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138 lines
3.4 KiB
138 lines
3.4 KiB
include Math
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require 'Qt'
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class CannonField < Qt::Widget
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signals 'angleChanged(int)', 'forceChanged(int)'
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slots 'setAngle(int)', 'setForce(int)', 'shoot()', 'moveShot()'
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def initialize(parent, name)
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super
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@ang = 45
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@f = 0
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@timerCount = 0;
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@autoShootTimer = Qt::Timer.new( self, 'movement handler' )
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connect( @autoShootTimer, SIGNAL('timeout()'),
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self, SLOT('moveShot()') );
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@shoot_ang = 0
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@shoot_f = 0
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setPalette( Qt::Palette.new( Qt::Color.new( 250, 250, 200) ) )
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@barrelRect = Qt::Rect.new(33, -4, 15, 8)
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end
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def setAngle( degrees )
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if degrees < 5
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degrees = 5
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elsif degrees > 70
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degrees = 70
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end
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if @ang == degrees
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return
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end
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@ang = degrees
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repaint( cannonRect(), false )
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emit angleChanged( @ang )
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end
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def setForce( newton )
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if newton < 0
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newton = 0
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end
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if @f == newton
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return
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end
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@f = newton
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emit forceChanged( @f )
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end
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def shoot()
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if @autoShootTimer.isActive()
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return
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end;
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@timerCount = 0
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@shoot_ang = @ang
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@shoot_f = @f
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@autoShootTimer.start( 50 )
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end
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def moveShot()
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r = Qt::Region.new( shotRect() )
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@timerCount += 1
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shotR = shotRect()
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if shotR.x() > width() || shotR.y() > height()
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@autoShootTimer.stop()
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else
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r = r.unite( Qt::Region.new( shotR ) )
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end
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repaint( r )
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end
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def paintEvent( e )
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updateR = e.rect()
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p = Qt::Painter.new( self )
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if updateR.intersects( cannonRect() )
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paintCannon( p )
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end
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if @autoShootTimer.isActive() &&
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updateR.intersects( shotRect() )
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paintShot( p )
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end
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p.end()
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end
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def paintShot( p )
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p.setBrush( black )
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p.setPen( Qt::NoPen )
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p.drawRect( shotRect() )
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end
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def paintCannon(p)
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cr = cannonRect()
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pix = Qt::Pixmap.new( cr.size() )
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pix.fill( self, cr.topLeft() )
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tmp = Qt::Painter.new( pix )
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tmp.setBrush( blue )
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tmp.setPen( Qt::NoPen )
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tmp.translate( 0, pix.height() - 1 )
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tmp.drawPie( Qt::Rect.new(-35, -35, 70, 70), 0, 90*16 )
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tmp.rotate( - @ang )
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tmp.drawRect( @barrelRect )
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tmp.end()
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p.drawPixmap(cr.topLeft(), pix )
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end
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def cannonRect()
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r = Qt::Rect.new( 0, 0, 50, 50)
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r.moveBottomLeft( rect().bottomLeft() )
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return r
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end
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def shotRect()
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gravity = 4.0
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time = @timerCount / 4.0
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velocity = @shoot_f
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radians = @shoot_ang*3.14159265/180.0
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velx = velocity*cos( radians )
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vely = velocity*sin( radians )
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x0 = ( @barrelRect.right() + 5.0 )*cos(radians)
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y0 = ( @barrelRect.right() + 5.0 )*sin(radians)
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x = x0 + velx*time
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y = y0 + vely*time - 0.5*gravity*time*time
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r = Qt::Rect.new( 0, 0, 6, 6 );
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r.moveCenter( Qt::Point.new( x.round, height() - 1 - y.round ) )
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return r
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end
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def sizePolicy()
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return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
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end
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end
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