moving trunk for module inkscape

(bzr r1)

1 files changed, 192 insertions, 0 deletions

diff --git a/src/context-fns.cpp b/src/context-fns.cpp
new file mode 100644
index 000000000..42100d49a
--- /dev/null
+++ b/src/context-fns.cpp
@@ -0,0 +1,192 @@
+#include <glibmm/i18n.h>
+#include "sp-item.h"
+#include "desktop.h"
+#include "message-context.h"
+#include "message-stack.h"
+#include "context-fns.h"
+#include "snap.h"
+#include "desktop-affine.h"
+#include "event-context.h"
+
+/* FIXME: could probably use a template here */
+
+/**
+ *  Check to see if the current layer is both unhidden and unlocked.  If not,
+ *  set a message about it on the given context.
+ *
+ *  \param desktop Desktop.
+ *  \param message Message context to put messages on.
+ *  \return true if the current layer is both unhidden and unlocked, otherwise false.
+ */
+
+bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageContext *message)
+{
+    SPItem const *layer = SP_ITEM(desktop->currentLayer());
+    
+    if ( !layer || desktop->itemIsHidden(layer) ) {
+            message->flash(Inkscape::ERROR_MESSAGE,
+                         _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
+            return false;
+    }
+    
+    if ( !layer || layer->isLocked() ) {
+            message->flash(Inkscape::ERROR_MESSAGE,
+                         _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
+            return false;
+    }
+
+    return true;
+}
+
+
+/**
+ *  Check to see if the current layer is both unhidden and unlocked.  If not,
+ *  set a message about it on the given context.
+ *
+ *  \param desktop Desktop.
+ *  \param message Message context to put messages on.
+ *  \return true if the current layer is both unhidden and unlocked, otherwise false.
+ */
+
+bool Inkscape::have_viable_layer(SPDesktop *desktop, MessageStack *message)
+{
+    SPItem const *layer = SP_ITEM(desktop->currentLayer());
+    
+    if ( !layer || desktop->itemIsHidden(layer) ) {
+            message->flash(Inkscape::WARNING_MESSAGE,
+                         _("<b>Current layer is hidden</b>. Unhide it to be able to draw on it."));
+            return false;
+    }
+    
+    if ( !layer || layer->isLocked() ) {
+            message->flash(Inkscape::WARNING_MESSAGE,
+                         _("<b>Current layer is locked</b>. Unlock it to be able to draw on it."));
+            return false;
+    }
+
+    return true;
+}
+
+
+NR::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
+                                        NR::Point const &pt, NR::Point const &center, int state)
+{
+    NR::Point p[2];
+
+    bool const shift = state & GDK_SHIFT_MASK;
+    bool const control = state & GDK_CONTROL_MASK;
+
+    SnapManager const m(desktop->namedview);
+
+    if (control) {
+
+        /* Control is down: we are constrained to producing integer-ratio rectangles */
+
+        /* Vector from the centre of the box to the point we are dragging to */
+        NR::Point delta = pt - center;
+
+        /* Round it so that we have an integer-ratio box */
+        if (fabs(delta[NR::X]) > fabs(delta[NR::Y]) && (delta[NR::Y] != 0.0)) {
+            delta[NR::X] = floor(delta[NR::X] / delta[NR::Y] + 0.5) * delta[NR::Y];
+        } else if (delta[NR::X] != 0.0) {
+            delta[NR::Y] = floor(delta[NR::Y] / delta[NR::X] + 0.5) * delta[NR::X];
+        }
+
+        /* p[1] is the dragged point with the integer-ratio constraint */
+        p[1] = center + delta;
+        
+        if (shift) {
+
+            /* Shift is down, so our origin is the centre point rather than the corner
+            ** point; this means that corner-point movements are bound to each other.
+            */
+
+            /* p[0] is the opposite corner of our box */
+            p[0] = center - delta;
+            
+            Inkscape::SnappedPoint s[2];
+
+            /* Try to snap p[0] (the opposite corner) along the constraint vector */
+            s[0] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT,
+                                     p[0], p[0] - p[1], item);
+
+            /* Try to snap p[1] (the dragged corner) along the constraint vector */
+            s[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT,
+                                     p[1], p[1] - p[0], item);
+
+            /* Choose the best snap and update points accordingly */
+            if (s[0].getDistance() < s[1].getDistance()) {
+                p[0] = s[0].getPoint();
+                p[1] = 2 * center - s[0].getPoint();
+            } else {
+                p[0] = 2 * center - s[1].getPoint();
+                p[1] = s[1].getPoint();
+            }
+            
+        } else {
+
+            /* Our origin is the opposite corner.  Snap the drag point along the constraint vector */
+            p[0] = center;
+            p[1] = m.constrainedSnap(Inkscape::Snapper::SNAP_POINT, p[1], p[1] - p[0], item).getPoint();
+        }
+        
+    } else if (shift) {
+
+        /* Shift is down, so our origin is the centre point rather than the corner point;
+        ** this means that corner-point movements are bound to each other.
+        */
+        
+        p[1] = pt;
+        p[0] = 2 * center - p[1];
+
+        Inkscape::SnappedPoint s[2];
+
+        s[0] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[0], item);
+        s[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p[1], item);
+
+        if (s[0].getDistance() < s[1].getDistance()) {
+            p[0] = s[0].getPoint();
+            p[1] = 2 * center - s[0].getPoint();
+        } else {
+            p[0] = 2 * center - s[1].getPoint();
+            p[1] = s[1].getPoint();
+        }
+        
+    } else {
+        
+        /* There's no constraint on the corner point, so just snap it to anything */
+        p[0] = center;
+        p[1] = m.freeSnap(Inkscape::Snapper::SNAP_POINT, pt, item).getPoint();
+    }
+
+    p[0] = sp_desktop_dt2root_xy_point(desktop, p[0]);
+    p[1] = sp_desktop_dt2root_xy_point(desktop, p[1]);
+
+    return NR::Rect(NR::Point(MIN(p[0][NR::X], p[1][NR::X]), MIN(p[0][NR::Y], p[1][NR::Y])),
+                    NR::Point(MAX(p[0][NR::X], p[1][NR::X]), MAX(p[0][NR::Y], p[1][NR::Y])));
+}
+
+
+
+NR::Point Inkscape::setup_for_drag_start(SPDesktop *desktop, SPEventContext* ec, GdkEvent *ev)
+{
+    ec->xp = static_cast<gint>(ev->button.x);
+    ec->yp = static_cast<gint>(ev->button.y);
+    ec->within_tolerance = true;
+
+    NR::Point const p(ev->button.x, ev->button.y);
+    ec->item_to_select = sp_event_context_find_item(desktop, p, ev->button.state & GDK_MOD1_MASK, TRUE);
+    return ec->desktop->w2d(p);
+}
+
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :