Figure 1.5. Click Types

Pointing with the mouse is not always the most precise way to locate and place objects. For example, pointing on a line edge that is 100 mm long can result in a small but important tolerance error. To avoid such errors, the cursor can aim itself to click on a certain point even if that point is not exactly where the mouse is located.

Reference points for the mouse are selected from a toolbox window, which is activated automatically once you have selected a task that requires precision placement.

Table 1.3. Click Types

	Free Cursor	The mouse clicks at the point where the cursor points. Free Cursor appears as a pointing finger.
	End of Entity	The mouse clicks to the point that is nearest to the End of an Entity the cursor covered at the click time. The cursor appears as a pointing finger.
	Center of Radius	The mouse clicks to the center of the picked arc or circle. The cursor appears as a pointed finger.
	Middle of Entity	The mouse clicks to the point that represents the center of the entity the cursor covered when clicked. The cursor appears as a pointing finger.
	Intersection Point	The mouse clicks to the point nearest the intersection between two entities. This reference point demands two clicks: The first click shows one pointing finger and the second click shows two fingers.
	XY Coordinates	The mouse clicks to the precise coordinates that are entered using the keyboard. Clicking with this option opens a dialog box into which you must enter two values: X and Y. Toggle between the X and Y input fields with the Tab or Shift-Tab keys. Approve this coordinate by pressing OK or CR. Cancel this coordinate with the Cancel button or press Esc.
	Grid Coordinates	The mouse clicks to the grid point closest to the point clicked. The grid must be displayed when using this option. The cursor appears as a pointing finger.
	Delta XY	This option adds a value to the selected point. To open the window, enter values for the X and Y coordinates. Approve this coordinate by pressing OK or CR. Cancel this coordinate with the Cancel button or press Esc. Note By clicking the small triangle, toggle between Delta XY and Delta Polar.
	Delta Polar	This option adds a value to a selected point. To open the Delta Polar window, enter a value for the radius and the angle. Approve this coordinate by pressing OK or CR. Cancel this coordinate with the Cancel button or press Esc. Note By clicking the small triangle, toggle between Delta Polar and Delta XY.
	Pick opposite corners	Use this button for selecting the mid-point between two defined points. This option is very useful for selecting the mid-point of a rectangle.
	Tangent to	Pick this option to create or move a point to be tangent to an existing entity.
	Normal to	Pick this option to create or move a point normal to an existing entity.
	Proximity Click	Use this option to snap the closest point of an object to its nearest entity.
Esc	Cancel	Exit the mouse reference toolbox without changing the cursor type.