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graphics: support shear operation on transformation matrices

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This commit is contained in:
K. Lange 2023-03-30 14:52:26 +09:00
parent f9ef88ffc0
commit d7c64d7e56
3 changed files with 16 additions and 0 deletions
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1
base/usr/include/toaru/graphics.h
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@ -133,6 +133,7 @@ extern void gfx_matrix_identity(gfx_matrix_t);
extern void gfx_matrix_scale(gfx_matrix_t, double x, double y);
extern void gfx_matrix_translate(gfx_matrix_t, double x, double y);
extern void gfx_matrix_rotate(gfx_matrix_t, double rotation);
extern void gfx_matrix_shear(gfx_matrix_t matrix, double x, double y);
extern void gfx_apply_matrix(double x, double y, gfx_matrix_t matrix, double *out_x, double *out_y);

7
lib/graphics.c
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@ -896,6 +896,13 @@ void gfx_matrix_scale(gfx_matrix_t matrix, double x, double y) {
});
}
void gfx_matrix_shear(gfx_matrix_t matrix, double x, double y) {
multiply_matrix(matrix, (gfx_matrix_t){
{1.0, x, 0.0},
{y, 1.0, 0.0},
});
}
void gfx_matrix_rotate(gfx_matrix_t matrix, double r) {
multiply_matrix(matrix, (gfx_matrix_t){
{ cos(r), -sin(r), 0.0},

8
lib/kuroko/_yutani2.c
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@ -903,6 +903,13 @@ KRK_Method(TransformMatrix,rotate) {
return NONE_VAL();
}
KRK_Method(TransformMatrix,shear) {
double x, y;
if (!krk_parseArgs(".dd", (const char*[]){"x","y"}, &x, &y)) return NONE_VAL();
gfx_matrix_shear(self->matrix,x,y);
return NONE_VAL();
}
KRK_Method(TransformMatrix,apply) {
double x, y;
if (!krk_parseArgs(".dd", (const char*[]){"x","y"}, &x, &y)) return NONE_VAL();
@ -2113,6 +2120,7 @@ KrkValue krk_module_onload__yutani2(void) {
BIND_METHOD(TransformMatrix,scale);
BIND_METHOD(TransformMatrix,translate);
BIND_METHOD(TransformMatrix,rotate);
BIND_METHOD(TransformMatrix,shear);
BIND_METHOD(TransformMatrix,apply);
krk_finalizeClass(TransformMatrix);