pwuertz/qmlplotting

A collection of QtQuick items for basic data visialization.

qmlplotting's Issues

CLANG: Compilation fails with variable length array

Hi Peter,
compilation with Clang of paintPolygon fails, because you are using a variable length array called points
in the paintPolygon() function:

static void paintPolygon(QImage& img, int segments, bool border) {
    int size = img.width();
    QPainter p(&img);
    if (!border) p.setPen(Qt::NoPen);
    p.setBrush(QColor(Qt::white));

    if (segments) {
        QPointF points[segments];

As far as I understand, Clang C++ 11 supports just POD type vaiable length arrays.
The recommendation is to use a Vector in case variable lengh is needed.

Could you please tell me what compiler you are using ?
I am using the latest Mac Yosemite toolchain.

Thanks,
Thomas

Need some direction porting to QT6

I was wondering what your general thoughts are on where to start porting this to QT6. My thought right now is to try and rewrite it to not use the OpenGL specific classes. I am also running into issues with the materialshaders which api has been changed quite a lot. What would you recommend as an approach?

GLSL version 130 is not supported on OSX with legacy profile

Hi Peter,

I tried to run you test examples, but I do get this error:

QOpenGLShader::compile(Fragment): ERROR: 0:1: '' :  version '130' is not supported

This seems to be connected to the OSX running in Legacy Profile, which only supports GLSL up to 1.20.
The Core Profile would have to be activated.
On this Apple page you can switch between Legacy and Core profile:
https://developer.apple.com/opengl/capabilities/GLInfo_1090.html

Core profile can be activated in Qt:
https://wiki.qt.io/How_to_use_OpenGL_Core_Profile_with_Qt

For fun I have reverted GLSL 1.20 in your code and the plots are much better, but the GLSL syntax has changed, so it is no solution.

Run the feature deprecation list on page 2 of the GLSL 1.30 spec backwards:

#version 130 -> #version 120
in -> attribute
out -> varying
Remove fragColor declaration, replace fragColor usage with gl_FragColor

I do not know anything about openGL or GLSL, so I have no idea what to do now.
Do you have any simple solution ?

BR,
Thomas