improve the drag and drop to draw line
improve the drag and drop to draw line

imlidian/containerops,genedna/containerops,Huawei/containerops,crystaldust/containerops,Lupino/containerops,imlidian/containerops,crystaldust/containerops,genedna/containerops,Lupino/containerops,Lupino/containerops,crystaldust/containerops,genedna/containerops,imlidian/containerops,crystaldust/containerops,Lupino/containerops,Huawei/containerops,imlidian/containerops,Lupino/containerops,imlidian/containerops,genedna/containerops,Lupino/containerops,Lupino/containerops,genedna/containerops,imlidian/containerops,Huawei/containerops,crystaldust/containerops,crystaldust/containerops,genedna/containerops,Huawei/containerops,imlidian/containerops,crystaldust/containerops,Huawei/containerops,genedna/containerops,Huawei/containerops,Huawei/containerops