/
obj_matrix.c
113 lines (103 loc) · 3.39 KB
/
obj_matrix.c
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/* Copyright (C) 2007-2008 Geoff Richards
* Copyright (C) 2010-2011 Uli Schlachter
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
static int
cairmat_create (lua_State *L) {
cairo_matrix_t mat;
cairo_matrix_init_identity(&mat);
create_lua_matrix(L, &mat);
return 1;
}
static int
cairmat_invert (lua_State *L) {
cairo_matrix_t mat;
from_lua_matrix(L, &mat, 1);
if (cairo_matrix_invert(&mat) == CAIRO_STATUS_INVALID_MATRIX)
luaL_error(L, "matrix has no inverse");
to_lua_matrix(L, &mat, 1);
return 0;
}
static int
cairmat_multiply (lua_State *L) {
cairo_matrix_t m1, m2;
from_lua_matrix(L, &m1, 1);
from_lua_matrix(L, &m2, 2);
cairo_matrix_multiply(&m1, &m1, &m2);
to_lua_matrix(L, &m1, 1);
return 0;
}
static int
cairmat_rotate (lua_State *L) {
cairo_matrix_t mat;
from_lua_matrix(L, &mat, 1);
cairo_matrix_rotate(&mat, luaL_checknumber(L, 2));
to_lua_matrix(L, &mat, 1);
return 0;
}
static int
cairmat_scale (lua_State *L) {
cairo_matrix_t mat;
from_lua_matrix(L, &mat, 1);
cairo_matrix_scale(&mat, luaL_checknumber(L, 2), luaL_checknumber(L, 3));
to_lua_matrix(L, &mat, 1);
return 0;
}
static int
cairmat_transform_distance (lua_State *L) {
cairo_matrix_t mat;
double x = luaL_checknumber(L, 2), y = luaL_checknumber(L, 3);
from_lua_matrix(L, &mat, 1);
cairo_matrix_transform_distance(&mat, &x, &y);
lua_pushnumber(L, x);
lua_pushnumber(L, y);
return 2;
}
static int
cairmat_transform_point (lua_State *L) {
cairo_matrix_t mat;
double x = luaL_checknumber(L, 2), y = luaL_checknumber(L, 3);
from_lua_matrix(L, &mat, 1);
cairo_matrix_transform_point(&mat, &x, &y);
lua_pushnumber(L, x);
lua_pushnumber(L, y);
return 2;
}
static int
cairmat_translate (lua_State *L) {
cairo_matrix_t mat;
from_lua_matrix(L, &mat, 1);
cairo_matrix_translate(&mat, luaL_checknumber(L, 2),
luaL_checknumber(L, 3));
to_lua_matrix(L, &mat, 1);
return 0;
}
static const luaL_Reg
cairmat_methods[] = {
{ "invert", cairmat_invert },
{ "multiply", cairmat_multiply },
{ "rotate", cairmat_rotate },
{ "scale", cairmat_scale },
{ "transform_distance", cairmat_transform_distance },
{ "transform_point", cairmat_transform_point },
{ "translate", cairmat_translate },
{ 0, 0 }
};
/* vi:set ts=4 sw=4 expandtab: */