static void testTranslate() {
Matrix matrix;
matrix = Matrix_translated(Matrix_identity(), 3.0f, -1.5f, 1.0f);
assertMatrixApproximate(matrix, 1.0f, 0.0f, 0.0f, 3.0f,
0.0f, 1.0f, 0.0f, -1.5f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 0.0f, 1.0f, EPSILON);
matrix = Matrix_translated(Matrix_fromDirectionVectors(Vector3_init(0.0f, 1.0f, 0.0f),
Vector3_init(0.0f, 0.0f, 1.0f),
Vector3_init(1.0f, 0.0f, 0.0f)),
2.0f, 3.0f, -1.0f);
assertMatrixApproximate(matrix, 0.0f, 0.0f, 1.0f, -1.0f,
1.0f, 0.0f, 0.0f, 2.0f,
0.0f, 1.0f, 0.0f, 3.0f,
0.0f, 0.0f, 0.0f, 1.0f, EPSILON);
matrix = Matrix_identity();
Matrix_translate(&matrix, 3.0f, -1.5f, 1.0f);
assertMatrixApproximate(matrix, 1.0f, 0.0f, 0.0f, 3.0f,
0.0f, 1.0f, 0.0f, -1.5f,
0.0f, 0.0f, 1.0f, 1.0f,
0.0f, 0.0f, 0.0f, 1.0f, EPSILON);
matrix = Matrix_fromDirectionVectors(Vector3_init(0.0f, 1.0f, 0.0f),
Vector3_init(0.0f, 0.0f, 1.0f),
Vector3_init(1.0f, 0.0f, 0.0f));
Matrix_translate(&matrix, 2.0f, 3.0f, -1.0f);
assertMatrixApproximate(matrix, 0.0f, 0.0f, 1.0f, -1.0f,
1.0f, 0.0f, 0.0f, 2.0f,
0.0f, 1.0f, 0.0f, 3.0f,
0.0f, 0.0f, 0.0f, 1.0f, EPSILON);
}
static void
gezira_snowflake_render (gezira_snowflake_t *flake)
{
nile_Process_t *pipeline, *gate_, *COI;
Matrix_t M = Matrix ();
if (gezira_snowflake_offscreen (flake))
return;
M = Matrix_translate (M, WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2);
M = Matrix_scale (M, zoom, zoom);
M = Matrix_translate (M, -WINDOW_WIDTH / 2, -WINDOW_HEIGHT / 2);
M = Matrix_translate (M, flake->x, flake->y);
M = Matrix_rotate (M, flake->angle);
M = Matrix_scale (M, flake->scale, flake->scale);
COI = gezira_CompositeUniformColorOverImage_ARGB32 (init,
FLAKE_ALPHA, FLAKE_RED, FLAKE_GREEN, FLAKE_BLUE,
window.pixels, window.width, window.height, window.width);
gate_ = nile_Identity (init, 8);
nile_Process_gate (COI, gate_);
pipeline = nile_Process_pipe (
gezira_TransformBeziers (init, M.a, M.b, M.c, M.d, M.e, M.f),
gezira_ClipBeziers (init, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT),
gezira_Rasterize (init),
gate,
COI,
NILE_NULL);
nile_Process_feed (pipeline, snowflake_path, snowflake_path_n);
gate = gate_;
}
// Matrix operand to add a 3D translation to the Module.
void Module_translate(Module *md, double tx, double ty, double tz) {
Matrix m;
Element *e;
Matrix_identity(&m);
Matrix_translate(&m, tx, ty, tz);
e = Element_init(ObjMatrix, &m);
Module_insert(md, e);
}
static void
gezira_snowflake_render (gezira_snowflake_t *flake,
gezira_Window_t *window, nile_Process_t *init)
{
nile_Process_t *pipeline;
Matrix_t M = Matrix ();
if (gezira_snowflake_offscreen (flake))
return;
M = Matrix_translate (M, WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2);
M = Matrix_scale (M, zoom, zoom);
M = Matrix_translate (M, -WINDOW_WIDTH / 2, -WINDOW_HEIGHT / 2);
M = Matrix_translate (M, flake->x, flake->y);
M = Matrix_rotate (M, flake->angle);
M = Matrix_scale (M, flake->scale, flake->scale);
pipeline = nile_Process_pipe (
gezira_TransformBeziers (init, M.a, M.b, M.c, M.d, M.e, M.f),
gezira_ClipBeziers (init, 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT),
gezira_Rasterize (init),
gezira_CompositeUniformColorOverImage_ARGB32 (init,
&window->image,
FLAKE_ALPHA, FLAKE_RED, FLAKE_GREEN, FLAKE_BLUE),
NILE_NULL);
nile_Process_feed (pipeline, snowflake_path, snowflake_path_n);
}
Matrix Matrix_translated(Matrix matrix, float x, float y, float z) {
Matrix_translate(&matrix, x, y, z);
return matrix;
}
