Merge from trunk

(bzr r9508.1.89)

1 files changed, 382 insertions, 0 deletions

diff --git a/src/measure-context.cpp b/src/measure-context.cpp
new file mode 100644
index 000000000..8920facb9
--- /dev/null
+++ b/src/measure-context.cpp
@@ -0,0 +1,382 @@
+/*
+ * Our nice measuring tool
+ *
+ * Authors:
+ *   Felipe Correa da Silva Sanches <juca@members.fsf.org>
+ *
+ * Copyright (C) 2011 Authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+
+#include <gdk/gdkkeysyms.h>
+#include "helper/units.h"
+#include "macros.h"
+#include "display/curve.h"
+#include "sp-shape.h"
+#include "display/sp-ctrlline.h"
+#include "display/sodipodi-ctrl.h"
+#include "display/sp-canvas-item.h"
+#include "display/sp-canvas-util.h"
+#include "desktop.h"
+#include "document.h"
+#include "pixmaps/cursor-measure.xpm"
+#include "preferences.h"
+#include "inkscape.h"
+#include "desktop-handles.h"
+#include "measure-context.h"
+#include "draw-context.h"
+#include "display/canvas-text.h"
+#include "path-chemistry.h"
+#include "2geom/line.h"
+#include <2geom/path-intersection.h>
+#include <2geom/pathvector.h>
+#include <2geom/crossing.h>
+
+static void sp_measure_context_class_init(SPMeasureContextClass *klass);
+static void sp_measure_context_init(SPMeasureContext *measure_context);
+static void sp_measure_context_setup(SPEventContext *ec);
+static void sp_measure_context_finish (SPEventContext *ec);
+
+static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event);
+static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
+
+static SPEventContextClass *parent_class;
+
+static gint xp = 0, yp = 0; // where drag started
+static gint tolerance = 0;
+static bool within_tolerance = false;
+static SPCanvasItem * line = NULL;
+Geom::Point start_point;
+std::vector<Inkscape::Display::TemporaryItem*> measure_tmp_items;
+
+GType sp_measure_context_get_type(void)
+{
+    static GType type = 0;
+
+    if (!type) {
+        GTypeInfo info = {
+            sizeof(SPMeasureContextClass),
+            NULL, NULL,
+            (GClassInitFunc) sp_measure_context_class_init,
+            NULL, NULL,
+            sizeof(SPMeasureContext),
+            4,
+            (GInstanceInitFunc) sp_measure_context_init,
+            NULL,	/* value_table */
+        };
+        type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPMeasureContext", &info, (GTypeFlags) 0);
+    }
+
+    return type;
+}
+
+static void sp_measure_context_class_init(SPMeasureContextClass *klass)
+{
+    SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
+
+    parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
+
+    event_context_class->setup = sp_measure_context_setup;
+    event_context_class->finish = sp_measure_context_finish;
+
+    event_context_class->root_handler = sp_measure_context_root_handler;
+    event_context_class->item_handler = sp_measure_context_item_handler;
+}
+
+static void sp_measure_context_init (SPMeasureContext *measure_context)
+{
+    SPEventContext *event_context = SP_EVENT_CONTEXT(measure_context);
+
+    event_context->cursor_shape = cursor_measure_xpm;
+    event_context->hot_x = 4;
+    event_context->hot_y = 4;
+}
+
+static void
+sp_measure_context_finish (SPEventContext *ec)
+{
+	SPMeasureContext *mc = SP_MEASURE_CONTEXT(ec);
+	
+	ec->enableGrDrag(false);
+
+    if (mc->grabbed) {
+        sp_canvas_item_ungrab(mc->grabbed, GDK_CURRENT_TIME);
+        mc->grabbed = NULL;
+    }
+}
+
+static void sp_measure_context_setup(SPEventContext *ec)
+{
+    if (((SPEventContextClass *) parent_class)->setup) {
+        ((SPEventContextClass *) parent_class)->setup(ec);
+    }
+}
+
+static gint sp_measure_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
+{
+    gint ret = FALSE;
+
+    if (((SPEventContextClass *) parent_class)->item_handler) {
+        ret = ((SPEventContextClass *) parent_class)->item_handler (event_context, item, event);
+    }
+
+    return ret;
+}
+
+bool GeomPointSortPredicate(const Geom::Point& p1, const Geom::Point& p2)
+{
+  return p1[Geom::Y] < p2[Geom::Y];
+}
+
+static gint sp_measure_context_root_handler(SPEventContext *event_context, GdkEvent *event)
+{
+    SPDesktop *desktop = event_context->desktop;
+    Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+    tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
+	
+    SPMeasureContext *mc = SP_MEASURE_CONTEXT(event_context);
+    gint ret = FALSE;
+
+    switch (event->type) {
+        case GDK_BUTTON_PRESS:
+        {
+            Geom::Point const button_w(event->button.x, event->button.y);
+            start_point = desktop->w2d(button_w);
+            if (event->button.button == 1 && !event_context->space_panning) {
+                // save drag origin
+                xp = (gint) event->button.x;
+                yp = (gint) event->button.y;
+                within_tolerance = true;
+
+                ret = TRUE;
+            }
+
+            if (!line){
+                SPDesktop *desktop = inkscape_active_desktop();
+                line = sp_canvas_item_new(sp_desktop_controls(desktop), SP_TYPE_CTRLLINE, NULL);
+            }
+
+            sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point, start_point);
+            sp_canvas_item_show (line);
+
+            sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
+								GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_BUTTON_RELEASE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
+								NULL, event->button.time);
+            mc->grabbed = SP_CANVAS_ITEM(desktop->acetate);
+            break;
+        }
+
+	case GDK_MOTION_NOTIFY:
+        {
+            if (event->motion.state & GDK_BUTTON1_MASK && !event_context->space_panning) {
+                ret = TRUE;
+
+                if ( within_tolerance
+                     && ( abs( (gint) event->motion.x - xp ) < tolerance )
+                     && ( abs( (gint) event->motion.y - yp ) < tolerance ) ) {
+                    break; // do not drag if we're within tolerance from origin
+                }
+                // Once the user has moved farther than tolerance from the original location
+                // (indicating they intend to move the object, not click), then always process the
+                // motion notify coordinates as given (no snapping back to origin)
+                within_tolerance = false;
+
+                Geom::Point const motion_w(event->motion.x, event->motion.y);
+                Geom::Point const motion_dt(desktop->w2d(motion_w));
+                Geom::Point end_point = motion_dt;
+
+                if (event->motion.state & GDK_CONTROL_MASK)
+                    spdc_endpoint_snap_rotation(event_context, end_point, start_point, event->motion.state);
+
+                sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point[Geom::X], start_point[Geom::Y], end_point[Geom::X], end_point[Geom::Y]);
+
+                Geom::PathVector lineseg;
+                Geom::Path p;
+                p.start(desktop->dt2doc(start_point));
+                p.appendNew<Geom::LineSegment>(desktop->dt2doc(end_point));
+                lineseg.push_back(p);
+
+                double deltax = end_point[Geom::X] - start_point[Geom::X];
+                double deltay = end_point[Geom::Y] - start_point[Geom::Y];
+                double angle = atan2(deltay, deltax);
+
+//TODO: calculate NPOINTS
+//800 seems to be a good value for 800x600 resolution
+#define NPOINTS 800
+
+                std::vector<Geom::Point> points;
+                double i;
+                for (i=0; i<NPOINTS; i++){
+                    points.push_back(desktop->d2w(start_point + (i/NPOINTS)*(end_point-start_point)));
+                }
+
+                //select elements crossed by line segment:
+                GSList *items = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, points);
+                SPItem* item;
+                GSList *l;
+                int counter=0;
+                std::vector<Geom::Point> intersections;
+                Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+                bool ignore_1st_and_last = prefs->getBool("/tools/measure/ignore_1st_and_last", true);
+
+                if (!ignore_1st_and_last){
+                    intersections.push_back(desktop->dt2doc(start_point));
+                }
+
+                for (l = items; l != NULL; l = l->next){
+                    item = (SPItem*) (l->data);
+#if 0
+//TODO: deal with all kinds of objects:
+
+                    Inkscape::XML::Node *repr = sp_selected_item_to_curved_repr(item, 0);
+
+                    if (!repr) continue;
+                    item = (SPItem *) doc->getObjectByRepr(repr);
+                    if (!item) continue;
+                    SPCurve* curve = SP_SHAPE(item)->getCurve();
+#else
+                    SPCurve* curve = NULL;
+                    if (SP_IS_SHAPE(item)) {
+                        curve = SP_SHAPE(item)->getCurve();
+                    } 
+#endif
+                    if (!curve) continue;
+                    counter++;
+
+                    Geom::PathVector pathv = curve->get_pathvector();
+
+                    // Find all intersections of the control-line with this shape
+                    Geom::CrossingSet cs = Geom::crossings(lineseg, pathv);
+                    // Store the results as intersection points
+                    unsigned int index = 0;
+                    for (Geom::CrossingSet::const_iterator i = cs.begin(); i != cs.end(); i++) {
+                        if (index >= lineseg.size()) {
+                            break;
+                        }
+                        // Reconstruct and store the points of intersection
+                        for (Geom::Crossings::const_iterator m = (*i).begin(); m != (*i).end(); m++) {
+                            intersections.push_back(lineseg[index].pointAt((*m).ta));
+                        }
+                        index++;
+                    }
+                    //g_free(repr);
+                }
+
+                if (!ignore_1st_and_last){
+                    intersections.push_back(desktop->dt2doc(end_point));
+                }
+
+                //sort intersections
+                if (intersections.size()>2){
+                    std::sort(intersections.begin(), intersections.end(), GeomPointSortPredicate);
+                }
+
+                unsigned int idx;
+                for (idx=0; idx<measure_tmp_items.size(); idx++){
+                    desktop->remove_temporary_canvasitem(measure_tmp_items[idx]);
+                }
+                measure_tmp_items.clear();
+
+                for (idx=0;idx<intersections.size(); idx++){
+                    // Display the intersection indicator (i.e. the cross)
+                    SPCanvasItem * canvasitem = NULL;
+                    canvasitem = sp_canvas_item_new(sp_desktop_tempgroup (desktop),
+                                                    SP_TYPE_CTRL,
+                                                    "anchor", GTK_ANCHOR_CENTER,
+                                                    "size", 8.0,
+                                                    "stroked", TRUE,
+                                                    "stroke_color", 0xff0000ff,
+                                                    "mode", SP_KNOT_MODE_XOR,
+                                                    "shape", SP_KNOT_SHAPE_CROSS,
+                                                    NULL );
+
+                    SP_CTRL(canvasitem)->moveto(desktop->doc2dt(intersections[idx]));
+                    measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvasitem, 0));
+
+                }
+
+                SPUnitId unitid = static_cast<SPUnitId>(prefs->getInt("/tools/measure/unitid", SP_UNIT_PX));
+                SPUnit unit = sp_unit_get_by_id(unitid);
+
+                double fontsize = prefs->getInt("/tools/measure/fontsize");
+
+                Geom::Point previous_point;
+                if (intersections.size()>0)
+                    previous_point = intersections[0];
+
+                for (idx=1; idx < intersections.size(); idx++){
+                    Geom::Point measure_text_pos = (previous_point + intersections[idx])/2;
+//TODO: shift label a few pixels in the y coordinate
+
+                    double lengthval = (intersections[idx] - previous_point).length();
+                    sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), &unit);
+
+                    char* measure_str = (char*) malloc(sizeof(char)*20);
+                    sprintf(measure_str, "%.2f %s", lengthval, unit.abbr);
+                    SPCanvasItem *canvas_tooltip = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, desktop->dt2doc(measure_text_pos), measure_str);
+
+                    sp_canvastext_set_fontsize (SP_CANVASTEXT(canvas_tooltip), fontsize);
+
+                    measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvas_tooltip, 0));
+                    free(measure_str);
+                    previous_point = intersections[idx];
+                }
+
+                char* angle_str = (char*) malloc(sizeof(char)*20);
+                sprintf(angle_str, "%.2f °", angle * 180/3.1415 );
+                SPCanvasItem *canvas_tooltip = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, end_point + desktop->w2d(Geom::Point(5*fontsize,0)), angle_str);
+                sp_canvastext_set_fontsize (SP_CANVASTEXT(canvas_tooltip), fontsize);
+                sp_canvastext_set_rgba32 (SP_CANVASTEXT(canvas_tooltip), 0x337f33ff, 0xffffffff);
+
+                measure_tmp_items.push_back(desktop->add_temporary_canvasitem(canvas_tooltip, 0));
+                free(angle_str);
+
+                gobble_motion_events(GDK_BUTTON1_MASK);
+            }
+            break;
+        }
+
+      	case GDK_BUTTON_RELEASE:
+        {
+            if (line){
+                sp_canvas_item_hide(line);
+            }
+
+            unsigned int idx;
+            for (idx=0; idx<measure_tmp_items.size(); idx++){
+                desktop->remove_temporary_canvasitem(measure_tmp_items[idx]);
+            }
+            measure_tmp_items.clear();
+
+            if (mc->grabbed) {
+                sp_canvas_item_ungrab(mc->grabbed, event->button.time);
+                mc->grabbed = NULL;
+            }
+            xp = yp = 0;
+            break;
+        }
+	default:
+            break;
+    }
+
+    if (!ret) {
+        if (((SPEventContextClass *) parent_class)->root_handler) {
+            ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
+        }
+    }
+
+    return ret;
+}
+
+/*
+  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 :