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#include "knob.h"
#include "painter.h"
#include <hugin.hpp>
#include <stdio.h>
#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* scrollEvent)
{
float value = currentValue - (scrollEvent->delta / 200.0);
internalSetValue(value);
}
void Knob::mouseMoveEvent(MouseMoveEvent* mouseMoveEvent)
{
if(state == down)
{
if(mouse_offset_x == (mouseMoveEvent->x + (-1 * mouseMoveEvent->y)))
{
return;
}
float dval =
mouse_offset_x - (mouseMoveEvent->x + (-1 * mouseMoveEvent->y));
float value = currentValue - (dval / 300.0);
internalSetValue(value);
mouse_offset_x = mouseMoveEvent->x + (-1 * mouseMoveEvent->y);
}
}
void Knob::keyEvent(KeyEvent* keyEvent)
{
if(keyEvent->direction != Direction::up)
{
return;
}
float value = currentValue;
switch(keyEvent->keycode) {
case Key::up:
value += 0.01;
break;
case Key::down:
value -= 0.01;
break;
case Key::right:
value += 0.01;
break;
case Key::left:
value -= 0.01;
break;
case Key::home:
value = 0;
break;
case Key::end:
value = 1;
break;
default:
break;
}
internalSetValue(value);
}
void Knob::buttonEvent(ButtonEvent* buttonEvent)
{
if(buttonEvent->direction == Direction::down)
{
state = down;
mouse_offset_x = buttonEvent->x + (-1 * buttonEvent->y);
}
if(buttonEvent->direction == Direction::up)
{
state = up;
mouse_offset_x = buttonEvent->x + (-1 * buttonEvent->y);
clicked();
}
}
void Knob::repaintEvent(RepaintEvent* repaintEvent)
{
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);
p.drawText(center_x - font.textWidth(buf) / 2 + 1,
center_y + font.textHeight(buf) / 2 + 1, font, buf);
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;
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(nullptr);
}
}
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