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