be15856f61
Change copyrights and license headers from Nokia to Digia Change-Id: If1cc974286d29fd01ec6c19dd4719a67f4c3f00e Reviewed-by: Lars Knoll <lars.knoll@digia.com> Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
201 lines
6.2 KiB
C++
201 lines
6.2 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
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** of its contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "mouse.h"
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#include <QGraphicsScene>
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#include <QPainter>
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#include <QStyleOption>
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#include <math.h>
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static const double Pi = 3.14159265358979323846264338327950288419717;
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static double TwoPi = 2.0 * Pi;
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static qreal normalizeAngle(qreal angle)
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{
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while (angle < 0)
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angle += TwoPi;
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while (angle > TwoPi)
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angle -= TwoPi;
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return angle;
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}
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//! [0]
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Mouse::Mouse()
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: angle(0), speed(0), mouseEyeDirection(0),
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color(qrand() % 256, qrand() % 256, qrand() % 256)
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{
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setRotation(qrand() % (360 * 16));
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}
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//! [0]
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//! [1]
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QRectF Mouse::boundingRect() const
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{
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qreal adjust = 0.5;
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return QRectF(-18 - adjust, -22 - adjust,
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36 + adjust, 60 + adjust);
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}
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//! [1]
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//! [2]
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QPainterPath Mouse::shape() const
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{
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QPainterPath path;
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path.addRect(-10, -20, 20, 40);
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return path;
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}
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//! [2]
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//! [3]
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void Mouse::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
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{
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// Body
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painter->setBrush(color);
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painter->drawEllipse(-10, -20, 20, 40);
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// Eyes
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painter->setBrush(Qt::white);
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painter->drawEllipse(-10, -17, 8, 8);
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painter->drawEllipse(2, -17, 8, 8);
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// Nose
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painter->setBrush(Qt::black);
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painter->drawEllipse(QRectF(-2, -22, 4, 4));
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// Pupils
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painter->drawEllipse(QRectF(-8.0 + mouseEyeDirection, -17, 4, 4));
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painter->drawEllipse(QRectF(4.0 + mouseEyeDirection, -17, 4, 4));
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// Ears
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painter->setBrush(scene()->collidingItems(this).isEmpty() ? Qt::darkYellow : Qt::red);
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painter->drawEllipse(-17, -12, 16, 16);
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painter->drawEllipse(1, -12, 16, 16);
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// Tail
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QPainterPath path(QPointF(0, 20));
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path.cubicTo(-5, 22, -5, 22, 0, 25);
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path.cubicTo(5, 27, 5, 32, 0, 30);
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path.cubicTo(-5, 32, -5, 42, 0, 35);
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painter->setBrush(Qt::NoBrush);
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painter->drawPath(path);
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}
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//! [3]
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//! [4]
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void Mouse::advance(int step)
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{
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if (!step)
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return;
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//! [4]
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// Don't move too far away
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//! [5]
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QLineF lineToCenter(QPointF(0, 0), mapFromScene(0, 0));
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if (lineToCenter.length() > 150) {
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qreal angleToCenter = ::acos(lineToCenter.dx() / lineToCenter.length());
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if (lineToCenter.dy() < 0)
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angleToCenter = TwoPi - angleToCenter;
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angleToCenter = normalizeAngle((Pi - angleToCenter) + Pi / 2);
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if (angleToCenter < Pi && angleToCenter > Pi / 4) {
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// Rotate left
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angle += (angle < -Pi / 2) ? 0.25 : -0.25;
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} else if (angleToCenter >= Pi && angleToCenter < (Pi + Pi / 2 + Pi / 4)) {
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// Rotate right
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angle += (angle < Pi / 2) ? 0.25 : -0.25;
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}
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} else if (::sin(angle) < 0) {
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angle += 0.25;
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} else if (::sin(angle) > 0) {
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angle -= 0.25;
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//! [5] //! [6]
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}
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//! [6]
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// Try not to crash with any other mice
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//! [7]
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QList<QGraphicsItem *> dangerMice = scene()->items(QPolygonF()
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<< mapToScene(0, 0)
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<< mapToScene(-30, -50)
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<< mapToScene(30, -50));
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foreach (QGraphicsItem *item, dangerMice) {
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if (item == this)
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continue;
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QLineF lineToMouse(QPointF(0, 0), mapFromItem(item, 0, 0));
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qreal angleToMouse = ::acos(lineToMouse.dx() / lineToMouse.length());
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if (lineToMouse.dy() < 0)
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angleToMouse = TwoPi - angleToMouse;
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angleToMouse = normalizeAngle((Pi - angleToMouse) + Pi / 2);
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if (angleToMouse >= 0 && angleToMouse < Pi / 2) {
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// Rotate right
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angle += 0.5;
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} else if (angleToMouse <= TwoPi && angleToMouse > (TwoPi - Pi / 2)) {
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// Rotate left
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angle -= 0.5;
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//! [7] //! [8]
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}
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//! [8] //! [9]
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}
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//! [9]
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// Add some random movement
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//! [10]
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if (dangerMice.size() > 1 && (qrand() % 10) == 0) {
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if (qrand() % 1)
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angle += (qrand() % 100) / 500.0;
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else
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angle -= (qrand() % 100) / 500.0;
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}
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//! [10]
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//! [11]
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speed += (-50 + qrand() % 100) / 100.0;
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qreal dx = ::sin(angle) * 10;
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mouseEyeDirection = (qAbs(dx / 5) < 1) ? 0 : dx / 5;
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setRotation(rotation() + dx);
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setPos(mapToParent(0, -(3 + sin(speed) * 3)));
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}
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//! [11]
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