The ViewPortHandler

The ViewPortHandler class is responsible for handling the view-port of the chart. This means it's responsible for what is visible in the chart-view, it's current state in terms of translation and zoom / scale level, the size of the chart and it's drawing area and current offsets. The ViewPortHandler allows to directly access all the above mentioned properties and modify them.

Getting an instance

An instance of the ViewPortHandler can be acquired the following way:

ViewPortHandler handler = chart.getViewPortHandler();

Scale & Translation

• getScaleX(): Returns the current scale / zoom level on the x-axis.
• getScaleY(): Returns the current scale / zoom level on the y-axis.
• getTransX(): Returns the current translation (movement) on the x-axis.
• getTransY(): Returns the current translation (movement) on the y-axis.

Chart dimensions

• getContentRect(): Returns the current content area as a RectF object. // and many more ...