rudolfninja's profile - activity

Hi guys, I have arc parameters from Autocad file and I need to draw it using opencv. However, using corresponding parameters in cv::ellipse function the arc is absolutely not the same as in Autocad. Here is my code:

cv::ellipse(image, center, cv::Size(radius, radius), angle, start_angle, end_angle, cv::Scalar(255, 255, 255));

The picture should be like

but in fact I've got

Here is parameters for every arc:

1) center.x = 495.419403
    center.y = 527.065674
    start angle = 0.0000
    end abgle = 56.88228
    full angle = 56.88228
    start.x = 501.41940
    start.y = 527.06567
    end.x = 498.69757
    end.y = 532.090979
    arc_center.x = 500.695245
    arc_center.y = 529.92321
    radius = 6.00000

2) center.x = 495.4194
    center.y = 486.31543
    start angle = 270.0000
    end abgle = 0.0000
    full angle = 90.0000
    start.x = 495.41940
    start.y = 480.31543
    end.x = 501.4194
    end.y = 486.31543
    arc_center.x = 499.6620
    arc_center.y = 482.07279
    radius = 6.00000

3) center.x = 454.6691
    center.y = 486.31543
    start angle = 213.11771
    end abgle = 270.000
    full angle = 56.88228
    start.x = 449.64386
    start.y = 483.03727
    end.x = 454.66916
    end.y = 480.31543
    arc_center.x = 451.8116
    arc_center.y = 481.03959
    radius = 6.00000

4) center.x = 419.4194
    center.y = 562.31543
    start angle = 56.88228
    end abgle = 213.1177
    full angle = 156.2354
    start.x = 429.2539
    start.y = 577.3913
    end.x = 404.3435
    end.y = 552.4809415
    arc_center.x = 406.69148
    arc_center.y = 575.04336
    radius = 18.00000

How can I draw correct arcs? I've got start and end points of the arc, radius, and center points (arc center and center from where radius goes)

flipping change the position of the other points. But actually, it is not so importatnt for me.I still don't understand

I've added additional check: end_angle = end_angle == 0.0 ? 360.0 : end_angle; and it solved the problem with red arc an

You've got end_angle and start angle. So you can calc full_angle. That waht I do. But looks like when use 0, it looks al

Why do you use angle with 0.0 value but not full angle (end angle - start angle)? This is the difference in my code

Degrees. I can't provide full code because it uses 3rd partylibraries to work with autocad file. So you won't be able to

I updated my post with required info. Looks like the problem might be somewhere in that, that autocad coordinates start

I updated my post with required info. Looks like the problem might be somewhere in that, that autocad coordinates start

I updated my post with required info

Drawing an arc Hi guys, I have arc parameters from Autocad file and I need to draw it using opencv. However, using corre

Drawing an arc Hi guys, I have arc parameters from Autocad file and I need to draw it using opencv. However, using corre