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-rw-r--r--qtruby/rubylib/tutorial/t12/cannon.rb173
1 files changed, 173 insertions, 0 deletions
diff --git a/qtruby/rubylib/tutorial/t12/cannon.rb b/qtruby/rubylib/tutorial/t12/cannon.rb
new file mode 100644
index 00000000..1b72cbc0
--- /dev/null
+++ b/qtruby/rubylib/tutorial/t12/cannon.rb
@@ -0,0 +1,173 @@
+include Math
+require 'Qt'
+
+class CannonField < Qt::Widget
+
+ signals 'hit()', 'missed()', 'angleChanged(int)', 'forceChanged(int)'
+ slots 'setAngle(int)', 'setForce(int)', 'shoot()', 'moveShot()', 'newTarget()'
+
+ 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
+ @target = Qt::Point.new(0, 0)
+ setPalette( Qt::Palette.new( Qt::Color.new( 250, 250, 200) ) )
+ newTarget()
+ @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
+
+ @@first_time = true
+
+ def newTarget()
+ if @@first_time
+ @@first_time = false
+ midnight = Qt::Time.new( 0, 0, 0 )
+ srand( midnight.secsTo(Qt::Time.currentTime()) )
+ end
+ r = Qt::Region.new( targetRect() )
+ @target = Qt::Point.new( 200 + rand(190),
+ 10 + rand(255) )
+ repaint( r.unite( Qt::Region.new(targetRect()) ) )
+ end
+
+ def moveShot()
+ r = Qt::Region.new( shotRect() )
+ @timerCount += 1
+
+ shotR = shotRect()
+
+ if shotR.intersects( targetRect() )
+ @autoShootTimer.stop()
+ emit hit()
+ elsif shotR.x() > width() || shotR.y() > height()
+ @autoShootTimer.stop()
+ emit missed()
+ 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
+ if updateR.intersects( targetRect() )
+ paintTarget( p )
+ end
+ p.end()
+ end
+
+ def paintShot( p )
+ p.setBrush( black )
+ p.setPen( Qt::NoPen )
+ p.drawRect( shotRect() )
+ end
+
+ def paintTarget( p )
+ p.setBrush( red )
+ p.setPen( black )
+ p.drawRect( targetRect() )
+ 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 targetRect()
+ r = Qt::Rect.new( 0, 0, 20, 10 )
+ r.moveCenter( Qt::Point.new(@target.x(),height() - 1 - @target.y()) );
+ return r
+ end
+
+ def sizePolicy()
+ return Qt::SizePolicy.new( Qt::SizePolicy::Expanding, Qt::SizePolicy::Expanding )
+ end
+end