dirty scroll text for adafruit gfx

scrolltext.cpp

void scrollString(String str) {
    int yoff = 1;
    display.clearDisplay();
    display.setTextWrap(false);  // we don't wrap text so it scrolls nicely
    display.setTextSize(2);
    display.setRotation(0);
    int charWidth = 12; // textsize 2 @todo auto calculate charwidth from font
    int pxwidth = (str.length()*charWidth)+32; // @todo get actual string pixel length, add support to gfx if needed
    for (int32_t x=charWidth; x>=-pxwidth; x--) {
        display.clearDisplay();
        display.setCursor(x,yoff);
        // Serial.println((String)x);
        // display.print("ABCDEFGHIJKLMNONPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz_0123456789");
        display.print(str);
        // delay(ANIMSPEED/2);
        delay(150);
    }
    Serial.println("done");
}

I think this works, I just whipped it togather, I usually just whip together scrolling code for different displays, I need to make an actual library function or class to reuse to take in env info, speed, scroll behaviors loop, multiple directions, start from offscreen (pad left), start from 0, and auto determine the sizes. There are probably better implementations of scrolling using gfx and a matrix using actual canvas matrices