Rotation of mosaic images

BioVis3D provides a rotation control, shown in Figure 1, comprised of a center of rotation and four dragging points. The control is similar to that used in the Registration tool, although it is drawn in a different color.

Figure 1: Rotation control.

To rotate images, select a position for the rotation center and then drag any of the dragging points to actually rotate the images. To move the rotation center place the mouse cursor on the center. The  mouse cursor changes to . Click on the center and keep the left button pressed while moving the mouse to drag the center to the desired position (see Figure 2). Once you are satisfied with the center position release the mouse button. Alternatively, right click on the desired position and select Place Rotation Center Here from the context menu.

Figure 2: Movement of rotation control.

To rotate an image, select it by clicking on it. To select more images click on each of them while pressing Shift. The selected images are shown with a surrounding red box as shown in Figure 3. Place the mouse cursor on any of the dragging points of the rotation control. The mouse cursor changes to . Click on the dragging point, (the mouse cursor changes to  ) and keep the left button pressed while moving the mouse to rotate the selected images (see Figure 3). Once you are satisfied with the position, release the mouse button.

Tip: To be more precise, move the mouse away from the rotation center before you release the mouse button. This way you achieve small rotations with relatively large mouse movements.

Instead of using the mouse, make small rotations by using the arrow keys, while keeping the Ctrl key pressed (Ctrl-Arrow Key).

 

Figure 3: Effect of rotating two images of a mosaic.

This tool is usually used in combination with the Transparency and Translation tools.