1、打开CAD 选择插入 光栅图像,选择图片保存的位置;
![](https://iknow-pic.cdn.bcebos.com/738b4710b912c8fcba0b81bcf2039245d78821c2?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
2、鼠标左键随意拖动大小 松手放置图片后,点击确认;
![](https://iknow-pic.cdn.bcebos.com/34fae6cd7b899e519a1f4d654ca7d933c8950d29?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
3、找到图片内可参考数值的位置;
![](https://iknow-pic.cdn.bcebos.com/8b82b9014a90f603c523e8363712b31bb051ed34?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
4、将现处图层颜色 改为显眼的颜色,为了捕捉时容易区分;
![](https://iknow-pic.cdn.bcebos.com/83025aafa40f4bfb5964e9250d4f78f0f736180e?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
5、输入直线命令,将参照物两边基准点连接;
![](https://iknow-pic.cdn.bcebos.com/8c1001e93901213f95bf39ad5ae736d12f2e9536?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
6、以第一基准点为起始点,按照刚才那条直线方向 手动输入实际数值(例图输入1500)回车 得到一条1500长线段;
![](https://iknow-pic.cdn.bcebos.com/dcc451da81cb39db3c4f1027de160924ab183037?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
7、将图片及线段全选上;
![](https://iknow-pic.cdn.bcebos.com/a71ea8d3fd1f4134f3be720f2b1f95cad1c85e31?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
8、选取第一基准点,点击一次鼠标左键,然键入R 空格,重新选取第一基准点,之后点选第二基准点,拖动鼠标向实际数值线段第二端点移动点选;
![](https://iknow-pic.cdn.bcebos.com/79f0f736afc37931a3e0f158e5c4b74543a91132?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
9、输入标注命令(dli) 复合图片是否正确即可;
![](https://iknow-pic.cdn.bcebos.com/11385343fbf2b21187cdf23fc48065380dd78edb?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)