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25e6231a88
Arcs were appealing, but they have a fatal flaw: we can't split our arcs without changing the ellipse they trace. That could be fixed by adding an extra parameter, but then it is no longer any better than conics. So switch back to conics, which have the advantage that they are used elsewhere.
149 lines
6.4 KiB
C
149 lines
6.4 KiB
C
/*
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* Copyright © 2020 Benjamin Otte
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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* Authors: Benjamin Otte <otte@gnome.org>
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*/
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#pragma once
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#if !defined (__GSK_H_INSIDE__) && !defined (GTK_COMPILATION)
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#error "Only <gsk/gsk.h> can be included directly."
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#endif
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#include <gsk/gsktypes.h>
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G_BEGIN_DECLS
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/**
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* GskPathForeachFlags:
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* @GSK_PATH_FOREACH_ALLOW_ONLY_LINES: The default behavior, only allow lines.
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* @GSK_PATH_FOREACH_ALLOW_QUAD: Allow emission of `GSK_PATH_QUAD` operations
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* @GSK_PATH_FOREACH_ALLOW_CUBIC: Allow emission of `GSK_PATH_CUBIC` operations.
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* @GSK_PATH_FOREACH_ALLOW_CONIC: Allow emission of `GSK_PATH_CONIC` operations.
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*
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* Flags that can be passed to gsk_path_foreach() to influence what
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* kinds of operations the path is decomposed into.
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*
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* By default, [method@Gsk.Path.foreach] will only emit a path with all
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* operations flattened to straight lines to allow for maximum compatibility.
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* The only operations emitted will be `GSK_PATH_MOVE`, `GSK_PATH_LINE` and
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* `GSK_PATH_CLOSE`.
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*
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* Since: 4.14
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*/
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typedef enum
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{
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GSK_PATH_FOREACH_ALLOW_ONLY_LINES = 0,
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GSK_PATH_FOREACH_ALLOW_QUAD = (1 << 0),
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GSK_PATH_FOREACH_ALLOW_CUBIC = (1 << 1),
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GSK_PATH_FOREACH_ALLOW_CONIC = (1 << 2),
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} GskPathForeachFlags;
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/**
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* GskPathForeachFunc:
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* @op: The operation
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* @pts: The points of the operation
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* @n_pts: The number of points
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* @weight: The weight for conic curves, or unused if not a conic curve
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* @user_data: The user data provided with the function
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*
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* Prototype of the callback to iterate through the operations of
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* a path.
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*
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* For each operation, the callback is given the @op itself, the points
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* that the operation is applied to in @pts, and a @weight for conic
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* curves. The @n_pts argument is somewhat redundant, since the number
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* of points can be inferred from the operation.
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*
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* Each contour of the path starts with a @GSK_PATH_MOVE operation.
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* Closed contours end with a @GSK_PATH_CLOSE operation.
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*
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* Returns: %TRUE to continue iterating the path, %FALSE to
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* immediately abort and not call the function again.
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*/
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typedef gboolean (* GskPathForeachFunc) (GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts,
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float weight,
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gpointer user_data);
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#define GSK_TYPE_PATH (gsk_path_get_type ())
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GDK_AVAILABLE_IN_4_14
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GType gsk_path_get_type (void) G_GNUC_CONST;
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GDK_AVAILABLE_IN_4_14
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GskPath * gsk_path_ref (GskPath *self);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_unref (GskPath *self);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_print (GskPath *self,
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GString *string);
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GDK_AVAILABLE_IN_4_14
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char * gsk_path_to_string (GskPath *self);
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GDK_AVAILABLE_IN_4_14
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GskPath * gsk_path_parse (const char *string);
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GDK_AVAILABLE_IN_4_14
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void gsk_path_to_cairo (GskPath *self,
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cairo_t *cr);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_is_empty (GskPath *self);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_is_closed (GskPath *self);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_get_bounds (GskPath *self,
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graphene_rect_t *bounds);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_get_stroke_bounds (GskPath *self,
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const GskStroke *stroke,
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graphene_rect_t *bounds);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_in_fill (GskPath *self,
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const graphene_point_t *point,
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GskFillRule fill_rule);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_get_start_point (GskPath *self,
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GskPathPoint *result);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_get_end_point (GskPath *self,
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GskPathPoint *result);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_get_closest_point (GskPath *self,
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const graphene_point_t *point,
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float threshold,
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GskPathPoint *result);
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GDK_AVAILABLE_IN_4_14
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gboolean gsk_path_foreach (GskPath *self,
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GskPathForeachFlags flags,
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GskPathForeachFunc func,
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gpointer user_data);
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G_DEFINE_AUTOPTR_CLEANUP_FUNC(GskPath, gsk_path_unref)
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G_END_DECLS
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