How can I iterate Scroll Layers?

SmartMatrix Shield
1

Hello
On my smartmatrix panel I’m wanting to display some bus information, like this:

 73: Rotherham Intc. - Sheffield Intc. [FSYO]           :
X78: Doncaster Frenchgate Intc. - Sheffield Intc. [FSYO]:
779: Ranmoor Park Road - Robin Hood Road [FSYO]         :
 82: Hall Park Head - Hartington Avenue [FSYO]          :
 20: Sycamore Road - Gaunt Close [FSYO]                 :

As this text is wider than the panel, I am wanting to scroll the text across. I have setup five scroll layers (but only showing one for brevity) like so:

SMARTMATRIX_ALLOCATE_GFX_MONO_LAYER(scrollLayer00, kMatrixWidth, kMatrixHeight, kMatrixWidth * 3, kMatrixHeight, COLOR_DEPTH, kScrollingLayerOptions);

matrix.addLayer(&scrollLayer00);

 const uint8_t scrollSpeed = 18;
 scrollLayer00.setFont(font3x5);
 scrollLayer00.setOffsetFromTop(0);
 scrollLayer00.setMode(wrapForward);
 scrollLayer00.setColor(rgb24(0xFFE0));
 scrollLayer00.setSpeed(scrollSpeed);

And I have scrollLayer01, scrollLayer02, scrollLayer03, scrollLayer04 in addition.

Instead of setting up these layers as above I would like to have them in an array. So I can loop through them. This is so I can avoid code like this:

JsonArray bus = dataChunks[dataIdx].as<JsonArray>();

 uint8_t line = 0;

        makeOutputLine(bus[0]);
        scrollLayer00.setOffsetFromTop((sl)-2);
        scrollLayer00.start(pout, -1);
        if (bus.size() == line) {
            weatherLayer.swapBuffers();
            dataIdx++;
            return;
        }

        line++;
        makeOutputLine(bus[1]);
        scrollLayer01.setOffsetFromTop((sl+=8)-2);
        scrollLayer01.start(pout, -1);
        if (bus.size() == line) {
            weatherLayer.swapBuffers();
            dataIdx++;
            return;
        }
 ...etc...

what would like to do is something like:

    int i =0;
     for (JsonObject b : bus) {
            makeOutputLine(b); // eg: 779: Ranmoor Park Road - Robin Hood Road [FSYO]         :
            scrollLayer[i].setOffsetFromTop((sl+=8)-2);
            scrollLayer[i].start(pout, -1);
            i++;
        }

Can anyone help?
Thanks
Karl.

2

To be able initialize layers as array elements it should has a constructor, that accepts layer parameters at the time of initialization. But you always can initialize layers separately and then organize them to the array of layer pointers.