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#include "mouse.h"
#include <QGraphicsScene>
#include <QPainter>
#include <QStyleOption>
#include <math.h>
static const double Pi = 3.14159265358979323846264338327950288419717;
static double TwoPi = 2.0 * Pi;
static qreal normalizeAngle(qreal angle)
{
while (angle < 0)
angle += TwoPi;
while (angle > TwoPi)
angle -= TwoPi;
return angle;
}
Mouse::Mouse()
: angle(0), speed(0), mouseEyeDirection(0),
color(qrand() % 256, qrand() % 256, qrand() % 256)
{
rotate(qrand() % (360 * 16));
startTimer(1000 / 33);
}
QRectF Mouse::boundingRect() const
{
qreal adjust = 0.5;
return QRectF(-18 - adjust, -22 - adjust,
36 + adjust, 60 + adjust);
}
QPainterPath Mouse::shape() const
{
QPainterPath path;
path.addRect(-10, -20, 20, 40);
return path;
}
void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
<span class="comment">// Body</span>
painter->setBrush(color);
painter->drawEllipse(-10, -20, 20, 40);
<span class="comment">// Eyes</span>
painter->setBrush(Qt::white);
painter->drawEllipse(-10, -17, 8, 8);
painter->drawEllipse(2, -17, 8, 8);
<span class="comment">// Nose</span>
painter->setBrush(Qt::black);
painter->drawEllipse(QRectF(-2, -22, 4, 4));
<span class="comment">// Pupils</span>
painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4));
painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));
<span class="comment">// Ears</span>
painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);
painter->drawEllipse(-17, -12, 16, 16);
painter->drawEllipse(1, -12, 16, 16);
<span class="comment">// Tail</span>
QPainterPath path(QPointF(0, 20));
path.cubicTo(-5, 22, -5, 22, 0, 25);
path.cubicTo(5, 27, 5, 32, 0, 30);
path.cubicTo(-5, 32, -5, 42, 0, 35);
painter->setBrush(Qt::NoBrush);
painter->drawPath(path);
}
void Mouse::timerEvent(QTimerEvent *)
{
<span class="comment">// Don't move too far away</span>
QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));
if (lineToCenter.length() > 150) {
qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length());
if (lineToCenter.dy() < 0)
angleToCenter = TwoPi - angleToCenter;
angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);
if (angleToCenter < Pi && angleToCenter > Pi / 4) {
<span class="comment">// Rotate left</span>
angle += (angle < -Pi / 2) ? 0.25 : -0.25;
} else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {
<span class="comment">// Rotate right</span>
angle += (angle < Pi / 2) ? 0.25 : -0.25;
}
} else if (::sin(angle) < 0) {
angle += 0.25;
} else if (::sin(angle) > 0) {
angle -= 0.25;
}
<span class="comment">// Try not to crash with any other mice</span>
QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()
<< mapToScene(0, 0)
<< mapToScene(-30, -50)
<< mapToScene(30, -50));
foreach (QGraphicsItem *item, dangerMice) {
if (item == this)
continue;
QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));
qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length());
if (lineToMouse.dy() < 0)
angleToMouse = TwoPi - angleToMouse;
angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);
if (angleToMouse >= 0 && angleToMouse < Pi / 2) {
<span class="comment">// Rotate right</span>
angle += 0.5;
} else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {
<span class="comment">// Rotate left</span>
angle -= 0.5;
}
}
<span class="comment">// Add some random movement</span>
if (dangerMice.size() > 1 && (qrand() % 10) == 0) {
if (qrand() % 1)
angle += (qrand() % 100) / 500.0;
else
angle -= (qrand() % 100) / 500.0;
}
speed += (-50 + qrand() % 100) / 100.0;
qreal dx = ::sin(angle) * 10;
mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;
rotate(dx);
setPos(mapToParent(0, -(3 + sin(speed) * 3)));
}</pre>
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