InitializeTurtleGraphics - Turtleグラフィックス描画機能の初期化

初期設定

SetViewPort 0, 0, 639, 479
SetGraphicsWindow 0, 479, 639, 0

gLineWidth = 1#
gLineStyle = msoLineSingle
gDashStyle = msoLineSolid
gLineColor = QBColor(0)

TGSetPoint 319, 0
TGSetAngle 90