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Relative

Primitives can be placed with respect to another one. The main way to do so is with:

PlaceRelative(ScreenPrimitivePtr A,ScreenPrimitivePtr other,placeX X,placeY Y,scalar paddingX,scalar paddingY)

  • ScreenPrimitivePtr A primitive to place wrt to B
  • ScreenPrimitivePtr other reference Primitive
  • placeX X can be: REL_LEFT, ABS_LEFT, CENTER_X,SAME_X,REL_RIGHT,ABS_RIGHT for example REL_X will place A to the left of B, ABS_RIGHT will place A to the right of the screen
  • placeY Y can be: REL_TOP, ABS_TOP, CENTER_Y,SAME_Y,REL_BOTTOM,ABS_BOTTOM
  • scalar paddingX offset in the opposite direction of the placeX in the x-coord
  • scalar paddingY offset in the opposite direction of the placeY in the x-coord

Dynamic tracking

The relative placement is dynamic, if the reference primitive moves, the placement is updated: 

    show << Latex::Add("I'm A")->at("A");
    show << PlaceBelow(Latex::Add("I follow A"),0.03);

Of course, many wrappers exist over this to simplify stuff for common constructions:

Wrappers:

PlaceNextTo(ScreenPrimitivePtr ptr,int side,scalar paddingx = 0.01,ScreenPrimitivePtr other = nullptr)

side 0 = left, side 1 = right

PlaceBelow(ScreenPrimitivePtr ptr,ScreenPrimitivePtr other,scalar paddingy = 0.01)

PlaceAbove(ScreenPrimitivePtr ptr,ScreenPrimitivePtr other,scalar paddingy = 0.01)

Last primitive inserted

If you don't specify other, then it will use as reference the last screen primitive inserted in the slide. 

show << Title("Relative is better")->at(TOP);
show << PlaceBelow(Latex::Add("sub title"),0.1); // will place below title