1 files changed, 78 insertions, 0 deletions
diff --git a/qtruby/rubylib/examples/qt-examples/hello/hello.rb b/qtruby/rubylib/examples/qt-examples/hello/hello.rb
new file mode 100644
index 00000000..ce957c75
--- /dev/null
+++ b/qtruby/rubylib/examples/qt-examples/hello/hello.rb
@@ -0,0 +1,78 @@
+require 'Qt'
+
+class Hello < Qt::Widget
+
+	signals 'clicked()'
+	slots 'animate()'
+
+	# Constructs a Hello widget. Starts a 40 ms animation timer
+	def initialize (text)
+		super()
+
+		@b = 0
+		@text = text
+		@sin_tbl = [0, 38, 71, 92, 100, 92, 71, 38, 0, -38, -71, -92, -100, -92, -71, -38]
+		timer = Qt::Timer.new(self);
+		connect(timer, SIGNAL('timeout()'), SLOT('animate()'))
+		timer.start(40);
+
+		resize(260, 130)
+	end
+
+	#  This slot is called each time the timer fires.
+	def animate
+		@b = (@b + 1) & 15
+		repaint(false)
+	end
+	
+	# Handles mouse button release events for the Hello widget.
+	#
+	# We emit the clicked() signal when the mouse is released inside
+	# the widget.
+	def mouseReleaseEvent(e)
+		if (rect.contains(e.pos))
+			emit clicked
+		end
+	end
+
+	# Handles paint events for the Hello widget.
+	#
+	# Flicker-free update. The text is first drawn in the pixmap and the
+	# pixmap is then blt'ed to the screen.
+	def paintEvent(e)
+		if @text.empty?
+			return
+		end
+
+		# 1: Compute some sizes, positions etc.
+		fm = fontMetrics
+
+		w = fm.width(@text) + 20
+		h = fm.height * 2
+		pmx = width/2 - w/2
+		pmy = height/2 - h/2
+
+		# 2: Create the pixmap and fill it with the widget's background
+		pm = Qt::Pixmap.new(w, h)
+		pm.fill(self, pmx, pmy)
+
+		# 3: Paint the pixmap. Cool wave effect
+		p = Qt::Painter.new;
+		x = 10
+		y = h/2 + fm.descent
+		i = 0
+		p.begin(pm)
+		p.setFont(font)
+
+		for i in 0..@text.size-1
+			j = (@b+i) & 15
+			p.setPen(Qt::Color.new((15-j)*16,255,255,Qt::Color.Hsv) )
+			p.drawText( x, y-@sin_tbl[j]*h/800, @text[i,1], 1 )
+			x += fm.width(@text[i,1])
+		end
+		p.end
+
+		#4: Copy the pixmap to the Hello widget
+		bitBlt(self, pmx, pmy, pm)
+	end
+end