#!/usr/bin/env ruby

require "qte"
require "qpe"
include Qte
include Qpe


class SampleWindow < QMainWindow
   def initialize()
      super()
      setCaption(tr("サンプル"))
      @msg = QLabel.new(tr("描画のサンプル"),self)
      @msg.setGeometry(0,0,310,35)

      self.update()   # paintEvent発生
#     self.repaint()

      catchEvent
   end

   # 描画する式の定義
   def function(x)
       Math.sin(x / 40.0) * 150
#      (x ** 3) / 10000
   end

   # 描画
   def draw
      @p = QPainter.new
      @pen = QPen.new( Qt::black, 1)  # 黒、幅１
      @p.begin(self)                  # 描画開始
      @p.setPen(@pen)
      @p.drawLine(0, 240, 640, 240)
      @p.drawLine(320, 0, 320, 480)

      @pen.setColor( Qt::blue )       # 青
      @p.setPen(@pen)
      x = -320
      y = function(x)
      @p.moveTo(x + 320, 240 - y)     # 初期座標設定
      for x in -319 .. 319
         y = function(x)
         @p.lineTo(x + 320, 240 - y)  # 一つ前の座標から線をひく
#        @p.drawPoint(x + 320, 240 - y) # 点を打つ
      end
      @p.end                          # 描画終了
   end

   def paintEvent(p)
      draw
   end
end

$defaultCodec = QTextCodec.codecForName("utf8")
app = QPEApplication.new([$0]+ARGV)
app.setDefaultCodec($defaultCodec)
QApplication.setFont(QFont.new("lcfont",18))
app.showMainWidget(SampleWindow.new)
app.exec