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(draw_gravity_vector) saving/restoring cairo context, for isolation.

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This commit is contained in:
Antonio Carzaniga 2021-12-03 15:58:36 +01:00
parent 896470f7bf
commit b3bb1666fa
1 changed files with 2 additions and 0 deletions
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2
balls.c
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@ -214,6 +214,7 @@ int gravity_vector_init = 300;
void draw_gravity_vector(cairo_t * cr) { void draw_gravity_vector(cairo_t * cr) {
if (gravity_vector_countdown != 0) { if (gravity_vector_countdown != 0) {
cairo_save(cr);
cairo_new_path(cr); cairo_new_path(cr);
cairo_move_to(cr, width/2, height/2); cairo_move_to(cr, width/2, height/2);
cairo_line_to(cr, width/2 + g_x, height/2 + g_y); cairo_line_to(cr, width/2 + g_x, height/2 + g_y);
@ -224,6 +225,7 @@ void draw_gravity_vector(cairo_t * cr) {
cairo_fill(cr); cairo_fill(cr);
if (gravity_vector_countdown > 0) if (gravity_vector_countdown > 0)
--gravity_vector_countdown; --gravity_vector_countdown;
cairo_restore(cr);
} }
} }