1. 卡尺区域的生成及绘制，基于GDI+完成图形绘制
实现代码：
else if(regionEx?.Region is SectorF)
{
SectorF sectorF=(SectorF)regionEx.Region;
graphics.DrawEllipse(MyPens.assist, sectorF.x / sizeratio, sectorF.y / sizeratio,
sectorF.width / sizeratio, sectorF.height / sizeratio);
graphics.DrawPie(new Pen(regionEx.Color, regionEx.Size),
sectorF.x / sizeratio, sector