The HTML color model from https://en.wikibooks.org/wiki/LaTeX/Colors#Defining_new_colors shows that \definecolor using a hex color without the leading #. It looks like \color and \textcolor require the user to specify the color model unless using a defined color so our current implementatio...
ellipse->SetLineWidth(3); ellipse->Draw();// Draw a transparent blue text.tex =newTLatex(0.04871059,0.1837649,"This text is transparent"); tex->SetTextColorAlpha(9,0.476); tex->SetTextSize(0.125); tex->SetTextAngle(26.0); tex->Draw(); }...