Zoom in or out on a whiteboard
This document describes how to zoom the whiteboard being displayed.
Prerequisites
Creat a whiteboard by referring to Create a super board.
Implementation process
The zooming function is enabled by default. The setScaleFactor API can be called to zoom in and out.
Note
If the setToolType is set to Click, the setScaleFactor API is unavailable and the whiteboard cannot be zoomed in or out.
- Call the setOperationMode method to set the operation mode to
ZegoSuperBoardOperationMode.Zoomto enable the zooming function of ZegoSuperBoard. - Set multiple modes using the bitwise OR operator based on your requirements. For example, you can set
Zoom | Drawto support both the zooming and drawing functions.
// Obtain the current subView using superBoardView.
var zegoSuperBoard = ZegoSuperBoardManager.getInstance()
var zegoSuperBoardSubView = zegoSuperBoard.getSuperBoardView().getCurrentSuperBoardSubView();
if (!zegoSuperBoardSubView) return;
// Enable only the zooming function.
// ZegoSuperBoardOperationMode.Zoom = 8
zegoSuperBoardSubView.setOperationMode(8);
// Enable both the drawing and zooming functions.
// ZegoSuperBoardOperationMode.Draw = 4
// ZegoSuperBoardOperationMode.Zoom = 8
zegoSuperBoardSubView.setOperationMode(4|8);
// Zoom in to 200%.
zegoSuperBoardSubView.setScaleFactor(2);Use the following methods to enable the synchronous zooming function to synchronously zoom in and out for all parties.
// Enable the synchronous zooming function.
ZegoSuperBoardManager.getInstance().enableSyncScale(true)
// Enable the function of receiving the synchronous zooming effect.
ZegoSuperBoardManager.getInstance().enableResponseScale(true);