When a Point Control is selected in the parameters list, the following user interface is displayed:

The Default X and Default Y text fields let you manually enter the initial location of the point within the frame.

The Minimum X, Maximum X, Minimum Y and Maximum Y text fields let you restrict the coordinate of the point to the given range. To allow the user to only position the point within the frame, set both minimum values to 0 and both maximum values to 1. Leave a field empty if you do not with to restrict the coordinate in that particular direction.

The Map coordinates to option lets you control how the point coordinates will be converted when fed to the Quartz composition inputs:

• Choose Pixel-based values if the coordinates are to be used by a Core Image filter patch (such as a Zoom Blur).
• 
Choose Quartz Composer coordinate system if the coordinates are to be used by one of the other Quartz Composer patches.

The Compensate for Frame Margin parameter lets you control the coordinates that will be fed to your composition when the output frame is larger than the input frame. Filters running in Motion and After Effects allow users to add a Frame Margin around the source to make room for any pixels “splilled” by the effect. When this option is enabled, the coordinate will be relative to the original image location. When this option is disabled, coordinates are expressed in relation to the size of the enlarged frame. This option is only available when the Map coordinates to option is set to “Pixel-based values”.

The On-screen control size option lets you assign a custom size to the on-screen controls available in Final Cut Pro X and Motion 5. The default value is recommended for all situations except dividers (discussed below).

The Display parameter name option lets you control whether the point parameter is labeled when the user moves the mouse over the on-screen control. The default behavior can be refined via the next option, named …only when mouse is above point. Disable the latter option if you wish point controls to always be labeled in the canvas.

The Speed up/slow down mouse by option lets you control how fast the point parameter location is updated on screen. By default, the speed is only changed when the shift key is down, and it is slowed down by 0.5 (50%). Disable the …only when Shift key is down option to change the speed under all circumstances.

The Constrain location to popup menu lets you choose among the following options:

• Any direction: the user can move the point parameter anywhere on the canvas (but within the range defined above, if there is any.)
• Horizontal axis / Vertical axis the user can only move the point over the X or Y axes. Then this option is selected, an additional popup menu named Divider lets you control the appearance of the point parameter:
  • None: continue to display the point parameter with a round-shape even if the location is restricted to a particular axis.
  • Thin divider with point control: a thin divider line is drawn on-screen, along the fixed axis. The standard, round-shaped point control is still displayed, and it is the only way the user can reposition the point.
  • Thick divider without point control: a divider is the only way the user can reposition the point. No round-shaped indicators are drawn on screen. The thickness of the divider is determined by the value set above, in the On-screen control size text field.
• Distance from initial location: the user can only reposition the point within a given distance from its initial location. When this option is selected, and additional text field named Maximum distance lets you specify this value, measured as a percentage of the frame width. For example, a value of 0.05 means that the point will be allowed to be repositioned no more than 5% away from its initial location in the frame.