Target Positioning Viewers: Measuring Distances and Angles

Projected distances and angles can be measured in the Target Positioning Viewers. This can be done using the Measure Distance () and Measure Angle () tool buttons.

To measure the distance between two points, select the () button and position the mouse at a starting point and click. A line appears and follows the cursor until the mouse is clicked again. The distance is shown in a box located in the upper portion of the viewer.

To measure an angle, select the () button and click the mouse at two points to provide a reference line. The reference line is then shown, as is a second line extending to the cursor. The angle is shown in a box located in the upper portion of the viewer.

Key Points of target components (e.g., top, bottom, and centroid of a cylinder; corners of a rectangle, etc.) can be displayed and picked in the Target Positioning Viewers. When picking two Key Points, their absolute positions and the distances between the points can be readily displayed.

To view the Key Point positions for target components, select the Show Key Points tool button ().

• To get the distance between any two Key Points, select them with the mouse, and then with the right mouse button, select Show Distances. (When key points are picked, their color changes from yellow to red.)
• To hide the Key Points, select the Mouse Pointer button.
• To reset the Key Points so that none are selected, press the Key Points button.
• The size of the Key Points rendered in the viewer can be adjusted using the Set | Key Points Size menu item in the viewer.

The distances between two Key Points are shown in a widget (see below). The following information is displayed:

• Position of first picked point: r-, q-, and j-position in Target Chamber coordinate system.
• Position of second picked point: r-, q-, and j-position in Target Chamber coordinate system.
• The actual distance (dx, dy, dz, and total distance) between the two points in the Target Chamber coordinate system.
• For each view (2 for OMEGA and OMEGA-EP, 4 for NIF, 6 for LMJ), the projected distance (dx, dy, and total distance) between the two points in the view.

Next