Basic project based on DrumGizmo.

1 files changed, 188 insertions, 0 deletions

diff --git a/plugingui/knob.cc b/plugingui/knob.cc
new file mode 100644
index 0000000..b843106
--- /dev/null
+++ b/plugingui/knob.cc
@@ -0,0 +1,188 @@
+/* -*- 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>
+
+// M_PI is not defined in math.h if __STRICT_ANSI__ is defined.
+#ifdef __STRICT_ANSI__
+#undef __STRICT_ANSI__
+#endif
+#include <math.h>
+
+namespace GUI {
+
+Knob::Knob(Widget *parent)
+  : Widget(parent)
+  , img_knob(":knob.png")
+{
+  state = up;
+
+  maximum = 1.0;
+  minimum = 0.0;
+
+  currentValue = minimum;
+
+  mouse_offset_x = 0;
+}
+
+void Knob::setValue(float value)
+{
+  internalSetValue(value);
+}
+
+float Knob::value()
+{
+  return currentValue;
+}
+
+void Knob::scrollEvent(ScrollEvent *e)
+{
+  float value = currentValue - (e->delta / 200.0);
+  internalSetValue(value);
+}
+
+void Knob::mouseMoveEvent(MouseMoveEvent *e)
+{
+  if(state == down) {
+    if(mouse_offset_x == (e->x + -1 * e->y)) {
+      return;
+    }
+
+    float dval = mouse_offset_x - (e->x + -1 * e->y);
+    float value = currentValue - (dval / 300.0);
+
+    internalSetValue(value);
+
+    mouse_offset_x = e->x + -1 * e->y;
+  }
+}
+
+void Knob::keyEvent(KeyEvent *e)
+{
+  if(e->direction != -1) {
+    return;
+  }
+
+  float value = currentValue;
+  switch(e->keycode) {
+  case KeyEvent::KEY_UP:
+    value += 0.01;
+    break;
+  case KeyEvent::KEY_DOWN:
+    value -= 0.01;
+    break;
+  case KeyEvent::KEY_RIGHT:
+    value += 0.01;
+    break;
+  case KeyEvent::KEY_LEFT:
+    value -= 0.01;
+    break;
+  case KeyEvent::KEY_HOME:
+    value = 0;
+    break;
+  case KeyEvent::KEY_END:
+    value = 1;
+    break;
+  default:
+    break;
+  }
+
+  internalSetValue(value);
+}
+
+void Knob::buttonEvent(ButtonEvent *e)
+{
+  if(e->direction == 1) {
+    state = down;
+    mouse_offset_x = e->x + -1*e->y;
+  }
+  if(e->direction == -1) {
+    state = up;
+    mouse_offset_x = e->x + -1*e->y;
+    clicked();
+  }
+}
+
+void Knob::repaintEvent(RepaintEvent *e)
+{
+  int diameter = (width()>height()?height():width());
+  int radius = diameter / 2;
+  int center_x = width() / 2;
+  int center_y = height() / 2;
+
+  Painter p(this);
+
+  p.clear();
+  p.drawImageStretched(0, 0, &img_knob, diameter, diameter);
+
+  char buf[64];
+  sprintf(buf, "%.2f", currentValue * maximum);
+  Font font;
+  p.drawText(center_x - font.textWidth(buf) / 2 + 1,
+             center_y + font.textHeight(buf) / 2 + 1, font, buf);
+
+  // Make it start from 20% and stop at 80%
+  double padval = currentValue * 0.8 + 0.1;
+
+  double from_x = sin((-1 * padval + 1) * 2 * M_PI) * radius * 0.6;
+  double from_y = cos((-1 * padval + 1) * 2 * M_PI) * radius * 0.6;
+
+  double to_x = sin((-1 * padval + 1) * 2 * M_PI) * radius * 0.8;
+  double to_y = cos((-1 * padval + 1) * 2 * M_PI) * radius * 0.8;
+
+  // Draw "fat" line by drawing 9 lines with moved start/ending points.
+  p.setColour(Colour(1, 0, 0, 1));
+  for(int _x = -1; _x < 2; _x++) {
+    for(int _y = -1; _y < 2; _y++) {
+      p.drawLine(from_x + center_x + _x,
+                 from_y + center_y + _y,
+                 to_x + center_x + _x,
+                 to_y + center_y + _y);
+
+    }
+  }
+}
+
+void Knob::internalSetValue(float value)
+{
+  if(value < minimum) value = minimum;
+  if(value > maximum) value = maximum;
+
+  if(value == currentValue) {
+    return;
+  }
+
+  currentValue = value;
+  valueChangedNotifier.notify(currentValue);
+  repaintEvent(NULL);
+}
+
+} // GUI::