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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/***************************************************************************
+ * knob.cc
+ *
+ * Thu Feb 28 07:37:27 CET 2013
+ * Copyright 2013 Bent Bisballe Nyeng
+ * deva@aasimon.org
+ ****************************************************************************/
+
+/*
+ * This file is part of DrumGizmo.
+ *
+ * DrumGizmo is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * DrumGizmo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with DrumGizmo; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+#include "knob.h"
+
+#include "painter.h"
+
+#include <hugin.hpp>
+#include <stdio.h>
+#include <math.h>
+
+GUI::Knob::Knob(Widget *parent)
+ : GUI::Widget(parent)
+{
+ state = up;
+
+ val = 0.0;
+ maximum = 1.0;
+ minimum = 0.0;
+ mouse_offset_x = 0;
+
+ handler = NULL;
+ ptr = NULL;
+}
+
+void GUI::Knob::setValue(float v)
+{
+ val = v;
+ if(handler) handler(ptr);
+ repaintEvent(NULL);
+}
+
+float GUI::Knob::value()
+{
+ return val;
+}
+
+void GUI::Knob::registerClickHandler(void (*handler)(void *), void *ptr)
+{
+ this->handler = handler;
+ this->ptr = ptr;
+}
+
+void GUI::Knob::mouseMoveEvent(MouseMoveEvent *e)
+{
+ if(state == down) {
+ /*
+ DEBUG(slider, "Knob::mouseMoveEvent(mouse_offset_x: %d, e->x: %d)\n",
+ mouse_offset_x, e->x);
+ */
+ if(mouse_offset_x == (e->x + -1*e->y)) return;
+
+ float dval = mouse_offset_x - (e->x + -1*e->y);
+ val -= dval / 300.0;
+
+ if(val < 0) val = 0;
+ if(val > 1) val = 1;
+
+ if(handler) handler(ptr);
+ repaintEvent(NULL);
+
+ mouse_offset_x = e->x + -1*e->y;
+ }
+}
+
+void GUI::Knob::buttonEvent(ButtonEvent *e)
+{
+ if(e->direction == 1) {
+ state = down;
+ mouse_offset_x = e->x + -1*e->y;
+ //val = maximum / (float)width() * (float)e->x;
+ if(handler) handler(ptr);
+ repaintEvent(NULL);
+ }
+ if(e->direction == -1) {
+ state = up;
+ mouse_offset_x = e->x + -1*e->y;
+ //val = maximum / (float)width() * (float)e->x;
+ repaintEvent(NULL);
+ clicked();
+ if(handler) handler(ptr);
+ }
+}
+
+void GUI::Knob::repaintEvent(GUI::RepaintEvent *e)
+{
+ // DEBUG(slider, "Knob::repaintEvent (%f)\n", val);
+
+ Painter p(this);
+
+ float alpha = 0.8;
+
+ p.setColour(Colour(0, 0));
+ p.drawFilledRectangle(0,0,width()-1,height()-1);
+
+ if(hasKeyboardFocus()) {
+ p.setColour(Colour(0.6, alpha));
+ } else {
+ p.setColour(Colour(0.5, alpha));
+ }
+
+ int radius = (width()>height()?height():width()) / 2;
+ int center_x = width() / 2;
+ int center_y = height() / 2;
+
+ p.setColour(Colour(1, alpha));
+
+ char buf[64];
+ sprintf(buf, "%.2f", val * maximum);
+ Font font;
+ p.drawText(center_x - font.textWidth(buf) / 2,
+ center_y + font.textHeight(buf) / 2, font, buf);
+
+ p.setColour(Colour(0.5, 0.5, 1, alpha));
+
+ p.drawCircle(center_x, center_y, radius);
+
+ double padval = val * 0.8 + 0.1;
+ double border_x = sin((-1 * padval + 1) * 2 * M_PI);
+ double border_y = cos((-1 * padval + 1) * 2 * M_PI);
+
+ p.setColour(Colour(1, 0, 0, alpha));
+ p.drawLine(border_x * (radius / 2) + center_x,
+ border_y * (radius / 2) + center_y,
+ border_x * radius + center_x,
+ border_y * radius + center_y);
+}
+
+#ifdef TEST_KNOB
+//Additional dependency files
+//deps:
+//Required cflags (autoconf vars may be used)
+//cflags:
+//Required link options (autoconf vars may be used)
+//libs:
+#include "test.h"
+
+TEST_BEGIN;
+
+// TODO: Put some testcode here (see test.h for usable macros).
+
+TEST_END;
+
+#endif/*TEST_KNOB*/