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 primitives can be selected with Ctrl+Left Click, then moved with the mouse and scaled with the mouse wheel. While you drag, light-blue guides appear and snap the primitive's edges and center to the other primitives of the slide, so you can align elements precisely. A selected primitive can also be centered horizontally by pressing H and vertically by pressing V.

Several primitives can also be moved as a group: toggle them in and out of the selection with Ctrl+Shift+Left Click (they highlight without moving), then drag with the left button to translate them all, preserving their relative spacing. A short click clears the selection.

Dragged positions are kept only for the current session until you save them: press Ctrl+S to write them to disk so they are restored on the next run. If you try to quit (Esc) with unsaved placements, Slope asks for confirmation first.

    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).