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"
11 /* FIXME: could probably use a template here */
13 /**
14 * Check to see if the current layer is both unhidden and unlocked. If not,
15 * set a message about it on the given context.
16 *
17 * \param desktop Desktop.
18 * \param message Message context to put messages on.
19 * \return true if the current layer is both unhidden and unlocked, otherwise false.
20 */
22 bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
23 {
24 SPItem const *layer = SP_ITEM(desktop->currentLayer());
26 if ( !layer || desktop->itemIsHidden(layer) ) {
27 message->flash(Inkscape::ERROR_MESSAGE,
28 _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
29 return false;
30 }
32 if ( !layer || layer->isLocked() ) {
33 message->flash(Inkscape::ERROR_MESSAGE,
34 _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
35 return false;
36 }
38 return true;
39 }
42 /**
43 * Check to see if the current layer is both unhidden and unlocked. If not,
44 * set a message about it on the given context.
45 *
46 * \param desktop Desktop.
47 * \param message Message context to put messages on.
48 * \return true if the current layer is both unhidden and unlocked, otherwise false.
49 */
51 bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
52 {
53 SPItem const *layer = SP_ITEM(desktop->currentLayer());
55 if ( !layer || desktop->itemIsHidden(layer) ) {
56 message->flash(Inkscape::WARNING_MESSAGE,
57 _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
58 return false;
59 }
61 if ( !layer || layer->isLocked() ) {
62 message->flash(Inkscape::WARNING_MESSAGE,
63 _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
64 return false;
65 }
67 return true;
68 }
71 NR::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
72 NR::Point const &pt, NR::Point const ¢er, int state)
73 {
74 NR::Point p[2];
76 bool const shift = state & GDK_SHIFT_MASK;
77 bool const control = state & GDK_CONTROL_MASK;
79 SnapManager const m(desktop->namedview);
81 if (control) {
83 /* Control is down: we are constrained to producing integer-ratio rectangles */
85 /* Vector from the centre of the box to the point we are dragging to */
86 NR::Point delta = pt - center;
88 /* Round it so that we have an integer-ratio box */
89 if (fabs(delta[NR::X]) > fabs(delta[NR::Y]) && (delta[NR::Y] != 0.0)) {
90 delta[NR::X] = floor(delta[NR::X] / delta[NR::Y] + 0.5) * delta[NR::Y];
91 } else if (delta[NR::X] != 0.0) {
92 delta[NR::Y] = floor(delta[NR::Y] / delta[NR::X] + 0.5) * delta[NR::X];
93 }
95 /* p[1] is the dragged point with the integer-ratio constraint */
96 p[1] = center + delta;
98 if (shift) {
100 /* Shift is down, so our origin is the centre point rather than the corner
101 ** point; this means that corner-point movements are bound to each other.
102 */
104 /* p[0] is the opposite corner of our box */
105 p[0] = center - delta;
107 Inkscape::SnappedPoint s[2];
109 /* Try to snap p[0] (the opposite corner) along the constraint vector */
110 s[0] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT,
111 p[0], p[0] - p[1], item);
113 /* Try to snap p[1] (the dragged corner) along the constraint vector */
114 s[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT,
115 p[1], p[1] - p[0], item);
117 /* Choose the best snap and update points accordingly */
118 if (s[0].getDistance() < s[1].getDistance()) {
119 p[0] = s[0].getPoint();
120 p[1] = 2 * center - s[0].getPoint();
121 } else {
122 p[0] = 2 * center - s[1].getPoint();
123 p[1] = s[1].getPoint();
124 }
126 } else {
128 /* Our origin is the opposite corner. Snap the drag point along the constraint vector */
129 p[0] = center;
130 p[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[1], p[1] - p[0], item).getPoint();
131 }
133 } else if (shift) {
135 /* Shift is down, so our origin is the centre point rather than the corner point;
136 ** this means that corner-point movements are bound to each other.
137 */
139 p[1] = pt;
140 p[0] = 2 * center - p[1];
142 Inkscape::SnappedPoint s[2];
144 s[0] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[0], item);
145 s[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[1], item);
147 if (s[0].getDistance() < s[1].getDistance()) {
148 p[0] = s[0].getPoint();
149 p[1] = 2 * center - s[0].getPoint();
150 } else {
151 p[0] = 2 * center - s[1].getPoint();
152 p[1] = s[1].getPoint();
153 }
155 } else {
157 /* There's no constraint on the corner point, so just snap it to anything */
158 p[0] = center;
159 p[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, pt, item).getPoint();
160 }
162 p[0] = sp_desktop_dt2root_xy_point(desktop, p[0]);
163 p[1] = sp_desktop_dt2root_xy_point(desktop, p[1]);
165 return NR::Rect(NR::Point(MIN(p[0][NR::X], p[1][NR::X]), MIN(p[0][NR::Y], p[1][NR::Y])),
166 NR::Point(MAX(p[0][NR::X], p[1][NR::X]), MAX(p[0][NR::Y], p[1][NR::Y])));
167 }
171 NR::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, SPEventContext* ec, GdkEvent *ev)
172 {
173 ec->xp = static_cast<gint>(ev->button.x);
174 ec->yp = static_cast<gint>(ev->button.y);
175 ec->within_tolerance = true;
177 NR::Point const p(ev->button.x, ev->button.y);
178 ec->item_to_select = sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE);
179 return ec->desktop->w2d(p);
180 }
183 /*
184 Local Variables:
185 mode:c++
186 c-file-style:"stroustrup"
187 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
188 indent-tabs-mode:nil
189 fill-column:99
190 End:
191 */
192 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :