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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>
// 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(currentValue);
repaintEvent(NULL);
}
} // GUI::
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