Persistent

Eyeballing positions on the screen can be tedious, hence, you can instead assign a label to a primitive (possibly a different one per slide).

Labeled pritmives can then be selected, with Ctrl+Left Click, and be moved with the mouse and scaled with the mouse roll. The assigned position will by saved for future executions. A selected primitive can be centered horizontally by pressing H and vertically by pressing V.

    show << slope_logo->at("label1");
    show << inNextFrame << slope_logo->at("label2"); // will move from label1 pos to label2 pos

Warning

Labels must be unique, if you set the same label to another primitive, they will share the same position (can be usefull to replace a primitive by another one).