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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
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@ -89,6 +89,26 @@ gimp_display_shell_constrain_line (GimpDisplayShell *shell,
xres, yres); 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: * gimp_display_shell_get_line_status:
* @status: initial status text. * @status: initial status text.

38
app/display/gimpdisplayshell-utils.h
View File

@ -19,23 +19,27 @@
#define __GIMP_DISPLAY_SHELL_UTILS_H__ #define __GIMP_DISPLAY_SHELL_UTILS_H__
void gimp_display_shell_get_constrained_line_params (GimpDisplayShell *shell, void gimp_display_shell_get_constrained_line_params (GimpDisplayShell *shell,
gdouble *offset_angle, gdouble *offset_angle,
gdouble *xres, gdouble *xres,
gdouble *yres); gdouble *yres);
void gimp_display_shell_constrain_line (GimpDisplayShell *shell, void gimp_display_shell_constrain_line (GimpDisplayShell *shell,
gdouble start_x, gdouble start_x,
gdouble start_y, gdouble start_y,
gdouble *end_x, gdouble *end_x,
gdouble *end_y, gdouble *end_y,
gint n_snap_lines); gint n_snap_lines);
gchar * gimp_display_shell_get_line_status (GimpDisplayShell *shell, gdouble gimp_display_shell_constrain_angle (GimpDisplayShell *shell,
const gchar *status, gdouble angle,
const gchar *separator, gint n_snap_lines);
gdouble x1,
gdouble y1, gchar * gimp_display_shell_get_line_status (GimpDisplayShell *shell,
gdouble x2, const gchar *status,
gdouble y2); const gchar *separator,
gdouble x1,
gdouble y1,
gdouble x2,
gdouble y2);
#endif /* __GIMP_DISPLAY_SHELL_UTILS_H__ */ #endif /* __GIMP_DISPLAY_SHELL_UTILS_H__ */