1 #include <glibmm/i18n.h>
2 #include "sp-item.h"
3 #include "desktop.h"
4 #include "message-context.h"
5 #include "message-stack.h"
6 #include "context-fns.h"
7 #include "snap.h"
8 #include "desktop-affine.h"
9 #include "event-context.h"
10 #include "sp-namedview.h"
12 /* FIXME: could probably use a template here */
14 /**
15 * Check to see if the current layer is both unhidden and unlocked. If not,
16 * set a message about it on the given context.
17 *
18 * \param desktop Desktop.
19 * \param message Message context to put messages on.
20 * \return true if the current layer is both unhidden and unlocked, otherwise false.
21 */
23 bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
24 {
25 SPItem const *layer = SP_ITEM(desktop->currentLayer());
27 if ( !layer || desktop->itemIsHidden(layer) ) {
28 message->flash(Inkscape::ERROR_MESSAGE,
29 _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
30 return false;
31 }
33 if ( !layer || layer->isLocked() ) {
34 message->flash(Inkscape::ERROR_MESSAGE,
35 _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
36 return false;
37 }
39 return true;
40 }
43 /**
44 * Check to see if the current layer is both unhidden and unlocked. If not,
45 * set a message about it on the given context.
46 *
47 * \param desktop Desktop.
48 * \param message Message context to put messages on.
49 * \return true if the current layer is both unhidden and unlocked, otherwise false.
50 */
52 bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
53 {
54 SPItem const *layer = SP_ITEM(desktop->currentLayer());
56 if ( !layer || desktop->itemIsHidden(layer) ) {
57 message->flash(Inkscape::WARNING_MESSAGE,
58 _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
59 return false;
60 }
62 if ( !layer || layer->isLocked() ) {
63 message->flash(Inkscape::WARNING_MESSAGE,
64 _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
65 return false;
66 }
68 return true;
69 }
72 NR::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
73 NR::Point const &pt, NR::Point const ¢er, int state)
74 {
75 NR::Point p[2];
77 bool const shift = state & GDK_SHIFT_MASK;
78 bool const control = state & GDK_CONTROL_MASK;
80 SnapManager const &m = desktop->namedview->snap_manager;
82 if (control) {
84 /* Control is down: we are constrained to producing integer-ratio rectangles */
86 /* Vector from the centre of the box to the point we are dragging to */
87 NR::Point delta = pt - center;
89 /* Round it so that we have an integer-ratio box */
90 if (fabs(delta[NR::X]) > fabs(delta[NR::Y]) && (delta[NR::Y] != 0.0)) {
91 delta[NR::X] = floor(delta[NR::X] / delta[NR::Y] + 0.5) * delta[NR::Y];
92 } else if (delta[NR::X] != 0.0) {
93 delta[NR::Y] = floor(delta[NR::Y] / delta[NR::X] + 0.5) * delta[NR::X];
94 }
96 /* p[1] is the dragged point with the integer-ratio constraint */
97 p[1] = center + delta;
99 if (shift) {
101 /* Shift is down, so our origin is the centre point rather than the corner
102 ** point; this means that corner-point movements are bound to each other.
103 */
105 /* p[0] is the opposite corner of our box */
106 p[0] = center - delta;
108 Inkscape::SnappedPoint s[2];
110 /* Try to snap p[0] (the opposite corner) along the constraint vector */
111 s[0] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[0],
112 Inkscape::Snapper::ConstraintLine(p[0] - p[1]), item);
114 /* Try to snap p[1] (the dragged corner) along the constraint vector */
115 s[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[1],
116 Inkscape::Snapper::ConstraintLine(p[1] - p[0]), item);
118 /* Choose the best snap and update points accordingly */
119 if (s[0].getDistance() < s[1].getDistance()) {
120 p[0] = s[0].getPoint();
121 p[1] = 2 * center - s[0].getPoint();
122 } else {
123 p[0] = 2 * center - s[1].getPoint();
124 p[1] = s[1].getPoint();
125 }
127 } else {
129 /* Our origin is the opposite corner. Snap the drag point along the constraint vector */
130 p[0] = center;
131 p[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[1],
132 Inkscape::Snapper::ConstraintLine(p[1] - p[0]), item).getPoint();
133 }
135 } else if (shift) {
137 /* Shift is down, so our origin is the centre point rather than the corner point;
138 ** this means that corner-point movements are bound to each other.
139 */
141 p[1] = pt;
142 p[0] = 2 * center - p[1];
144 Inkscape::SnappedPoint s[2];
146 s[0] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[0], item);
147 s[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[1], item);
149 if (s[0].getDistance() < s[1].getDistance()) {
150 p[0] = s[0].getPoint();
151 p[1] = 2 * center - s[0].getPoint();
152 } else {
153 p[0] = 2 * center - s[1].getPoint();
154 p[1] = s[1].getPoint();
155 }
157 } else {
159 /* There's no constraint on the corner point, so just snap it to anything */
160 p[0] = center;
161 p[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, pt, item).getPoint();
162 }
164 p[0] = sp_desktop_dt2root_xy_point(desktop, p[0]);
165 p[1] = sp_desktop_dt2root_xy_point(desktop, p[1]);
167 return NR::Rect(NR::Point(MIN(p[0][NR::X], p[1][NR::X]), MIN(p[0][NR::Y], p[1][NR::Y])),
168 NR::Point(MAX(p[0][NR::X], p[1][NR::X]), MAX(p[0][NR::Y], p[1][NR::Y])));
169 }
173 NR::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, SPEventContext* ec, GdkEvent *ev)
174 {
175 ec->xp = static_cast<gint>(ev->button.x);
176 ec->yp = static_cast<gint>(ev->button.y);
177 ec->within_tolerance = true;
179 NR::Point const p(ev->button.x, ev->button.y);
180 ec->item_to_select = sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE);
181 return ec->desktop->w2d(p);
182 }
185 /*
186 Local Variables:
187 mode:c++
188 c-file-style:"stroustrup"
189 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
190 indent-tabs-mode:nil
191 fill-column:99
192 End:
193 */
194 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :