Class: Car
- Inherits:
- Qt::GraphicsItem show all
- Defined in:
- ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb
Overview
Note that as Ruby doesn’t have multiple inheritance, and ‘Car’, can’t inherit from Qt::Object as well as Qt::Graphics item. So the timerEvent event handling is done in the CarAdaptor instance which is a Qt::Object, which calls back to the Car instance.
Instance Method Summary collapse
- #accelerate ⇒ Object
- #boundingRect ⇒ Object
- #decelerate ⇒ Object
-
#initialize ⇒ Car
constructor
A new instance of Car.
- #paint(painter, option, widget) ⇒ Object
- #timerEvent(event) ⇒ Object
- #turnLeft ⇒ Object
- #turnRight ⇒ Object
Methods inherited from Qt::GraphicsItem
Methods inherited from Qt::Base
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Constructor Details
#initialize ⇒ Car
Returns a new instance of Car.
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 70 def initialize() super @color = Qt::Brush.new(Qt::green) @wheelsAngle = 0.0 @speed = 0.0 setFlag(Qt::GraphicsItem::ItemIsMovable, true) setFlag(Qt::GraphicsItem::ItemIsFocusable, true) end |
Instance Method Details
#accelerate ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 79 def accelerate() if @speed < 10 @speed += 1 end end |
#boundingRect ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 66 def boundingRect() return Qt::RectF.new(-35, -81, 70, 115) end |
#decelerate ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 85 def decelerate() if @speed > -10 @speed -= 1 end end |
#paint(painter, option, widget) ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 103 def paint(painter, option, ) painter.brush = Qt::Brush.new(Qt::gray) painter.drawRect(-20, -58, 40, 2) # front axel painter.drawRect(-20, 7, 40, 2) # rear axel painter.brush = @color painter.drawRect(-25, -79, 50, 10) # front wing painter.drawEllipse(-25, -48, 50, 20) # side pods painter.drawRect(-25, -38, 50, 35) # side pods painter.drawRect(-5, 9, 10, 10) # back pod painter.drawEllipse(-10, -81, 20, 100) # main body painter.drawRect(-17, 19, 34, 15) # rear wing painter.brush = Qt::Brush.new(Qt::black) painter.drawPie(-5, -51, 10, 15, 0, 180 * 16) painter.drawRect(-5, -44, 10, 10) # cocpit painter.save() painter.translate(-20, -58) painter.rotate(@wheelsAngle) painter.drawRect(-10, -7, 10, 15) # front left painter.restore() painter.save() painter.translate(20, -58) painter.rotate(@wheelsAngle) painter.drawRect(0, -7, 10, 15) # front left painter.restore() painter.drawRect(-30, 0, 12, 17) # rear left painter.drawRect(19, 0, 12, 17) # rear right end |
#timerEvent(event) ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 139 def timerEvent(event) axelDistance = 54 wheelsAngleRads = (@wheelsAngle * Math::PI) / 180 turnDistance = Math.cos(wheelsAngleRads) * axelDistance * 2 turnRateRads = wheelsAngleRads / turnDistance # rough estimate turnRate = (turnRateRads * 180) / Math::PI rotation = @speed * turnRate rotate(rotation) translate(0, -@speed) update() end |
#turnLeft ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 91 def turnLeft() if @wheelsAngle > -30 @wheelsAngle -= 5 end end |
#turnRight ⇒ Object
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# File 'ext/ruby/qtruby/examples/qdbus/remotecontrolledcar/car/car.rb', line 97 def turnRight() if @wheelsAngle < 30 @wheelsAngle += 5 end end |