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=begin
**
** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Translated to QtRuby by Richard Dale
=end
# In the original C++ example the Mouse class inherited from both
# QObject and QGraphicsItem. As that isn't possible in Ruby, use
# a helper class 'MouseTimer' to periodically invoke the
# Mouse.timerEvent() method.
class MouseTimer < Qt::Object
def initialize(mouse)
super(nil)
@mouse = mouse
end
def timerEvent(event)
@mouse.timerEvent(event)
end
end
class Mouse < Qt::GraphicsItem
TwoPi = 2.0 * Math::PI
def self.normalizeAngle(angle)
while angle < 0 do
angle += TwoPi
end
while angle > TwoPi do
angle -= TwoPi
end
return angle
end
def initialize()
super(nil)
@angle = 0.0
@speed = 0.0
@mouseEyeDirection = 0.0
@color = Qt::Color.new(rand(256), rand(256), rand(256))
rotate(rand(360 * 16))
adjust = 0.5
@boundingRect = Qt::RectF.new(-20 - adjust, -22 - adjust,
40 + adjust, 83 + adjust)
@timer = MouseTimer.new(self)
@timer.startTimer(1000 / 33)
end
def boundingRect
return @boundingRect
end
def shape
path = Qt::PainterPath.new
path.addRect(-10, -20, 20, 40)
return path
end
def paint(painter, arg, widget)
# Body
painter.brush = Qt::Brush.new(@color)
painter.drawEllipse(-10, -20, 20, 40)
# Eyes
painter.brush = Qt::Brush.new(Qt::white)
painter.drawEllipse(-10, -17, 8, 8)
painter.drawEllipse(2, -17, 8, 8)
# Nose
painter.brush = Qt::Brush.new(Qt::black)
painter.drawEllipse(Qt::RectF.new(-2, -22, 4, 4))
# Pupils
painter.drawEllipse(Qt::RectF.new(-8.0 + @mouseEyeDirection, -17, 4, 4))
painter.drawEllipse(Qt::RectF.new(4.0 + @mouseEyeDirection, -17, 4, 4))
# Ears
painter.brush = Qt::Brush.new(scene.collidingItems(self).empty? ? Qt::darkYellow : Qt::red)
painter.drawEllipse(-17, -12, 16, 16)
painter.drawEllipse(1, -12, 16, 16)
# Tail
path = Qt::PainterPath.new(Qt::PointF.new(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.brush = Qt::NoBrush
painter.drawPath(path)
end
def timerEvent(event)
# Don't move too far away
lineToCenter = Qt::LineF.new(Qt::PointF.new(0, 0), mapFromScene(0, 0))
if lineToCenter.length() > 150
angleToCenter = Math.acos(lineToCenter.dx / lineToCenter.length)
if lineToCenter.dy < 0
angleToCenter = TwoPi - angleToCenter
end
angleToCenter = Mouse.normalizeAngle((Math::PI - angleToCenter) + Math::PI / 2)
if angleToCenter < Math::PI && angleToCenter > Math::PI / 4
# Rotate left
@angle += (@angle < -Math::PI / 2) ? 0.25 : -0.25
elsif angleToCenter >= Math::PI && angleToCenter < (Math::PI + Math::PI / 2 + Math::PI / 4)
# Rotate right
@angle += (@angle < Math::PI / 2) ? 0.25 : -0.25
end
elsif Math.sin(@angle) < 0
@angle += 0.25
elsif Math.sin(@angle) > 0
@angle -= 0.25
end
# Try not to crash with any other mice
dangerMice = scene.items(Qt::PolygonF.new([mapToScene(0, 0),
mapToScene(-30, -50),
mapToScene(30, -50)]))
dangerMice.each do |item|
if item == self
next
end
lineToMouse = Qt::LineF.new(Qt::PointF.new(0, 0), mapFromItem(item, 0, 0))
angleToMouse = Math.acos(lineToMouse.dx / lineToMouse.length)
if lineToMouse.dy < 0
angleToMouse = TwoPi - angleToMouse
end
angleToMouse = Mouse.normalizeAngle((Math::PI - angleToMouse) + Math::PI / 2)
if angleToMouse >= 0 && angleToMouse < Math::PI / 2
# Rotate right
@angle += 0.5
elsif angleToMouse <= TwoPi && angleToMouse > (TwoPi - Math::PI / 2)
# Rotate left
@angle -= 0.5
end
end
# Add some random movement
if dangerMice.size > 1 && rand(10) == 0
if rand(1) == 1
@angle += rand(100) / 500.0
else
@angle -= rand(100) / 500.0
end
end
@speed += (-50 + rand(100)) / 100.0
dx = Math.sin(@angle) * 10
@mouseEyeDirection = ((dx / 5).abs < 1) ? 0 : dx / 5
rotate(dx)
setPos(mapToParent(0, -(3 + Math.sin(@speed) * 3)))
end
end
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