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Export more cairo methods to Lua.

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This commit is contained in:
Přemysl Eric Janouch 2011-01-07 09:23:02 +01:00
parent 6b5bae881c
commit fda123249a
1 changed files with 131 additions and 45 deletions
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176
src/ld-lua.c
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@ -77,6 +77,7 @@ struct _LdLuaDrawData
{
LdLuaSymbol *symbol;
cairo_t *cr;
unsigned save_count;
};
static void ld_lua_finalize (GObject *gobject);
@ -91,16 +92,26 @@ static int process_registration (lua_State *L);
static gchar *get_translation (lua_State *L, int index);
static gboolean read_symbol_area (lua_State *L, int index, LdSymbolArea *area);
static void push_cairo_object (lua_State *L, cairo_t *cr);
static void push_cairo_object (lua_State *L, LdLuaDrawData *draw_data);
static gdouble get_cairo_scale (cairo_t *cr);
static int ld_lua_cairo_save (lua_State *L);
static int ld_lua_cairo_restore (lua_State *L);
static int ld_lua_cairo_get_line_width (lua_State *L);
static int ld_lua_cairo_set_line_width (lua_State *L);
static int ld_lua_cairo_move_to (lua_State *L);
static int ld_lua_cairo_line_to (lua_State *L);
static int ld_lua_cairo_curve_to (lua_State *L);
static int ld_lua_cairo_arc (lua_State *L);
static int ld_lua_cairo_arc_negative (lua_State *L);
static int ld_lua_cairo_new_path (lua_State *L);
static int ld_lua_cairo_new_sub_path (lua_State *L);
static int ld_lua_cairo_close_path (lua_State *L);
static int ld_lua_cairo_stroke (lua_State *L);
static int ld_lua_cairo_stroke_preserve (lua_State *L);
static int ld_lua_cairo_fill (lua_State *L);
static int ld_lua_cairo_fill_preserve (lua_State *L);
static int ld_lua_cairo_clip (lua_State *L);
static int ld_lua_cairo_clip_preserve (lua_State *L);
static luaL_Reg ld_lua_logdiag_lib[] =
@ -111,14 +122,24 @@ static luaL_Reg ld_lua_logdiag_lib[] =
static luaL_Reg ld_lua_cairo_table[] =
{
{"save", ld_lua_cairo_save},
{"restore", ld_lua_cairo_restore},
{"get_line_width", ld_lua_cairo_get_line_width},
{"set_line_width", ld_lua_cairo_set_line_width},
{"move_to", ld_lua_cairo_move_to},
{"line_to", ld_lua_cairo_line_to},
{"curve_to", ld_lua_cairo_curve_to},
{"arc", ld_lua_cairo_arc},
{"arc_negative", ld_lua_cairo_arc_negative},
{"new_path", ld_lua_cairo_new_path},
{"new_sub_path", ld_lua_cairo_new_sub_path},
{"close_path", ld_lua_cairo_close_path},
{"stroke", ld_lua_cairo_stroke},
{"stroke_preserve", ld_lua_cairo_stroke_preserve},
{"fill", ld_lua_cairo_fill},
{"fill_preserve", ld_lua_cairo_fill_preserve},
{"clip", ld_lua_cairo_clip},
{"clip_preserve", ld_lua_cairo_clip_preserve},
{NULL, NULL}
};
@ -304,12 +325,16 @@ ld_lua_private_draw (LdLua *self, LdLuaSymbol *symbol, cairo_t *cr)
data.symbol = symbol;
data.cr = cr;
data.save_count = 0;
if (lua_cpcall (self->priv->L, ld_lua_private_draw_cb, &data))
{
g_warning ("Lua error: %s", lua_tostring (self->priv->L, -1));
lua_pop (self->priv->L, 1);
}
while (data.save_count--)
cairo_restore (cr);
}
static int
@ -329,7 +354,7 @@ ld_lua_private_draw_cb (lua_State *L)
luaL_checktype (L, -1, LUA_TFUNCTION);
/* Call the function do draw the symbol. */
push_cairo_object (L, data->cr);
push_cairo_object (L, data);
lua_pcall (L, 1, 0, 0);
return 0;
}
@ -541,7 +566,7 @@ read_symbol_area (lua_State *L, int index, LdSymbolArea *area)
/* ===== Cairo ============================================================= */
static void
push_cairo_object (lua_State *L, cairo_t *cr)
push_cairo_object (lua_State *L, LdLuaDrawData *draw_data)
{
luaL_Reg *fn;
@ -556,7 +581,7 @@ push_cairo_object (lua_State *L, cairo_t *cr)
*/
for (fn = ld_lua_cairo_table; fn->name; fn++)
{
lua_pushlightuserdata (L, cr);
lua_pushlightuserdata (L, draw_data);
lua_pushcclosure (L, fn->func, 1);
lua_setfield (L, -2, fn->name);
}
@ -571,98 +596,159 @@ get_cairo_scale (cairo_t *cr)
return dx;
}
/* TODO: More functions. Possibly put it into another file
* and generate it automatically.
*/
#define LD_LUA_CAIRO_TRIVIAL(name) \
static int \
ld_lua_cairo_ ## name (lua_State *L) \
{ \
LdLuaDrawData *data; \
data = lua_touserdata (L, lua_upvalueindex (1)); \
cairo_ ## name (data->cr); \
return 0; \
}
LD_LUA_CAIRO_TRIVIAL (new_path)
LD_LUA_CAIRO_TRIVIAL (new_sub_path)
LD_LUA_CAIRO_TRIVIAL (close_path)
LD_LUA_CAIRO_TRIVIAL (stroke)
LD_LUA_CAIRO_TRIVIAL (stroke_preserve)
LD_LUA_CAIRO_TRIVIAL (fill)
LD_LUA_CAIRO_TRIVIAL (fill_preserve)
LD_LUA_CAIRO_TRIVIAL (clip)
LD_LUA_CAIRO_TRIVIAL (clip_preserve)
static int
ld_lua_cairo_save (lua_State *L)
{
LdLuaDrawData *data;
data = lua_touserdata (L, lua_upvalueindex (1));
if (data->save_count + 1)
{
data->save_count++;
cairo_save (data->cr);
}
return 0;
}
static int
ld_lua_cairo_restore (lua_State *L)
{
LdLuaDrawData *data;
data = lua_touserdata (L, lua_upvalueindex (1));
if (data->save_count)
{
data->save_count--;
cairo_restore (data->cr);
}
return 0;
}
static int
ld_lua_cairo_get_line_width (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
cr = lua_touserdata (L, lua_upvalueindex (1));
lua_pushnumber (L, cairo_get_line_width (cr) * get_cairo_scale (cr));
data = lua_touserdata (L, lua_upvalueindex (1));
lua_pushnumber (L, cairo_get_line_width (data->cr)
* get_cairo_scale (data->cr));
return 1;
}
static int
ld_lua_cairo_set_line_width (lua_State *L)
{
cairo_t *cr;
lua_Number width;
LdLuaDrawData *data;
cr = lua_touserdata (L, lua_upvalueindex (1));
width = luaL_checknumber (L, 1);
cairo_set_line_width (cr, width / get_cairo_scale (cr));
data = lua_touserdata (L, lua_upvalueindex (1));
cairo_set_line_width (data->cr, luaL_checknumber (L, 1)
/ get_cairo_scale (data->cr));
return 0;
}
static int
ld_lua_cairo_move_to (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
lua_Number x, y;
cr = lua_touserdata (L, lua_upvalueindex (1));
data = lua_touserdata (L, lua_upvalueindex (1));
x = luaL_checknumber (L, 1);
y = luaL_checknumber (L, 2);
cairo_move_to (cr, x, y);
cairo_move_to (data->cr, x, y);
return 0;
}
static int
ld_lua_cairo_line_to (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
lua_Number x, y;
cr = lua_touserdata (L, lua_upvalueindex (1));
data = lua_touserdata (L, lua_upvalueindex (1));
x = luaL_checknumber (L, 1);
y = luaL_checknumber (L, 2);
cairo_line_to (cr, x, y);
cairo_line_to (data->cr, x, y);
return 0;
}
static int
ld_lua_cairo_stroke (lua_State *L)
ld_lua_cairo_curve_to (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
lua_Number x1, y1, x2, y2, x3, y3;
cr = lua_touserdata (L, lua_upvalueindex (1));
cairo_stroke (cr);
data = lua_touserdata (L, lua_upvalueindex (1));
x1 = luaL_checknumber (L, 1);
y1 = luaL_checknumber (L, 2);
x2 = luaL_checknumber (L, 3);
y2 = luaL_checknumber (L, 4);
x3 = luaL_checknumber (L, 5);
y3 = luaL_checknumber (L, 6);
cairo_curve_to (data->cr, x1, y1, x2, y2, x3, y3);
return 0;
}
static int
ld_lua_cairo_stroke_preserve (lua_State *L)
ld_lua_cairo_arc (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
lua_Number xc, yc, radius, angle1, angle2;
cr = lua_touserdata (L, lua_upvalueindex (1));
cairo_stroke_preserve (cr);
data = lua_touserdata (L, lua_upvalueindex (1));
xc = luaL_checknumber (L, 1);
yc = luaL_checknumber (L, 2);
radius = luaL_checknumber (L, 3);
angle1 = luaL_checknumber (L, 4);
angle2 = luaL_checknumber (L, 5);
cairo_arc (data->cr, xc, yc, radius, angle1, angle2);
return 0;
}
static int
ld_lua_cairo_fill (lua_State *L)
ld_lua_cairo_arc_negative (lua_State *L)
{
cairo_t *cr;
LdLuaDrawData *data;
lua_Number xc, yc, radius, angle1, angle2;
cr = lua_touserdata (L, lua_upvalueindex (1));
cairo_fill (cr);
data = lua_touserdata (L, lua_upvalueindex (1));
xc = luaL_checknumber (L, 1);
yc = luaL_checknumber (L, 2);
radius = luaL_checknumber (L, 3);
angle1 = luaL_checknumber (L, 4);
angle2 = luaL_checknumber (L, 5);
cairo_arc_negative (data->cr, xc, yc, radius, angle1, angle2);
return 0;
}
static int
ld_lua_cairo_fill_preserve (lua_State *L)
{
cairo_t *cr;
cr = lua_touserdata (L, lua_upvalueindex (1));
cairo_fill_preserve (cr);
return 0;
}