How to draw the Xline like AutoCAD in MicroStation

Looking at this previous discussion about the AutoCad command XLine, or Construction line, there is no specific equivalent within MicroStation. You can however use the Construction Class of element to place a construction element.

Construction line command needed for a new MicroStation user - Just swithed over from Autocad to MicroStation 2D

Active Element Class

Looking at the specific method of placement in your screen capture it appears you are wanting to snap to the element but I am unsure which method you might be wanting to use. I am thinking that you might be best using either Near Snap Point or Perpendicular depending on how this snap method might be required.

Effect of Snap Modes

Thank you, Andrew Bell,

In my situation below, I want to draw two lines quickly along line "A" and line "B" quickly in order to determine intersecting point C", how to achieve it in the most efficient way? 

Could you please help to guide me. Thank you in advance.

Assuming you want to place a line FROM that point:

1. Press Place Line
2. Select the AccuDraw
3. Press I (for intersection snap)
4. Tentative Snap one of the lines
5. Tentative snap the other line

If you then left-click, the line will start from the intersection point

Hi Barry Lothian,

Thank you, I followed your guide but not seeing any intersecting point between two line, maybe I didn't understand your guide because I'm a starter in MicroStation.

Could you please be helping me with more detail? Thank you so much.

Hi Barry Lothian,

Thank you, I followed your guide but not seeing any intersecting point between two line, maybe I didn't understand your guide because I'm a starter in MicroStation.

Could you please be helping me with more detail? Thank you so much.

Do you have the tentative assigned to your mouse? I have it set to my mouse wheel button. If not you need to set it in your Button Assignments. To use, I simply press the button once over each line after pressing I or the intersection snap button

Hi Barry Lothian, 

Thank you so much for your help, following your recommendation, I use tentative by mouse and I can do 5 steps above to determine intersection.

One more question, whether MicroStation has the line same Xline of AutoCad, I mean the line with no limited length as same as xline of AutoCad.

No, there is no such feature, even if there were I wouldn’t have any need to use it. I use similar features in GIMP and Inkscape (they call them guides) but that’s only because they don’t have the same functionality as what the AccuDraw provides.

What I would recommend is practice the AccuDraw, learn its key-ins and snap-modes. Eventually you will find there is so much more that you can do without needing construction lines (I personally don’t use the construction class at all). When we are/were all novices, drawing geometry to aid a transform or whatever is what we all did, but when you master the AccuDraw, such temporary geometry is required less and less.

I appreciate your recommendation.

Thank you so much for your help.  

No problem Parker.

Here is a slightly advanced alternative that demonstrates a different use of the AccuDraw to get the same intersection point, but without Intersection Snap:

1. Start Place Line
2. Make sure the AccuDraw is highlighted
3. Tentative Snap to ANYWHERE on the line (I chose the mid-point)
4. Press RE
5. Move the cursor over the line until it rotates parallel with the line
6. Left-Click to accept AccuDraw rotation
7. Press N to make Nearest snap active for 1 Data-point
8. Move the cursor towards the intersection point
9. Press Enter to lock the Axis
10. Tentative Snap to ANYWHERE on the second line
11. Left-click to accept intersection point.