VectorFont

Load/Parse SVG Hershey font files. This is not intended to be a complete SVG library, quite the opposite. It is intended to be a small piece of code to simply parse these specific files. Currently, only the MOVETO and LINETO primitives are supported.

My intention is to add new formats as and when I need them.

Features

• Parses SVG hershey fonts.

Basic Usage

Hershey Font Parsing

Parse the font from either a string or a file into a vectorfont object.

#include "vectorfont/hershey.h"

std::unique_ptr<vectorfont::VectorFont> p_font = vectorfont::load_hershey_font("hershey_sans.svg");

Using the vectorfont

int posx		= 0;	// Text Position x
int posy		= 0;	// and y
int cx 			= 0;	// Cursor x
int cy			= 0;	// and y
const int size		= 32;	// Font Size
const int units_per_em	= p_font->unit_per_em; 

p_font->execute(
	"Hello VectorFont",
	[&](vectorfont::Primitive primitive,std::span<const int16_t> args)->bool
	{
		switch(primitive.command)
		{
			case vectorfont::command::MOVETO :
				if(args.size() >= 2)
				{
					cx = posx + ((size * args[0]) / units_per_em);
					cy = posy - ((size * args[1]) / units_per_em);
				}
				break;

			case vectorfont::command::LINETO :
				if(args.size() >= 2)
				{
					auto fx = cx;
					auto fy = cy;
					cx = position.x + ((size * args[0]) / units_per_em);
					cy = position.y - ((size * args[1]) / units_per_em);
					line(fx,fy,cx,cy);
				}
				break;

			case vectorfont::command::ADVANCE :
				if(args.size() >= 1)
					posx = posx + ((size * args[0]) / units_per_em);
				break;
		}
		return false;	// return false to indicate that we don't want to stop being called back.
	} );