The rectangle measurement tool allows you to position two crosshairs anywhere on the screen and measure the enclosing rectangle. In addition, the screen area bounded the rectangle can be captured to the clipboard. Both the data window attached to the crosshairs and Meazure’s tool information section will display the rectangle 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 Rectangle tool:

• X1, Y1 - The position of the Point 1 crosshair
• X2, Y2 - The position of the Point 2 crosshair
• W, H - The width and height of the rectangle. W = |X2 - X1| + 1, H = |Y2 - Y1| + 1
• D - The length of the diagonal. D = sqrt(W² + H²)
• A - The angle of the diagonal relative to the x-axis. Using the default coordinate system, positive angles are measured clockwise from the positive x-axis to the line from Point 1 to Point 2
• Ar - The area of the rectangle. Ar = (W * H)

Note that the calculation of W, H, D and Ar is always performed in pixel units and the result is converted to the currently selected display units.

To capture the screen area bounded by the rectangle to the clipboard, select the Copy Region item from the Edit menu or press Ctrl+R.

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 Rectangle tool choose the Rectangle item on the Tools menu or click on the Rectangle tool icon on the toolbar.