
	 
	if (set>1)set=1; 
	glBlendFunc(GL_SRC_ALPHA			,	GL_ONE_MINUS_SRC_COLOR);	// nastavenie miešania farieb 
//farba bodu = (pôvodná farba * ALPHA)	+	(kreslená farba - pôvodná farba) 
	glEnable(GL_BLEND);									// povolenie miešania farieb 
 
	glBindTexture(GL_TEXTURE_2D, number_texture);		// Select Our Font Texture 
	glDisable(GL_DEPTH_TEST);							// Disables Depth Testing 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPushMatrix();										// Store The Projection Matrix 
	glLoadIdentity();									// Reset The Projection Matrix 
	glOrtho(0,screen_x_font,0,screen_y_font,-1,1);				// Set Up An Ortho Screen 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPushMatrix();										// Store The Modelview Matrix 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glEnable(GL_DEPTH_TEST);							// Enables Depth Testing 
 
	glDisable(GL_BLEND);								//vypnutie miešania farieb 
 
} 
 
void Font::Begin() 
{ 
	glBlendFunc(GL_SRC_ALPHA			,	GL_ONE_MINUS_SRC_COLOR);	// nastavenie miešania farieb 
//farba bodu = (pôvodná farba * ALPHA)	+	(kreslená farba - pôvodná farba) 
	glEnable(GL_BLEND); 
	glBindTexture(GL_TEXTURE_2D, number_texture);		// Select Our Font Texture 
	glDisable(GL_DEPTH_TEST);							// Disables Depth Testing 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPushMatrix();										// Store The Projection Matrix 
	glLoadIdentity();									// Reset The Projection Matrix 
	glOrtho(0,screen_x_font,0,screen_y_font,-1,1);				// Set Up An Ortho Screen 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPushMatrix();										// Store The Modelview Matrix 
} 
 
void Font::End() 
{ 
	glMatrixMode(GL_PROJECTION);						// Select The Projection Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glMatrixMode(GL_MODELVIEW);							// Select The Modelview Matrix 
	glPopMatrix();										// Restore The Old Projection Matrix 
	glEnable(GL_DEPTH_TEST);							// Enables Depth Testing 
	glDisable(GL_BLEND);								// vypnutie miešania farieb 
} 
 
void Font::Print(GLint x, GLint y, char * string, int set) 
{ 
	x = x*11;											// vypocet x zo suradnice stlpca 
	y = screen_y_font - (y+1)*16;							// vypocet y zo suradnice riadka 
 
	if (set>1)set=1; 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
} 
 
void Font::Print_scale(GLint x, GLint y, char * string, int set,float scale_x,float scale_y) 
{ 
	x = x*11;											// vypocet x zo suradnice stlpca 
	y = screen_y_font - (y+1)*16;							// vypocet y zo suradnice riadka 
 
	if (set>1)set=1; 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glScalef(scale_x,scale_y,1.0f); 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
} 
 
void Font::Print_xy(GLint x, GLint y, char *string, int set) 
{ 
	if (set>1)set=1; 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
} 
 
void Font::Print_xy_scale(GLint x, GLint y, char *string, int set,float scale_x,float scale_y) 
{ 
	if (set>1)set=1; 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glScalef(scale_x,scale_y,1.0f); 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
} 
 
void Font::Print_xy_rot(GLint x, GLint y, char *string, int set,float uhol,float scale) 
{ 
	if (set>1)set=1; 
	glLoadIdentity();									// Reset The Modelview Matrix 
	glTranslatef((float)x,(float)y,0);					// Position The Text (0,0 - Bottom Left) 
	glRotatef(uhol,0,0,1); 
	glScalef(scale,1.0f,1.0f); 
	glListBase(base-32+(128*set));						// Choose The Font Set (0 or 1) 
	glCallLists(strlen(string),GL_BYTE,string);			// Write The Text To The Screen 
} 
 
AUX_RGBImageRec* Font::LoadBMP(char *Filename)			// Načítanie bitmapového obrázka 
{ 
	FILE *File=NULL;								// smernik na subor 
 
	if (!Filename)return NULL;						// skúška či meno súboru bolo zadané 
	File=fopen(Filename,"r");						// otvorenie súboru na čítanie 
	if (File)										// existuje súbor ? 
	{ 
		fclose(File);								// Uzatvorenie súbora 
		return auxDIBImageLoad(Filename);			// Načíta obrázok a vráti pointer 
	} 
	return NULL;									// Ak sa obrázok nenačítal vráti NULL 
} 
 
int Font::LoadGLTextures(char *texture_name,GLuint *texture)				// Načíta obrázok a uloži ako textury 
{ 
	int Status=TRUE;								// indikator 
	AUX_RGBImageRec *TextureImage;					// miesto pre štruktúru 
 
	TextureImage=NULL; 
	if (TextureImage=LoadBMP(texture_name)) 
	{ 
		glGenTextures(1, texture); 
		glBindTexture(GL_TEXTURE_2D, *texture); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR); 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP );		// nastavuje za textury sa v smere u (vodorovnom) neopakuju 
		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_CLAMP );		// nastavuje za textury sa v smere v (zvislom) neopakuju 
		glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage->sizeX, TextureImage->sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage->data); 
	} 
	else  
	{	MessageBox(NULL,"Chyba načítania obrázka.",texture_name,MB_ICONERROR);Status=false;} 
 
	if (TextureImage)									// Ak textura existuje 
	{ 
		if (TextureImage->data)free(TextureImage->data);// ak existuju data uvoľni z pamäte 
		free(TextureImage);								// uvoľni štruktúru 
	} 
	return Status; 
}