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Diffstat (limited to 'examples/custominput/doc/src/custominput.qdoc')
| -rw-r--r-- | examples/custominput/doc/src/custominput.qdoc | 44 |
1 files changed, 42 insertions, 2 deletions
diff --git a/examples/custominput/doc/src/custominput.qdoc b/examples/custominput/doc/src/custominput.qdoc index 69333d96..9bb5607f 100644 --- a/examples/custominput/doc/src/custominput.qdoc +++ b/examples/custominput/doc/src/custominput.qdoc @@ -22,9 +22,49 @@ \ingroup qtdatavisualization_examples \brief Implementing custom input handler in a widget application. - TBD... + The Custom Input example shows how to customize the 3D graph controls in a widget application using a custom graph input handler to capture and process mouse events. + The code in this example shows also how the camera is controlled by using QPropertyAnimation to animate the camera and item selection + is done on mouseover rather than clicking any mouse buttons. Also the code shows how to implement similar zoom with mouse wheel functionality as the default + input handler implements. \image custominput-example.png - TBD... + \section1 Replacing default input handling + + The default input handling mechanism is replaced by setting the active input handler of \l Q3DScatter + to \c CustomInputHandler that implements the custom behavior. + + \snippet ../examples/custominput/scatterdatamodifier.cpp 0 + + \section1 Implementing custom selection handling + + The on mouseover selection handling is implemented in the \c CustomInputHandler that captures the mouse events. + It then stores the last known coordinates to the \l QAbstract3DInputHandler::inputPosition property. + + \snippet ../examples/custominput/custominputhandler.cpp 0 + + As the selection is one shot, and is cleared each time a 3D frame is rendered, a timer is setup to retrigger selection so that the selection moves to the item + currently under the mouse cursor as the camera animates around the graph even when the mouse cursor is not moving. + + \snippet ../examples/custominput/scatterdatamodifier.cpp 1 + + \section1 Implementing custom zoom handling + + The camera has a zoom factor that represents amount of zoom in percentages. In this example the zoom range is limited + between 10% and 500%. This range is then divided to four subranges where \c angleDelta is scaled to different amount of zoom change + based on the current subrange. + + \snippet ../examples/custominput/custominputhandler.cpp 1 + + \section1 Implementing custom camera handling + + The camera is animated to constantly rotate around the graph with two animations. The rotation around the graph is done with + a simple QPropertyAnimation that just increments during 20 seconds from 0 degrees to 360 degrees and sets the \l Q3DCamera::xRotation property. + + \snippet ../examples/custominput/scatterdatamodifier.cpp 2 + + The camera movement up and down is implemented with a QSequentialAnimationGroup that varies the \l Q3DCamera::yRotation property of the camera + from 5 degrees to 45 degrees and back with in and out easing. + + \snippet ../examples/custominput/scatterdatamodifier.cpp 3 */ |