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