[求助]：如何量显一个LWPOLYLIE的某个段？

LoveArx

最近论坛上来了好多高手，可喜可贺，看过了NONAME朋友的几篇文章，受益匪浅。

我想要量显AcDbPolyline 的某个段，请NONAME朋友和其他高手给予帮忙，谢谢！

noname

客气了：）
你提出的这个问题，我也曾经探讨过，据我所知，直接而又简单的解决方案是没有的。
但是，我看到过这样一个例子，从acdbpolyline派生了一个类，每一段的颜色是不一样的，我想可以仿照这样来实现你的想法。

noname

Question
How do I create a polyline type custom entity with different attributes for each
segment?
Answer
The following sample code does this. Only the color attribute of each segment of
polyline is handled. Similarly this
method can be extended to have other attributes for each of segement of
polyline. Derive your custom object class from
AcDbPolyline.

The attachment contains the complete code for this application, here we will
just look at the worldDraw() function as follows
where XXX is the name of your custom class derived from AcDbPolyline:
Adesk::Boolean XXX::worldDraw(AcGiWorldDraw* mode)
{
        assertReadEnabled();
       
        // more code here
        // more code here

        AcGePoint3d PlinePts[2];
        Adesk::UInt16 uiColor;

        // TODO: implement this function.
        Adesk::Int8 iLen = m_ClrSeg.length();

        // walk trough each segment and set the attributes.
        for(int i =0; i < iLen; i++)
        {
                // find the vertices of the (i)th segment int PlinePts[0] and
PlinePts[1]
                this->getPointAt(i, PlinePts[0]);
                this->getPointAt(i+1, PlinePts[1]);
               
                mode->subEntityTraits().setSelectionMarker(i+1); // select
marker.
               
                // more code here
                // more code here
                mode->subEntityTraits().setColor(uiColor);// set the color

                mode->geometry().polyline(2, PlinePts);//stored in the graphics
database
        }
        // more code here
        // more code here

        return Adesk::kTrue;;
}
A sample project is attached to this solution. The key feature of the sample
project is drawing a simple custom multi colored
polyline like entity. It allows the user to pick a number of arbitrary points.
While creating the polyline it assigns
different color to each of the segment.

i_want_2

noname的文章是从哪里找到的？

noname

有些是前辈的资料，有些是自己的心得，有些是autodesk的资料：）