图象插值旋转源码。可以任意角度旋转图象，运行速度较快。由于使用了插值算法，旋转失真非常小。适合于对图象旋转要求较高的场合。-rotating source. Can arbitrary rotation angle images, run faster. Due to the use of interpolation algorithm, is very small rotational distortion. Suitable for image rotation for higher occ

编写了几个函数，通过直接调用就可以插值显示绘制gis栅格图-Write several functions that can be called directly interpolation draw GIS raster maps