This information is for Vicon Evoke 1.6. For up-to-date help, see the latest Evoke documentation.

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In the Graph Plots view, you can control the x- and y-scale of the data plotted by selecting options on the toolbar, in context (right-click) menus, and by dragging with the mouse.

Use the toolbar options for scaling

In the Graph Plots view, the graph plot scaling options in the toolbar enable you to control the type of scaling that is possible and whether or not it is locked to prevent further changes.

 


To prevent any changes to the x-axis (deactivates pan/zoom and fit), select the Lock x-axis button.
When you select the Scale to fit x axis button, the axis range is automatically adjusted to fit the data currently stored in the channel cache (see Graph Plots terminology).
  • When auto-fit is on, the mouse pan/zoom is turned off.
  • Fits to min/max of data range.
To prevent any changes to the y-axis (deactivates pan/zoom and fit), select the Lock y-axis button.
When you select the Scale to fit y axis button, the axis range is automatically adjusted to fit the data currently stored in the channel cache (see Graph Plots terminology).
  • When auto-fit is on, the mouse pan/zoom is turned off.
  • Fits to min/max of data range + 5% padding
Note
When either of the Scale to fit modes is disabled, the graph axes revert back to their previous (non-fitted) state.
This may result in a graph which is not properly scaled and you may need to manually scale or use the context menu to visualize your data again.

An additional option at the bottom right of the Graph Plots view enables you to specify the Live data range.


The Live data range list enables you to choose the default time axis range (ie, x-axis) and, as a result, the amount of data stored in the channel cache (see Graph Plots terminology).
Note that if the duration of the Pause Buffer Size (Advanced parameter in Processing panel > Output section) is less than the Live data range, selecting a new channel source to create an active channel only displays data initially for the duration of the Pause Buffer Size.

This control is not displayed when Evoke is in Review mode.

Use the context menu for scaling

In a Graph Plots view, you can right-click to display a context menu.

The context menu options depend on where the right-click occurred:

Graph Plot



Y-axis



X-axis

 

This table describes the function of each of the options:

OptionFunction
Pin ChannelPins a channel from the current subplot. See Manage channels.
Reset X-AxisResets the range of the time axis. This affects the x-axis range for all plots.
Reset Y-AxisResets the range of the y-axis of the current subplot
Reset All Y-AxesResets the range of all y-axes within the Graph Plot view
Reset All AxesResets the range of both the x- and y- axes for all subplots within the Graph Plot view.

Relative Time Display

The default time index is always relative to the current frame. Clearing this option displays the time relative to the beginning of the current session (for more information on sessions, see Vicon Evoke fundamentals in the Vicon Evoke Reference Guide). 
Note: This option is only available when Evoke is in live mode. When Evoke is in Review mode, the time displayed is always the session time.

Use the mouse for scaling

Graph plots have a range setting (where range is the minimum and maximum value on the axis). Zooming changes the length of the range; panning changes the central point of the range.

The following describes the mouse actions required to zoom or pan a graph plot. For a full list of mouse actions, see Graph Plots mouse actions.

Required zoom or panMouse action
Zoom on a single axis onlyRight-click and drag on the required axis.
Zoom on both the x- and y-axisRight-click within the subplot window and drag the subplot.
Pan on a single axis onlyMiddle-click and drag on the required axis.
Pan on both the x- and y-axisMiddle-click within the subplot window and drag the subplot.
Note that the middle-click can be substituted by the wheel button or by simultaneously pressing both the left and right mouse buttons.

When you zoom or pan, a bold circle is displayed, representing the deadzone. If the mouse pointer is within the deadzone, no zoom or pan change occurs. A faint circle is drawn when the mouse pointer is outside the deadzone, highlighting the current pointer position.


Zoom indicator

Pan indicator

When multiple x-axes are present, zooming or panning one affects all the x-axes (they are linked).

Note
For zooming and panning to work in this way, ensure that neither axis is locked or auto-scaling.
To check, verify that:

  • The Lock axis buttons and the Scale to fit buttons, both horizontal and vertical ), are not selected.
  • Show pan/scale overlay graphics is enabled in Preferences (see Preferences parameters in the Vicon Evoke Reference Guide).