src/draw-anchor.cpp

   1 /** \file
   2  * Anchors implementation.
   3  */
   4
   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  */
  14
  15
  16 #include "draw-anchor.h"
  17 #include "desktop.h"
  18 #include "desktop-handles.h"
  19 #include "event-context.h"
  20 #include "lpe-tool-context.h"
  21 #include "display/sodipodi-ctrl.h"
  22 #include "display/curve.h"
  23
  24 /**
  25  * Creates an anchor object and initializes it.
  26  */
  27 SPDrawAnchor *
  28 sp_draw_anchor_new(SPDrawContext *dc, SPCurve *curve, gboolean start, Geom::Point delta)
  29 {
  30     if (SP_IS_LPETOOL_CONTEXT(dc)) {
  31         // suppress all kinds of anchors in LPEToolContext
  32         return NULL;
  33     }
  34
  35     SPDesktop *dt = SP_EVENT_CONTEXT_DESKTOP(dc);
  36
  37     SPDrawAnchor *a = g_new(SPDrawAnchor, 1);
  38
  39     a->dc = dc;
  40     a->curve = curve;
  41     curve->ref();
  42     a->start = start;
  43     a->active = FALSE;
  44     a->dp = delta;
  45     a->ctrl = sp_canvas_item_new(sp_desktop_controls(dt), SP_TYPE_CTRL,
  46                                  "size", 6.0,
  47                                  "filled", 0,
  48                                  "fill_color", 0xff00007f,
  49                                  "stroked", 1,
  50                                  "stroke_color", 0x000000ff,
  51                                  NULL);
  52
  53     SP_CTRL(a->ctrl)->moveto(delta);
  54
  55     return a;
  56 }
  57
  58 /**
  59  * Destroys the anchor's canvas item and frees the anchor object.
  60  */
  61 SPDrawAnchor *
  62 sp_draw_anchor_destroy(SPDrawAnchor *anchor)
  63 {
  64     if (anchor->curve) {
  65         anchor->curve->unref();
  66     }
  67     if (anchor->ctrl) {
  68         gtk_object_destroy(GTK_OBJECT(anchor->ctrl));
  69     }
  70     g_free(anchor);
  71     return NULL;
  72 }
  73
  74 #define A_SNAP 4.0
  75
  76 /**
  77  * Test if point is near anchor, if so fill anchor on canvas and return
  78  * pointer to it or NULL.
  79  */
  80 SPDrawAnchor *
  81 sp_draw_anchor_test(SPDrawAnchor *anchor, Geom::Point w, gboolean activate)
  82 {
  83     SPDesktop *dt = SP_EVENT_CONTEXT_DESKTOP(anchor->dc);
  84
  85     if ( activate && ( Geom::LInfty( w - dt->d2w(anchor->dp) ) <= A_SNAP ) ) {
  86         if (!anchor->active) {
  87             sp_canvas_item_set((GtkObject *) anchor->ctrl, "filled", TRUE, NULL);
  88             anchor->active = TRUE;
  89         }
  90         return anchor;
  91     }
  92
  93     if (anchor->active) {
  94         sp_canvas_item_set((GtkObject *) anchor->ctrl, "filled", FALSE, NULL);
  95         anchor->active = FALSE;
  96     }
  97     return NULL;
  98 }
  99
 100
 101 /*
 102   Local Variables:
 103   mode:c++
 104   c-file-style:"stroustrup"
 105   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 106   indent-tabs-mode:nil
 107   fill-column:99
 108   End:
 109 */
 110 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :