Add support for drawing spline line with control points

[asmwarrior]

Hi, from your source code, I see you just skip the spline with control points. You only support the spline with fitpoints. So, my question is: can you support the spline with control points.

Under wxWidgets, I see there is a function named: DrawSpline, which you only need to supply all the points of the spline, you can have a look at this sample code from: Device contexts in wxWidgets, the last image of this page shows a spline.

Any suggestions? Thanks.

[JamesBremner]

The documentation for the wxWidgets DrawSpline method ( https://docs.wxwidgets.org/3.0/classwx_d_c.html#ad72d38c75ac6b3f80c1f957dd94089fa ) says:

Draws a spline between all given points using the current pen.

This suggests to me that it uses fit points. What makes you think it uses control points? Have you tried it?

[asmwarrior]

Hi, I already tested it by using the code snippet(the last code snippet in that web page) I mentioned in my first post: Device contexts in wxWidgets

    dc.DrawSpline(4, splines);
    dc.SetPen(wxPen(*wxBLUE, 5, wxSOLID));
    for (int i = 0; i<4; i++)
    {
        dc.DrawLine(splines[i].x, splines[i].y,splines[i].x, splines[i].y);
    }

You can see the spline is not go through the second and third points. So, my conclution is that the wxWidgets' DrawSpline method is using the control point.

[asmwarrior]

Oh, I just notice that you have pushed new code Display control point splines as simplified "linear" Beziers to implement this feature.

[asmwarrior]

Tested, and it works fine! Great! I think this issue(feature request) is implemented. Thanks.