Use-02: Mouse Panning and Zoom

Mouse Panning and Zoom

Scrolling and zooming the bitmap

When viewing an image zoomed, meaning that the bitmap is bigger than the window and scrollbars are visible, then only a section of the bitmap is visible. To pan the bitmap you can use either the scrollbars or use Mouse Panning:

Click with the mouse somewhere in the picture and hold the left mouse button. Then move the mouse while the button is down. The cursor changes to $images\jpgcrsPan.gif$ and the whole image moves with the mouse and allows you to show quickly invisible parts of the bitmap.

In full screen mode you also can use the cursor keys (<Left>, <Right>, <Up>, <Down>) for panning.

Hint: Mouse Panning is available only when the bitmap zoomed, indicated by visible scrollbars.

You can zoom the display with the mouse wheel: Roll the mouse wheel while holding the <Ctrl> to zoom in and out. The current scale factor is shown in the status bar on the bottom of the window. You also can use the <+> and <-> keys on the numeric keypad for zooming. The æMultiplyÆ key on the numeric keypad resets the scale to 100%. You can also use the keys <F5> to <F8> to reset to a certain scale factor.