将图像作为背景添加到DXF

如何在DXF中添加图像作为背景

问题： 如何在DXF中添加图像作为背景。

提示： 为背景图像创建一个CadRasterImageDef对象，为绘图插入背景创建一个CadRasterImage对象，向绘图实体添加一个CadRasterImage对象。

示例：

CadRasterImageDef rasterImageDef = new CadRasterImageDef("background.jpg", 0, 0);
rasterImageDef.ObjectHandle = "RefID";
rasterImageDef.SoftOwner = cadImage.Layouts["Model"].BlockTableRecordHandle;
rasterImageDef.FileName = "background.jpg";

// inserts RasterImage inside dxf
CadRasterImage rasterImage = new CadRasterImage(
    rasterImageDef,
    new Cad3DPoint(2700, 1300, 0), new Cad3DPoint(0.5, 0, 0), new Cad3DPoint(0, 0.5, 0));

rasterImage.ObjectHandle = newObjectID;
rasterImage.SoftOwner = cadImage.Layouts["Model"].BlockTableRecordHandle;
rasterImage.LayerName = "0";
rasterImage.ImageDefReference = "RefID";
rasterImage.DisplayFlags = 1;
rasterImage.InsertionPoint.X = 2700;
rasterImage.InsertionPoint.Y = 1300;
rasterImage.UVector.X = 0.5;
rasterImage.VVector.Y = 0.5;


List<CadBaseEntity> entities = new List<CadBaseEntity>(cadImage.Entities);
entities.Insert(
    0,
    rasterImage); // add to the beginning to fill image with background, entities will be above
cadImage.Entities = entities.ToArray();

List<CadBaseObject> objects = new List<CadBaseObject>(cadImage.Objects);
objects.Add(rasterImageDef);
cadImage.Objects = objects.ToArray();
cadImage.Save(...)