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libui/GTK: fix drawmatrix transform order to match Windows. fixes rotation.

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This commit is contained in:
StapleButter
2017-12-05 04:12:03 +01:00
parent c5872dab7d
commit dd529f0f5c
2 changed files with 16 additions and 10 deletions
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20
src/libui_sdl/libui/unix/drawmatrix.c
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@ -25,35 +25,41 @@ static void c2m(cairo_matrix_t *c, uiDrawMatrix *m)
void uiDrawMatrixTranslate(uiDrawMatrix *m, double x, double y)
{
cairo_matrix_t c;
cairo_matrix_t tmp;
m2c(m, &c);
cairo_matrix_translate(&c, x, y);
cairo_matrix_init_translate(&tmp, x, y);
cairo_matrix_multiply(&c, &c, &tmp);
c2m(&c, m);
}
void uiDrawMatrixScale(uiDrawMatrix *m, double xCenter, double yCenter, double x, double y)
{
cairo_matrix_t c;
cairo_matrix_t tmp;
double xt, yt;
m2c(m, &c);
xt = x;
yt = y;
scaleCenter(xCenter, yCenter, &xt, &yt);
cairo_matrix_translate(&c, xt, yt);
cairo_matrix_scale(&c, x, y);
cairo_matrix_translate(&c, -xt, -yt);
cairo_matrix_init_translate(&tmp, xt, yt);
cairo_matrix_scale(&tmp, x, y);
cairo_matrix_translate(&tmp, -xt, -yt);
cairo_matrix_multiply(&c, &c, &tmp);
c2m(&c, m);
}
void uiDrawMatrixRotate(uiDrawMatrix *m, double x, double y, double amount)
{
cairo_matrix_t c;
cairo_matrix_t tmp;
m2c(m, &c);
cairo_matrix_translate(&c, x, y);
cairo_matrix_rotate(&c, amount);
cairo_matrix_translate(&c, -x, -y);
cairo_matrix_init_translate(&tmp, x, y);
cairo_matrix_rotate(&tmp, amount);
cairo_matrix_translate(&tmp, -x, -y);
cairo_matrix_multiply(&c, &c, &tmp);
c2m(&c, m);
}