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The Maths Helper Plus scales tool bar is shown below:

These tool bar buttons have the following functions:

 Scale presets: Click one of these buttons and a preset scale is applied to the graph area immediately. Everything in the 'Grid lines' and 'Graph Scale' tabs of the graph area dialog box are included. This means that the graph size, position and appearance are also loaded. Keyboard shortcuts: Ctrl+1, Ctrl+2, Ctrl+3, Ctrl+4 Scale snapshot: Click this camera button, then one of the scale preset buttons to save a snapshot of the graph area scale, position and grid line settings. Keyboard shortcuts: Ctrl+Shift+1, Ctrl+Shift+2, Ctrl+Shift+3, Ctrl+Shift+4 Tip: It is useful to store your most commonly used graph area settings in presets 1, 2, and 3. Use preset 4 as a 'book mark' to save settings so that you can quickly get back where you were. Zoom in: The graph scales decrease by 50% and the graph moves outwards in all directions. Keyboard shortcut: F10 Zoom out: The graph scales increase by 50% and the graph moves inwards in all directions. Keyboard shortcut: Shift+F10 Zoom 'x' in: The 'x' scale of the graph decreases by 50% and the graph moves outwards in the 'x' direction. Keyboard shortcut: Ctrl+Right keyboard arrow key Zoom 'x' out: The 'x' scale of the graph increases by 50% and the graph moves inwards in the 'x' direction. Keyboard shortcut: Ctrl+Left keyboard arrow key Zoom 'y' in: The 'y' scale of the graph decreases by 50% and the graph moves outwards in the 'y' direction. Keyboard shortcut: Ctrl+Up keyboard arrow key Zoom 'y' out: The 'y' scale of the graph increases by 50% and the graph moves inwards in the 'y' direction. Keyboard shortcut: Ctrl+Down keyboard arrow key Box zoom: This button activates the box zoom tool, which allows you to frame a rectangular region on the graph area, then set the graph scale to match the frame.

## Panning:

'Panning' is where the graph area seems to move over the underlying graph so that you can see different parts of it.

Keyboard method: To pan the graph area in any direction, hold down a 'Ctrl' and a 'Shift' key, then use the keyboard arrow keys to pan in any direction.

Mouse method: Hold down a 'Ctrl' key, and drag the graph area in any direction with the mouse.

## Graph Area dialog methods:

The 'Graph Scale' tab of the graph area dialog box allows you to type in any scale for the 'x' and 'y' axes.

Press the F8 key to display the graph area dialog box. Choose the 'Graph Scale' tab and set the required scales.