private void drawRotatedArrow(GraphicsPlus graphics)
{
Debug.WriteLine("drawRotatedArrow: " + this.rotationAngle, this.ToString());
Point center = new Point(this.Width / 2, this.Height / 2);
int arWidthHalf = ARROW_WIDTH / 2;
//int arHeightHalf = ARROW_HEIGHT / 2;
Point[] arrowPoints =
{
new Point(center.X, center.Y - arWidthHalf),
new Point(center.X - 2 * arWidthHalf / 3, center.Y + arWidthHalf),
new Point(center.X + 2 * arWidthHalf / 3, center.Y + arWidthHalf),
new Point(center.X, center.Y + arWidthHalf / 2)
};
Debug.WriteLine("drawRotatedArrow: points "
+ PointUtil.pointsStr(arrowPoints), this.ToString());
PointMath.RotatePoints(arrowPoints, center, this.rotationAngle);
Debug.WriteLine("drawRotatedArrow: points "
+ PointUtil.pointsStr(arrowPoints), this.ToString());
graphics.SetSmoothingMode(SmoothingMode.SmoothingModeAntiAlias);
PenPlus pen = new PenPlus(ARROW_COLOR, 3);
pen.SetEndCap(LineCap.LineCapRound);
pen.SetStartCap(LineCap.LineCapRound);
graphics.DrawLine(pen, new GpPoint(arrowPoints[0].X, arrowPoints[0].Y),
new GpPoint(arrowPoints[1].X, arrowPoints[1].Y));
graphics.DrawLine(pen, new GpPoint(arrowPoints[1].X, arrowPoints[1].Y),
new GpPoint(arrowPoints[3].X, arrowPoints[3].Y));
graphics.DrawLine(pen, new GpPoint(arrowPoints[3].X, arrowPoints[3].Y),
new GpPoint(arrowPoints[2].X, arrowPoints[2].Y));
graphics.DrawLine(pen, new GpPoint(arrowPoints[2].X, arrowPoints[2].Y),
new GpPoint(arrowPoints[0].X, arrowPoints[0].Y));
pen.Dispose();
}