store default size in lpe::ArrayParam

[inkscape.git] / src / live_effects / lpe-path_length.cpp

diff --git a/src/live_effects/lpe-path_length.cpp b/src/live_effects/lpe-path_length.cpp
index d2aea13d89a32957270c9967b90ca9d3ae5555f9..e33a160025ccf7fdbce09ddaeaf4c747371fbdbe 100644 (file)
--- a/src/live_effects/lpe-path_length.cpp
+++ b/src/live_effects/lpe-path_length.cpp
@@ -13,6 +13,7 @@
  */
 
 #include "live_effects/lpe-path_length.h"
+#include "sp-metrics.h"
 
 #include "2geom/sbasis-geometric.h"
 
@@ -21,13 +22,15 @@ namespace LivePathEffect {
 
 LPEPathLength::LPEPathLength(LivePathEffectObject *lpeobject) :
     Effect(lpeobject),
-    info_text(_("Info text"), _("Parameter for text creation"), "info_text", &wr, this, "")
+    scale(_("Scale"), _("Scaling factor"), "scale", &wr, this, 1.0),
+    info_text(this),
+    unit(_("Unit"), _("Unit"), "unit", &wr, this),
+    display_unit(_("Display unit"), _("Print unit after path length"), "display_unit", &wr, this, true)
 {
-    /* uncomment the next line if you want the original path to be
-       permanently displayed as a helperpath while the item is selected */
-    //show_orig_path = true;
-
+    registerParameter(dynamic_cast<Parameter *>(&scale));
     registerParameter(dynamic_cast<Parameter *>(&info_text));
+    registerParameter(dynamic_cast<Parameter *>(&unit));
+    registerParameter(dynamic_cast<Parameter *>(&display_unit));
 }
 
 LPEPathLength::~LPEPathLength()
@@ -35,22 +38,36 @@ LPEPathLength::~LPEPathLength()
 
 }
 
+void
+LPEPathLength::hideCanvasText() {
+    // this is only used in sp-lpe-item.cpp to hide the canvas text when the effect is invisible
+    info_text.param_setValue("");
+}
+
 Geom::Piecewise<Geom::D2<Geom::SBasis> >
 LPEPathLength::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
 {
     using namespace Geom;
 
-    gchar *arc_length = g_strdup_printf("%.2f", Geom::length(pwd2_in));
+    /* convert the measured length to the correct unit ... */
+    double lengthval = Geom::length(pwd2_in) * scale;
+    gboolean success = sp_convert_distance(&lengthval, &sp_unit_get_by_id(SP_UNIT_PX), unit);
+
+    /* ... set it as the canvas text ... */
+    gchar *arc_length = g_strdup_printf("%.2f %s", lengthval,
+                                        display_unit ? (success ? unit.get_abbreviation() : "px") : "");
     info_text.param_setValue(arc_length);
     g_free(arc_length);
 
-    info_text.setPosAndAnchor(pwd2_in, 0.5, 20);
+    info_text.setPosAndAnchor(pwd2_in, 0.5, 10);
 
+    // TODO: how can we compute the area (such that cw turns don't count negative)?
+    //       should we display the area here, too, or write a new LPE for this?
     Piecewise<D2<SBasis> > A = integral(pwd2_in);
     Point c;
     double area;
     if (centroid(pwd2_in, c, area)) {
-        g_print ("Area is zero\n");
+        //g_print ("Area is zero\n");
     }
     //g_print ("Area: %f\n", area);