Introducing our new nice measurement tool! :-D

(bzr r10259)

1 files changed, 237 insertions, 0 deletions

diff --git a/src/measure-context.cpp b/src/measure-context.cpp
new file mode 100644
index 000000000..1e0339424
--- /dev/null
+++ b/src/measure-context.cpp
@@ -0,0 +1,237 @@
+/*
+ * 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 "macros.h"
+#include "display/sp-ctrlline.h"
+#include "display/sp-canvas-item.h"
+#include "display/sp-canvas-util.h"
+#include "desktop.h"
+#include "pixmaps/cursor-measure.xpm"
+#include "preferences.h"
+#include "inkscape.h"
+#include "desktop-handles.h"
+#include "measure-context.h"
+#include "display/canvas-text.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;
+SPCanvasItem *measure_text = NULL;
+
+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 = 3;
+    event_context->hot_y = 5;
+}
+
+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;
+}
+
+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);
+            }
+
+            if (!measure_text){
+                measure_text = sp_canvastext_new(sp_desktop_tempgroup(desktop), desktop, start_point, "");
+                SP_CANVASTEXT(measure_text)->rgba = 0x7f7f7fff;
+                sp_canvastext_set_anchor(SP_CANVASTEXT(measure_text), -1, 1);//why?
+            }
+
+            sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point, start_point);
+            sp_canvastext_set_text (SP_CANVASTEXT(measure_text), "");
+            sp_canvas_item_show (line);
+            sp_canvas_item_show (measure_text);
+
+            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));
+
+                sp_ctrlline_set_coords (SP_CTRLLINE(line), start_point[Geom::X], start_point[Geom::Y], motion_dt[Geom::X], motion_dt[Geom::Y]);
+
+                Geom::Point measure_text_pos = (start_point + motion_dt)/2;
+                double length = (start_point - motion_dt).length();
+                char* measure_str = (char*) malloc(sizeof(char)*20);
+                sprintf(measure_str, "%2f", length);
+
+                sp_canvastext_set_coords (SP_CANVASTEXT(measure_text), desktop->dt2doc(measure_text_pos));
+                sp_canvastext_set_text (SP_CANVASTEXT(measure_text), measure_str);
+                free(measure_str);
+
+                gobble_motion_events(GDK_BUTTON1_MASK);
+            }
+            break;
+        }
+
+      	case GDK_BUTTON_RELEASE:
+        {
+            if (line){
+                sp_canvas_item_hide(line);
+            }
+
+            if (measure_text){
+                sp_canvas_item_hide(measure_text);
+            }
+
+            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 :