1 files changed, 167 insertions, 0 deletions
diff --git a/plugingui/knob.cc b/plugingui/knob.cc
new file mode 100644
index 0000000..75a7278
--- /dev/null
+++ b/plugingui/knob.cc
@@ -0,0 +1,167 @@
+/* -*- 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*/