topic Re: Overrule and polyline in ObjectARX Forum

Overrule and polyline

dhanraj.dhokale — Wed, 27 Nov 2019 06:49:54 GMT

I have implemented overrule, i want show line with different thickness on particular call, so I override method 'setAttributes' and in this i set thickness to 'AcGiDrawableTraits' but for polylines this does't work as for polyline in need to set globlal thickness.

One way I override wordDraw in overrule and then open polyline for modify and set constant thickness but this modifies entity and later i need to restore original thickness again on ending overrule.

Is there any way that using AcGiDrawableTraits I can set global thickness of polyline without calling setConstantThickness()?

Regards,

Dhanraj

Re: Overrule and polyline

tbrammer — Wed, 27 Nov 2019 14:01:00 GMT

I'm not sure what you want to do. It seems you're mixing width and thickness.

AcDbPolyline has no setConstantThickness() method. Only setConstantWidth(double) and

setWidthsAt(unsigned index, double start, double end) and setThickness(double).

"Thickness" means the extrusion lenght along the pline's plane normal.

"Width" means the width of a polyline segment in the pline's plane.

I think you want to modify the displayed width of a specific polyline segment. Right?

Maybe it works like this:

MyAcGiDrawableOverrule::worldDraw(AcGiDrawable* pSubject, AcGiWorldDraw * wd) {
	AcDbPolyline *myPline = AcDbPolyline::cast(pSubject);
	if (myPline) {
		AcDbPolyline *tempPline = AcDbPolyline::cast(myPline->clone()); // create a copy
		tempPline->setWidthsAt(m_myIndex, m_myWidth, m_myWidth);  // modify width at segment m_myIndex
		wd->geometry().geo.pline(*tempPline); // draw the temporary polyline
		delete tempPline; // CAUTION! Not sure whether GS still needs to access tempPline! Test!!!
	}
}

Re: Overrule and polyline

dhanraj.dhokale — Thu, 28 Nov 2019 10:08:46 GMT

Thanks for reply.

Sorry I mean 'setConstantWidth' not thickness.

cloning and setting thickness I tried already this works but this has some other issues in my application.

So I want to know is there any drawable trait property which can be set and polyline will be drawn accordingly.

I will try your solution, I think to set a property to line I will need to add this in database first.

Regards,

Dhanraj