1 /** \file
2 * Anchors implementation.
3 */
5 /*
6 * Authors:
7 * Copyright (C) 2000 Lauris Kaplinski
8 * Copyright (C) 2000-2001 Ximian, Inc.
9 * Copyright (C) 2002 Lauris Kaplinski
10 * Copyright (C) 2004 Monash University
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
16 #include "draw-anchor.h"
17 #include "desktop.h"
18 #include "desktop-handles.h"
19 #include "event-context.h"
20 #include "display/sodipodi-ctrl.h"
21 #include "display/curve.h"
23 /**
24 * Creates an anchor object and initializes it.
25 */
26 SPDrawAnchor *
27 sp_draw_anchor_new(SPDrawContext *dc, SPCurve *curve, gboolean start, NR::Point delta)
28 {
29 SPDesktop *dt = SP_EVENT_CONTEXT_DESKTOP(dc);
31 SPDrawAnchor *a = g_new(SPDrawAnchor, 1);
33 a->dc = dc;
34 a->curve = curve;
35 curve->ref();
36 a->start = start;
37 a->active = FALSE;
38 a->dp = delta;
39 a->ctrl = sp_canvas_item_new(sp_desktop_controls(dt), SP_TYPE_CTRL,
40 "size", 6.0,
41 "filled", 0,
42 "fill_color", 0xff00007f,
43 "stroked", 1,
44 "stroke_color", 0x000000ff,
45 NULL);
47 SP_CTRL(a->ctrl)->moveto(delta);
49 return a;
50 }
52 /**
53 * Destroys the anchor's canvas item and frees the anchor object.
54 */
55 SPDrawAnchor *
56 sp_draw_anchor_destroy(SPDrawAnchor *anchor)
57 {
58 if (anchor->curve) {
59 anchor->curve->unref();
60 }
61 if (anchor->ctrl) {
62 gtk_object_destroy(GTK_OBJECT(anchor->ctrl));
63 }
64 g_free(anchor);
65 return NULL;
66 }
68 #define A_SNAP 4.0
70 /**
71 * Test if point is near anchor, if so fill anchor on canvas and return
72 * pointer to it or NULL.
73 */
74 SPDrawAnchor *
75 sp_draw_anchor_test(SPDrawAnchor *anchor, NR::Point w, gboolean activate)
76 {
77 SPDesktop *dt = SP_EVENT_CONTEXT_DESKTOP(anchor->dc);
79 if ( activate && ( NR::LInfty( w - dt->d2w(anchor->dp) ) <= A_SNAP ) ) {
80 if (!anchor->active) {
81 sp_canvas_item_set((GtkObject *) anchor->ctrl, "filled", TRUE, NULL);
82 anchor->active = TRUE;
83 }
84 return anchor;
85 }
87 if (anchor->active) {
88 sp_canvas_item_set((GtkObject *) anchor->ctrl, "filled", FALSE, NULL);
89 anchor->active = FALSE;
90 }
91 return NULL;
92 }
95 /*
96 Local Variables:
97 mode:c++
98 c-file-style:"stroustrup"
99 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
100 indent-tabs-mode:nil
101 fill-column:99
102 End:
103 */
104 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :