From 8521695565e41f5cce4f5b8cba6754d8cd0c8854 Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Sun, 2 Sep 2007 16:37:15 +0000
Subject: LPE: add RandomParam type.

(bzr r3662)
---
 src/live_effects/parameter/random.cpp | 194 ++++++++++++++++++++++++++++++++++
 1 file changed, 194 insertions(+)
 create mode 100644 src/live_effects/parameter/random.cpp

(limited to 'src/live_effects/parameter/random.cpp')

diff --git a/src/live_effects/parameter/random.cpp b/src/live_effects/parameter/random.cpp
new file mode 100644
index 000000000..846c2f9e8
--- /dev/null
+++ b/src/live_effects/parameter/random.cpp
@@ -0,0 +1,194 @@
+#define INKSCAPE_LIVEPATHEFFECT_PARAMETER_RANDOM_CPP
+
+/*
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/parameter/random.h"
+#include "live_effects/effect.h"
+#include "svg/svg.h"
+#include "libnr/nr-values.h"
+
+#include <gtkmm.h>
+#include "ui/widget/random.h"
+
+#include "svg/stringstream.h"
+
+#include "verbs.h"
+
+#define noLPERANDOMPARAM_DEBUG
+
+namespace Inkscape {
+
+namespace LivePathEffect {
+
+
+RandomParam::RandomParam( const Glib::ustring& label, const Glib::ustring& tip,
+                      const Glib::ustring& key, Inkscape::UI::Widget::Registry* wr,
+                      Effect* effect, gdouble default_value, long default_seed)
+    : Parameter(label, tip, key, wr, effect)
+{
+    defvalue = default_value;
+    value = defvalue;
+    min = -NR_HUGE;
+    max = NR_HUGE;
+    integer = false;
+    regrandom = NULL;
+
+    defseed = default_seed;
+    startseed = defseed;
+    seed = startseed;
+}
+
+RandomParam::~RandomParam()
+{
+    if (regrandom)
+        delete regrandom;
+}
+
+bool
+RandomParam::param_readSVGValue(const gchar * strvalue)
+{
+    double newval, newstartseed;
+    gchar** stringarray = g_strsplit (strvalue, ";", 2);
+    unsigned int success = sp_svg_number_read_d(stringarray[0], &newval);
+    if (success == 1) {
+        success += sp_svg_number_read_d(stringarray[1], &newstartseed);
+        if (success == 2) {
+            param_set_value(newval, newstartseed);
+        } else {
+            param_set_value(newval, defseed);
+        }
+        g_strfreev(stringarray);
+        return true;
+    }
+    g_strfreev(stringarray);
+    return false;
+}
+
+gchar *
+RandomParam::param_writeSVGValue() const
+{
+    Inkscape::SVGOStringStream os;
+    os << value << ';' << startseed;
+    gchar * str = g_strdup(os.str().c_str());
+    return str;
+}
+
+void
+RandomParam::param_set_default() 
+{
+    param_set_value(defvalue, defseed);
+}
+
+void
+RandomParam::param_set_value(gdouble val, long newseed) 
+{
+    value = val;
+    if (integer)
+        value = round(value);
+    if (value > max)
+        value = max;
+    if (value < min)
+        value = min;
+
+    startseed = setup_seed(newseed);
+    seed = startseed;
+
+    if (regrandom)
+        regrandom->setValue(value, startseed);
+}
+
+void
+RandomParam::param_set_range(gdouble min, gdouble max) 
+{
+    this->min = min;
+    this->max = max;
+    if (regrandom)
+        regrandom->getR()->setRange(min, max);
+
+    param_set_value(value, startseed); // reset value, to check whether it is in range
+}
+
+void
+RandomParam::param_make_integer(bool yes)
+{
+    integer = yes;
+    if (regrandom) {
+        regrandom->getR()->setDigits(0);
+        regrandom->getR()->setIncrements(1, 10);
+    }
+}
+
+void
+RandomParam::resetRandomizer()
+{
+    seed = startseed;
+}
+
+
+Gtk::Widget *
+RandomParam::param_getWidget()
+{
+    // TODO: add  a button to set a different startseed
+    if (!regrandom) {
+        regrandom = new Inkscape::UI::Widget::RegisteredRandom();
+        regrandom->init(param_label, param_tooltip, param_key, *param_wr, param_effect->getRepr(), param_effect->getSPDoc());
+        regrandom->setValue(value, startseed);
+        if (integer)
+            param_make_integer();
+
+        regrandom->set_undo_parameters(SP_VERB_DIALOG_LIVE_PATH_EFFECT, _("Change random parameter"));
+    }
+    return dynamic_cast<Gtk::Widget *> (regrandom->getR());
+}
+
+RandomParam::operator gdouble()
+{
+    return rand() * value;
+};
+
+/* RNG stolen from /display/nr-filter-turbulence.cpp */
+#define RAND_m 2147483647 /* 2**31 - 1 */
+#define RAND_a 16807 /* 7**5; primitive root of m */
+#define RAND_q 127773 /* m / a */
+#define RAND_r 2836 /* m % a */
+#define BSize 0x100
+
+long
+RandomParam::setup_seed(long lSeed)
+{
+  if (lSeed <= 0) lSeed = -(lSeed % (RAND_m - 1)) + 1;
+  if (lSeed > RAND_m - 1) lSeed = RAND_m - 1;
+  return lSeed;
+}
+
+// generates random number between 0 and 1
+gdouble
+RandomParam::rand()
+{
+  long result;
+  result = RAND_a * (seed % RAND_q) - RAND_r * (seed / RAND_q);
+  if (result <= 0) result += RAND_m;
+  seed = result;
+
+  gdouble dresult = (gdouble)(result % BSize) / BSize;
+  return dresult;
+}
+
+
+} /* namespace LivePathEffect */
+} /* namespace Inkscape */
+
+/*
+  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 :
-- 
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