centerM cmds d2m d2mgs displayMmToModel displayMmToModel displayMmToModel displayMmToModelBox displayMmToModelBox distanceM dragging gestureState gestureType lastPt lastPtM MgMotion point point2 point2M pointM pressDrag startCenterM startDistanceM startPt startPt2 startPt2M startPtM switchGesture velocity view

displayMmToModel() [2/3] float MgMotion::displayMmToModel ( float  mm ) const 返回屏幕毫米长度对应的模型长度