Ortelius has many subtle methods for fine-tuning your cartographic work. One of these niceties is the point of origin, or center point, around which objects and symbols rotate and snap. Adjusting an object’s point of origin is simple and direct. Here’s how…
Point of Origin
The point of origin of shapes, symbols, grouped objects, and images is represented with a blue “target” originally rendered at the center of the object. To change the point of origin, simply grab onto the blue target and move it to any location within the object’s bounding box.
Object Rotation Pivot Point
The direct rotate knob is represented with a purple handle offset to the right of the object’s center. Simply grab the rotate knob and move to rotate the object. The rotation pivots around the object’s point of origin. To change the point of origin, simply grab it and move it to any location within the object’s bounding box. Object rotation will now pivot around the new point of origin.
Resetting the Bounding Box
After rotating and/or adjusting the point of origin of an object, you can reset the bounding box to perpendicular and return the point of origin to the center of the object. Select the object and choose Graphic > Reset Bounding Box from the main menu. As expected, the object’s appearance does not change, just its bounding box.
Point of Origin on Symbol Adornments
When symbols are created, they retain the point of origin of the original object on which they are based.
Symbols are placed on tracks as a “adornments,” and are snapped to the track at their point of origin. Typically a symbol is centered on the path with its central point of origin. In some circumstances, it may be useful to have a point of origin that is off-center. For example, for floor plans, doors are placed to show the door opening outward from a wall. When placing a door symbol (available in the Ortelius default symbol set) on a wall drawn with a track tool, a door must be offset to one side of the wall. If you look closely at a door symbol while it is not snapped onto a track, you will see this is accomplished with an off-center point of origin.
Before the symbol is created, adjust the point of origin. The symbol retains this point of origin. When snapped to a track, the symbol adornment is offset based on its point of origin. The side of the line the offset symbol appears on is based on the drawing direction of the track. The adornment can later be rotated by right-clicking it and choosing the desired rotation setting from the context menu.