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d33ed4f9ab
Add a new curve type for elliptical arcs and use it for rounded rectangles and circles. We use the 'E' command to represent elliptical arcs in serialized paths.
173 lines
8.1 KiB
C
173 lines
8.1 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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#include "gskpathopprivate.h"
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#include "gskpath.h"
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#include "gskboundingboxprivate.h"
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G_BEGIN_DECLS
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typedef gpointer gskpathop;
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typedef union _GskCurve GskCurve;
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typedef struct _GskLineCurve GskLineCurve;
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typedef struct _GskQuadCurve GskQuadCurve;
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typedef struct _GskCubicCurve GskCubicCurve;
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typedef struct _GskArcCurve GskArcCurve;
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struct _GskLineCurve
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{
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GskPathOperation op;
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gboolean padding;
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graphene_point_t points[2];
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};
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struct _GskQuadCurve
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{
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GskPathOperation op;
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gboolean has_coefficients;
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graphene_point_t points[3];
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graphene_point_t coeffs[3];
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};
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struct _GskCubicCurve
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{
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GskPathOperation op;
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gboolean has_coefficients;
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graphene_point_t points[4];
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graphene_point_t coeffs[4];
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};
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struct _GskArcCurve
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{
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GskPathOperation op;
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gboolean has_matrix;
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graphene_point_t points[3];
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graphene_matrix_t m;
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};
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union _GskCurve
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{
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GskPathOperation op;
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GskLineCurve line;
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GskQuadCurve quad;
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GskCubicCurve cubic;
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GskArcCurve arc;
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};
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typedef enum {
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GSK_CURVE_LINE_REASON_STRAIGHT,
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GSK_CURVE_LINE_REASON_SHORT
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} GskCurveLineReason;
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typedef gboolean (* GskCurveAddLineFunc) (const graphene_point_t *from,
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const graphene_point_t *to,
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float from_progress,
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float to_progress,
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GskCurveLineReason reason,
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gpointer user_data);
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typedef gboolean (* GskCurveAddCurveFunc) (GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts,
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gpointer user_data);
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void gsk_curve_init (GskCurve *curve,
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gskpathop op);
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void gsk_curve_init_foreach (GskCurve *curve,
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GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts);
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void gsk_curve_print (const GskCurve *curve,
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GString *string);
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char * gsk_curve_to_string (const GskCurve *curve);
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gskpathop gsk_curve_pathop (const GskCurve *curve);
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const graphene_point_t *gsk_curve_get_start_point (const GskCurve *curve);
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const graphene_point_t *gsk_curve_get_end_point (const GskCurve *curve);
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void gsk_curve_get_start_tangent (const GskCurve *curve,
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graphene_vec2_t *tangent);
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void gsk_curve_get_end_tangent (const GskCurve *curve,
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graphene_vec2_t *tangent);
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void gsk_curve_get_point (const GskCurve *curve,
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float progress,
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graphene_point_t *pos);
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void gsk_curve_get_tangent (const GskCurve *curve,
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float progress,
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graphene_vec2_t *tangent);
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void gsk_curve_reverse (const GskCurve *curve,
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GskCurve *reverse);
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void gsk_curve_split (const GskCurve *curve,
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float progress,
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GskCurve *start,
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GskCurve *end);
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void gsk_curve_segment (const GskCurve *curve,
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float start,
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float end,
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GskCurve *segment);
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gboolean gsk_curve_decompose (const GskCurve *curve,
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float tolerance,
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GskCurveAddLineFunc add_line_func,
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gpointer user_data);
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gboolean gsk_curve_decompose_curve (const GskCurve *curve,
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GskPathForeachFlags flags,
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float tolerance,
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GskCurveAddCurveFunc add_curve_func,
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gpointer user_data);
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#define gsk_curve_builder_to(curve, builder) gsk_path_builder_pathop_to ((builder), gsk_curve_pathop (curve))
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float gsk_curve_get_curvature (const GskCurve *curve,
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float t,
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graphene_point_t *center);
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void gsk_curve_get_bounds (const GskCurve *curve,
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GskBoundingBox *bounds);
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void gsk_curve_get_tight_bounds (const GskCurve *curve,
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GskBoundingBox *bounds);
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void gsk_curve_get_derivative (const GskCurve *curve,
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GskCurve *derivative);
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int gsk_curve_get_crossing (const GskCurve *curve,
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const graphene_point_t *point);
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gboolean gsk_curve_get_closest_point (const GskCurve *curve,
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const graphene_point_t *point,
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float threshold,
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float *out_dist,
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float *out_t);
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G_END_DECLS
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