//在画板上画出这块区域
public void drawRegion(Graphics dc)
{
//使用XorGdi类的静态方法画出区域矩形
XorGdi.DrawRectangle(dc, PenStyles.PS_DASHDOTDOT, 2, Color.LightSeaGreen, regionRect.Left, regionRect.Top, regionRect.Right, regionRect.Bottom);
foreach (Line l in linesInRegion)
{
dc.DrawLine(new Pen(Color.Black), l.P1, l.P2);
}
}
public void SetMousePoint(Graphics dc, PointF mousepoint)
{
if (m_point2 != PointF.Empty)
{
XorGdi.DrawRectangle(dc, PenStyles.PS_DOT, 1, GetColor(), m_point1, m_point2);
}
m_point2 = mousepoint;
XorGdi.DrawRectangle(dc, PenStyles.PS_DOT, 1, GetColor(), m_point1, m_point2);
}