/* 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 <math.h> #include <string.h> #include <glib.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; }