diff options
Diffstat (limited to 'src/svg/gnome-canvas-bpath-util.cpp')
| -rw-r--r-- | src/svg/gnome-canvas-bpath-util.cpp | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/svg/gnome-canvas-bpath-util.cpp b/src/svg/gnome-canvas-bpath-util.cpp new file mode 100644 index 000000000..b583e1a66 --- /dev/null +++ b/src/svg/gnome-canvas-bpath-util.cpp @@ -0,0 +1,179 @@ +/* GnomeCanvas Bezier polyline paths & segments + * + * GnomeCanvas is basically a port of the Tk toolkit's most excellent canvas widget. Tk is + * copyrighted by the Regents of the University of California, Sun Microsystems, and other parties. + * + * Copyright (C) 1998,1999 The Free Software Foundation + * + * Authors: Federico Mena <federico@nuclecu.unam.mx> + * Lauris Kaplinski <lauris@ariman.ee> + * Raph Levien <raph@acm.org> + */ + +#include <glib/gmem.h> +#include <glib/gmessages.h> + +#include "libnr/n-art-bpath.h" +#include "gnome-canvas-bpath-util.h" + +GnomeCanvasBpathDef * +gnome_canvas_bpath_def_new (void) +{ + GnomeCanvasBpathDef *bpd; + + bpd = g_new (GnomeCanvasBpathDef, 1); + bpd->n_bpath = 0; + bpd->n_bpath_max = 16; + bpd->moveto_idx = -1; + bpd->bpath = g_new (NArtBpath, bpd->n_bpath_max); + bpd->ref_count = 1; + + return bpd; +} + +GnomeCanvasBpathDef * +gnome_canvas_bpath_def_new_from (NArtBpath *path) +{ + GnomeCanvasBpathDef *bpd; + int i; + + g_return_val_if_fail (path != NULL, NULL); + + bpd = g_new (GnomeCanvasBpathDef, 1); + + for (i = 0; path [i].code != NR_END; i++) + ; + bpd->n_bpath = i; + bpd->n_bpath_max = i; + bpd->moveto_idx = -1; + bpd->ref_count = 1; + bpd->bpath = g_new (NArtBpath, i); + + memcpy (bpd->bpath, path, i * sizeof (NArtBpath)); + return bpd; +} + +GnomeCanvasBpathDef * +gnome_canvas_bpath_def_ref (GnomeCanvasBpathDef *bpd) +{ + g_return_val_if_fail (bpd != NULL, NULL); + + bpd->ref_count += 1; + return bpd; +} + +void +gnome_canvas_bpath_def_free (GnomeCanvasBpathDef *bpd) +{ + g_return_if_fail (bpd != NULL); + + bpd->ref_count -= 1; + if (bpd->ref_count == 0) { + g_free (bpd->bpath); + g_free (bpd); + } +} + +void +gnome_canvas_bpath_def_moveto (GnomeCanvasBpathDef *bpd, double x, double y) +{ + NArtBpath *bpath; + int n_bpath; + + g_return_if_fail (bpd != NULL); + + n_bpath = bpd->n_bpath++; + + if (n_bpath == bpd->n_bpath_max) + bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath, + (bpd->n_bpath_max <<= 1) * sizeof (NArtBpath)); + bpath = bpd->bpath; + bpath[n_bpath].code = NR_MOVETO_OPEN; + bpath[n_bpath].x3 = x; + bpath[n_bpath].y3 = y; + bpd->moveto_idx = n_bpath; +} + +void +gnome_canvas_bpath_def_lineto (GnomeCanvasBpathDef *bpd, double x, double y) +{ + NArtBpath *bpath; + int n_bpath; + + g_return_if_fail (bpd != NULL); + g_return_if_fail (bpd->moveto_idx >= 0); + + n_bpath = bpd->n_bpath++; + + if (n_bpath == bpd->n_bpath_max) + bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath, + (bpd->n_bpath_max <<= 1) * sizeof (NArtBpath)); + bpath = bpd->bpath; + bpath[n_bpath].code = NR_LINETO; + bpath[n_bpath].x3 = x; + bpath[n_bpath].y3 = y; +} + +void +gnome_canvas_bpath_def_curveto (GnomeCanvasBpathDef *bpd, double x1, double y1, double x2, double y2, double x3, double y3) +{ + NArtBpath *bpath; + int n_bpath; + + g_return_if_fail (bpd != NULL); + g_return_if_fail (bpd->moveto_idx >= 0); + + n_bpath = bpd->n_bpath++; + + if (n_bpath == bpd->n_bpath_max) + bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath, + (bpd->n_bpath_max <<= 1) * sizeof (NArtBpath)); + bpath = bpd->bpath; + bpath[n_bpath].code = NR_CURVETO; + bpath[n_bpath].x1 = x1; + bpath[n_bpath].y1 = y1; + bpath[n_bpath].x2 = x2; + bpath[n_bpath].y2 = y2; + bpath[n_bpath].x3 = x3; + bpath[n_bpath].y3 = y3; +} + +void +gnome_canvas_bpath_def_closepath (GnomeCanvasBpathDef *bpd) +{ + NArtBpath *bpath; + int n_bpath; + + g_return_if_fail (bpd != NULL); + g_return_if_fail (bpd->moveto_idx >= 0); + g_return_if_fail (bpd->n_bpath > 0); + + bpath = bpd->bpath; + n_bpath = bpd->n_bpath; + + /* Add closing vector if we need it. */ + if (bpath[n_bpath - 1].x3 != bpath[bpd->moveto_idx].x3 || + bpath[n_bpath - 1].y3 != bpath[bpd->moveto_idx].y3) { + gnome_canvas_bpath_def_lineto (bpd, bpath[bpd->moveto_idx].x3, + bpath[bpd->moveto_idx].y3); + bpath = bpd->bpath; + } + bpath[bpd->moveto_idx].code = NR_MOVETO; + bpd->moveto_idx = -1; +} + +void +gnome_canvas_bpath_def_art_finish (GnomeCanvasBpathDef *bpd) +{ + int n_bpath; + + g_return_if_fail (bpd != NULL); + + n_bpath = bpd->n_bpath++; + + if (n_bpath == bpd->n_bpath_max) + bpd->bpath = (NArtBpath*)g_realloc (bpd->bpath, + (bpd->n_bpath_max <<= 1) * sizeof (NArtBpath)); + bpd->bpath [n_bpath].code = NR_END; +} + |