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 "display/sodipodi-ctrl.h"
  21 #include "display/curve.h"
  22
  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);
  30
  31     SPDrawAnchor *a = g_new(SPDrawAnchor, 1);
  32
  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);
  46
  47     SP_CTRL(a->ctrl)->moveto(delta);
  48
  49     return a;
  50 }
  51
  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 }
  67
  68 #define A_SNAP 4.0
  69
  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);
  78
  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     }
  86
  87     if (anchor->active) {
  88         sp_canvas_item_set((GtkObject *) anchor->ctrl, "filled", FALSE, NULL);
  89         anchor->active = FALSE;
  90     }
  91     return NULL;
  92 }
  93
  94
  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 :