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needlestyle.cpp
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needlestyle.cpp
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/*************************************************************************************
** The MIT License (MIT)
**
** Knobs is a free Qt and QML based widget.
** Copyright (c) 2015 Ashish Dabhade
** Email: ashishd157@gmail.com
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to deal
** in the Software without restriction, including without limitation the rights
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
** copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in all
** copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
** SOFTWARE.
************************************************************************************/
#include "needlestyle.h"
#define M_180_D_PI 180/M_PI
NeedleStyle::NeedleStyle(QQuickItem *parent) :
QQuickPaintedItem(parent),
m_value(0),
m_minValue(0),
m_maxValue(100),
m_percent(0),
m_readOnly(false),
m_color(QColor(135,206,235)),
m_mode(NeedleStyle::Normal),
m_style(Style::Point),
m_factor(3.6),
m_scale(m_factor),
m_angle(-90),
m_offset(90.0)
{
setAntialiasing(true);
#if defined Q_OS_LINUX || defined Q_OS_MAC
setRenderTarget(QQuickPaintedItem::FramebufferObject);
#endif
}
void NeedleStyle::paint(QPainter *painter)
{
qreal w = width()-1.0;
qreal h = height();
qreal d = 0.0;
painter->setPen(Qt::NoPen);
painter->setBrush(m_color);
painter->save();
painter->translate(w/2,h/2);
painter->scale(1.0,1.0);
painter->rotate(m_angle);
switch(m_style)
{
case NeedleStyle::Point: {
d = 3.0;
static const QPoint points[3] = {
QPoint(0, 14),
QPoint(0, -14),
QPoint(w/2 - 5, 0)
};
painter->drawConvexPolygon(points, 3);
break;
}
case NeedleStyle::Round: {
d = 3.0;
painter->drawRoundedRect(0,-10,w/2-5,20,10,10);
break;
}
case NeedleStyle::Groove: {
d = 2.4;
static qreal wd = w/12.0;
static qreal p = (w/2.0) - wd/2.0;
QRectF r(p-wd/2.0,-wd/2.0,wd,wd);
QRadialGradient g(r.center(),wd);
g.setColorAt(0,QColor(0,191,255));
g.setColorAt(1,Qt::black);
painter->setPen(Qt::NoPen);
painter->setBrush(g);
painter->drawEllipse(r);
break;
}
}
painter->restore();
painter->setBrush(Qt::white);
painter->drawEllipse(boundingRect().center(),w/d,w/d);
}
int NeedleStyle::endValueFromPoint(qreal x, qreal y)
{
qreal theta = qAtan2(x,-y);
qreal angle = fmod((theta * M_180_D_PI) + 360,360);
int v = qCeil(angle / m_scale) + m_minValue;
return m_mode==NeedleStyle::Percent ? (v-m_minValue)*100/(m_maxValue-m_minValue) : v;
}
void NeedleStyle::classBegin()
{}
void NeedleStyle::componentComplete()
{
m_anim = children().first()->children().first();
}
bool NeedleStyle::animationRunning()
{
return m_anim->property("running").toBool();
}
void NeedleStyle::setValue(int arg)
{
if (m_value == arg)
return;
m_value = arg;
if(m_value>m_maxValue)
m_value = m_maxValue;
if(m_value<m_minValue)
m_value = m_minValue;
int diff = (m_value-m_minValue);
m_angle = (diff * m_factor) - m_offset;
m_percent = diff*100/(m_maxValue-m_minValue);
if(m_mode == NeedleStyle::Normal) {
emit percentChanged(m_percent);
emit valueChanged(m_value);
} else {
emit valueChanged(m_value);
emit percentChanged(m_percent);
}
update();
}
void NeedleStyle::setMinValue(int arg)
{
if (m_minValue == arg)
return;
m_minValue = arg;
m_value = m_minValue;
emit minValueChanged(arg);
}
void NeedleStyle::setMaxValue(int arg)
{
m_maxValue = arg;
m_factor = 360.0/(m_maxValue-m_minValue);
m_scale = m_factor;
if (m_maxValue == arg)
return;
emit maxValueChanged(arg);
}
void NeedleStyle::setPercent(int arg)
{
if (m_percent == arg)
return;
m_percent = arg;
int value = qCeil(m_percent*(m_maxValue-m_minValue)/100.0) + m_minValue;
setValue(value);
}