WorldViz User Forum - Draw line and rotate it

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- - Draw line and rotate it (https://forum.worldviz.com/showthread.php?t=2230)

Draw line and rotate it

Hi,
I try to re-define my problem from the other thread:

I want to draw a line two ways:

1)

Code:

begin = [0,0,0]

end = [-2,1,2]



viz.startlayer(viz.LINES)

viz.linewidth(2)

viz.vertexcolor(viz.RED)

viz.vertex(begin)

viz.vertex(end)

viz.startlayer(viz.POINTS)

viz.pointsize(3)

viz.vertex(begin)                

viz.vertex(end)

dr = viz.endlayer()

and like this
2)

Code:

begin = [0,0,0]

end = [-2,1,2]



d = vizmat.Distance(begin,end)



viz.startlayer(viz.LINES)

viz.linewidth(2)

viz.vertexcolor(0,0,0.6)

viz.vertex(0,0,0)

viz.vertex(0,d,0)

viz.startlayer(viz.POINTS)

viz.pointsize(3)

viz.vertex(0,0,0)

viz.vertex(0,d,0)

drr = viz.endlayer()

drr.setPosition(begin)

drr.setEuler(0,0,-vizmat.AngleToPoint([begin[0],begin[1]],[end[0],end[1]]))

The rotation about the z-axis works very fine. (see scrennshot1)

But now I want to rotate the second line (the blue one) around the y-axis, too. So that I can see in the Top-View that the lines are exactly at the same place, the same direction, the same length and so on.

I've tested many ways, but I can't find a solution.

I've done:

Code:

drr.setEuler(-vizmat.AngleToPoint([begin[0],begin[2]],[end[0],end[2]]), 0, -vizmat.AngleToPoint([begin[0],begin[1]],[end[0],end[1]]))

and

Code:

drr.setEuler(vizmat.AngleToPoint([begin[0],begin[2]],[end[0],end[2]]), 0, -vizmat.AngleToPoint([begin[0],begin[1]],[end[0],end[1]]))

and

Code:

drr.setEuler(-vizmat.AngleToPoint([begin[2],begin[0]],[end[2],end[0]]), 0, -vizmat.AngleToPoint([begin[0],begin[1]],[end[0],end[1]]))

and

Code:

drr.setEuler(vizmat.AngleToPoint([begin[2],begin[0]],[end[2],end[0]]), 0, -vizmat.AngleToPoint([begin[0],begin[1]],[end[0],end[1]]))

but nothing works fine. Where is my mistake??

Thanks a lot....

In your second example, you are creating a line along the local Y-axis. So rotating that line around it's local Y-axis won't really do anything. Are you trying to draw 2D or 3D lines?

The lines should be drawn in 3D.

= = =

I want to draw three lines:

If I click with the left mousebutton, the first line would be drawn from P(0/0) to the acutal mouseposition and if I click again then the second one would be drawn, too. The z-value from the both lines is 0.

And now if I click a special button, I want to create a third line from the end of the first line to the end of the second line. This works fine if the z-values are 0.

BUT:

I'm possible to turn the two lines around the y-axis with the center at P(0/0).
So the z-values aren't 0.

And afterthat I want to create the third line and then it's wrong!

Hey,
is there really no possibility to solve my problem?

Isn't it possible to readout the angle of the first line and the z-axis and afterthat to rotate the line with the arrow about this value around the y-axis?

:confused::confused::confused:

Hey,
I've got another idea, to solve my problem. But therefore I should know, how to get the euler of my line.

So I draw a line like this:

Code:

begin = [0,0,0]

end = [2,1,2]



viz.startlayer(viz.LINES)

viz.linewidth(2)

viz.vertexcolor(viz.RED)

viz.vertex(begin)

viz.vertex(end)

viz.startlayer(viz.POINTS)

viz.pointsize(3)

viz.vertex(begin)                

viz.vertex(end)

dr = viz.endlayer()

And now I want to get the euler of this line.

But If I make

Code:

print dr.getEuler()

it is always [0, 0, 0].

Is it possible to get the euler of a drawn line?

Or the angles between the axes and my line.

Thanks a lot for all your help!

How can I get the euler of my line???