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app: add gimp_display_shell_constrain_angle() 

... which constrains an angle to discrete increments in screen
space, similarly to gimp_display_shell_constrain_line().
This commit is contained in:
Ell 2020-05-14 23:44:50 +03:00
parent 06a2b4f338
commit 8c1a277007
2 changed files with 41 additions and 17 deletions
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20
app/display/gimpdisplayshell-utils.c
View File

@ -89,6 +89,26 @@ gimp_display_shell_constrain_line (GimpDisplayShell *shell,
xres, yres);
}
gdouble
gimp_display_shell_constrain_angle (GimpDisplayShell *shell,
gdouble angle,
gint n_snap_lines)
{
gdouble x, y;
g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), 0.0);
x = cos (angle);
y = sin (angle);
gimp_display_shell_constrain_line (shell,
0.0, 0.0,
&x, &y,
n_snap_lines);
return atan2 (y, x);
}
/**
* gimp_display_shell_get_line_status:
* @status: initial status text.

4
app/display/gimpdisplayshell-utils.h
View File

@ -29,6 +29,10 @@ void gimp_display_shell_constrain_line (GimpDisplayShell *shell,
gdouble *end_x,
gdouble *end_y,
gint n_snap_lines);
gdouble gimp_display_shell_constrain_angle (GimpDisplayShell *shell,
gdouble angle,
gint n_snap_lines);
gchar * gimp_display_shell_get_line_status (GimpDisplayShell *shell,
const gchar *status,
const gchar *separator,