retrieving a word-wrapped string

[decky]

hello,

i desire a function that, given a string, a width constraint, and a Font, returns a copy of the string with word wrapping applied. although Font:getWrap helpfully returns the number of lines that the text was wrapped to, it does not return the wrapped text itself. do you have a solution?

i have already accomplished this by modifying the source code for the getWrap function like so:

Code: Select all

/*modules/graphics/opengl/wrap_Font.cpp*/

int w_Font_getWrap(lua_State *L)
{
	Font *t = luax_checkfont(L, 1);
	const char *str = luaL_checkstring(L, 2);
	float wrap = (float) luaL_checknumber(L, 3);
	int max_width = 0, numlines = 0;
	std::vector<std::string> lines;

	luax_catchexcept(L, [&]() {
		lines = t->getWrap(str, wrap, &max_width);
		numlines = lines.size();
	});

	// return max width and number of lines
	lua_pushinteger(L, max_width);
	lua_pushinteger(L, numlines);

	// my addition: return a list of the lines
	lua_newtable(L);
	for (int i = 0; i<numlines; i++){
		lua_pushinteger(L, i+1);
		lua_pushstring(L, lines[i].c_str());
		lua_settable(L, -3);
	}

	return 3;
}

Code: Select all

myFont = love.graphics.newFont(18)
width, numLines, lines = myFont:getWrap("The quick brown fox jumps over the lazy dog.", 200)

print(lines[1]) # The quick brown fox

however, i don't consider maintaining my own fork of LÖVE to be an ideal solution, so i'd appreciate any alternatives.

for your curiosity: my main purpose for this is to create text boxes that have vertical margins and hide any lines of text that would flow beyond the margins.

[Nixola]

You'll either have to wait for 0.10.0 or, as you did, do it yourself. Before editing LÖVE's code, though, see if you can make it work via LuaJIT's FFI module.

[decky]

thanks for the reply. so this functionality is planned for 0.10? that's good to know...

i haven't used luajit's FFI library before, but doesn't it only work with c? if i have to declare every type and function that i use, then i can't work with Fonts, because Font is a c++ class and i can't declare it as a c struct.