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/* Copyright (c) 2013, 2015 Stanislaw Halik <sthalik@misaki.pl>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*/
#include "pose-widget.hpp"
#include "compat/check-visible.hpp"
#include "compat/math.hpp"
#include <QPainter>
#include <QtEvents>
#include <QDebug>
#include <QQuaternion>
#include <QMatrix4x4>
namespace pose_widget_impl {
pose_widget::pose_widget(QWidget* parent) : QWidget(parent)
{
QPainter p;
#ifdef TEST
//draw rectangle frame around of Octopus, only if TEST defined
p.begin(&front);
p.setPen(QPen(Qt::red, 3, Qt::SolidLine));
p.drawRect(0, 0, front.width()-1, front.height()-1);
p.end();
p.begin(&back);
p.setPen(QPen(Qt::darkGreen, 3, Qt::SolidLine));
p.drawRect(0, 0, back.width()-1, back.height()-1);
p.end();
#endif
//draw Octopus shine
shine.fill(QColor(255,255,255));
p.begin(&shine);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.drawImage(QPointF(0,0), front);
p.end();
//draw Octopus shadow
shadow.fill(QColor(0,0,0));
p.begin(&shadow);
p.setCompositionMode(QPainter::CompositionMode_DestinationIn);
p.drawImage(QPointF(0,0), front);
p.end();
mirror.setFocusPolicy(Qt::NoFocus);
}
void pose_widget::present(double yaw, double pitch, double roll, double x, double y, double z)
{
T = { x, y, z };
R = { yaw, pitch, roll };
repaint();
}
void pose_widget::resizeEvent(QResizeEvent *event)
{
// adapt to widget size
float w = event->size().width();
float h = event->size().height();
// move the mirror checkbox in the lower right corner of the widget
mirror.setSizePolicy(QSizePolicy::Minimum, QSizePolicy::Minimum);
mirror.move(w - mirror.width(), h - mirror.height());
}
void pose_widget::paintEvent(QPaintEvent*)
{
// widget settings:
constexpr float scale = 0.5; // scale of Octopus height, when x = y = z = 0.0
constexpr float XYZmax = 50.0; // -XYZmax < x,y,z < +XYZmax (offset the Octopus by one body)
constexpr float Kz = 0.25; // Z scale change limit (simulate camera focus length)
// get a local copy of input data
auto [ yaw, pitch, roll ] = R;
auto [ x, y, z ] = T;
QPainter p(this);
#ifdef TEST
// use antialiasing for correct frame around the Octopus, only if TEST defined
p.setRenderHint(QPainter::Antialiasing, true);
#endif
{
p.fillRect(rect(), palette().brush(backgroundRole()));
// draw axes
p.save();
p.setPen(QPen(Qt::gray, 1, Qt::SolidLine));
int w = width(), h = height();
p.drawLine(w/2, 0, w/2, h);
p.drawLine( 0, h/2, w, h/2);
p.restore();
}
// check mirror state
if (mirror.checkState() == Qt::Checked) x = -x;
else { yaw = -yaw; roll = -roll; }
y = -y;
// rotations
QQuaternion q = QQuaternion::fromEulerAngles(pitch, yaw, roll);
QMatrix4x4 m = QMatrix4x4(q.toRotationMatrix());
// x and y positions
const float Kxy = (float)front.height() / XYZmax;
QVector3D v(Kxy*x, Kxy*y, 0.0);
v = m.transposed().map(v);
m.translate(v);
// perspective projection to x-y plane
QTransform t = m.toTransform(1024).translate(-.5 * front.width(), -.5 * front.height());
// z position by setViewport
const float mz = scale * height()/front.height()/exp(1.0) * exp(1.0 - z * (Kz/XYZmax));
p.setViewport(QRect(.5 * width(), .5 * height(), width()*mz, height()*mz));
// define forward or backward side by cross product of mapped x and y axes
QPointF point0 = t.map(QPointF(0, 0));
QPointF x_dir = (t.map(QPointF(1, 0)) -= point0);
QPointF y_dir = (t.map(QPointF(0, 1)) -= point0);
const bool forward = x_dir.ry()*y_dir.rx() - x_dir.rx()*y_dir.ry() < 0 ? true : false;
// draw red or green Octopus
p.setTransform(t);
p.drawImage(QPointF(0,0), forward ? front : back);
// top lighting simulation
const float alpha = sin(pitch * M_PI / 180.0);
p.setOpacity(0.333 * fabs(alpha));
p.drawImage(QPointF(0,0), forward == (alpha >= 0.0) ? shine : shadow);
}
} // ns pose_widget_impl
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