# MouseMatics: Mouse Operations in Our Graphing Software

Our graphing calculator and our other graphers, utilizing the most sophisticated **Cartesian** and **polar** coordinate systems, allow you to use your mouse to perform unique operations, as outlined below.

## How to Rotate Axes

Our graphing software is the world's only calculator that allows for **axis rotation**. By **rotating** an axis, you can visualize the graph of a given function, parametric curve, equation, or point set in an **oblique** (non-perpendicular) coordinate system. **Axis rotation** can be achieved either by *entering data* or *using your mouse*.

### Entering data

Click on the **▼** icon at the top right of the canvas, and then enter the angles by which you want to **rotate** an axis and press the **Rotate** button. The axis will **rotate** and the **graphs** will be redrawn to reflect the **rotation**.

### Using your mouse

To **rotate** an axis, hold down the **Alt key** and click on or near the axis. This will select the axis, and its color will change to red. Move the mouse. The selected axis will **rotate** accordingly, and the **graph**s are redrawn to reflect the **rotation** of the axis. Click again with the **Alt key** pressed, to release the axis.

To restore the coordinate system to its normal state press the **Reset** button (if hidden, press the **▼** icon).

## How to Change Scales

To **change the scale** (zoom in one direction), hold down the **ctrl key** and click on an axis. The point that was clicked will be labelled "1" if clicked on the positive side, or "-1" if clicked on the negative side of the axis; it becomes the new unit for that axis.

## How to Translate the Coordinate system

You can **move the coordinate system** in one of the following ways:

- Click on the canvas and drag the mouse; this will translate the origin and the graphs together.
- Double-click on the canvas to
**move the origin** to the location where you clicked; the graphs are updated.