The angle measurement tool provides an protractor for measuring arbitrary angles on the screen. The tool provides three crosshairs that can be positioned anywhere on the screen. One crosshair is located at the vertex of the angle and the other two crosshairs define the angle. The measured angle is on the same side as the angle bisector line. Both the data window attached to the crosshairs and Meazure’s tool information section will display the angle measurement information. The magnifier window will show the area around the crosshair that is being moved as well as the color of the pixel at the center of the crosshair.

The tool information section displays the following measurements for the Angle tool:

• X1, Y1 - The position of the Point 1 crosshair
• X2, Y2 - The position of the Point 2 crosshair
• XV, YV - The position of the angle vertex crosshair
• A - The angle formed by the lines from the vertex to Point 1 and Point 2. The angle is measured on the side of the tool that contains the angle bisector line. Using the default coordinate system, positive angles are measured clockwise from the Point 1 line to the Point 2 line

The mouse or keyboard can be used to position the crosshairs and fine adjustment can be made with the up/down buttons adjacent to the position text fields. When using the mouse to drag a crosshair, the SHIFT key can be used to lock the motion to the horizontal or vertical direction. In addition, the entire rectangle can be moved by pressing the CTRL key while dragging one of the crosshairs.

To select the Angle tool choose the Angle item on the Tools menu or click on the Angle tool icon on the toolbar.