tilegrids.py 文件源码

def tileAddress(self, zoom, point):
        "Returns a tile address based on a zoom level and \
        a point in the tile"
        [x, y] = point
        assert x <= self.extent[2] and x >= self.extent[0]
        assert y <= self.extent[3] and y >= self.extent[1]
        assert zoom in range(0, len(self.RESOLUTIONS))

        tileS = self.tileSize(zoom)
        offsetX = abs(x - self.MINX)
        if self.originCorner == 'bottom-left':
            offsetY = abs(y - self.MINY)
        elif self.originCorner == 'top-left':
            offsetY = abs(self.MAXY - y)
        col = offsetX / tileS
        row = offsetY / tileS
        # We are exactly on the edge of a tile and the extent
        if x in (self.MINX, self.MAXX) and col.is_integer():
            col = max(0, col - 1)
        if y in (self.MINY, self.MAXY) and row.is_integer():
            row = max(0, row - 1)
        return [
            int(math.floor(col)),
            int(math.floor(row))
        ]