[求助]：请看看这个对象该怎么创建

miaoyp

我想从AcDbEntity类中派生一个类（下面的jpg），线可以用worldDraw()->geometry().polyline(),但中间的填充用什么函数呢?
另外AcGeLine3d通常用在什么地方，它与AcDbLine有什么区别,请高手指教.

miaoyp

我已知道了AcDbLine 与 AcGeLine3d 的区别了，AcGe 类是纯数学的，它们不是实体。只是用于计算

miaoyp

线是可以画的，但填充却没有这个函数，如果在worldDraw()中用AcDbHatch，那每次图形更新，就会创建一个AcDbHatch

XDSoft

你可以使用：

AcGiGeometry

AcGiGeometry Primitive Drawing Functions

  AcGiGeometry::pline

virtual Adesk::Boolean
pline(
    const AcDbPolyline& lwBuf,
    Adesk::UInt32 fromIndex = 0,

    Adesk::UInt32 numSegs = 0) const = 0;

lwBuf        Input AcDbPolyline from which to copy geometry
fromIndex        Input starting vertex index
numSegs        Input the number of segments to copy

This function uses the AcDbPolyline lwBuf as the template for the geometry it draws. Starting at the vertex with index fromIndex, it generates display geometry that duplicates the geometry of the polyline's next numSegs segments.
A return value of Adesk::kFalse (that is, 0) indicates that the primitive has been successfully stored in the graphics database. A return value of Adesk::kTrue indicates that the operation has been terminated and the application wants to get control back as soon as possible.

这个方法允许你使用一个AcDbPolyline作模板，你可以把这个AcDbPolyline设置宽度。

miaoyp

就用AcGiWorldGeometry::polygon就行了.

XDSoft

最初由 miaoyp 发布
[B]就用AcGiWorldGeometry::polygon就行了. [/B]

能把类的完整代码给大家贴到论坛吗？谢谢！

miaoyp

AcGePoint3d p1,p2 ,p3,p4,p5,p6;
AcGePoint3dArray parray1,parray2;
//
给这六个点付值
//
parray1.append(p1);
...
parray1.append(p6);
worldDraw->subEntityTraits().setColor(1);
worldDraw->subEntityTraits().setFillType(kAcGiFillAlways);
worldDraw->geometry().polygon(6,parray1.asArrayPtr());
parray2.append(p1);
...
parray2.append(p6);
parray2.append(p1);
worldDraw->subEntityTraits().setColor(7);
worldDraw->subEntityTraits().setSelectionMarker(2)
worldDraw->geometry().polyline(7,parray2.asArrayPtr());

先用polygon填充，在用polyline画出外边的黑线

leyou12250

很有用！！多谢

missyou0515

AcDbHatch pHatch ;//画岩性
        pHatch.setAssociative(Adesk::kFalse);
        CString PatternName="ANSI31";
        pHatch.setPatternScale(0.5);
        if(pHatch.setPattern(AcDbHatch::kPreDefined,PatternName)==Acad::eInvalidInput)
        {
                if(pHatch.setPattern(AcDbHatch::kCustomDefined,PatternName)==Acad::eInvalidInput)
                             MessageBox(NULL, PatternName+="调用图案文件名失败_","失败",NULL);
        }
        pHatch.setHatchStyle(AcDbHatch::kNormal);
        AcGeDoubleArray vertexBulges;
        pHatch.appendLoop(AcDbHatch::kExternal, vertexPts, vertexBulges); //设外边界
        pHatch.evaluateHatch();
        pHatch.worldDraw(pW);  //自己搞自己 pW为worldDraw中的那个 AcGiWorldDraw* pW 这有点象递归
        pHatch.close();       
        在这里可以不用指针new一个，指针的隐患太多，能不用的少用一些为好