地震资料处理时计算二维测线交点的程序,有弯线也能用-seismic data processing, calculate 2-D lines of the intersection of procedures, it also can be used curved lines

计算两直线交点，计算多边形交点，绘制多边形，绘制等高线，测试裁剪多边形等测绘算法-Calculation of the intersection of the lines, calculating polygon intersection point, draw a polygon, draw contour test cutting polygons mapping algorithm