qt5base-lts/examples/animation/stickman/stickman.cpp

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
** the names of its contributors may be used to endorse or promote
** products derived from this software without specific prior written
** permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
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****************************************************************************/
#include "stickman.h"
#include "node.h"
#include <QPainter>
#include <QTimer>
#define _USE_MATH_DEFINES
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
static const qreal Coords[NodeCount * 2] = {
0.0, -150.0, // head, #0
0.0, -100.0, // body pentagon, top->bottom, left->right, #1 - 5
-50.0, -50.0,
50.0, -50.0,
-25.0, 50.0,
25.0, 50.0,
-100.0, 0.0, // right arm, #6 - 7
-125.0, 50.0,
100.0, 0.0, // left arm, #8 - 9
125.0, 50.0,
-35.0, 75.0, // lower body, #10 - 11
35.0, 75.0,
-25.0, 200.0, // right leg, #12 - 13
-30.0, 300.0,
25.0, 200.0, // left leg, #14 - 15
30.0, 300.0
};
static const int Bones[BoneCount * 2] = {
0, 1, // neck
1, 2, // body
1, 3,
1, 4,
1, 5,
2, 3,
2, 4,
2, 5,
3, 4,
3, 5,
4, 5,
2, 6, // right arm
6, 7,
3, 8, // left arm
8, 9,
4, 10, // lower body
4, 11,
5, 10,
5, 11,
10, 11,
10, 12, // right leg
12, 13,
11, 14, // left leg
14, 15
};
StickMan::StickMan()
{
m_sticks = true;
m_isDead = false;
m_pixmap = QPixmap("images/head.png");
m_penColor = Qt::white;
m_fillColor = Qt::black;
// Set up start position of limbs
for (int i=0; i<NodeCount; ++i) {
m_nodes[i] = new Node(QPointF(Coords[i * 2], Coords[i * 2 + 1]), this);
connect(m_nodes[i], SIGNAL(positionChanged()), this, SLOT(childPositionChanged()));
}
for (int i=0; i<BoneCount; ++i) {
int n1 = Bones[i * 2];
int n2 = Bones[i * 2 + 1];
Node *node1 = m_nodes[n1];
Node *node2 = m_nodes[n2];
QPointF dist = node1->pos() - node2->pos();
m_perfectBoneLengths[i] = sqrt(pow(dist.x(),2) + pow(dist.y(),2));
}
startTimer(10);
}
StickMan::~StickMan()
{
}
void StickMan::childPositionChanged()
{
prepareGeometryChange();
}
void StickMan::setDrawSticks(bool on)
{
m_sticks = on;
for (int i=0;i<nodeCount();++i) {
Node *node = m_nodes[i];
node->setVisible(on);
}
}
QRectF StickMan::boundingRect() const
{
// account for head radius=50.0 plus pen which is 5.0
return childrenBoundingRect().adjusted(-55.0, -55.0, 55.0, 55.0);
}
int StickMan::nodeCount() const
{
return NodeCount;
}
Node *StickMan::node(int idx) const
{
if (idx >= 0 && idx < NodeCount)
return m_nodes[idx];
else
return 0;
}
void StickMan::timerEvent(QTimerEvent *)
{
update();
}
void StickMan::stabilize()
{
static const qreal threshold = 0.001;
for (int i=0; i<BoneCount; ++i) {
int n1 = Bones[i * 2];
int n2 = Bones[i * 2 + 1];
Node *node1 = m_nodes[n1];
Node *node2 = m_nodes[n2];
QPointF pos1 = node1->pos();
QPointF pos2 = node2->pos();
QPointF dist = pos1 - pos2;
qreal length = sqrt(pow(dist.x(),2) + pow(dist.y(),2));
qreal diff = (length - m_perfectBoneLengths[i]) / length;
QPointF p = dist * (0.5 * diff);
if (p.x() > threshold && p.y() > threshold) {
pos1 -= p;
pos2 += p;
node1->setPos(pos1);
node2->setPos(pos2);
}
}
}
QPointF StickMan::posFor(int idx) const
{
return m_nodes[idx]->pos();
}
//#include <QTime>
void StickMan::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
/* static int frames = 0;
static QTime time;
if (frames++ % 100 == 0) {
frames = 1;
time.restart();
}
if (time.elapsed() > 0) {
painter->setPen(Qt::white);
painter->drawText(0, 0, QString::number(frames / (time.elapsed() / 1000.0)));
}*/
stabilize();
if (m_sticks) {
painter->setPen(Qt::white);
for (int i=0; i<BoneCount; ++i) {
int n1 = Bones[i * 2];
int n2 = Bones[i * 2 + 1];
Node *node1 = m_nodes[n1];
Node *node2 = m_nodes[n2];
painter->drawLine(node1->pos(), node2->pos());
}
} else {
// first bone is neck and will be used for head
QPainterPath path;
path.moveTo(posFor(0));
path.lineTo(posFor(1));
// right arm
path.lineTo(posFor(2));
path.lineTo(posFor(6));
path.lineTo(posFor(7));
// left arm
path.moveTo(posFor(3));
path.lineTo(posFor(8));
path.lineTo(posFor(9));
// body
path.moveTo(posFor(2));
path.lineTo(posFor(4));
path.lineTo(posFor(10));
path.lineTo(posFor(11));
path.lineTo(posFor(5));
path.lineTo(posFor(3));
path.lineTo(posFor(1));
// right leg
path.moveTo(posFor(10));
path.lineTo(posFor(12));
path.lineTo(posFor(13));
// left leg
path.moveTo(posFor(11));
path.lineTo(posFor(14));
path.lineTo(posFor(15));
painter->setPen(QPen(m_penColor, 5.0, Qt::SolidLine, Qt::RoundCap));
painter->drawPath(path);
{
int n1 = Bones[0];
int n2 = Bones[1];
Node *node1 = m_nodes[n1];
Node *node2 = m_nodes[n2];
QPointF dist = node2->pos() - node1->pos();
qreal sinAngle = dist.x() / sqrt(pow(dist.x(), 2) + pow(dist.y(), 2));
qreal angle = asin(sinAngle) * 180.0 / M_PI;
QPointF headPos = node1->pos();
painter->translate(headPos);
painter->rotate(-angle);
painter->setBrush(m_fillColor);
painter->drawEllipse(QPointF(0,0), 50.0, 50.0);
painter->setBrush(m_penColor);
painter->setPen(QPen(m_penColor, 2.5, Qt::SolidLine, Qt::RoundCap));
// eyes
if (m_isDead) {
painter->drawLine(-30.0, -30.0, -20.0, -20.0);
painter->drawLine(-20.0, -30.0, -30.0, -20.0);
painter->drawLine(20.0, -30.0, 30.0, -20.0);
painter->drawLine(30.0, -30.0, 20.0, -20.0);
} else {
painter->drawChord(QRectF(-30.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);
painter->drawChord(QRectF(5.0, -30.0, 25.0, 70.0), 30.0*16, 120.0*16);
}
// mouth
if (m_isDead) {
painter->drawLine(-28.0, 2.0, 29.0, 2.0);
} else {
painter->setBrush(QColor(128, 0, 64 ));
painter->drawChord(QRectF(-28.0, 2.0-55.0/2.0, 57.0, 55.0), 0.0, -180.0*16);
}
// pupils
if (!m_isDead) {
painter->setPen(QPen(m_fillColor, 1.0, Qt::SolidLine, Qt::RoundCap));
painter->setBrush(m_fillColor);
painter->drawEllipse(QPointF(-12.0, -25.0), 5.0, 5.0);
painter->drawEllipse(QPointF(22.0, -25.0), 5.0, 5.0);
}
}
}
}